nastran error list

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Current Update: Jan 14, 2011

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This section includes a description of all known errors and general limitations in all releases of MSC.Nastran and MD Nastran. The "version is the version on the f06 title page". Recent versions are sometimes referred to by the CD id as follows: MSC.Nastran 2005R3 = 2005.5.0 MSC.Nastran 2005R3b = 20005.5.2 MD Nastran R1 = 2006.0.0 MD Nastran R2 = 2007.0.0 MSC.Nastran 2007r1 = 2007.0.0 MD Nastran R2.1 = 2007.1.0 MD Nastran R3 = 2008.0.0 MD Nastran 2010 = 2010.1.0 MD Nastran 2010.1.1 = 2010.1.1 MD_MSC Nastran 2010.1.3 = 2010.1.3

If the Version = "GL" then this indicates a General Limitation which indicates a fix is not planned.

Continuous updates to the error list are available to MD Nastran / MSC Nastran clients on the MSC SimCompanion web page

http://simcompanion.mscsoftware.com/infocenter/index?page=content&id=KI8008006 The MSC Support pages can also be used to search for keywords to easily locate individual errors - http://simcompanion.mscsoftware.com

Known Error CR 399

Product MSC / MD Nastran Corrected Version 70.5

Abstract Eigenvalue Analysis - CEAD, QRG - Unexpected Normalization

Description

Complex eigenvalue analysis with the inverse power method of eigenvalue extraction will always normalize to MAX. POINT normalization requests are ignored. The Version 70.5 Quick Reference Guide has been updated to indicate

that point normalization is only available for the det method. Known Error CR 785

Product MSC / MD Nastran Corrected Version 69

Abstract MSGMESH, MSGSTRESS, MSGVIEW - MSGMESH, DIAG 29 - Infinite CPU Loop

Description

If MSGMESH is used with the link specification update feature, an infinite loop occurs. An infinite loop no longer occurs; UFM 53 will be issued indicating

an incorrect format for the mesh entries. Known Error CR 868

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Description

STRESS(PUNCH) will not properly output the HEXA, PENTA, BEND, BEAM, TRIA6,

or QUAD8 elements. Element margins of safety (ROD, CONROD, TUBE, and BAR

elements) will produce poor punched formats if stress allowables are not given on the referenced MATi entries.

Product MSC / MD Nastran Corrected Version GL

Abstract Grid Point Force - GPFDR - UFM 3008

Description

The open core requirement for the GPFDR module can be as large as (6 X BUFFSIZE + 14 X number of grids) if the grids use a nonrectangular displacement

coordinate system. For problems in basic coordinates, the grid requirement drops to 8 X number of grids.

Abstract Dynamic Response - TRD, TRD1, FRRD, FRR - UFM 3005

Description

If the MGIV method of real eigenvalue extraction computes modes for massless DOF with uncoupled stiffness

terms, the eigenvalue is large (1.E+35) as it should be, but the generalized stiffness is 0.0 (it should also be

1.E+35). Null eigenvectors may be produced.

An avoidance is to use PARAM,HFREQ or PARAM,LMODES to discard these bad modes in dynamics.

Abstract Aeroelastic Analysis - GI - Poor Accuracy

Description

The linear splines used to connect structural and aerodynamic degrees of freedom are sensitive to modeling techniques, particularly on short-word machines. This included all machines except CRAY, CDC and NEC. It is good practice to have the spline axis coincide with the structural grid points, and to avoid discontinuities in the lines joining structural grid points by using separate splines on each side of the discontinuity.

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Abstract Dynamic Response - VDR - No Output

Description

If an OUTPUT(XYPLOT) command is in case control, but there are no other XYPLOT commands, all printed output requests are ignored.

An avoidance is to put in XYPLOT requests or remove the OUTPUT(XYPLOT) command.

Abstract Elements - QUAD4,TRIA3 - Wrong Answers

Description

When the MID4 option of the PSHELL card is used to simulate offset of the element centerline from the grid

point plane, the element is somewhat too stiff. The error increases with the ratio of offset to element width.

An avoidance is to use RBAR elements to model the offsets . Known Error CR 1712

Abstract Frequency Response Analysis - RANDOM - SWM 3002, UWM 979

Description

If a non-existent point is referenced in an output request when there are multiple subcases, the RANDOM module will cease processing at that point and issue SYSTEM WARNING MESSAGE 3002. The following user warning message

is now issued:

0*** USER WARNING MESSAGE 979, AN XY-OUTPUT REQUEST FOR POINT OR ELEMENT

ID 2000

-ACCE- CURVE IS BEING PASSED OVER. THE ID COULD NOT BE FOUND IN DATA

BLOCK 102

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Abstract Grid Point Stress - Preface - UFM 603

Description

If the SURFACE Case Control card has a continuation card, and the first words that appear on this card are

OUTPUT SYSTEM, the error occurs.

An avoidance is to start the continuation with another word. Known Error CR 1739

Abstract DMAP - DIAG 4 - Addressing ERROR

Description

If DIAG 4 is used on restart, the program may exit abnormally at the start of the run.

The DIAG 4 cross reference output for Label Names will be incorrect if no labels exist in the DMAP, and the

parameter section of the cross reference will not contain any parameters although parameters are present.

An avoidance is to put a label in the DMAP. Known Error CR 1758

Abstract Cyclic Symmetry - Restarts - Various

Description

In superelement static cyclic symmetry (SOL 81), some restart paths do not function well. The following

restart paths have been demonstrated to work, using the indicated input and DMAP Alters. Other types of

restarts can be made, using these techniques. A. Conventional Superelement Restarts.

Use the same techniques applicable to noncyclic symmetry superelement analysis.

1. Exit during Phase I.

2. Structural Changes in a Superelement. 3. Load Change Restart

B. Time Limit in a Harmonic Loop SET N = 0, residual only

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SEMG = N

PARAM,RESDUAL,-1 (bulk data)

Input all bulk data, or use PARAM,NODATA,-1 and delete all the bulk data except PARAM entries.

C. Loads Change in One Tip Superelement, Same Number of Loading Conditions,

Sam Known Error CR 1759

Abstract Plotting - RF24D20, Superelement - Wrong Labels

Description

If SPC labels at grid points are requested for plotting ("GSPC") and resequencing is requested, the SPC labels are attached to the wrong components.

An avoidance is to make a separate run for these plots without resequencing,

and insert an EXIT after the RFAlter, or not request the SEKR operation in superelements.

Abstract Cyclic Symmetry - CYCLIC2 - UFM 3005, UFM 4319, UWM 4359

Description

There are two errors related to the use of the CYSUP Bulk Data entry when rotational symmetry is applied to a model with three or more segments. 1. If the rigid body rotations are to be supported, but there exists no stiffness at the components specified on the CYSUP entry, then UFM 3005 may be issued. But, if components 4 and 5 (out-of-plane rotations) are then constrained by an SPCi card or a GRID card, in order to avoid UFM 3005,

then UFM 4319 will be issued.

For components 4 and 5, an avoidance of UFM 4319 is to define rotational springs to ground (e.g., CELAS2).

For component 6 (in-plane rotation), an avoidance of UFM 3005 is to apply a single-point constraint (e.g., SPCi), which is contrary to Remark 1 under the CYSUP Bulk Data entry description.

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Abstract Plotting - PLOT - SFM 4276

Description If modern plate elements are present, and SHRINK or DIAG 34 are requested,

the error may occur. Known Error CR 1802

Abstract Miscellaneous - Preface - CPU Loop

Description

If the THRU range on an input card is larger than 131,071 for CDC/7600 and CYBER computers, or 8,388,608 for

CRAY computers, the error may occur. It has been observed on a PLOAD2 card

with a larger range. (Cyber,CDC 7600,CRAY only)

An avoidance is to split the THRU range into smaller sets, so that none exceeds the limit.

Abstract Elements - PQUAD4 - UFM 2010

Description

If both PQUAD4 and PSHELL (and/or PCOMP) cards exist in the same deck, the misleading message references

PSHELL cards. The PQUAD4 card is obsolete, and is removed from current documentation. It should be replaced with

the PSHELL card. The PQUAD4 card will be deleted from the code on a future system.

An avoidance is to replace PQUAD4 card with PSHELL cards wherever they exist as they cause various confusing

errors. Known Error CR 1804

Abstract Superelements - SELA - Wrong Answers Description

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For large problems, if the first several upstream load vectors are null, the remaining upstream load vectors

may be ignored. This can be detected with DIAG 20.

An avoidance is to place a token load on all upstream superelements. Known Error CR 1805

Abstract Elements - PCOMP - Wrong Answers

Description For layered composite materials with an unsymmetric layup, the generated transverse shear matrix MID3 is

incorrect. Known Error CR 1806

Abstract Database - LOAD/UNLOAD - Wrong Answers

Description

If a database is unloaded to a sequential file using the DBMGR //3 command, then restored to a direct access

file using the load command, any keywords stored in the database dictionary will be lost. Most keywords are only

for diagnostic use (i.e., "SEMGDONE"), and will cause no further errors. The one exception at present is the

keyword "NOSETRUE", which appears when all grid points are in the residual structure. This will cause the fatal

message above on PARAM,NODATA or PARAM,DLOAD restarts. An avoidance is to use the following alter for this type of restart: ALTER 10 $ MSC/61B, AFTER DBMGR //11

SETVAL //V,N,NOSE/-1 $ Known Error CR 1807

Abstract Matrix Methods - FBS, Method 2 - Wrong Answers

Description

If a passive group appears within the first 20 columns of a matrix,

some terms may be dropped. The error was first observed on a large static reduction.

An avoidance is to block Method 2 by using the NASTRAN card entry FBSOPT=-1,

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when passive columns occur. Known Error CR 1808

Abstract Database - DBSTORE - DBM 288

Description

This error occurs when more than 32,768 GINO blocks are stored in a single database, and a store of an

equivalenced file is attempted. (IBM only)

An avoidance is to use several databases, none larger than 32,000 GINO blocks.

Abstract Heat Transfer - HBDY - Wrong Answers

Description SOL 74 gives wrong answers for nonlinear HBDY types AREA3 and AREA4. An avoidance is to use the POINT option instead.

Abstract Elements - Midside Nodes - Wrong Answers

Description

The QUAD8, TRIA6, and HBDY elements use an incorrect average temperature

for material properties when the

number of active grid points is not the same for all elements of the same type. (Deleted midside grid points are

not active grid points; all connected grid points are active.)

An avoidance is to delete the same number of nodes on all elements of the same type in the model.

Abstract Dynamic Response - SDR3 - UFM 4605 Description

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set is empty, USER FATAL MESSAGE 4605 occurs.

An avoidance is to remove output requests for empty sets. Known Error CR 1812

Abstract Miscellaneous - Multiple Runs - ITRENT 1111

Description If two or more MSC/NASTRAN executions are made in the same job, the error may occur. (Univac only)

An avoidance is to submit each run as a separate job. Known Error CR 1813

Product MSC / MD Nastran Corrected Version

Abstract Response Spectra - PARAM,RSPECTRA,0 - Wrong Answers

Description

The response spectra option provided in transient analysis gives wrong answers

for acceleration spectra at high frequencies. The peak accelerations for high frequency oscillators will not match the results of a transient analysis where a stiff spring and small mass have been attached to the structure to directly represent the oscillator. The displacement and velocity from the response spectra results will match those of the oscillator represented with spring and mass.

Avoidance: The user should set the value of delta t on the TSTEP input such that 10 time steps occur during one cycle of oscillation for the highest frequency of interest.

Abstract Matrix Methods - MPYAD - Overflow

Description

If incompatible matrices are input to the MPYAD module, and one is of form 3, an unclear diagnostic results.

A good practice is not to input form 3 matrices to MPYAD, as this capability will be removed in a future

system. The form 3 matrix [A] can be changed to form 6 by the following steps:

ADD A, /A6 $ ADD WILL GENERATE PROPER MATRIX EQUIV A6,A/ALWAYS $ A6 REPLACES A

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Abstract Dynamic Response - XYPUNCH - Missing Output

Description

The PCHRESP parameter described on p. 4.3-23 (2/15/82) of the MSC/NASTRAN

User's Manual is not implemented.

The function it was to perform (punch TABLED1 cards based on output data) can be performed with a DMAP Alter.

Delete the XYTRAN module statements, and replace them with an identical statement except for the sixth parameter.

Set it to S,Y,PCHRESP=0. (MSC/62 only) Known Error CR 1816

Abstract Material Nonlinearity - SOL 66 - Wrong Answers

Description

If the large displacement option is used, and more than one rotation is enforced at a grid point with SPCD

cards, the transformations are incorrect when increments are specified on the NLPARM card.

An avoidance is to use separate subcases, each with a single increment, rather than many increments on a

single subcase. (MSC/62 only) Known Error CR 1817

Abstract Transient Response - TRD1 - UFM 3050

Description

If an IC card is selected in case control in SOL 31, which is illegal, the wrong fatal message ("insufficient

time") is printed. The correct text can be found under UFM 3051, listed in Section 6 of the U.M.

Abstract Elements - EMG - EMGPOM Description

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is insufficient memory available, unclear

diagnostics may result. (IBM, Cyber, CDC/7600, CRAY, Univac only) An avoidance is to request more memory.

Abstract Database - DBSTORE - SFM 4167

Description

The maximum number of database dictionary entries is influenced by the fourth input parameter for the DBMGR

command when creating the database. The default value will almost always result in more than one GINO block being

used for the dictionary. If the dictionary has only one block, the database will be unusable. (Univac only)

An avoidance is to insure that the dictionary is assigned more than one block. This can be determined from

SIM 4162, under the "WRITTEN" entry. This number should be greater than 1 when the database is created. If it is

not, increase the fourth input parameter to at least twice the value printed under the "NUMBER OF ENTRIES -

MAXIMUM" for SIM 4162. Known Error CR 1821

Abstract Superelements - Documentation - Wrong Answers

Description

The DMAP Alter described in the Application Note of January 1982 titled "Inertia Relief in Superelement

Analysis" has a typographical error that causes inertia loads of the wrong sign. The second to last statement on

page 7 should be changed from SOLVE QRR,QR/CRX/ $ etc. to

SOLVE QRR,QR/CRX//-1 $

Update pages for the application note will be delivered with the next newsletter.

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Description

In SOL 66, the values output for transverse shear forces for the QUAD4 and TRIA3 elements are incorrect if

MID3 (field 7 on the PSHELL card) is nonzero. An avoidance is to leave MID3 blank.

Abstract Miscellaneous - 1VARY - UFM, CARD TO VARY NOT FOUND Description

Multiple 1VARY cards for the same type of data card may not sort correctly. Known Error CR 1824

Abstract Matrix Routines - Method 3 - Various GINO Messages

Description

If Method 3 matrix multiplication is selected, and there is not sufficient memory available, various system

errors may occur. The method selected can be determined by DIAG 19. Avoidances are to increase memory, or block Method 3.

Abstract Elements - Punched Output - Extra Output

Description If output is requested in punched format, elements whose printed formats include more than one element per

line will also print the last few elements, if they do not fill the line. Known Error CR 1826

Abstract Cyclic Symmetry - SOL 77 - Parameter Print

Description

If illegal loads are requested in buckling analysis using cyclic symmetry, the program branches from the

CYCLIC1 module to the PRTPARM module, then prints all parameters. This condition can be detected by noting that parameter GEOM3C has the value

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minus one. One such case was observed when GRAV entries were selected. This user error now results in a meaningful fatal message:

0*** USER FATAL MESSAGE 4342,

THE LOAD BULK DATA CARD GIVEN BELOW IS INCONSISTENT WITH SPECIFIED

ANALYSIS HARMONICS OR SEGMENTS OR SYMMETRY TYPE.

An avoidance is to check the load entry types against the limitations described in Section 3.2 of the Application Manual. Known Error CR 1827 Product MSC / MD Nastran Corrected Version 66

Abstract Grid Point Stress - Branched Surface - Wrong Answers

Description

When requesting stresses for a surface with branches using geometric interpolation without a value for

tolerance, some stresses at branch points may be incorrect. An avoidance is to use the BRANCH option.

Abstract Heat Transfer - CFTUBE - Wrong Answers

Description

If the CFTUBE is used in SOLs 24, 61, or 62, which is illegal, SOL 24 produces wrong answers, and the others

fatal error message GETSTB ERROR CODE 1604 or some equivalent message in

the SSG3 module.

CFTUBE elements are supported only in SOL 74. Known Error CR 1829

Abstract Database - DBMGR, DBSTORE - IO6600 F.E. 1203 Description

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Any database file longer than 262, 143 PRUs may fail with this error on restart.

An avoidance is to restrict all database files to be under this size. The size of a database is specified in

GINO blocks. A good approximation of the maximum allowable number is one

million/SYSBUF. (SYSBUF is the size of

the GINO buffer, which has a default of 1792.) Thus with default buffer size, limit database files to about 8900

blocks. (CDC/Cyber running under NOS only.) Known Error CR 1830

Abstract Aeroelastic Analysis - FA1 - Wrong Answers

Description

The ATEIG subroutine for eigenvalue solution has a limit of 30 iterations. If convergence is not achieved,

the subroutine continues with intermediate results without giving a warning message. This yields incorrect

eigenvalues for that condition. This has been detected when implausible real eigenvalues were produced when

complex eigenvalues were expected. Known Error CR 1831

Abstract Superelements - UMERGE - SFM 3007

Description In SOL 62, if a data recovery restart is made while performing no Phase I operations, the error will occur.

An avoidance is to add PARAM,NORSET,-1 above the subcase level. Known Error CR 1832

Abstract Static Analysis - RF24D13B - SFM 4275

Description

The error occurs when the RF Alter is used for restarts where only output requests are changed, but not

loading conditions.

The RF Alter should not be used for this condition. A standard restart may be used.

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Abstract Material Nonlinearity - SOL 66 - UFM 1105

Description

If CHKPNT YES appears in the Executive Deck, the error may occur at random places.

If checkpointing is required, use the alter: ALTER 1 $

PARAM //DIAGOFF//47 $

In general, it is more efficient to recover the input data from the database rather than use checkpointing.

Abstract Elements - ROD,HEXA - Wrong Answers

Description

In SOLS. 64, 66, and 99 the following errors occur:

A. ROD elements give wrong answers if they have torsion properties (J>0.), and the element changes direction,

even slightly, due to large deflection effects.

B. HEXA elements give wrong answers when two of the axes X,Y, or Z (see U.M. p. 2.4-70) are of nearly equal

length (that is, the element has almost square faces) and are not perpendicular.

(Part B fixed in Version 62A) Known Error CR 1835

Abstract Plotting - XYPLOT - Poor Efficiency

Description

If a plot is made of a constant function, such that the maximum and minimum y values are the same, the

automatic scaling algorithm may converge very slowly. This problem has been observed only on CYBER computers,

where it appeared to be a CP loop.

An avoidance is to set one of the scales manually with the plotting commands YMIN=0.0; YTMIN=0.0; YBMIN=0.0.

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Known Error CR 1836 Corrected Version 66

Abstract Restarts - Preface - IO66RD F.E. 314

Description

For CYBER computers using the SCOPE 3.4 operating system, the error will occur if the buffer size is greater

than 512 words, and the NPTP is sent directly to TAPE.

An avoidance is to use the "L" parameter on the "REQUEST, NPTP..." card.

Abstract Executive - SOL 76 - SFM 14

Description All of the solution sequences will compile in the recommended default region of 200K octal except SOL 76. It

will compile with an RFL of 205K octal. (CYBER only) Known Error CR 1839

Abstract Heat Transfer - SPCD - Wrong Answers

Description

If an enforced temperature is input on SPC or SPCD cards in SOL 74, wrong answers result.

An avoidance is to place the degree of freedom on a SPC1 card, and set its value with a TEMP Bulk Data card.

Abstract Dynamic Response - OLOADs - Missing Output

Description

If plots or print of OLOADs are requested in SOLs 70-72, 75, or 76, and there are no extra points, the error

occurs.

An avoidance is to place the following alter before the DMAP statement DBSTORE PGD, etc. For SOL 72, for

example, the alter is: ALTER 974 $ MSC/62 EQUIV PP, PGD/NOUE $

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Abstract Matrix Methods - DECOMP - LOGIC ERROR 582

Description For unsymmetric decomposition with spill, the error may occur. (CYBER only)

Changes in region size sometime eliminates the problem. Known Error CR 1842

Abstract Sequencing - SEQP - Various System Errors

Description

If the resequencing module spills in the SEQMR subroutine, various system errors occur. (CRAY, VAX, UNIVAC

only).

Avoidances are to:

A. Increase the memory request, or B. Use PARAM, MPCX, -1.

Abstract Elements - BEND - Wrong Answers

Description The BEND element produces incorrect element forces and stresses when thermal loads are applied to them.

Abstract Elements - PCOMP - Wrong Answers

Description The interlaminate shear stresses are incorrect for laminae that have nonzero orientations.

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Description

XYPLOT requests for MPRES output are ignored. An avoidance for SOL 31 is:

ALTER 548 $ AFTER MDATA MSC/61, MSC/62 SDR3 OEP,,,,,/OEP2,,,,,/ $ XYTRAN XYCDB,,,,OEP2,/XYPPLOT/SOLTYPE/DSET/S,N,PFILE/ S,N,CARDNO/S,N,NOPLOT $ COND NOPPLOT,NOPLOT $ XYPLOT XYPPLOT // $ LABEL NOPPLOT $

Other solution sequences may also use this alter if appropriate changes are made to the alter line number.

This error is fixed in the sss solution sequences; however the xyplot request is pres not mpres.

Abstract Transient Nonlinear Analysis - XYPLOT - Missing Plot Output

Description

In SOL 99, an XYPLOT requests may be ignored when there is no printed output

requested.

An avoidance is to request at least one grid point for printed output. Known Error CR 1847

Abstract Material Nonlinearity - TABLES1 - Wrong Answers

Description

In solutions 66 and 99, if the stress-strain curve does not pass through the origin for FORM=1 the data is

accepted, producing unrealistic answers. On future systems, such input will cause a fatal error.

Abstract Superelements - SEP2 - UFM 4222

Description If SEUSETi cards reference interior points, the error occurs. They may be applied to exterior points. In

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future systems they may also be applied to interior points. Known Error CR 1849

Abstract Superelements - SEUSET - UFM 315

Description

The card description of this card in Section 2.4 of the User's Manual has fields 2 and 3 interchanged. The

correct format is:

SEUSET, (SEID), (SNAME), ...

Abstract Cyclic Symmetry - GPFDR - UWM 2342,2354

Description

In SOL's 81 through 83, the message results when GPF0RCE or ESE output is requested.

An avoidance is to delete the DMAP line number for the GPFDR module, and change the APP parameter to APP1.

For example, ALTER 822,822 $ SOL 81, MSC/62 GPFDR CASEDR,UGVS,KELM,KDICT,ECTS,EQEXINS, GPECT,PG,QGS,BGPDTS,SILS,CSTMS,VELEM/ONRGY1, OGPFB1/APP1/V,Y, TINY $ Known Error CR 1851 Product MSC / MD Nastran Corrected Version 66

Abstract Matrix Routines - MPYTIM - Integer divide by zero

Description If large problems are run with small memory requests, the error may occur.

An avoidance is to increase the memory request. Known Error CR 1852

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Abstract Restart - Dynamics - No Damping

Description

If a restart is made from SOL 24 to a dynamics solution sequence, any damping cards present in SOL 24 (i.e.

CVISC) may be ignored.

An avoidance is to delete one damping card on restart and reinsert it.

Abstract Executive - 3380 Disk Drives - Various System Errors (21OCT82)

Description

Users may not run any version of MSC/NASTRAN prior to MSC/62 on an IBM configuration that references 3380 disk

drives. A variety of I/O related fatal messages may result from the earlier version's inability to compute

blocksize correctly on these drives. The most likely messages are one or more of the SFM 4212 codes. Some users

have had limited success by using half-track blocking with Version 61B. However, use of Version 62 is the

recommended procedure. Furthermore, users may not copy (using IBM utilities)

a MSC/NASTRAN database existing on

non 3380 disks to a file usable by MSC/NASTRAN on a 3380 disk. (IBM only) This procedure may be accomplished however, by using a short

MSC/NASTRAN

DMAP sequence to read the existing

file from the non 3380 disk and then write a Known Error CR 1854

Abstract Material Nonlinearity - EMG - SFM 3007

Description

If a SOL 66 run restarts from a prior run which had no updates of the stiffness matrix, the recovered

stiffness matrix may be incorrect.

An avoidance is to restart the run from the beginning. Known Error CR 1855

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Abstract Material Nonlinearity - Contour Plots - SFM 4276

Description

In SOL 66, when contour plots are requested for both linear and nonlinear elements, SFM 4276 will occur.

Also, if all elements are linear, SFM 3002 might occur.

An avoidance is to make linear elements into nonlinear elements by setting the yield stress very high.

Abstract Superelements - Multiple File databa - Purge of Upstream database

Description

If PARAM, DBSET1 is set to a value greater than zero, the entire upstream database will be purged during the

SEKR operation.

An avoidance is to repair two database purge statements that are in error. For SOLUTION 61, the fixes are:

ALTER 440,440 $ MSC/62

DBMGR //5/MODEL/SEID/0/DBSET1//GO$ ALTER 452,452 $

DBMGR //5/MODEL/SEID/0/DBSET1//KTT$

The change involves inserting a "0" parameter before DBSET1, and reducing the number of slashes after DBSET1

from three to two. Two similar statements will be found in all the superelement

solution sequences, at different

line numbers. They can be found by use of DIAG 14, followed by a search for statements of the form:

DBMGR //5... GO $, and DBMGR //5... KTT $

This error does not affect superelement run Known Error CR 1857

Abstract Miscellaneous - RF24D40 - Various Fatal Messages or Wrong Answers

Description

If a user-supplied DMAP loop is provided around this alter, and the FBS module is within this loop it will

result in various fatal messages or wrong answer after the first pass. An avoidance is to copy and modify the alter by inserting the following two DMAP statements;

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Known Error CR 1857 $

Just after the third occurrence of the SDR2 module insert: PARAM //STSR/V,N,SAVE74/-74

$ Known Error CR 1858

Abstract Miscellaneous - Demand Runs - FATAL MESSAGE 202

Description

If two or more MSC/NASTRAN executions are made in the same demand session,

the error may occur. (Univac only)

An avoidance is to free all MSC/NASTRAN files (i.e. PRIXX, and SECXX's) between executions in demand mode.

Abstract Miscellaneous - IBM - Compilation Errors

Description

The UTIL data set which is the third data set on the IBM deliverable tape was incorrectly blocked at 13030

bytes. This is acceptable except for installations having only DASD devices which support shorter maximum

blocksizes (i.e. 3340 devices). At these sites the UTIL data set, as issued, cannot be restored. The most

heavily used programs in the UTIL data set are DECKEDIT, NASTPLOT and TECKPLT.

Of these, DECKEDIT and NASTPLOT are

available in the NASTRAN data set which is the second file on the deliverable tape. TECKPLT is identical with the

program as issued in Version 61 and could be obtained from that source. If any other programs are required from

the UTIL data set, or any of the above solutions are unacceptable, please contact MSC. (IBM only)

An avoidance, i Known Error CR 1860

Abstract Material Nonlinearity - TA1 - Wrong Answers or Overflow Description

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In SOL 66 and 99, Orthotropic Materials defined by MAT2 or MAT9 do not work in SOL 66 or SOL 99 for any type

of elements. Known Error CR 1861

Abstract Geometric Nonlinearity - EMA - Overflow

Description

In SOL 64, 66, or 99, if the static displacement vector provided to the second subcase for differential

stiffness calculations is null, the results of the second subcase may be implausibly large, or the EMA module may

first terminate due to overflow.

An avoidance is to request loads in the first subcase that will produce a nonnull displacement vector.

Abstract Superelements - Dynamics - No Damping

Description

The Application Note of May 1981 describes a method for obtaining differential

stiffness effects in dynamic

analysis by performing a static analysis in SOL 64, followed by a special restart into SOL 63, or SOL's 67 through

72. At present, damping is not computed in SOL 64, and may not be computed

on the restart run without erasing the differential stiffness matrix.

The following alter will provide damping: Alter for damping in SOL 64 /61B or /62 ALTER 62,62 $ MSC/61B/62, SOL 64 EMG EST1,GCSTMS,GMPT,GDIT,GGEOM2,,,/ KELM1,KDICT1,MELM,MDICT,BELM,BDICT/ S,N,NOKGG=1/S,N,NOMGG=1/S,N,NOBGG=1/// V,Y,COUPMASS=-1 $ ALTER 68 $ EMA GPECT,BDICT,BELM,GBGPDT,GSILS, GCSTMS/BJJ, / $ DBSTORE BJJ//MODEL/0 $ Known Error CR 1864

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Abstract Superelements - Documentation - H/SEA

Description

The following errors have been found in the Handbook for Superelement Analysis, for Version 61.

1. Appendix J, page 3 Deck SEH616A Add after "DBSTORE EQEXINS..." DBMGR //7/////-2/UGVS/ULV $

This statement is needed to provide the presence of ULV for the next run, Deck SEH617. Its absence causes the

data recovery run for the external superelement to terminate without producing

output.

2. Appendix J, pages 4 and 5

Several decks use the DBMGR //3 and DBMGR //4 commands. They use the default values for the third parameter,

used for "search control". The default value allows several blocks with the same name to appear in the data base,

which can lead to baffling fatal errors or wrong answers. It is good practice to set the third parameter

Abstract Geometric Nonlinearity - SOL 66,99 - Wrong Answers

Description

If SOL 66 or 99 is used with only LGDISP, the beam element has incorrect stress recovery output, if I1 does

not equal I2. Output (recovered) stresses are only affected, and the solution is still correct.

An avoidance is to either:

1. Make a "Dummy" material nonlinear group (w/yield stress set to a high value)

2. Run only with I1 equal to I2. Known Error CR 1866

Abstract Material Nonlinearity - SOL 66, 99 - Wrong Answers

Description In SOL 66 or 99, a beam element with thermal loads and nonbasic coordinates

(25)

used by its end grid points gives incorrect results.

An avoidance is to use the basic coordinate system to define the beam element grid points.

Abstract Cyclic Symmetry - Restarts - Missing Modal Deformation Plots

Description

In SOL 48 restarts, requests for modal deformation plots are ignored unless the requests were also made in the cold start.

The following alter is an avoidance: ALTER 197 $

MODTRL FCASEBK1 /////1// $ Known Error CR 1868

Abstract Grid Point Stress - Subcases - Wrong Answers

Description

When there are multiple subcases in a run and in a particular subcase there is a stress request but not a grid

point stress request then the subsequent subcase grid point stress results will be wrong. This is a stress

recovery error only and does not effect the solution.

An avoidance is to put grid point stress requests (even if for only one element) in every subcase.

Abstract Geometric Nonlinearity - SSG1 - GINO Fatal Message 3029

Description In SOL 64, if only GRAV Loading is being used, GINO Fatal 3029 will occur in Subcase 2.

An avoidance is to include a dummy load. Known Error CR 1870

(26)

Abstract Miscellaneous - Composite Element wi - Incorrect Resutlsts

Description

Thermal loading at grid points (using TEMP or TEMPD) gives wrong temperature

gradients and corresponding

incorrect results in composite elements.

An avoidance is to apply TEMP loads directly to elements. Known Error CR 1871

Abstract Cyclic Symmetry - Thermal Loads - Wrong Answers or UFM 4587

Description

Temperature load cases, i.e., TEMP(LOAD)=j in SOL 81, combined with other types of loads will provide

incorrect force and stress output because the thermal strains are not correctly

handled. If temperature loading

only is requested, then UFM 4587 will occur. This situation arises because the identification number of the

temperature load "j" is not included in the CASEDR data block output by the SEDR module.

An avoidance is to utilize the following alter: ALTER 642 $ MSC/63

$ALTER 653 $ MSC/62

TABEDIT CASEDR, CONT,,,/A1 $ EQUIV A1, CASEDR/ALWAYS $

in the Executive Control Deck, and to include the following DTI cards in the Bulk Data Deck:

DTI, CONT, 1, CR, [1] , DW, 7, 7, 1, DTI1 +TI1, "j" ENDREC

DTI, CONT, 2, ER, ENDREC The number in brackets, i Known Error CR 1872

Abstract Matrix Methods - MPYAD - Mode Error 1

Description

This error condition may occur when multiplying large matrices. It is further characterized by aborting with

a "P address" between 36000 and 37400. The P address is printed out in the dump on the line that starts "P =").

(27)

Field usage of Versions 62A shows that the

fix was not fully effective. (CYBER, CDC/7600 only) Avoidances are to:

1. RFL up or down by about half of the largest dimension of any input matrix.

2. Set the REAL parameter on the NASTRAN card to core size minus the largest dimension of any input matrix.

Core size may be determined from DIAG 13.

3. Deselect Method 1 and Method 1T. This should be done locally using a DMAP Alter statement, rather than on

the NASTRAN c Known Error CR 1873

Abstract Miscellaneous - PARM Field - Incorrect PARMs

Description

The PARM option provided in the PROC delivered with NASTRAN allows up to 100 characters of input, based on

inherent JCL limits. (See Section 7.6.2.1 of the A.M.) Submitting more data results in JCL fatal error messages.

MSC/NASTRAN will process less data than this, however, with the remaining data set to unpredictable values. The

equation for the limit of data properly processed by MSC/NASTRAN is 4S*7+(OTHERS)*4<41

WORDS, where "S" is the

number of S(I) type parameters, and "OTHERS" is the number of conventional

symbolic parameters. (IBM only)

An avoidance is to stay beneath this limit, and set any remaining parameters on the NASTRAN card.

Abstract Database - COPY to TAPE - Various, including IO6600 1203,1204

Description

For CYBER computers, Section 7.6 of the Application Manual gives examples of Control Language cards used to

copy databases from disk to tape, then back to disk. The CDC utility program COPYBF is listed to perform this

task.

Most data centers have had better results when using the COPY utility program, particularly when the errors

(28)

above are encountered. The best advice for individual users is to contact their data center personnel when

developing these Control Language cards, because each data center may have

modified utilities. The MSC

documentation will be changed to from COPYBF to the COPY utility, after testing. For example, the line in the

example of page 7.6-345 (April 1981) would be changed from COPYBF(TAPE,DB01) to COPY(TAPE,DB01) Known Error CR 1875 Product MSC / MD Nastran Corrected Version 66

Abstract Cyclic Symmetry - SOL 81 - Wrong Answers

Description

LOADSET and LSEQ cards may not be used in this solution sequence. An avoidance is to use the LOADCYi cards, which provide most of the same functions. In Version 67 UFM 6229

will be issued to inform the user that these commands are not supported in static analysis with cyclic symmetry.

Abstract Transient Response - Modal Damping - Wrong Answers

Description

In modal transient response solution sequences, results for modes with more than critical damping are

incorrect when the uncoupled method is used. (TABDMP1 input only for damping

results in use of the uncoupled method.)

An avoidance is to force the coupled method by adding an insignificantly small damping value to the existing

damping by use of a B2PP DMIG matrix. Known Error CR 1877

(29)

Corrected Version 66

Description In modal frequency response, using the DDRMM method (which is now the default), stresses for end B appear in

the wrong output position. Known Error CR 1878

Description

If the input describing BEND elements results in negative radius R-sub-B or arc angle THETA B greater than 180

degrees, both of which are illegal, a user fatal message is not produced. Implausible answers result.

Abstract Restarts - Version 61B to Versi - SFM 41

Description

On restarts between different versions, new features may cause restart errors. One example is the element

strain energy density feature introduced in Version 62. It requires a file named VELEM, which contains element

volumes.

One avoidance is to force execution of the module which generates the file. For example:

ALTER 43, 43 $ SOL 24, OR ALTER 50, 50 $ SOL 3

ELTPRT ,,,,,EST/VELEM/V,Y,EST=2$ DELETE, REINSERT FORCE RESTART Known Error CR 1881

Abstract Superelements - DMIG - Continue on Error

Description

If PARAM, ERROR, is used, the design intent is that fatal errors in Phase I will cause termination of

processing for one superelement, then branching to the next superelement. Termination of the run should occur

(30)

after all Phase I operations have been attempted.

It has been found that certain Phase II or Phase III user fatal errors may not cause termination of the run.

An example is input of conflicting data for one or more elements of a P type matrix. If PARAM, ERROR, 0 is used,

all pages of output should be scanned for error messages. Known Error CR 1883

Abstract Database - Store or Fetch - SFM 4212

Description

ERROR CODE 41, or IO 370 FATAL MESSAGE 600 (30NOV82) This error occurs when more than one block is stored per track. An avoidance is to use full track blocking,

that is, adjust BUFFSIZE on the NASTRAN card to be equal to the value given for the device being used as given on

page 7.6-8 of the Application Manual. Note that this implies that old data with smaller buffsizes must be

discarded, and that the REGION parameter may need to be increased, as described

in the reference. (IBM only)

If an old database has encountered this problem, and it is required to restart from it, rather than discard

it, the following strategy may work:

a. Purge enough files at the end of the database to release the last [M] blocks written on, where [M] is the

number of blocks per track Known Error CR 1884

Abstract Executive - Installation - Various (5OCT82)

Description

MSC/62 will not operate on VS1 operating systems or older operating systems because of the absence of code for

modulo storage devices.

An avoidance is to install the PTF which supports modulo devices. It is not necessary to have these devices

available, merely to have provisions for them in the operating system. Known Error CR 1885

(31)

Abstract Frequency Response - Subcases - Missing Output

Description

In SOL 30, if looping occurs, output requests after the first subcase will be ignored. Looping is caused by

changes of FREQ, SDAMP, TFL, or P type DMIG's cards between subcases. An avoidance is put in the DMAP Alter:

ALTER 622 $ FILE IQG1=SAVE/IPHIG1=SAVE/ IES1=SAVE/IEF1=SAVE $ FILE IQG2=SAVE/IPHIG2=SAVE/ IES2=SAVE/IEF2=SAVE $ TABPT IQG1,IPHIG1,IES1,IEF1//$ TABPT IQG2,IPHIG2,IES2,IEF2//$ Known Error CR 1886 Product MSC / MD Nastran Corrected Version 66

Abstract Dynamic Response - Restart - Missing output (12OCT82)

Description

If no output results on a data recovery restart in SOL 30 or SOL 31, or some requested items are not present,

the cause is usually because the modal output files were retrieved from the OPTP. Only data selected on the prior

run may be selected on the restart run. The modules that generate this output (SDR1, SDR2) can be scheduled for

reexecution by deleting any PARAM,DDRMM,(N) cards that exist, and reinserting

them. If there are none, insert the

default value (0) for N, that is, add PARAM, DDRMM, 0 to the bulk data. Known Error CR 1887

Abstract Material Nonlinearity - Documentation - No Loads Available

Description

The example problem shown on pp. 2.14-111,-112 (April 1982) is missing two cards, and will not run to

completion. The cards needed are: FORCE,175,10000,10,50.0,-1.0 FORCE,175,10001,10,50.0,-1.0 Known Error CR 1888

(32)

Known Error CR 1888 Corrected Version 66

Abstract Superelements - Preface - Machine Dependent System Errors

Description

For XYPLOT requests, if there are no cards between OUTPUT(XYPLOT) and SEPLOT (N), the error may occur. For

example SFM 4276 GREAD ERROR CODE 3002 appears on VAX computers. An avoidance is to insert a card between the two listed. For example, PLOTTER NAST is adequate.

Abstract Aeroelasticity - AMG - Divide by zero (0C4)

Description

Some aeroelastic models using CAER02 cards cause divide check error in Subroutine AMGPFS on IBM Version 62 due

to a compiler error. (IBM only)

A super-zap avoidance is available from MSC. Known Error CR 1890

Abstract Superelements - Restart - No Inertial Loads

Description

If PARAM,SOLID is changed on restart, the mass matrix must be regenerated by the SEMG operation. If it is

not, inertial loads in static analysis will be null (GRAV, RFORCE) and superelements

will be massless in dynamic analysis.

A less costly avoidance then reexecution of the SEMG operation is to add another name to the stored mass

matrices by use of the database equivalence statement: BEGIN $ STANDALONE DMAP PROGRAM

DBMGR //7/C,Y,OLDSOLID=0/C,Y,SEID/ C,Y,NEWSOLID/C,Y,SEID//MJJ/MJJ $ END $ CEND ... ... BEGIN BULK PARAM,NEWSOLID,2 PARAM,SEID,10 ENDDATA

(33)

This is a stand-alone run which restarts from a run which used the default for PARAM,SOLID (which is zero). It is run in

Abstract Aeroelasticity - Bodies - UFM 2025

Description

When SOL 75 or 76 has bodies and interference groups combined in the bulk data a UFM 2025 will occur during

execution of the GI module. This is probably caused by having bodies in the first group.

An avoidance is to try to keep all bodies in last group. Known Error CR 1892

Abstract Sequencing - Preface - UFM 316

Description

If the SEQP module is requested to punch SEQGP cards, and these cards are used on a subsequent run, some SEQID

numbers may not be unique, which causes the preface error, referencing the SEQGP cards. This has been observed on

models where some grid points are not connected by elements. Avoidances are to:

1. Discard the SEQGP cards and rerun the sequencer. The module that processes these card images performs

correctly when duplicate SEQID's are present, or

2. Delete the cards in error, and replace one of the illegal SEQID's by adding .1 to it. That is, change

10002 to 10002.1 Known Error CR 1893

Abstract Matrix Methods - Decomposition - I/O 6600 FATAL ERROR 201 (21OCT82)

Description

If spill occurs during matrix decomposition, the error may occur. (CYBER and CDC/7600 only)

Avoidances sometimes are to:

1. Place the following Executable code Patch on the NASTRAN card. Note that the character in

(34)

front of decimal points is an O, not a zero:

SYSTEM (O.6251)=O.04000221510400022151 $ CYBER, /62 or

SYSTEM (O.6014)=O.04000074530400007453 $ CDC/7600, /62 or

2. Increase or decrease core by twice the order of the matrix, or

3. Change the BUFFSIZE

Abstract Superelements - SEMA - SFM 4276 FREAD ERROR CODE 3002

Description

This error has been observed when there are more than 10 superelements. A machine-dependent error message

results. Usually, the message number is SFM 4276 FREAD ERROR CODE 3002. An avoidance is to increase the memory request.

Abstract Restarts - SOL 24,Heat - Restart Failure

Description

On UNIVAC 1100/80, Version 61B will fail with a contingency type=2 message when a restart, with plot requests

is made in SOL 24,HEAT and module GP2 is not executed.

An avoidance is to run Version 62 or include the following alter to Version 61B: ALTER 15 TABPT PSIL // $ Known Error CR 1896 Product MSC / MD Nastran Corrected Version 66

(35)

Abstract Material Nonlinearity - Gap Element - Wrong Results

Description

In Solutions 66 and 99, the shear force is incorrect for GAP elements with tension (i.e. open). If shear

force is not required, set KT=0 on the PGAP data card. If shear force is desired, the following avoidance will

assure that open gaps have a tiny compression: Set F0 on the PGAP data card to KB*(maximum expected opening), with

KB tiny. Known Error CR 1897

Abstract Aeroelasticity - Interference Groups - UFM 2025

Description

Whenever interference groups are used in conjunction with bodies on the first interference group, the GI

module will produce UFM 2025. This is caused by APD preparing an incorrect CSTMA data block.

Abstract Cyclic Symmetry - CYCLIC4 - SFM 3007

Description

If the size of the matrices after the cyclic transformation is greater than 65,536, SWM ****, "BAD TRAILER FOR

FILE ****" will appear several times, then the run will eventually fail. The trailers will indicate that the

number of rows or columns of some matrices will be greater than the limit shown above.

An avoidance is to put ASETi cards on boundary points. Known Error CR 1899

Abstract DMAP - OUTPUT4 - Wrong Answers

Description

For the BCD option, if the first column in a matrix to be output contains null columns, the matrix output may

be missing columns. If there are more than one matrix output per DMAP call,

(36)

the matrix produced by OUTPUT4 will

produce a "CONVERSION ERROR" if processed by INPUTT4. Avoidances are to:

1. Put one small number in null columns,

2. Output only one matrix per OUTPUT4 DMAP call. Known Error CR 1900

Abstract Matrix Methods - MPYAD Method 1 - 0C4 or Wrong Answers (22OCT82)

Description

If large regions are used, the error may occur. This error has been observed when using Method 1 on a

multiply of a 300 row square matrix times, a 300 row by 10 column matrix. The first column of the answer was

correct, with other columns missing many numbers. (IBM only) Avoidances are to:

1. Decrease the region to 800K Bytes, or 2. Deselect Method 1

Abstract DMAP - INPUTT4 - Wrong Answers

Description

1. If the input matrix is in a different precision than the output matrix,the matrix trailers will be

calculated incorrectly, leading to wrong answers or various system errors in modules which use these files.

2. The binary output format, using the dense matrix option, produces bad trailers on short work machines.

Again, modules which use these files will have unpredictable behavior. An avoidance is to request the sparse matrix option on short word machines.

Abstract Database - DBSTORE - SFM 4276 ERROR CODE 7777

Description This error occurs when more than 32,768 GINO blocks are stored in a single database. (VAX only)

(37)

blocks. Known Error CR 1904

Abstract Miscellaneous - VAX/VMS 3.0 - Multiple RF Alters

Description

When using multiple RF Alters, the plus symbol, (+) in the NASTRAN command is illegal under VAX/VMS 3.0

operating system.

An avoidance is to change the NASTRAN procedure so the reference to RFA in the SUBMIT command is "RFA".

Abstract Restart - SOL 30, 31 - Poor Efficiency

Description

For restarts from SOL 3 to SOL 30 or SOL 31, the default value of parameter DDRMM may not be set properly,

leading to use of a more expensive data recovery method. There have been a series of such DMAP errors over the

last few systems, which occur in different paths through the program. A good practice is to place PARAM,DDRMM,0 in the deck in SOL 30 and 31, and not rely on defaults.

Abstract Miscellaneous - Preface - UFM 327

Description

Large Bulk Data Decks may fail with UFM 327, especially when there exists a large number of cards of one type;

such as, DMIG. Symptoms of the error appear after the bulk data has been sorted. Two symptoms are: (1) data

appearing in different fields than the unsorted input or (2) cards sorted in the wrong order. (IBM only)

For DMIG cards, a possible avoidance is to use the INPUTT4 module as an alternative to matrix input.

The error exists in load module LINKNS01 and can be corrected with the SUPERZAP program. The following data

should be supplied to SUPERZAP to make the fix: CSECT=DEFFLD, OFFSET=006A,

(38)

VER=95F93000, and REP=95F92000. Known Error CR 1907

Abstract Eigenvalue Analysis - READ - GINO 1409

Description

If the F1-F2 option is used on the EIGR card using the GIV method, a SUPORT card is used, and F1 is below the

frequency of the first flexible mode, the error may occur. An avoidance is to use the ND field instead of the F1- F2 fields. Known Error CR 1908

Abstract Aeroelasticity - AMP - 0C1

Description

This error has been observed in Version 62. (IBM only) An avoidance is: ALTER 982 PRTPARM //$ Known Error CR 1909 Product MSC / MD Nastran Corrected Version 66

Abstract Superelements - INREL - SFM 4276 ERROR CODE 3012

Description

This error may occur if dynamic reduction or component mode synthesis is used.

An avoidance is to deselect Method 4 transpose matrix multiplication on the NASTRAN card.

Abstract Elements - MAT2 - Input data ignored

Description If a pair of MAT1 and MAT2 cards have the same ID (which is illegal), the MAT1 card is used, and the MAT2 card

(39)

Abstract Executive - XCEI - Gino 1102

Description

If DTI or DMI cards are present, and data pool housekeeping occurs, the error may occur. This condition is

most likely to occur when there is extensive looping, such as in superelement

or cyclic symmetry processing.

An avoidance is to store the DTI and DMI cards in the database on a seperate run, and perform the runs where

looping occurs by fetching these files from the database. This function is performed automatically in the

superelement sequences for the DTI cards SETREE, ESTDATA, SPECSEL, and SPSEL.

That is, if they are present on a

run, they may be deleted on subsequent runs, where they will be automatically

fetched from the database. Known Error CR 1912

Abstract Elements - IFP - UFM 4384

Description

The error occurs with PCOMP cards when unsymmetric ply orientations of exactly plus or minus 45 degrees are

used, and the MAT8 card has a thermal coefficient of expansion. An avoidance is to input the orientations at plus or minus 46 degrees. Known Error CR 1913

Abstract Material Nonlinearity - TA1 - Wrong Answers or Overflow

Description

In SOLs 66 and 99 with large displacements, anisotropic linear materials produce incorrect results when the

material orientation is nonzero or MID2 is not equal to MID1 in shells. Use only MID2=MID1 and THETA = 0.0 on

QUAD4, TRIA elements.

This error is related to error 1860, which was partially fixed for MSC/62A. See error reports for MSC/62 for

(40)

Abstract Elements - HEXA - Wrong Answers

Description

Wrong Loads occur with the HEXA element under thermal loads when using the integration method 2 (default) and

the element geometry has taper (i.e. when the Gauss point Jacobians are unequal).

An avoidance is to use the new integration method 0. Known Error CR 1915

Abstract Elements - SDR2 - Floating Point Overflow

Description

A plate element (QUAD4, QUAD8, TRIA3 OR TRIA6) with a very small thickness

may fail in SDR2 if the thickness

cubed underflows to zero, even if membrane analysis is only requested. Known Error CR 1916

Abstract Matrix Methods - FBS - Poor Efficiency

Description

Method 2 FBS time estimates are overly conservative, and can lead to "insufficient time" fatal errors or use

of Method 1 when Method 2 would be cheaper.

A rule of thumb is that if Method 1 requires more than five passes, Method 2 is probably cheaper. Method 2

can be forced with the FBSOPT Keyword on the NASTRAN card. The insufficient

time exits can be prevented by placing

a large value for time limits on the executive control card TIME. Known Error CR 1917

Abstract Heat Transfer - PENTA - Wrong Answers or UWM 4420

Description UWM 4420 or "NEGATIVE TERMS ON THE FACTOR DIAGONAL" or other messages

(41)

can occur when left handed PENTA elements are used in Heat Transfer.

An avoidance is to use right handed numbering convention. Known Error CR 1918

Abstract Material Nonlinearity - Superelements - Restarts

Description In SOL 66, multiple file databases and usage of PARAM,RESDUAL will not work.

Abstract Material Nonlinearity - Superelements - Restart Failure

Description

In SOL 66, with tip superelements, if the SEID is less than or equal to the number of nonlinear loops, the

superelement data may be purged thus crippling the restart capability. An avoidance is to use large SEID numbers (larger than the DMAP loop indices).

Abstract Material Nonlinearity - SOL 66 - SFM 3081

Description

In SOL 66 when MPC's are used in a subcase and then removed in a later subcase, SFM 3081 and SFM 3007

(subroutine NLMAPS) will occur.

An avoidance is to include a dummy MPC in the subcase where the real MPC had been removed.

Abstract Static Analysis - SSG1 - Illegal Operation

Description If a METHOD card is present, but a LOAD Case Control card is not present, an error may occur. On IBM, for

(42)

instance, an 0C1 message appears.

An avoidance is to add a LOAD Case Control card. Known Error CR 1922

Abstract Sequencing - PARAM,START - CPU Loop

Description The PARAM,START card, used to influence the starting point used by the sequencer, may cause an endless loop in

the SEQP module. This parameter should not be used. Known Error CR 1923

Abstract Aeroelasticity - UMERGE1 - SFM 3007

Description

This error occurs in SOL's 75 and 76 when PARAM,OPPHIPA,1 is used. An avoidance is to add the following alter:

ALTER 968,968 $ MSC/62, SOL 76 ALTER 905,905 $ MSC/62, SOL 75 EQUIV PHIKA,PHIKH/NOUE COND SKPPKH,NOUE $ PARAML PHIDH//TRAILER/1/V,N,NOMDS $ PARAM //C,N,SUB/V,N,NOIS/NOMDS/NOUE $ MATGEN /PHIDV/6/NOMDS/NOIS/NOUE $ MERGE PHIKA,,,,PHIPV,/PHIKH/1 LABEL SKPPKH $ Known Error CR 1924 Product MSC / MD Nastran Corrected Version 66

Abstract Superelements - PARAM,NODATA - SFM 3001, Various

Description

The DYNAMICS data block is not properly recovered from the database for data recovery restarts. This may lead to errors for modules which require it for input, such as RANDOM.

An avoidance for this type of restart is: ALTER 1100 $ BEFORE DPD MSC/62, SOL 71 DBFETCH /DYNAMICS,,,,/ $

(43)

Abstract Aeroelastic Analysis - SOL 75 - Missing Output

Description

Flutter Analysis with the KE-method does not loop in the FA1 module as described in the Aeroelastic

Supplement. The FLUTTER card selects a list of density ratios, Mach numbers and reduced frequencies for the

KE-method.

When the KE-method is used, the first Mach number on the referenced FLFACT card will use all the density

ratios and all the reduced frequencies on their respective FLFACT cards. The remaining Mach numbers will use only the first density ratio. The printed flutter summaries are correct, but not all of the requested output will be computed. It is recommended that only one Mach number appear on the FLFACT card per run. The remaining output can be obtained by a restart, while referring to only one Mach number.

Abstract Differential Stiffness and Buc - READ - SFM 3007

Description

In SOL 65, if superelements are present, the differential stiffness matrix is not stored in the database,

leading to the above error, or perhaps others.

An avoidance is to add the following alter. It also eliminates the use of PARAM,SOLID1. The DMAP will be

changed in a similar manner for MSC/63, so that this alter will provide a database that will be upward compatible

with MSC/63.

ALTER 203,203 $ REPLACE FETCH ON UGVS. MSC/62A. SOL 65 DBMGR //11/SOLID/SEID/DBSET3/S,N,NP//UGVSTAT

$ TEST FOR PRESENCE COND LBLREST,NP $

DBMGR //9/SOLID/SEID/SOLID/SEID/DBSET3/UGVS/UGVSTAT $ RENAME

LABEL LBLREST $ AVOID RENAME ON SOL65-SOL65 RESTART DBFETCH /UGVSTAT,ETT,,,/SOLID/SEID//DBSET3 $

ALTER 209,209 $

EMG EST,CSTMS,MPT,DIT,GEOM2S,UGVSTAT,ETT,EDT /KDELM,KDDICT,,,,/1/0/0/