Top PDF Wireless Test Bench Simulation

Wireless Test Bench Simulation

Wireless Test Bench Simulation

In addition to the characterization and implementation portion of the AVM (Fast Cosim) mode, there is also a user-selectable verification step. If the user specifies a non-zero verification Stop Time, then the normal Circuit Envelope simulation is performed in parallel with the fast cosimulation predictions. The error over this verification is then calculated and output to determine how well these predictions are performing. If the behavior is unacceptable, as determined by the Accept Tolerance, then the AVM (Fast Cosim) will be disabled and only the normal Circuit Envelope results will be used. Clearly, if used, this verification time should be set long enough to include a representative portion of the input signal. This may need to take into
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Analytical-and-Experimental Simulation of WWER-1000 Fuel Rod Behaviour under Initial Stage of LB LOCA at the Test Bench "Parameter"

Analytical-and-Experimental Simulation of WWER-1000 Fuel Rod Behaviour under Initial Stage of LB LOCA at the Test Bench "Parameter"

For numerical description of the processes of ductile-plastic deformation of fuel rod cladding under quick changing of the loading conditions the experimental check is required with the accident scenarios corresponding to the design understanding the processes of the core accident scenarios [1]. Full reproducing the scenarios of the accident initial stage is rather difficult from the technical point of view, as, for example, implementation of high impulse load on fuel rod simulator heater, being of the order of 100 kW/m, as well as the necessity to synchronize the parameters and rates of their variation in the course of the experiment. The experiments, performed earlier in different organizations of Russia on studying the behaviour of fuel rod claddings at the accident initial stage, consider, as a rule, only its separate aspects due to difficulties in reproducing the whole combination of the effects on fuel rod cladding, and use the method of direct electric heating of claddings that could effect noticeably the mechanical properties of cladding materials during tests. Due to the listed difficulties in experimental simulation of the accident initial stage a plant shall be constructed for testing a single fuel rod simulator, and technical solutions of this plant shall be further used in constructing the plant on testing the 7-fuel rod assembly.
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Simulation Design of Variable Frequency Speed Regulating System for Automobile Remanufactured Generator Test Bench Based on Matlab

Simulation Design of Variable Frequency Speed Regulating System for Automobile Remanufactured Generator Test Bench Based on Matlab

As a raw material for remanufacturing production, the generator failure mode is different. To ensure the quality of the generator, we need to test the performance and quality of the remanufactured generator. Therefore, we need to develop a test stand with high precision, high efficiency, and general-purpose performance to test the generator. On the other hand, the parameters of the generator are dif- ferent, so the motor of the test stand needs to meet the detection requirements of How to cite this paper: Lv, H.L. and Luo,

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Laboratory Test Bench for Research  Network and Cloud Computing

Laboratory Test Bench for Research Network and Cloud Computing

In order to create a sequence of works, the real system, a method of network traffic generation and queries to a certain type of databases were studied, simulating the intensity at a given interval. This method is implemented in the form of a program consisting of two modules: “Generator” and “Activator”. In module “Generator” gen- eration of the files required size, defined on the basis of the analysis of statistics of the production network. In the module “Activator” a simulation was made based on previously generated data in the specified sequence after a

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Improvement of Electrical Near-Field Measurements with an Electro-Optic Test Bench

Improvement of Electrical Near-Field Measurements with an Electro-Optic Test Bench

Two different near-field techniques that we used were presented in this paper. First, the test bench and two kinds of probes were described, and then several characterizations of the EO probe were done. We saw that the actual EO probe gives interesting results thanks to the absence of intrusive effect unlike the two dipole probes. However, the bench still needs to be improved to characterize the spatial resolution. In the near future, this setup will be placed in a clean room to limit the influence of temperature on the polarization state of the laser beam. A second probe with a smaller crystal would also give better results by reducing the distance between the DUT and the crystal. We plan to work with a MO crystal, Yttrium iron garnet (YIG), to detect the magnetic field radiations. These data will then be included in a neural network simulation tools to reduce the number of points needed for a near-field scan and to improve the spatial resolution [24].
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UVM Based test bench to verify amba AXI4 slave protocol

UVM Based test bench to verify amba AXI4 slave protocol

Universal Verification Methodology (UVM) is used for functional verification of hardware or any system. Hardware or any system is written in Verilog, System c, VHDL or System Verilog at any abstraction level. Abstraction level may be behavioral or gate level or register transfer level. UVM is a simulation based verification methodology. UVM can also be used along with Assertion based verification or emulation. UVM is a constrained random coverage driven verification (CDV).CDV is a combination of automatically generation of test benches, self-checking of test benches and coverage metrics. The main aim of CDV is
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An Approach for Generating the Self Checking Test Bench

An Approach for Generating the Self Checking Test Bench

At the post-design level of confirmation for the HDL level verification which is done by means of HDL coding standard (HCS) which potentially records the dynamic timing simulation (DTS) and static timing simulation (STS) and essential examination which can be investigate with code coverage under design level test or the verification of design under test inside the element is done by means of device testing. Remember that all design or elements are required to confirm all FPGA necessities by test which is the genuine trail for the applicant [11].
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Calibration of a Single-Cell Calorimeter in a New Transient-state Test Bench

Calibration of a Single-Cell Calorimeter in a New Transient-state Test Bench

The calibration method of this type of sensor is very different from that of differential calorimeters. In fact, the differential calorimeters integrate heating element in each calorimetric cell, which allows the experimental simulation of an amount of energy, by means of the Joule effect, equivalent to the nuclear heating rate expected in the research reactor and lead to calibration curves by analysing thermal steady states. Therefore, single-cell calorimeters, that do not include heating elements, require other calibration methods. In this case, the calibration methods are based on the analysis of transient states. The processing of the temporal response curve allows the determination of the sensitivity of the sensor from a characteristic value corresponding to thermal time constant. This paper focuses on the experimental calibration of the KAROLINA calorimeter with a new transient-state test bench. More precisely, this paper begins by the analytical determination of the thermal time constant and the sensitivity of a single-cell calorimeter. Then a detailed presentation of the new transient-state test bench and its experimental protocol are performed. Finally, the experimental temporal response of KAROLINA calorimeter, obtained with this bench, is shown and preliminary studies of the influence of thermal and hydraulic external conditions on this response r and the calorimeter sensitivity are given.
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An in vitro test bench reproducing coronary blood flow signals

An in vitro test bench reproducing coronary blood flow signals

Background: It is a known fact that blood flow pattern and more specifically the pul- satile time variation of shear stress on the vascular wall play a key role in atherogenesis. The paper presents the conception, the building and the control of a new in vitro test bench that mimics the pulsatile flows behavior based on in vivo measurements. Methods: An in vitro cardiovascular simulator is alimented with in vivo constraints upstream and provided with further post-processing analysis downstream in order to mimic the pulsatile in vivo blood flow quantities. This real-time controlled system is designed to perform real pulsatile in vivo blood flow signals to study endothelial cells’ behavior under near physiological environment. The system is based on an internal model controller and a proportional-integral controller that controls a linear motor with customized piston pump, two proportional-integral controllers that control the mean flow rate and temperature of the medium. This configuration enables to mimic any resulting blood flow rate patterns between 40 and 700 ml/min. In order to feed the system with reliable periodic flow quantities in vivo measurements were performed. Data from five patients (1 female, 4 males; ages 44–63) were filtered and post-pro- cessed using the Newtonian Womersley’s solution. These resulting flow signals were compared with 2D axisymmetric, numerical simulation using a Carreau non-Newtonian model to validate the approximation of a Newtonian behavior.
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The Study of the Installation Angle of Anti hunting Dampers on Bench Test

The Study of the Installation Angle of Anti hunting Dampers on Bench Test

The anti-hunting damper is a rotary damping device installed longitudinally between the car body and the bogie, which is crucial for improving the stability, ride performance and critical speed of the vehicle. A lot of researches have been carried out on the anti-hunting damper at home and abroad. The literature [1] studied the influence of the damper rubber joint stiffness on the critical speed of the vehicle; the literature [2] and [3] studied the influence of anti-hunting damper on the train stability; the literature [4] studied the relationship between the anti-hunting damper and the ride quality of vehicle; the literature [5] and [6] studied the influence of the installation position and installation method of the anti-hunting damper on the dynamic performance of the train.; the literature [7] studied the problems related to the installation angle of anti-hunting damper through simulation. At present, there is little research and experimental verification on the relationship between the installation angle of anti-hunting damper and the dynamic performance of the high-speed trains. Therefore, this paper takes the EMU with two types of anti-hunting dampers as the objects, and testing on the rolling rig to study the influence of installation angle of the anti-hunting damper on the dynamic performance of the high-speed train.
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THE INFLUENCE OF STRUCTURAL FEATURES ON VIBRATION OF THE PROPELLER ENGINE TEST BENCH

THE INFLUENCE OF STRUCTURAL FEATURES ON VIBRATION OF THE PROPELLER ENGINE TEST BENCH

This range has been estimated according to the previous experiences in the research of multi cylinder airplane engines (Ostapski and Ponder, 2004; Ostapski 2011a). The most important are the first four vibration modes of the 4th cylinder as well as the first four vibration modes of the propeller shaft. The mentioned range should be extended downwards for measurements of the engine with one nonworking cylinder. For the presumed working speed range andgear ratio of the reducing gear i = 2.1, the frequency range should be 22-360 Hz. The first harmonics of the propeller shaft for speed n = 2800 rpm is f 1 = n/60 = 46.67 Hz, the fourth for speed n = 5400 rpm is f 4 = 4n/60 = 360 Hz. The first “propeller” harmonic frequency is: f 1s = n/60i = 2800/(2.1 · 60) = 22.2 Hz and the fourth one is f 4s = 4 · f 1s = 88.8 Hz. Accordingly, for the “take off” engine speed, the first harmonic frequency of the propeller shaft is f 1s = 5400/(2.1 · 60) = 42.85 Hz and the fourth is f 4s = 4 · f 1s = 171.4 Hz. Half speed frequencies may also appear. Various torsional rigidity of engine crankshafts, reducing gear, propeller shaft assembly, various values of gas pressure inside the cylinder and the propeller characteristic curve have significant influence on the vibration spectrum. It is very likely that torsional vibrations of the drive train with significant amplitudes will appear at the frequency range f = 22-360 Hz. For a particular engine, it will be also function of the rotation speed, load, and the combustion process control parameters. Analysis of simulation of vibration modes made on the test bench model using the FEM method shows difficulties with the “out-tuning”(avoiding mechanical resonance at all natural frequencies) of the test bench and engine torsional vibration frequencies in the operational range of the unit. The presented design variants (Fig. 19) may be a good way for “out-tuning” the test bench vibration frequencies of maximum amplitudes after first practical tests of the airplane drive assembly.
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Car Fuel Economy Simulation Forecast Method Based on CVT Efficiencies Measured from Bench Test

Car Fuel Economy Simulation Forecast Method Based on CVT Efficiencies Measured from Bench Test

they proposed a model for the effects. They validated their proposed model using a number of experimental data. Meanwhile, various transmission power losses of CVT have been analyzed, and the transmission efficien- cies of metal belts have been measured through bench tests [6]. However, the effects of CVT efficiency on car fuel economy have not yet been studied through real car tests. Huang et al. [7] conducted a CVT efficiency bench test using an electronically controlled gasoline engine as the power source, in which ratio, torque, and torque transmission ranges with high efficiency were measured. However, they did not validate the results using a real car test. In addition, researchers have investigated the influ- ences of gear precision, bearing fit quality, and gear oil in the gearbox on transmission efficiency. Wang et  al. [8] selected manual transmission as the research object to determine the influence of different gear precisions on transmission drive efficiency under various working conditions through bench tests. The results showed that a high-precision gear with a grinding process could evi- dently improve transmission drive efficiency. Gear preci- sion mainly influences mesh precision and transmission dynamic stability. Considerable work has been done to analyze the influence of different types of gear oil on transmission efficiency under various working conditions through bench tests [9–11]. Similarly, Zhu et  al. [12] studied the power loss of CVTs, including torque loss and speed loss, based on the transmission mechanism of CVTs, and experiments on CVT efficiency were con- ducted on a specific CVT test bench. Furthermore, they provided optimal structural parameters to serve as refer- ences for designing and tuning CVTs.
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A Simple Digital VHDL QPSK Modulator Designed Using CPLD/FPGAs for Biomedical Devices Applications

A Simple Digital VHDL QPSK Modulator Designed Using CPLD/FPGAs for Biomedical Devices Applications

We implemented a new simple direct QPSK digital modulator model in MATLAB/Simulink environment. It has been successfully designed with VHDL programming code by Altera development kit. The modulator generate QPSK signal directly from binary digital data. For test purpose it was generated with VHDL code inside the CPLD/FPGA, mapped for I / Q to control the carrier signal using VHDL multiplexer code. The output producing modulated digital signal, filtered to transmit through designed filters (LPF/BPF). Experimentally measurements were presented at carrier frequency 12.50 MHz; and data rate 2Mbps. Which presents better performance with high data rate and carrier suppression about ~ 40dB. The filter is main key in the design, eventually we designed and simulated for optimum passive filter for implant part, and comparing to the better filter performances. However, the simulation results given the better performance if we selected the BPF Chebyshev I & II types, comparing to others. On other hand the Butterworth LPF type gave optimum performance. The disadvantage of digital filter is it needs higher sampling frequencies which increase the consumption power and size. These are not considering in this work. Furthermore, additional work was done to test the proposed modulator over wireless inductive coupling, which gave better received data wirelessly up to 3Mbps over distance about 9.5cm. Eventually this technique can offer high transfer rate for biomedical devices requiring a high demand rate, such as electrodes information measured in real time, where the acquisitions data from electrodes are increasing form the neural system. Ultimately, in future work, it is also an intention to up-convert the signal into an ISM unlicensed frequency in UHF band (402~ 405 MHz). For biomedical telemetry applications, increasing the data rate with low noise and size reduced.
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WIRELESS SENSOR NETWORKS AND SIMULATION

WIRELESS SENSOR NETWORKS AND SIMULATION

Simulation is very important for the study of WSN. Simulation is the process of designing a model of a real system and conducting experiments to understand the behaviour of the system and/or evaluate various strategies for the operation of the system. The simulation result may not be accurate to predict the real behavior of wireless sensor network. Simulation is necessary to test the application and protocols.

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Simulation Model of Wireless Channel

Simulation Model of Wireless Channel

The change of channel is caused by Doppler effect, and the degree of change is related to relative velocity in the condition of the certain carrier frequency. The multipath fading channel is inde- pendent of each other, whose amplitude obeys Rayleigh distribution and the phase obeys uniform distribution. The model of multipath time-varying transmission channel is built. Through the pro- cess of channel model building, the simulation results produced by the channel model verify the effect of the proposed model in the aspect of reducing test data. In a communication system, signal passing through the channel is involved with the process of digital modulation and demodulation. Binary sequence signal is modulated into a complex sequence in the process of modulation before the transmission in the channel, in order to accommodate the wireless channel transmission. With the increase of SNR, BER is overall slightly drops. However there exists violent fluctuation and it presents the random variation of details in the multipath channel. I employ the mathematical model of multipath time-varying channel, i.e. Jakes model to be simulated so as to compare with the AGWN channel in the same situation. Jakes model has the characteristics of the reference chan- nel compared with the AGWN. BER does not change with the increase of SNR significantly and coincides with multipath time-varying channel. The BER considerably decreases with the increase of SNR in the AGWN channel.
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Study of a Pump as Turbine For a Hydraulic Urban Network Using a Tridimensional CFD Modeling Methodology

Study of a Pump as Turbine For a Hydraulic Urban Network Using a Tridimensional CFD Modeling Methodology

Furthermore, an experimental test bench was used to obtain the reverse mode pump characteristic, in terms of flow- rate/head.In both cases, the simulation model showed good accuracy, there is a low difference between simulated results and manufacturer/experimental data.The model results, which represents the first step of this activity, revealed that it is possibleto obtain the pump characteristic in reverse mode, which is not declared in the commercial pump datasheet.

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Design and Analysis of Composite Top Frame of Hydraulic Valve Test Bench

Design and Analysis of Composite Top Frame of Hydraulic Valve Test Bench

Top frame specially used to mount hydraulic cylinder of test bench for testing of various valves. The valves are mounted between top and bottom frames of test bench. Valve’s body, shell and seat are tested in hydraulic test bench. If the pressure is applied for the top side, then the top frame will have three through holes, the middle holes for cylinder’s ram movement and side tow holes are for guiding tie rod of test bench. By using tie rods the minimum and maximum distance (day-light) can be adjusted. The day-light can be adjusted by the movement of top or bottom frame of test bench and then they are tightened using fastener.
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ABSTRACT-- This paper targets heterogeneous low power

ABSTRACT-- This paper targets heterogeneous low power

Here, communication protocols play an important role, but considering the different layers of protocols independently and not taking into account adjacent layers as well as the hardware and environment, improvements can only be suboptimal [4]. PAWiS explicitly supports cross-layer design to exploit the synergy between layers. Several aspects regarding power aware wireless sensors are emphasized and directly supported by the PAWiS framework. The PAWiS framework hence helps to capture the whole system in one simulation and extracts power consumption figures from software and hardware modules uncovering leakages in early design stages. The main contributions of this work are as follows.
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A bench evaluation test for refrigeration oils in a refrigeration system using a screw compressor

A bench evaluation test for refrigeration oils in a refrigeration system using a screw compressor

Abstract: Refrigeration oil has a large effect on the performance of refrigeration systems. However, the physical and chemical indexes of fresh refrigeration oils often fail to reflect the actual operating characteristics, especially with respect to the degradation of refrigeration oils. In this paper, a bench evaluation test of refrigeration oils was carried out to investigate the degradation of synthetic refrigeration oils used with the refrigerant R134a, in a purpose-built, full-scale refrigeration system utilizing a screw compressor. To accelerate the degradation process of the refrigeration oil, the discharge temperature at the exit of the compressor was turned to a high level. Comparison tests of a mature refrigeration oil type A and a newly developed oil type B were performed under the same working conditions with 500 h of operating time. The performance of the screw compressor and refrigeration system was analyzed. The abrasion of the screw rotors and carbon deposition at the discharge port was investigated. Results showed that the bench evaluation test successfully predicted the degradation process of the refrigeration oils. The evolution analysis of the refrigeration oil viscosity and acid value during the bench evaluation test indicated that 15% of the physical and chemical indexes for refrigeration oil drain were too strict. Research work in this paper showed a more practical method to evaluate the performance of refrigeration oils through the bench evaluation test.
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Performance investigation of energy transport media as influenced by crop based properties

Performance investigation of energy transport media as influenced by crop based properties

Todays concern of protecting the environment has encouraged the research and the use of environmental friendly products. This project initiates the experimental investigation of using palm based oil as hydraulic fluid. This research was aimed at obtaining a better understanding of short term performance and long term durability of palm based oil working as hydraulic fluid. A vane pump test rig was designed and built. The instantaneous data were recorded in a computer using an analog-to-digital data acquisition system. The rig was integrated with LabVIEW software version 6.1. Among the data stored are reservoir and return line temperatures, suction and delivery pressures, instantaneous flow rate, total flow, total running time and torque. Test rig performance running on palm oil was determined and monitored. In order to predict the oil performance in the test rig operation, bench tests were also conducted in evaluating the thermal and rheological performance of the oil. The bench tests gave useful insight to the performance of the actual test rig. Some improvement of the oil was made and tested on the hydraulic test rig. The results indicate that ageing process was significantly improved by the additived oil. The investigation also indicates that flow slip, viscous friction, and coulomb friction coefficients were affected by oil and hydraulic component conditions. Non-Newtonian behavior of the oil had been analyzed using five rheological models. It was found that Cross and Carreau rheological models provided best correlation coefficient (R 2 > 0.999) to the oil under investigation. The palm oil had relatively strong shear thinning behavior with flow behavior index (n) lower than 0.8 compared to mineral hydraulic oil (n>0.9). However this effect was less pronounced at high temperatures. Modified power law and generalized models were proposed to study variation of Newtonian level of the oil with temperature and shear rate. Thermal stability of the oils was also investigated using thermogravimetry analysis (TGA). Based on thermodynamic activation energy (E a ), onset temperature and acid value, the recommended treat level for F10 additive
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