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About 196 papers for “Transient (computer programming)”
Eivind Kindingstad · Journal of the Hydraulics Division · 1964
Bergeron’s Method is adopted for solution of dynamic river flow problems. The mathematical model that is derived from elementary physical principles is well-suited for efficient digital computer programming. A Honeywell 290 process control computer was used in testing the model against past flow histories recorded on a major eastern river.
Cited by 1
Kesten, A. S., Smith, E. J. · NASA STI Repository (National Aeronautics and Space Administration)
Computer programming manual for calculating temperature and reactant concentrations as functions of time and axial position in catalyzed continuous flow hydrogen-oxygen reactors
Cited by 0Open access
E. J. Smith, A. S. Kesten · NASA Technical Reports Server (NASA) · 1971
Computer programming manual for calculating temperature and reactant concentrations as functions of time and axial position in catalyzed continuous flow hydrogen-oxygen reactors
Cited by 0
Li Liu, Ling Shao, Xuelong Li · 2015
Real-world scene recognition has been one of the most challenging research topics in computer vision, due to the tremendous intra-class variability and the wide range of scene categories. In this paper, we successfully apply an evolutionary methodology to au-tomatically synthesize domain-adaptive holistic descriptors for the task of scene recognition, instead of using hand-tuned descriptors. We address this as an optimization problem by using multi-objective genetic programming (MOGP). Specifically, a set of primitive op-erators and filters are first randomly assembled in the MOGP frame-work as tree-based combinations, which are then evaluated by t-wo objective fitness criteria i.e., the classification error and the tree complexity. Finally, the best-so-far solution selected by MOGP is regarded as the (near-)optimal feature descriptor for scene recog-nition. We have evaluated our approach on three realistic scene datasets: MIT urban and nature, SUN and UIUC Sport. Exper-imental results consistently show that our MOGP-generated de-scriptors achieve significantly higher recognition accuracies com-pared with state-of-the-art hand-crafted and machine-learned fea-tures.
Cited by 0
C. T. Kleiner, G. Kinoshita, E. Diane Johnson · IEEE Transactions on Nuclear Science · 1964
This paper demonstrates a technique of modeling semiconductor devices with a comrpatible circuit analysis program using an IBM 7094 digital computer and an S - C - 4020 for CRT display. The models and program contain means of simulating the effect of an ionizing radiation environment. Both modeling and programming are facilitated by the use of a general-purpose compiler and solver termed TRAC (Transient Radiation Analysis by Computer). Comparison between TRAC simulation and experimental test results demonstrate close agreement at the indicated radiation levels. Methods for determining the semiconductor device parameter values from test data are illustrated. Likewise, TRAC program capability is tabulated with a circuit example illustrating application of the technique. A brief description of "Equation Writing Capability" is included with an example of input data required for this option.
Cited by 11
Peters, Rodney · Central Queensland University · 2022
This thesis investigates the nature and magnitude of switching transient overvoltages that can be expected in inductively grounded underground coal mines. Computer models of power system equipment have been developed to analyse single-phase fault isolations; motor starts (including prestriking) and motor turn offs. The computer models that were developed have been validated against field recordings. The "Alternative Transients Program" (ATP) software was used to conduct the computer simulation studies. The underground substations used in Central Queensland coal mines are grounded through a Neutral Earthing Reactor (NER). The primary purpose of a NER is to limit earth fault currents. However, when a single -phase -to -ground fault occurs, energy is stored in the NER. Consequent to the isolation of such a fault, the energy stored in the NER is released. The release of this energy manifests itself as a transient overvoltage. This thesis investigates the effect of the rating of the NER and the value of the electric current at the instant of earth fault isolation on transient overvoltages. Two alternate earthing schemes were investigated in an attempt to reduce the severity of the transient overvoltages consequent to the isolation of earth faults. The first alternative that was investigated was the addition of a Resistor -Capacitor Snubber in parallel with a NER. Computer simulations indicate that the proper choice of Snubber parameters is very effective in reducing transient overvoltages following the isolation of earth faults. Consequently, a decision was made to manufacture a R -C Snubber and conduct field tests on the same. A summary of the field tests results has been included in the thesis. The other alternate grounding scheme that was investigated was the substitution of a Neutral Earthing Reactor with a Neutral Earthing Resistor. Computer simulations indicate that transient overvoltages following the isolation of earth faults are virtually eliminated if a Neutral Earthing Resistor is used. Consequent to this research work, the use of R -C Snubbers has become a recommended practice at various coal mine sites in Australia which use NER grounded, container type substations. The R -C Snubber is the preferred alternative at such installations as it is very compact and also eliminates the heating/reliability problems associated with resistance grounding. Vacuum contactors are used throughout the Central Queensland mines to frequently turn motors on and off. One of the most significant characteristics of vacuum contactors is their ability to interrupt high frequency currents. The consequence of this is that a considerable number of high frequency prestriking transients can be generated whenever a motor is turned on. These high frequency transients can lead to the premature aging of insulation. This thesis presents a computer model that was developed to simulate prestriking transients using the TACS (Transient Analysis of Control Systems) programming feature of the ATP software. Further investigation of prestriking transients was considered to be beyond the scope of the present research project. However, the unique TACS based prestriking model of a vacuum contactor that has been developed will be a useful tool for conducting further research.
Cited by 0Open access
Peters, Rodney · Figshare · 2024
This thesis investigates the nature and magnitude of switching transient overvoltages that can be expected in inductively grounded underground coal mines. Computer models of power system equipment have been developed to analyse single-phase fault isolations; motor starts (including prestriking) and motor turn offs. The computer models that were developed have been validated against field recordings. The "Alternative Transients Program" (ATP) software was used to conduct the computer simulation studies. The underground substations used in Central Queensland coal mines are grounded through a Neutral Earthing Reactor (NER). The primary purpose of a NER is to limit earth fault currents. However, when a single -phase -to -ground fault occurs, energy is stored in the NER. Consequent to the isolation of such a fault, the energy stored in the NER is released. The release of this energy manifests itself as a transient overvoltage. This thesis investigates the effect of the rating of the NER and the value of the electric current at the instant of earth fault isolation on transient overvoltages. Two alternate earthing schemes were investigated in an attempt to reduce the severity of the transient overvoltages consequent to the isolation of earth faults. The first alternative that was investigated was the addition of a Resistor -Capacitor Snubber in parallel with a NER. Computer simulations indicate that the proper choice of Snubber parameters is very effective in reducing transient overvoltages following the isolation of earth faults. Consequently, a decision was made to manufacture a R -C Snubber and conduct field tests on the same. A summary of the field tests results has been included in the thesis. The other alternate grounding scheme that was investigated was the substitution of a Neutral Earthing Reactor with a Neutral Earthing Resistor. Computer simulations indicate that transient overvoltages following the isolation of earth faults are virtually eliminated if a Neutral Earthing Resistor is used. Consequent to this research work, the use of R -C Snubbers has become a recommended practice at various coal mine sites in Australia which use NER grounded, container type substations. The R -C Snubber is the preferred alternative at such installations as it is very compact and also eliminates the heating/reliability problems associated with resistance grounding. Vacuum contactors are used throughout the Central Queensland mines to frequently turn motors on and off. One of the most significant characteristics of vacuum contactors is their ability to interrupt high frequency currents. The consequence of this is that a considerable number of high frequency prestriking transients can be generated whenever a motor is turned on. These high frequency transients can lead to the premature aging of insulation. This thesis presents a computer model that was developed to simulate prestriking transients using the TACS (Transient Analysis of Control Systems) programming feature of the ATP software. Further investigation of prestriking transients was considered to be beyond the scope of the present research project. However, the unique TACS based prestriking model of a vacuum contactor that has been developed will be a useful tool for conducting further research.
Cited by 0Open access
Peters, Rodney · Central Queensland University · 2024
This thesis investigates the nature and magnitude of switching transient overvoltages that can be expected in inductively grounded underground coal mines. Computer models of power system equipment have been developed to analyse single-phase fault isolations; motor starts (including prestriking) and motor turn offs. The computer models that were developed have been validated against field recordings. The "Alternative Transients Program" (ATP) software was used to conduct the computer simulation studies. The underground substations used in Central Queensland coal mines are grounded through a Neutral Earthing Reactor (NER). The primary purpose of a NER is to limit earth fault currents. However, when a single -phase -to -ground fault occurs, energy is stored in the NER. Consequent to the isolation of such a fault, the energy stored in the NER is released. The release of this energy manifests itself as a transient overvoltage. This thesis investigates the effect of the rating of the NER and the value of the electric current at the instant of earth fault isolation on transient overvoltages. Two alternate earthing schemes were investigated in an attempt to reduce the severity of the transient overvoltages consequent to the isolation of earth faults. The first alternative that was investigated was the addition of a Resistor -Capacitor Snubber in parallel with a NER. Computer simulations indicate that the proper choice of Snubber parameters is very effective in reducing transient overvoltages following the isolation of earth faults. Consequently, a decision was made to manufacture a R -C Snubber and conduct field tests on the same. A summary of the field tests results has been included in the thesis. The other alternate grounding scheme that was investigated was the substitution of a Neutral Earthing Reactor with a Neutral Earthing Resistor. Computer simulations indicate that transient overvoltages following the isolation of earth faults are virtually eliminated if a Neutral Earthing Resistor is used. Consequent to this research work, the use of R -C Snubbers has become a recommended practice at various coal mine sites in Australia which use NER grounded, container type substations. The R -C Snubber is the preferred alternative at such installations as it is very compact and also eliminates the heating/reliability problems associated with resistance grounding. Vacuum contactors are used throughout the Central Queensland mines to frequently turn motors on and off. One of the most significant characteristics of vacuum contactors is their ability to interrupt high frequency currents. The consequence of this is that a considerable number of high frequency prestriking transients can be generated whenever a motor is turned on. These high frequency transients can lead to the premature aging of insulation. This thesis presents a computer model that was developed to simulate prestriking transients using the TACS (Transient Analysis of Control Systems) programming feature of the ATP software. Further investigation of prestriking transients was considered to be beyond the scope of the present research project. However, the unique TACS based prestriking model of a vacuum contactor that has been developed will be a useful tool for conducting further research.
Cited by 0Open access
Daniel Mayer, Stanislav Kořínek, Mojmír Lindaur · Applications of Mathematics · 1967
In the submitted paper the algorithm for the analysis of the general electric circuit with lumped parameters in transient state is given. The algorithm for the loop currents method is formulated by means of matrix calculus. The obtained results show the possibility of describing the transient state by matrix equations. For their integration Runge-Kutte's numerical method in Merson's modification is used. On the basis of this algorithm a program for the complete analysis of the circuit by means of an automatic digital computer has been designed; this program is recorded in the programming language ALGOL 60. By means of the given program various electric curcuits on the computer National Elliott 803 have been solved.
Cited by 0Open access
J.H. McFadden, R.E. Narum, Craig E. Peterson et al. · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1984
RETRAN-02 represents a significant achievement in the development of a versatile and reliable computer program for use in best-estimate transient thermal-hydraulic analysis of LWR systems. The RETRAN-02 computer program is an extension of the RETRAN-01 program designed to provide analysis capabilities for: (1) BWR and PWR transients; (2) small-break loss-of-coolant accidents; (3) balance of plant modeling; and (4) anticipated transients without scram, while maintaining the analysis capabilities of the predecessor code. This report (the first of a four-volume computer code manual) describes the theory and numerical algorithms of the RETRAN-02 code. The three companion volumes describe the programming aspects, the programming details, and the verification and qualification performed with RETRAN.
Cited by 0
G. M. Dusinberre · Journal of Heat Transfer · 1959
This paper shows how transient temperatures in a cross-flow heat exchanger may be calculated by numerical methods. Digital computer programming is considered. A gas-turbine regenerator is used as an example. In particular, methods are developed which are useful when the flow rates vary, as in the starting transient.
Cited by 16
Shavit, Zeev · 2013
In the previous report, presented in Ref. 1, we considered the governing equations and physical parameters for metal droplet combustion in steam. A one dimensional (spherical) time-dependent model for burning process was proposed. In present report, we describe the implementation of that model in the general purpose computer code PHOENICS. This code can treat two phase transient flows in one or more space dimensions. Although we do not dwell on the specific of PHOENICS in this report, we describe in some detail the manner in which our model is incorporated into the code. The programming procedures are described via flow charts, list of variables and FORTRAN listing.
Cited by 0
Youssef Shatilla, A.F. Henry · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1993
This document constitutes Volume 1 of the Final Report of a three-year study supported by the special Research Grant Program for Nuclear Energy Research set up by the US Department of Energy. The original motivation for the work was to provide a fast and accurate computer program for the analysis of transients in heavy water or graphite-moderated reactors being considered as candidates for the New Production Reactor. Thus, part of the funding was by way of pass-through money from the Savannah River Laboratory. With this intent in mind, a three-dimensional (Hex-Z), general-energy-group transient, nodal code was created, programmed, and tested. In order to improve accuracy, correction terms, called {open_quotes}discontinuity factors,{close_quotes} were incorporated into the nodal equations. Ideal values of these factors force the nodal equations to provide node-integrated reaction rates and leakage rates across nodal surfaces that match exactly those edited from a more exact reference calculation. Since the exact reference solution is needed to compute the ideal discontinuity factors, the fact that they result in exact nodal equations would be of little practical interest were it not that approximate discontinuity factors, found at a greatly reduced cost, often yield very accurate results. For example, for light-water reactors, discontinuity factors found from two-dimensional, fine-mesh, multigroup transport solutions for two-dimensional cuts of a fuel assembly provide very accurate predictions of three-dimensional, full-core power distributions. The present document (volume 1) deals primarily with the specification, programming and testing of the three-dimensional, Hex-Z computer program. The program solves both the static (eigenvalue) and transient, general-energy-group, nodal equations corrected by user-supplied discontinuity factors.
Cited by 0Open access
H DeGarcia, R F Deshazer, Ray Levek et al. · Defense Technical Information Center (DTIC) · 1980
The report describes the continued development and test verification of digital computer models used to simulate hydraulic systems under dynamic conditions. A hydraulic acoustic generator was built and tested for frequency response work. Pulsation attenuation techniques are presented and several modifications were made to the Hydraulic Frequency Response Computer Program (HSFR) including a standing wave plot option. An empirical time domain pump model was developed and additional verification and development of the piston pump transient model was accomplished. Several enhancements were made to the Hydraulic Transient Analysis Computer Program (HYTRAN). A quasi-transient capability was added to the Steady State Flow Analysis Computer Program (SSFAN). The SSFAN Program was updated to extend the calculation capability, add new component models, program features, and reduce the program size. Several programming features were added to the Hydraulic Transient Thermal Analysis Computer Program (HYTTHA) including a temperature default section and environment section. Further verification work was accomplished on the HYTTHA program.
Cited by 0
Wang, B. P., Yoo, Y., Clark, B. et al. · NASA STI Repository (National Aeronautics and Space Administration)
A description and applications of a computer capability for determining the ultimate optimal behavior of a dynamically loaded structural-mechanical system are presented. This capability provides characteristics of the theoretically best, or limiting, design concept according to response criteria dictated by design requirements. Equations of motion of the system in first or second order form include incompletely specified elements whose characteristics are determined in the optimization of one or more performance indices subject to the response criteria in the form of constraints. The system is subject to deterministic transient inputs, and the computer capability is designed to operate with a large linear programming on-the-shelf software package which performs the desired optimization. The report contains user-oriented program documentation in engineering, problem-oriented form. Applications cover a wide variety of dynamics problems including those associated with such diverse configurations as a missile-silo system, impacting freight cars, and an aircraft ride control system.
Cited by 0Open access
W. D. Pilkey, B. P. Wang, Young-Joon Yoo et al. · 1973
A description and applications of a computer capability for determining the ultimate optimal behavior of a dynamically loaded structural-mechanical system are presented. This capability provides characteristics of the theoretically best, or limiting, design concept according to response criteria dictated by design requirements. Equations of motion of the system in first or second order form include incompletely specified elements whose characteristics are determined in the optimization of one or more performance indices subject to the response criteria in the form of constraints. The system is subject to deterministic transient inputs, and the computer capability is designed to operate with a large linear programming on-the-shelf software package which performs the desired optimization. The report contains user-oriented program documentation in engineering, problem-oriented form. Applications cover a wide variety of dynamics problems including those associated with such diverse configurations as a missile-silo system, impacting freight cars, and an aircraft ride control system.
Cited by 1
Victor Winter, Mahadevan Subramaniam · Science of Computer Programming · 2004
Cited by 25
N.D. Rao, H. N. Ramachandra Rao · Proceedings of the Institution of Electrical Engineers · 1964
The paper presents a numerical method for the solution of transient-stability problems utilising the number-series approach. Significant generator characteristics which are normally neglected, such as transient saliency, field decrement and damping, are included in the transient-stability study. The swing equation is arranged in a block-schematic form separating the linear and nonlinear parts. Data for the swing curve are obtained from convolution of the impulse response of the linear block with its input; the convolution integral is evaluated by standard numerical methods such as the trapezoidal and Simpson's rules.Rational bases are presented for the selection of a suitable time increment for a specified accuracy. The results obtained by the number-series method are compared with those of the fourth-order Runge-Kutta method. Finally, general hints and suggestions are given for programming the number-series method on a digital computer.
Cited by 3
Kwang-Ping Yang, Tung Liang, I-Pai Wu · Journal of the Hydraulics Division · 1975
The capability of a dynamic programming conduit design technique was expanded to cover systems with diverging branch pipelines. An interactive computer programming approach was used in optimization. Optimization design is valid with little restriction. Design applies to complete turbulent, transient, as well as laminar, flow conditions. The decision variable, pipe size, assumes only pipe sizes that are available on the market.
Cited by 35
Peng Zhan, Shujun Yao, Hailin Zhang et al. · The Journal of Engineering · 2017
The traditional electromagnetic transient simulation has a short‐step size and a large computation, which results in small‐scale simulation. Multi‐rate simulation method and parallel computing are combined to carry out multi‐rate simulation on the basis of parallel processing of power network, which can further improve the computational efficiency and expand the simulation scale. At the same time, a multi‐rate simulation method of rotational frequency reduction is proposed. In which short step is used for the parts that want detailed simulation, for the AC network part, large step is adopted to the simulation and the frequency is reduced by the rotation of the signal for each phase. The wide application of multi‐core central processing unit (CPU) computer is a great change that is being carried out. This paper develops the multi‐thread programming based on open multi‐processing (MP), makes full use of the convenience of multi‐core CPU computer and simulates the method proposed.
Cited by 4Open access