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Academic literature on the topic 'Simulation accuracy in power engineering'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Simulation accuracy in power engineering"

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Zheng, Hui Ping, Min Xue, Yan Zhao, Xin Yuan Liu, and Yu Han. "A Comprehensive Evaluation Method on Dynamic Simulation Accuracy of Power System." Applied Mechanics and Materials 541-542 (March 2014): 869–74. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.869.

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In order to overcome the shortcomings of the present accuracy assessment methods of power system dynamic simulation, this paper focuses the permanent single phase short-circuit fault which occurs in a large probability in power grids,and selects the typical electrical quantities which is very concerned in engineering after the fault happened. A time-scale based error criteria on simulation validation is proposed, and a comprehensive error criteria according to the average errors between simulation data and actual data is proposed to evaluate objectively the simulation accuracy of the typical electrical quantities. Considering the variation characteristics of the electrical quantities, the simulation accuracy evaluation of a single electrical element is expended to the simulation accuracy evaluation of the entire network, so not only the comprehensive evaluation about the model and its parameters but also the information for model modification and parameter correction can be obtained. The effectiveness of the proposed method is verified by the numerical results on the New England 10 Unit 39 Bus powers system.
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Bu, Jing, and Ning Qiang Jiang. "Analysis of Power System’s Critical Damping." Advanced Materials Research 219-220 (March 2011): 586–90. http://dx.doi.org/10.4028/www.scientific.net/amr.219-220.586.

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In this paper, the analytical formulations among the damping factor and the other parameters are studied by Melnikov method for the classic second-order model of power system. The proximity of Melnikov method is analyzed by comparison between the obtained critical damping factor with the result by time-domain simulation method. It points out that this method exist great error in the range of engineering application. To solve this problem, an improved method is proposed to calculate the critical damping factor based on RBFNN. Finally, simulations show that it can effectively improve the calculation accuracy.
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Jin, Ge, Shu Chang Liu, and Ding Cai. "Research of Turbine Model Accuracy Based on Actual Data." Advanced Materials Research 960-961 (June 2014): 1424–28. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.1424.

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In the present power system stability analysis, BPA model for turbine and governor is commonly used. It simplifies the actual turbine system to a large extent, therefore the model simulation results may deviate from the actual conditions. In order to improve the actual data simulation accuracy, this paper compared the real and simulation data of power, high pressure cylinder (HPC) exhaust pressure and reheat pressure. Then calibrated and optimized the established model using the data of field operation. Meanwhile, the model modified method using actual data is given and guidance of parameters tests is offered.
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Li, Lan, Yong Hui He, and Bo Wang. "Comparison of Methods of Maximum Power Point Tracking of Photovoltaic Cells." Applied Mechanics and Materials 380-384 (August 2013): 3362–65. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3362.

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According to engineering mathematics model of solar photovoltaic cells, a simulation model of photovoltaic cells was established in Matlab. In view of problem that it is difficult to get higher tracking accuracy and response speed by use of perturbation and observation method which applied fixed perturbation step, the paper proposed an improved perturbation and observation method based on variable step. Through simulating photovoltaic cells control system, simulation curves of two kinds of methods of maximum power point tracking were compared. The simulation results show that the photovoltaic cells control system can track maximum power point more quickly and has better stability at the maximum power point by use of the improved perturbation and observation method.
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Tant, Jeroen, and Johan Driesen. "On the Numerical Accuracy of Electromagnetic Transient Simulation With Power Electronics." IEEE Transactions on Power Delivery 33, no. 5 (October 2018): 2492–501. http://dx.doi.org/10.1109/tpwrd.2018.2797259.

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Frivaldsky, Michal, Jan Morgos, Michal Prazenica, and Kristian Takacs. "System Level Simulation of Microgrid Power Electronic Systems." Electronics 10, no. 6 (March 10, 2021): 644. http://dx.doi.org/10.3390/electronics10060644.

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In this paper, we describe a procedure for designing an accurate simulation model using a price-wised linear approach referred to as the power semiconductor converters of a DC microgrid concept. Initially, the selection of topologies of individual power stage blocs are identified. Due to the requirements for verifying the accuracy of the simulation model, physical samples of power converters are realized with a power ratio of 1:10. The focus was on optimization of operational parameters such as real-time behavior (variable waveforms within a time domain), efficiency, and the voltage/current ripples. The approach was compared to real-time operation and efficiency performance was evaluated showing the accuracy and suitability of the presented approach. The results show the potential for developing complex smart grid simulation models, with a high level of accuracy, and thus the possibility to investigate various operational scenarios and the impact of power converter characteristics on the performance of a smart gird. Two possible operational scenarios of the proposed smart grid concept are evaluated and demonstrate that an accurate hardware-in-the-loop (HIL) system can be designed.
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Pollmeier, K., C. R. Burrows, and K. A. Edge. "Partitioned Simulation of Fluid Power Systems—an Approach for Reduced Communication between Processors." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 210, no. 4 (November 1996): 221–30. http://dx.doi.org/10.1243/pime_proc_1996_210_461_02.

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Parallel simulation of fluid power systems using the transmission line modelling method offers the benefit of increased speed of execution, but requires the system model to be partitioned on to individual processors. Fluid power systems are characterized by a transport delay in the pipelines connecting physical components, which allows component models to be decoupled; this leads to simulations involving frequent interprocessor communication and low computational performance. This paper describes a method that enables faster simulations by reducing the communication bottleneck. By adjusting the line impedance it is possible to use a larger time step for the communication between processors than the global time step. This approach requires a new filter for the approximation of frequency-dependent friction. Potential gains and the accuracy of the method are estimated. A hydraulic example circuit is partitioned in two subsystems and the new scheme leads to valuable reductions in run time without compromising accuracy.
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Malik, N. H., and A. A. Al-Arainy. "Capacitance Calculation of Three Core Belted Power Cables." International Journal of Electrical Engineering & Education 25, no. 1 (January 1988): 27–32. http://dx.doi.org/10.1177/002072098802500107.

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Based on charge simulation technique for solving the electrostatic field problems, a method to compute the capacitance of three core belted power cables is discussed. It is shown that very accurate capacitance calculations are possible if an appropriate number of simulating charges are used. Furthermore, the factors which influence the accuracy of such computations are analyzed.
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Dinkelbach, Jan, Ghassen Nakti, Markus Mirz, and Antonello Monti. "Simulation of Low Inertia Power Systems Based on Shifted Frequency Analysis." Energies 14, no. 7 (March 27, 2021): 1860. http://dx.doi.org/10.3390/en14071860.

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New types of power system transients with lower time constants are emerging due to the replacement of synchronous generation with converter interfaced generation and are challenging the modeling approaches conventionally applied in power system simulation. Quasi-stationary simulations are based on classical phasor models, whereas EMT simulations calculate the instantaneous values of models in the time domain. In addition to these conventional modeling approaches, this paper investigates simulation based on dynamic phasor models, as has been proposed by the Shifted Frequency Analysis. The simulation accuracy of the three modeling approaches was analyzed for characteristic transients from the electromagnetic to the electromechanical phenomena range, including converter control as well as low inertia transients. The analysis was carried out for systems with converter interfaced and synchronous generation whilst considering the simulation step size as a crucial influence parameter. The results show that simulations based on dynamic phasors allow for larger step sizes than simulations that calculate the instantaneous values in the time domain. This can facilitate the simulation of more complex component models and larger grid sizes. In addition, with dynamic phasors, more accurate simulation results were obtained than with classical phasors, in particular—but not exclusively—in a low inertia case. Overall, the presented work demonstrates that dynamic phasors can enable fast and accurate simulations during the transition to low inertia power systems.
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Nohacova, Lucie, and Karel Nohac. "Dynast – Computer Program Used in Power Engineering." Applied Mechanics and Materials 284-287 (January 2013): 1035–38. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1035.

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There are relatively insufficient quality specialized modeling tools for power engineering. Regardless there are few possibilities how to simulate main elements of electric network and systems consisting of them. Beside most used specialized tool EMTP-ATP there is MATLAB with its Simulink library SimPowerSystems and newly also DYNAST with its own growing library of power engineering elements. There are also many other general simulation tools with libraries of elements suitable for power engineering. Therefore there seems to be opportunity to compare quality of mentioned tools in accuracy, reliability, speed and flexibility in high demanding problems. Branch “Power engineering” is very specific, because there is necessary in most cases to simulate multiple technical disciplines. Not only electrical network is to solve, but also connection with mechanical equipment and other devices of power engineering. One of the most powerful tools that meet all these requirements is Dynast. Now new library for electric components was developed to make creation of model easy and fast.
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Dissertations / Theses on the topic "Simulation accuracy in power engineering"

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Mesbahi, Abdessamad. "Deterministic and Stochastic Economic Modeling of Hybrid Power Supply System with Photovoltaic Generators." Master's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/42555.

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Relevance of research. Due to the rapid deployment of the non-dispatchable (intermittent) generation sources in the smart grid, such as integration of the photovoltaic power plants and wind turbines in the distribution systems; this caused a problem of the uncertainty increase of simulation results for decision-making for power supply systems, these uncertainties of power systems are getting more and more notice. At the same time, the classical power systems models cannot give accurate simulation results. Wherein; it became necessary to define new models to represent the specific parameters of power system. wherein; this research reveals to the benefits of using probabilistic mathematical approaches to define and calculate the specific economic parameters, as well as the technical parameters for power supply system with the integration renewable energy generators, which are characterising by randomness and uncertainty due to the high penetration to the renewables. Monte Carlo Method, and Point Estimation Method are used to handle the uncertainties of renewable energy resources. The standard functions to represent the stochastic parameters of the model are analyzed with the use of three-point estimation technique for the distribution functions of their probable values. A synthetic skewed probability density function was analytically constructed basing on the standard normal distribution, which is suitable for analytic representation of the predicted and/or statistical random sampling of the uncertain model parameters of energy system with renewables, and analytical expressions were obtained to compute the moments of proposed synthetic probability function. Relationship of work with scientific programs, plans, themes. is to demonstrate the possibility of describing the input parameters of the simulation Deterministic and Stochastic Modeling by probability Density Functions by the use of three-point approximation techniques and to obtain analytical expressions for the characteristics of such distributions, suitable for non-iterative (as opposed to Monte Carlo Method) probabilistic method applications, namely the Point Estimation Method. Purpose and tasks of the research. Increasing the simulation accuracy results for estimation economic and technical parameters characterising photovoltaic power plant based on based on the life cycle model; as well as development of different algorithms based on deterministic and stochastic modeling of power system with non-dispatchable sources and minimize the computation time. Object of research. Processes of determining the estimated technical and economic parameters characterising a photovoltaic power plant located in Ukraine basing on stochastic modeling. Subject of research. Use of the Monte Carlo Method and Point Estimation Method to estimate the various economic and technical information characteristic of alternative power plants in order to obtain accurate simulation results. Practical value of the results. Practical techniques of the three-point approximation are used to construct the probability density function of the model uncertain (stochastic) parameter, which dominantly influences the modeling result: an event occurrence probability, the result attainability, whatsoever. This technique is an effective tool for the practical evaluating of an uncertain value of a technological or economic factor of material and/or economic object, and widely used for overall Levelized Energy Cost (LCOE – LEC) which is directly or indirectly engaged into analytic representation of the power systel model. Usually, the model of a kind is designed to solve technical and/or economic problem by means of Deterministic and Stochastic Modeling. Scientific novelty of the obtained results is the development of algorithms and mathematical solutions using a probabilistic approach basing Point Estimation Method instead of Monte Carlo Melthod to obtain more accurate estimation simulation results, as well as to obtain computational results in less time for useful decision-making in alternative power plant projects.
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Jarmander, Sara. "Wind Power Forecast Accuracy in Scandinavia:Analysis of Forecast Errors Using TAPM." Thesis, KTH, Kraft- och värmeteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226146.

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Wind power has different characteristics compared to conventional energy sources. The main difference is that wind power fluctuates under the influence of meteorological variables. This gives rise to problems related to grid stability. It is therefore important to understand these variations and their predictability in order to improve the integration of wind power into grids. Wind power forecasts play an important role. In this study, the accuracy of Numerical Weather Prediction (NWP) wind speed forecasts over the period 1st Sept. 2013 – 31st Dec. 2016 has been investigated. This was done for four Scandinavian windfarms; Rødsand II, Kårehamn, Jokkmokksliden and Storliden.   The NWP used was The Air Pollution Model (TAPM). The main aim of the study was to examine if the implementation of bias correction methodologies could improve the accuracy of uncorrected TAPMforecasts. In addition to this main aim, the study was also intended to investigate the differences in the performance of TAPM between Australian and Scandinavian weather conditions.   The results indicated that TAPM has a tendency to under-predict against actual observations. It was also observed that the accuracy varied throughout the year, with the best performance during summer and the worst during winter. Additionally, the performance varied between turbines within the wind farms. The magnitude of forecast errors was lowest for turbines which experience high degrees of wake effects from upstream turbines. Furthermore, the results showed that the implementation of certain bias correction methodologies improved the accuracy. The greatest enhancements were achieved by the implementation of two correction methodologies, both based on the combination of bias correction and timing correction. The NRMSE of wind speed was reduced by almost 50% for “hour ahead” forecasts for Rødsand II and Kårehamn when full bias correction was applied and by nearly 70% for Jokkmokksliden and Storliden. A reduction in the wind speed magnitude error by as much as half was also reached.   Based on these results, the overall conclusion is that TAPM can be applied for sites with completely different weather conditions with moderately good accurateness, especially if bias correction is applied. However, due to the limited time frame and other delimitations of this study, further studies are necessary in order to draw deeper conclusions.
Vindkraft är en förnybar energikälla som skiljer sig på flera sätt jämfört med konventionell energiproduktion. Konvensionell produktion avser planerbar och icke väderberoende energiproduktion som dessutom är synkront kopplad till elnätet, exempelvis vattenkraft och kärnkraft. Den huvudsakliga skillnaden är att energiproduktionen från vindkraftverk är direkt kopplad till meteorologiska förhållanden och är därmed beroende av de rätta väderbetingelserna för att kunna producera el, framförallt rådande vindhastigheter. Detta innebär att elproduktionen varierar på ett oförutsägbart sätt vilket medför att den producerade elkraften från vindkraftverk är mindre stabil jämfört med elkraft som utnyttjar konventionells krafttekniker.   En ökad andel variabel elproduktion från vindkraft medför stora utmaningar för det befintliga och framtida kraftsystemet. Den främsta utmaningen är att upprätthålla balansen i systemet, både i det korta och långa tidsperspektivet. Om inga åtgärder genomförs förväntas kraftsystemets utformning och egenskaper att bli sämre i form av ökad känslighet för störningar och försämrad leveranstid. En ökad förståelse för vindkraftsproduktionens variabilitet och förutsägbarhet är därmed av intresse för att kunna förbättra integrationen av variabel vindkraftsproduktion. Prognosmodeller för vindkraftsproduktion (analogt med prognoer för vindhastighet) utgör en viktig faktor i detta. I denna studie har noggrannheten av numeriska väderprognoser (NWP) analyserats. Analysen genomfördes för fyra skandinaviska vindkraftparker mellan 1 september 2013 och 31 december 2016. De granskade parkerna var: Rødsand II, Kårehamn, Jokkmokksliden och Storliden.   Den numeriska prognosmodell som används i denna studie var The Air Pollution Model (TAPM). TAPM utvecklades i Australien och modellen bygger på observationsbaserade meterologiska input. TAPM är i själva verket ansluten till globala databaser med struktuerad meterologisk data bestående av bland annat terränghöjd, vegetation och synoptisk metrologisk information. TAPM har tidigare tillämpats för att förutspå vindhastigheter för ett flertal vindkraftparker i Australien och ett antal platser i USA. Inga tidigare studier har dock gjorts för scandinaviska förhållanden. Det huvudsakliga målet med denna studie var därmed att undersöka huruvida biaskorrigerade metoder kan förbättra noggrannheten av okorrigerade TAPMprognoser för de fyra utvalda vindkraftparkerna. Denna studie avsåg även att undersöka om prognosernas noggrannhet skiljer sig nämnvärt mellan skandinaviska och australienska väderförhållanden.   Numeriska modeller innehåller alltid fel jämför med de ”sanna” värdena. Resultatet av denna studie indikerade att TAPM-prognoserna har en tendens att underskatta vindhastigheter, därmed även vindkraftsproduktionen gentemot den verkliga produktionen. Dessutom observerades att prognosernas noggrannhet varierade under året. Den bästa tillförlitligheten erhölls under vintern och den sämsta tillförlitligheten under sommarhalvåret. Vidare varierade prognosernas noggrannhet mellan turbinerna inom de enskilda vindkraftparkerna. Storleken på felet i TAPMprognoserna var generellt sett lägst för turbiner som utsetts för så kallade vakar. Vakar är ett fenomen som uppstår bakom rotorbladen och påverkar energiproduktionen för bakomliggande vindkraftverk. Storleken på felet var lägst för turbiner som i stor utsträckning påverkas av vakar från turbiner uppströms.   Resultatet visade även att implementeringen av biaskorrigerande metoder förbättrade noggrannheten av TAPM-prognoserna. Sammantaget undersöktes fyra biaskorrigerande metoder varav två uppvisade de största förbättringarna. Gemensamt för dessa två metoder var att de baserades på en kombination av biaskorrigering och tidskorrigering.   Olika statistiska metoder användes för att uppskatta storleken av felet för den förutspådda vindhastigheten som modellerats i TAPM. Bland annat användes Root Mean Square Error (RMSE), Mean Absolute Error (MAE) och Mean Bias Error (MBE). Dessa värden normaliserades därefter med avseende på medelvärdet av den verkliga produktionen för önskad tidsperiod. Resultatet visade bland annat att NRMSE för TAPM-modellerade timvisa vindhastigheter minskade med nästan 50 % för Rødsand II och Kårehamn när full biaskorrektion tillämpades och med uppemot 70 % för Jokkmokksliden och Storliden.   Med utgångspunkt från de erhållna resultaten är den övergripande slutsatsen att TAPM kan tillämpas för geografiska platser med olika väderförhållanden och samtidigt generera prognoser med relativt god noggrannhet, speciellt om biaskorrigerade metoder appliceras. Till följd av den begränsande tidsramen och andra avgränsningar i denna studie är dock ytterligare analyser nödvändiga för att dra djupare slutsatser.
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McCoy, Timothy J. (Timothy John). "Dynamic simulation of shipboard electric power systems." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12495.

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Bras, Johan J. "A simulation of the single scan accuracy of a two-dimensional pulsed surveillance radar." Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/8460.

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Bibliography: leaves 194-198.
The following dissertation considers the single-scan two-dimensional positional accuracy of a pulsed surveillance radar. The theoretical aspects to the positional accuracy are considered and a generalized analytical approach is presented. Practical position estimators are often complex, and theoretical predictions of their performance generally yield unfriendly mathematical equations. In order to evaluate the performance of these estimators, a simulation method is described based on replicating the received video signal. The accuracy of such a simulation is determined largely by the accuracy of the models applied, and these are considered in detail. Different azimuth estimation techniques are described, and their performances are evaluated with the aid of the signal simulation. The best azimuth accuracy performance is obtained with the class of analogue processing estimators, but they are found to be more susceptible to interference than their binary processing counterparts. The class of binary processing estimators offer easily implemented techniques which are relatively insensitive to radar cross-section scintillation characteristics. A hybrid estimator, using both analogue and binary processing, is also evaluated and found to give an improved accuracy performance over the binary processing method while still maintaining the relative insensitivity to radar cross-section fluctuation.
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Picard, Yani. "Improving the precision and accuracy of Monte Carlo simulation in positron emission tomography." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68241.

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PETSIM, a Monte Carlo simulation program of Positron Emission Tomography (PET) systems, was improved in terms of accuracy and efficiency. First, the accuracy, the speed and the ease of use of PETSIM were improved by using tabulated values of the Compton scattering and photoelectric absorption partial interaction attenuation coefficients for all common biological, collimator and detector materials. These were generated from chemical formula, or physical composition, and density of the absorbing medium.
Furthermore, simulations of PET systems waste considerable time generating events which will never be detected. For events in which the original photons are usually directed towards the detectors, the efficiency of the simulations was improved by giving the photons additional chances of being detected. For simulation programs which cascade the simulation process into source, collimation, and detection phases such as PETSIM, the additional detections resulted in an improvement in the simulation precision without requiring larger files of events from the source/phantom phase of the simulation. This also reduced the simulation time since fewer positron annihilations were needed to achieve a given statistical precision. This was shown to be a useful improvement over conventional Monte Carlo simulations of PET systems.
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Ramos, Calderón Antonio José. "Computational and accuracy benchmarking of simulation and system-theoretic models for production systems engineering." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-19877.

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The modern industry has an increasing demand for simulation software able to help workers and decision-makers visualize the outputs of a specific process in a fast, accurate way. In this report, a comparative study between FACTS (Factory Analyses in ConcepTual phase using Simulation), Plant Simulation, and PSE (Production System Engineering) Toolbox is done regarding their capacity to simulate models with increasing complexity, how accurate they are in their outputs with different optimized buffer allocations, and how well they perform on the task of detecting the bottlenecks of a process. Benchmarking simulation software requires an experimental approach, and for gathering and organizing all the data generated using external programs like MATLAB, C, Excel, and R are used. A high level of automatization is required as otherwise the manual input of data would take too long to be effective.The results conclude on major concordances among FACTS and Plant Simulation as the most used commercial DES (Discrete Event Simulation) software and a more mathematical-theoretical approach coming from PSE Toolbox. The optimization done in the report links to sustainability, with an enhanced TH improving the ecological, social and economic aspects, and to Lean philosophy using lean buffers that smooth and improve the production flow.
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Khalil, Louay. "LoRa-positioning in Malmö compared with GPS: possibilities, power consumption & accuracy." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20479.

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Internet of Things, blir allt större för varje dag och talas om överallt där teknik är närvarande.Större företag implementerar idéer och lösningar som är bundna till IoT, ochmindre företag följer trenden med att följa tekniska lösningar med låg strömförbrukningoch långsiktig täckning av signal. LoRaWAN möjliggör just det och utvecklas mycketsnabbt för bättre användning och bättre lösningar. Numera utvecklar och forskar företagenmycket i lösningar för smarta spårningsobjekt och i detta dokument byggs en prototypför att spåra stulna cyklar där positionsspårning experimenteras med. GPS-spårning jämförsmed LoRaWAN-spårning efter att en prototyp har byggts och utformats för att spåraen stulen cykel med båda lösningarna. Syftet med denna avhandling är att visa hur ensådan prototyp kan byggas och vad resultaten är mellan GPS-spårningen och LoRaWANspårningen.Detta koncept ger en förståelse av hur långt utvecklingen av LoRaWAN-näthar nått i en stad som Malmö i Sverige. Ena fallscenariot visar resultat av prototypensenergiförbrukning utan att cykeln stulits. Ett andra scenario visar när cykeln är stulen ochpresenterar skillnaderna i strömförbrukningen och lokaliseringens noggrannhet. I scenario1 GPS-positionering varar i 12 dagar medan LoRaWAN-positionering varar 14 dagar. Iscenario 2 är resultaten 9 dagar mot 14 dagar för GPS gentemot LoRaWAN.
Internet of Things is becoming bigger for each day and is talked about everywhere technologyis present. Major companies are implementing ideas and solutions bound to theIoT and smaller companies are following the trend in pursuing technological solutions withlow power consumption and long range coverage of signal. LoRaWAN enables just thatand is getting developed very fast for better usage and better solutions. Nowadays, companiesdevelop and research a lot in solutions for smart tracking objects and in this papera prototype to track stolen bicycles is built where tracking is experimented with. GPStrackingis compared to LoRaWAN-tracking after a prototype is been built and designedto track a stolen bicycle with both solutions. The aim for this thesis is to show how suchprototype can be built and what the results are between GPS-tracking and LoRaWANtracking.This concept gives an understanding of how far the development of LoRaWANnetworks has reached in a city like Malmö in Sweden. One case scenario shows results ofthe prototype used in reality without having the bicycle stolen. A second scenario showswhen the bicycle is stolen and presents the differences in the results of power consumptionand accuracy of localization. In case scenario 1 GPS-positioning lasts for 12 days whileLoRaWAN-positioning lasts 14 days. In case scenario 2 the results are 9 days against 14days.
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Beatty, Debra Ann Kemnitz. "Simulation of a family of DC-to-DC power supplies." Honors in the Major Thesis, University of Central Florida, 1995. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/137.

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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.
Bachelors
Engineering
Electrical Engineering
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Jaworsky, Christina A. "The effects of energy storage properties and forecast accuracy on mitigating variability in wind power generation." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81605.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 84-87).
Electricity generation from wind power is increasing worldwide. Wind power can offset traditional fossil fuel generators which is beneficial to the environment. However, wind generation is unpredictable. Wind speeds have minute to minute variability which causes minute to minute generation to fluctuate. Additionally, wind forecasting does not perfectly predict wind generation, so it is difficult for wind to meet a generation schedule. Therefore, with increased wind production, there is a need for flexibility in the electricity grid. Electricity storage is one method of achieving greater flexibility. With storage, wind generators can have a less variable power output. They can also be made to follow a generation schedule the same way traditional generation does. This study discusses the storage requirements for reducing the variability of wind power. It also assesses the value of an accurate forecast in terms of storage requirements. Storage capacity requirements are shown to be modest compared to the size of a generator, representing approximately one minute of full power generation capacity. Accurate forecasting can reduce the storage requirements of a wind generator. However, forecasts have little added value for greater accuracy beyond correctly predicting the mean of the wind generation on delivery scheduling intervals.
by Christina A. Jaworsky.
S.M.
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Chan, Chunwa. "Design, simulation and analysis of RESURF Si/SiC power LDMOSFETs." Thesis, University of Warwick, 2018. http://wrap.warwick.ac.uk/102005/.

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It is necessary for power laterally diffused MOSFETs (LDMOSFETs) to operate efficiently and reliably in high temperature (< 300 °C), hostile environments such as those found in downhole, space, automotive and aerospace applications. Currently, silicon-oninsulator (SOI) technology is a dominant method to achieve this goal due to low leakage current and complete electrical isolation. However, the buried oxide (BOX) layer causes self-heating, which can impact device performance, cause thermal runaway and shorten device lifetime. To address this issue, one solution is to combine a silicon thin film with a semi-insulating (SI) SiC substrate, forming the Si/SiC architecture. LDMOSFETs built on this substrate are expected to deliver much better thermal performance, with electrical isolation comparable to the SOI case. However, the Si/SiC LDMOSFETs do not have a strong substrate assisted depletion effect, which can result in poorer electrical performance than those of the Reduced Surface Field (RESURF) bulk-Si and SOI LDMOSFETs. This thesis investigates the PN and SOI RESURF layouts and uses them to optimise 190 V and 600 V Si/SiC LDMOSFETs. DC and transient modelling will be conducted on the optimised Si/SiC and their SOI and bulk-Si equivalents. Based upon this, several comparative studies are conducted on their simulation results to see the effects of the Si/SiC architecture on the LDMOS designs. The comparative studies are made on the 600 V Si/SiC LDMOSFETs and their bulk Si and SOI equivalents. It is shown that the Si/SiC devices have the potential to operate with an off-state leakage current as low as the SOI device. However, the low-side resistance of the SOI LDMOSFET is smaller in value and less sensitive to temperature, outperforming both Si/SiC devices. Conversely, under high-side configurations, the Si/SiC transistors have resistances lower than that of the SOI at high substrate bias, and invariable with substrate potential up to −200 V, which behaves similar to the bulk-Si LDMOS at 300 K. A clamped-inductive switching circuit is simulated for the Philips SOI and the Si/SiC equivalent. It is shown that even though the SOI has a smaller chip area and suffered from strong substrate effects during the transient state, the two devices had similar currents and power dissipations at the gate, drain and source. The turn-on losses are higher than that of the turn-off losses due to the presence of parasitic capacitors. However, these similarities do not lead to similar thermal responses in both devices and the SOI is heated up at a much faster rate. By contrast, the SiC substrate in the Si/SiC behaves like an embedded heat sink regulating device temperature close to that of the ambient environment (423 K). In the high current condition, the peak temperature in the Si/SiC is 425 K, lower than 463 K in the SOI, thereby increasing reliability. The comparative studies are carried out on the 190 V LDMOSFETs in SOI, Si/SiC, Partial SOI (PSOI) and PSOSIC technology, based upon a capacitive and an inductive switching circuit. It is revealed that in spite of having a chip area 75% larger than the SOI structure, the Si/SiC solution undergoes negligible heating in any of the switching conditions simulated, exhibiting a very high energy capability. By contrast, the 22% area increase in the PSOSiC does not considerably change the way the energy is handled. This indicates that the Si/SiC is much more effective than PSOI and PSOSIC in dealing with the transient heating.
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Books on the topic "Simulation accuracy in power engineering"

1

Ordys, Andrzej W. Modelling and Simulation of Power Generation Plants. London: Springer London, 1994.

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Göttlich, Simone, Michael Herty, and Anja Milde, eds. Mathematical Modeling, Simulation and Optimization for Power Engineering and Management. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-62732-4.

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Hybrid electric power train engineering and technology: Modeling, control, and simulation. Hershey, PA: Engineering Science Reference, 2013.

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Rekioua, Djamila. Optimization of Photovoltaic Power Systems: Modelization, Simulation and Control. London: Springer London, 2012.

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O'Kelly, Peter. Computer Simulation of Thermal Plant Operations. New York, NY: Springer New York, 2013.

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Switchmode power supply simulation with PSpice and SPICE 3. New York: McGraw-Hill, 2005.

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Computer-aided power system analysis. New York: Marcel Dekker, 2002.

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Mohan, Ned. Power electronics: Converters, applicationsand design. 2nd ed. New York: John Wiley, 1995.

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Mohan, Ned. Power electronics: Converters, applications, and design. New York: Wiley, 1989.

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Mohan, Ned. Power electronics: Converters, applications, and design. 3rd ed. Hoboken, NJ: John Wiley & Sons, 2003.

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Book chapters on the topic "Simulation accuracy in power engineering"

1

Liu, Xiang-yu, Hui-bin Li, Xiao-ming Li, Shuai Li, Ning Gong, and Shi-bo Yang. "The Influence of Load Model on the Accuracy of Power Grid Simulation." In Lecture Notes in Electrical Engineering, 1063–75. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1528-4_109.

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Walter, Heimo, and Bernd Epple. "Checking Results, Accuracy, and Assessment." In Numerical Simulation of Power Plants and Firing Systems, 749–53. Vienna: Springer Vienna, 2017. http://dx.doi.org/10.1007/978-3-7091-4855-6_9.

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Pace, Dale K. "Fidelity, Resolution, Accuracy, and Uncertainty." In Modeling and Simulation in the Systems Engineering Life Cycle, 29–37. London: Springer London, 2015. http://dx.doi.org/10.1007/978-1-4471-5634-5_3.

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Naumann, Andreas, Florian Stenger, Axel Voigt, and Jörg Wensch. "High-Accuracy Thermo-Elastic Simulation on Massively Parallel Computer." In Lecture Notes in Production Engineering, 95–110. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12625-8_9.

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Dufour, Christian, and Jean Bélanger. "Real-Time Simulation Technologies in Engineering." In Transient Analysis of Power Systems, 72–99. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118694190.ch4.

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Stojkovic, Zlatan. "Computer-Aided Modeling and Simulation." In Computer- Aided Design in Power Engineering, 19–134. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30206-0_1.

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Hama, Takayuki, Masato Takamura, Cristian Teodosiu, Akitake Makinouchi, and Hirohiko Takuda. "Effect of Tool Modeling Accuracy on Sheet Metal Forming Simulation." In Engineering Plasticity and Its Applications, 743–48. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-433-2.743.

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Guo, Tingting, Shaohua Li, and Jianhong Liu. "Large Eddy Simulation of Film Cooling." In Challenges of Power Engineering and Environment, 1419–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_267.

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Protalinsky, Oleg, Anna Khanova, and Ivan Shcherbatov. "Simulation of Power Assets Management Process." In Recent Research in Control Engineering and Decision Making, 488–501. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12072-6_40.

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Yamada, Tomonori, and Shinobu Yoshimura. "Seismic Response Simulation of Nuclear Power Plant." In Springer Tracts in Mechanical Engineering, 141–55. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21048-3_5.

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Conference papers on the topic "Simulation accuracy in power engineering"

1

Wang, Xiangxu, Chunlin Guo, Xiangning Xiao, and Chengyong Zhao. "Establish of Accuracy Assessment Indexes of Power System Real-Time Digital Simulation." In 2011 Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2011. http://dx.doi.org/10.1109/appeec.2011.5747744.

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Lu, Bing, Xu Wang, Xing Chen, and Can Ding. "Experiment and Simulation of the Accuracy of Current Transformer with a New Core Material." In 2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2019. http://dx.doi.org/10.1109/appeec45492.2019.8994716.

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Xue, Ruo-Jun, and Ji-Lin Sun. "Modeling and Simulation of Deaerator in Nuclear Power Plant." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30452.

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Different deaerators have different structures, and the intensities of deaerating are different. But the deaerator models without considering the structure couldn’t show these aspects. In order to ensure the accuracy of simulation results, concrete structure of the deaerator should be taken into consideration. This paper carried out a mathematical model of horizontal type deaerator with constant nozzles and trays in nuclear power plants. It was built based on the structure of the segmentation deaerators and the process of heat transferring. This paper calculated the vapors condensation rate, it was based on heat transfer coefficient of direct contact condensation, and the heat transfer area of water film when working conditions were corresponding to the empirical formulas. While the working conditions were beyond the limits of empirical formulas, this paper would build models by conservation of energy, so the model could work under any working conditions. These models were installed in the simulation system of Qinshan Phase II., and were tested under variable power and accidental conditions. The testing results show that the models could fit for different steady working conditions. Compared with the outputs and the actual operating data, the error was small. Under the conditions of variable power and turbine tripping, changing of the parameters have the same trend curve with the actual operating data. Because of taking the concrete structure into consideration, these models can be performed better of the specific characteristics of the horizontal type deaerators with constant nozzles and trays in nuclear power plants, therefore the results are more accurate than the models without considering the structure.
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Barbierato, Luca, Enrico Pons, Andrea Mazza, Ettore Francesco Bompard, Vetrivel Subramaniam Rajkumar, Peter Palensky, Enrico Macii, Lorenzo Bottaccioli, and Edoardo Patti. "Stability and Accuracy Analysis of a Real-time Co-simulation Infrastructure." In 2021 IEEE International Conference on Environment and Electrical Engineering and 2021 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe). IEEE, 2021. http://dx.doi.org/10.1109/eeeic/icpseurope51590.2021.9584687.

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Xiao, LIU, ZHANG Yingxiao, LIN Shixuan, CHEN Peilin, YANG Lei, and TAN Fali. "Simulation study on attenuation characteristics of traveling wave and influencing factors of positioning accuracy of 10kV cable fault." In 2020 5th Asia Conference on Power and Electrical Engineering (ACPEE). IEEE, 2020. http://dx.doi.org/10.1109/acpee48638.2020.9136518.

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He, W., and Q. Chen. "Numerical Simulation of Molten Carbonate Fuel-Cell Power-Generation Systems." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0995.

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Abstract This paper provides a dynamic simulation model for investigation of the characteristics of molten carbonate fuel cell (MCFC) systems. To achieve the accuracy of the system model, the essential component model (i.g. fuel cell stack) is first established in three-dimensional, dynamic form, and it is then simplified prior to incorporation into the system model. The development of simulation techniques, such as estimation of variable limits, connection between component models, definition of input variable variation, and selection of simulation time step, has resulted in successful simulations. The stationary simulation results for the entire load range show that the fuel cell system has the highest efficiency at partial load (45% full load). The dynamic simulation results indicate the existence of dynamic interactions between the stack and reformer under load-up operation. Moreover, the investigation has evaluated the alternative operation strategy of providing fuel gas directly to the reformer combustor during load-up mode. This alternative strategy has significantly reduced the dynamic interactions. The model has also been used to select the location of the fuel flow control valve. These results can be used to improve MCFC system operation and control design.
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Hui, Kar Hoou, Meng Hee Lim, and Salman Leong. "Dempster-Shafer-Based Sensor Fusion Approach for Machinery Fault Diagnosis." In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3715.

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Artificial intelligence (AI) has played an increasingly important role in condition monitoring and machinery fault diagnosis in power generation plants. However, the accuracy and reliability of any AI-based machinery fault diagnosis is highly dependent on the quality and quantity of the input data fed to the AI model. The hypothesis of this paper is that AI-based fault diagnosis can be further improved by taking into account all the available sensor inputs of the machine. In short, the more sensor inputs fed into the AI model, the more accurate and reliable the outcome of the fault diagnosis. This paper proposes an application of Dempster-Shafer (DS) evidence theory for sensor fusion to improve the accuracy of decision-making in machinery fault diagnosis, by fusing all the available vibration signals measured on different axes and locations of the test machine. Vibration signals from different axes and locations of a machinery faults simulator were collected by multiple accelerometers simulating various machinery health conditions, namely healthy, unbalance, misalignment and foundation looseness. The accuracy of fault diagnosis using a different number of sensor inputs was then investigated. Analysis results showed that by combining more sensor inputs using a DS-based algorithm can improve fault detection accuracy from an average of 63% to 83%. In conclusion, the multi-sensor fusion algorithm can be applied to increase the accuracy and reliability of AI-based fault diagnosis.
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Bottenberg, Agknaton, Jos Knockaert, and Jan Desmet. "Comparing accuracy and runtime of simulation to the measurements in a real grid for the control of a grid-connected PV inverter." In 2017 52nd International Universities Power Engineering Conference (UPEC). IEEE, 2017. http://dx.doi.org/10.1109/upec.2017.8231950.

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Miller, John L., and Caroline Hayes. "Leaf Pruning and Node Consolidation: Two Methods of Reducing Distribution Network Model Size Without Sacrificing Simulation Accuracy." In ASME 1993 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/cie1993-0080.

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Abstract Large distribution networks often need to be modified to meet new demands. Designers use CAD and load-flow simulators to determine the characteristics of gas, liquid, and electric power distribution networks. Running the simulations required to engineer changes to a network is a lengthy process. The number of alternatives which can be explored depends upon the number of simulations which can be fit into the time allotted for design. Removing unimportant detail from a complete network representation results in a shorter per-simulation run time. Leaf pruning and node consolidation are two methods used to remove such details. These methods rely on the characteristics of the graph representation of the network, and so should apply to all steady-state load-flow simulations. Using leaf pruning and node consolidation together, per-simulation time can be cut tenfold, usually without significantly affecting total simulation accuracy. A reduction in per-simulation time translates into a less costly network analysis of the same quality as previously possible, or a more thorough analysis of network characteristics in the time period set aside for design. Steam distribution networks are used to illustrate the methods discussed.
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Akkaram, Srikanth, Don Beeson, Harish Agarwal, and Gene Wiggs. "Inverse Modeling Techniques for Parameter Estimation in Engineering Simulation Models." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90058.

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Computational simulation models are extensively used in the development, design and analysis of an aircraft engine and its components to represent the physics of an underlying phenomenon. The use of such a model-based simulation in engineering often necessitates the need to estimate model parameters based on physical experiments or field data. This class of problems, referred to as inverse problems [1] in the literature can be classified as well-posed or ill-posed dependent on the quality (uncertainty) and quantity (amount) of data that is available to the engineer. The development of a generic inverse modeling solver in a probabilistic design system [2] requires the ability to handle diverse characteristics in various models. These characteristics include (a) varying fidelity in model accuracy with simulation times from a couple of seconds to many hours (b) models being black-box with the engineer having access to only the input and output (c) non-linearity in the model (d) time-dependent model input and output. The paper demonstrates methods that have been implemented to handle these features with emphasis on applications in heat transfer and applied mechanics. A practical issue faced in the application of inverse modeling for parameter estimation is ill-posedness that is characterized by instability and non-uniqueness in the solution. Generic methods to deal with ill-posedness include (a) model development, (b) optimal experimental design and (c) regularization methods. The purpose of this paper is to communicate the development and implementation of an inverse method that provides a solution for both well-posed as well as ill-posed problems using regularization based on the prior values of the parameters. In the case of an ill-posed problem, the method provides two solution schemes — a most probable solution closest to the prior, based on the singular value decomposition (SVD) and a maximum a-posteriori probability solution (MAP). The inverse problem is solved as a finite dimensional non-linear optimization problem using the SVD and/or MAP techniques tailored to the specifics of the application. The paper concludes with numerical examples and applications demonstrating the scope as well as validating the developed method. Engineering applications include heat transfer coefficient estimation for disk quenching in process modeling, material model parameter estimation, sparse clearance data modeling, steady state and transient engine high-pressure compressor heat transfer estimation.
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