current meter mooring

Top PDF current meter mooring:

Report of the Third Meeting of the CLIVAR GOOS Indian Ocean Panel, February 27   March 2 2006, Honolulu, USA

Report of the Third Meeting of the CLIVAR GOOS Indian Ocean Panel, February 27 March 2 2006, Honolulu, USA

The Department of Ocean Development (DOD), Government of India, initiated the Ocean Observing System (OOS) programme in 1997 for long-term current measurements in the equatorial Indian Ocean through the Indian National Centre for Ocean Information System (INCOIS), Hyderabad. Under the IndOOS, 3 locations were selected along the equator for deploying the current meter moorings at 93°E, 83°E and 76°E (Fig 1). The responsibility of executing the project Long-term measurements of the currents along the equator through current meter moorings was given to the National Institute of Oceanography (NIO), Goa. This project was implemented at NIO in 2002 after developing a suitable mooring design and procuring the current meters and relevant hardware. The mooring was designed with 6 Recording Current Meters (RCMs) at 100 m, 300 m, 500 m, 1000 m, 2000 m and 4000 m. The first deep-sea current meter mooring was deployed successfully in February 2000 at equator, 93°E onboard ORV Sagar Kanya. This mooring was successfully recovered in December 2000 and data were obtained from all the RCMs. The mooring was redeployed and the new second mooring was deployed at equator, 83°E in December 2000. In March 2002, these two moorings were recovered and data were obtained. While redeploying these moorings at the same locations, a new third mooring was deployed at equator, 76°E. In October 2003, all the three moorings were recovered and redeployed for one more year, but the mooring at 76°E was shifted to 77°E (Fig 1). In October 2004, all the three moorings were recovered and re-deployed. One upward-looking ADCP was placed at 100 m on top of each mooring. The three moorings will be serviced again during August - September 2006 onboard ORV Sagar Kanya and redeployed at the same locations. Three 75 kHz uplooking ADCP’s will replacing the present 300 kHz ADCP’s for better range of current profiling of about 400 m.
Show more

32 Read more

RRS "Discovery" Cruise 51, 4 November   18 December 1972: Physical oceanography and geology N E  Atlantic and N W  Mediterranean

RRS "Discovery" Cruise 51, 4 November 18 December 1972: Physical oceanography and geology N E Atlantic and N W Mediterranean

Current meter mooring 7^ litre water sample Surface bucket samples TSD Rosette sampler Camera Water bottles Core with Southampton University No, Dredge Rectangular Marine Trawl Neuston N[r]

37 Read more

Draft ANDRILL Moored Data 2006 Report Richard Limeburner, Robert Beardsley and Sean Whelan January 4, 2007

Draft ANDRILL Moored Data 2006 Report Richard Limeburner, Robert Beardsley and Sean Whelan January 4, 2007

A current meter mooring was deployed on October 25, 2006 on the frozen surface ice of the Ross Sea in support of the ANtarctic DRILLing (ANDRILL) project by Richard Limeburner (Woods Hole Oceanographic Institution), David Harwood (University of Nebraska), and Peter Webb (Ohio State University). The mooring site is located at the SMS site 77° 45.157’ S and 165° 29.372’ E, approximately 18 miles west northwest of McMurdo Station, Antarctica. The SMS mooring site is normally covered with seasonal sea ice, but at present the region has been permanently frozen for the past 10 years (Figure 1).
Show more

15 Read more

Daily plots of current vectors obtained during JASIN 1978

Daily plots of current vectors obtained during JASIN 1978

Current Meters: 200m to 1500m With the exception of mooring W1, all of these instruments are Aanderaa recording current meters W1 1000m is an AMF Vector Averaging Current Meter... Aander[r]

148 Read more

Influence of water depth variation on the hydrodynamics of deep-water mooring characteristics

Influence of water depth variation on the hydrodynamics of deep-water mooring characteristics

The added mass and radiation damping are calculated in frequency domain for a range of frequencies and transferred from the frequency domain using an Inverse Fourier Transform Cummins (1962). The whole motion response no longer split into WF and LF parts. Instead, the output of motion response will be a combination of WF, LF and mean drift response. Coupling effects between floating body and mooring lines

14 Read more

Investigation on motion responses of a semi-submersible platform and its mooring system

Investigation on motion responses of a semi-submersible platform and its mooring system

For surge motion, when length of the upper chain increases, its RAO is larger accordingly and the mean position deviates farther reaching almost 9m, which is caused by smaller dynamic mooring loading. Increasing length of the middle cable, on the other hand, does not change the RAO but relatively larger dynamic mooring loading restricts drift movement a bit. For heave motion, the configuration of Case A leads to a slight increase of its RAO while the mean position falls under the initial draft since the vertical component of pretension alters the floating status of the platform. On the contrary, RAO remains nearly unchanged for Case B and the mean position rises slightly for a similar reason. For pitch motion, three curves are rather close and RAOs are also quite similar.
Show more

8 Read more

Current and Voltage Measurements. Current measurement

Current and Voltage Measurements. Current measurement

• For accurate current measurements , the resistance of the current meter (connected in series with the circuit element under testing), must be much smaller than that of the tested e[r]

24 Read more

Hydrodynamic loading of catenary mooring lines

Hydrodynamic loading of catenary mooring lines

The envelope approximation described above assumes that during an oscillation cycle the changes in suspended line profile vary sinusoidally between the datum profile and the extremes of the envelope. Liu and Bergdahl (1998) develop the envelope model of Huse to account appropriately for the disproportionate distance from the equilibrium position of the line to the envelope extremes if a single cycle is considered as two half cycles, each starting at the equilibrium position, see figure 2.2. Baduin and Naciri {SJ&9T) derive a modified envelope approximation by accurately accounting for the velocity change at each time step through the calculation of a number of mooring line profiles. The results of the model are shown to compare well with data generated from time domain dynamic analysis software. Although based upon the catenary equations, Koterayama et al (1994) presents an approximation that differs from Huse’s envelope approach because it includes re­ calculation of the line profile at each time step. Within the method the mean vertical height of the suspended line is calculated at each time increment. The relative change of mean height for each time step is then used to determine a representative velocity for the entire line, from which a prediction of the hydrodynamic loading is calculated. The resultant vertical loading is transformed into a horizontal restoring force using linear stiffness coefficients found from catenary theory. The approximation is however limited to small oscillations of the suspension point about the equilibrium position about which the restoring force, from which stiffness coefficients are calculated, may be assumed linear.
Show more

314 Read more

Semiconductor I. Semiconductors. germanium. silicon

Semiconductor I. Semiconductors. germanium. silicon

• When a diode is connected to a battery as shown, electrons from the n-side and holes from the p-side are forced toward the center by the electrical field supplied by the battery. The electrons and holes combine causing the current to pass through the diode. When a diode is arranged in this way, it is said to be forward- biased.

54 Read more

Subsea Gas Pipeline Risk Assessment During Hot Tapping Installation

Subsea Gas Pipeline Risk Assessment During Hot Tapping Installation

The paper is organized as follows: Section 2 presents the safe distance between mooring chain and the existing facilities as a reference for positioning the mooring point of crane barge. Section 3 explains the risk level due to hot tapping installation using crane barge. It was determined by analyzing frequency and consequence then will be mapped into risk matrix according to DNV- RP-F107. Section 4 shows the result mooring analysis and the risk assessment and Section 5 contains the conclusions and suggest mitigations.

7 Read more

03   Introduction to Circuit Protection, Control, and Measurement pdf

03 Introduction to Circuit Protection, Control, and Measurement pdf

An electrical unit is built with great care to ensure that each separate electrical circuit is fully insulated from all the others. This is done so that the current in a circuit will follow its intended path. Once the unit is placed into service, however, many things can happen to alter the original circuitry. Some of the changes can cause serious problems if they are not detected and corrected. While circuit protection devices cannot correct an abnormal current condition, they can indicate that an abnormal condition exists and protect personnel and circuits from that condition. In this chapter, you will learn what circuit
Show more

214 Read more

Moored current meter records, Celtic Sea March   May, 1978

Moored current meter records, Celtic Sea March May, 1978

Meter started Meter stopped Total number of readings Timing error Start of useful record End of useful record Length of useful record Comments.. The bottom frame was not recovered...[r]

153 Read more

Improved coupling Pharos Diffrac : including spatial variations in wave conditions along a ship's hull in dynamic mooring analysis

Improved coupling Pharos Diffrac : including spatial variations in wave conditions along a ship's hull in dynamic mooring analysis

To get an indication of the working of the coupling, the wave forces have been calculated in DIFFRAC for the coupling method and the reference method. From a comparison, it became clear that the coupling method followed the trend of the ideal situation, however for higher frequencies the relative error became larger. The coupling method and the existing method have been compared with the MOORINGS output. From this output it became clear that the newly developed coupling method is the most accurate method for calculating the mooring conditions. However the effect of the improvement using the coupling is not significant. This can be clarified by the fact that calculations are based on wave conditions with a wave height of one meter. For more extreme situations it is expected that the results from the coupling method show significant improvements in comparison with the common method. It can be concluded that the new developed coupling theory has big potential to become the standard way of calculating mooring conditions in a dynamic mooring analysis. The current research is based on a situation with ideal conditions, and many simplifications have been made in this research. This decision has been made to get a pure comparison between the methods. However, for future research it is recommended to investigate whether the coupling will also generate the same
Show more

100 Read more

Ahead in power distribution

Ahead in power distribution

The metered PDU’s with local input current meter allow network engineers to utilize the PDU’s True RMS power monitor to precisely measure the current (in A) that the IT devices are drawing from the power circuit. When new servers and devices are added, the impact on the cumulative power consumption can be observed immediately. Thus allowing the engineer to load each circuit to its maximum capacity without the danger of overloading causing possible failure.

16 Read more

FS Poseidon Cruise 300/1, 04 Jul   16 Jul 2003  Biogeochemistry at the Porcupine Abyssal Plain Observatory

FS Poseidon Cruise 300/1, 04 Jul 16 Jul 2003 Biogeochemistry at the Porcupine Abyssal Plain Observatory

guesswork was involved in deciding on the appropriate level of ballast for this depth but this proved to be very close to the correct level. The sediment trap mooring PAP#3 was then successfully deployed for recovery in Summer 2004. In order to obtain a precise fix on the deployed PAP#1 mooring and to determine if it could be detected using the ships sonar system, a survey was carried out at the site during which the mooring was definitely detected on two occasions with hard acoustic returns from several structures on the mooring. The 13 th started with the usual primary production CTD leading on to a highly successful recovery of the PELAGRA trap in excellent sea conditions. Immediately after recovery, a CTD was carried out for comparison with the sensors on the PELAGRA.
Show more

37 Read more

IMPACT OF THE WATER QUALITY OF NAPOLAN RIVER TO THE  RESIDENTS OF BRGY. NAPOLAN, PAGADIAN CITY,  ZAMBOANGA DEL SUR, PHILIPPINES

IMPACT OF THE WATER QUALITY OF NAPOLAN RIVER TO THE RESIDENTS OF BRGY. NAPOLAN, PAGADIAN CITY, ZAMBOANGA DEL SUR, PHILIPPINES

The pH meter, salt meter, hand held dissolved oxygen meter, TDS meter, and conductivity meter were used in determining pH level, salinity, dissolved oxygen, total dissolved solid and electrical conductivity, respectively while presence of coliform bacteria was done by bringing the water samples immediately toPagadian City Water istrict (PCWD) laboratory for analysis. PHC method was used in determining the presence of coliform bacteria.

11 Read more

Moored current meter records  "Discovery" Cruise 20 October, 1967  N I O  moorings 012, 013, 014, 015, 016

Moored current meter records "Discovery" Cruise 20 October, 1967 N I O moorings 012, 013, 014, 015, 016

Comments on record The current meter worked well, the main characteristics of the record being a predominantly semi-diurnal variation in current speed between extremes of 32.0 and 2.5 cm[r]

112 Read more

Data Management Software

Data Management Software

Meter Site A means of collecting meters, meter groups and other meter sites into a hierarchical organization of meters. This hierarchy enables easier organization of meters (for example into geographical areas), simplified reporting and negates the need for meters to be managed individually.

24 Read more

Smart Energy Meter For Iot Applications

Smart Energy Meter For Iot Applications

A. Microcontroler and analog to digital conversion The microcontroller used in the energy meter system is an 8-bit Atmega328p [9] embedded on an Arduino ProMini board. This board has the all required components for a minimalist microcontroller system and includes IO pins for analog and digital interface. There are a few versions of this board differing in voltage supply and consequently in clock frequency. Due to SD card and LCD voltage restrictions the used board version is powered with a 3.3V power supply. The 3.3 V supply limits the clock on the arduino board to 8MHz which degrades processing performance. However it is still enough for all the functions required in the energy meter and has the advantage of lower power consumption. It is also a challenge to optimize the complete system timing.
Show more

5 Read more

Study of Alloy Springs with Magnetorheological Dampers for Vibration Isolator Device

Study of Alloy Springs with Magnetorheological Dampers for Vibration Isolator Device

As shown in Tables 7 and 8, the most favorable para meters obtained for the four factors at the three levels we re a spring wire dia meter of 10 mm (A3), spring center diameter of 50 mm (B1), spring coil spacing of 20 mm (C1), spring material of SUS316 (D3), and damper current of 0 A (E). The para meters had the follo wing order o f importance in their effect on the vibration isolation mechanis m: spring center dia meter > spring wire d ia meter > spring coil spacing > spring materia l > da mper current. Fig. 5 shows the S/N (smaller) factor response diagram of von Mises stress.
Show more

6 Read more

Show all 10000 documents...