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检索条件"任意字段=4th Grand Challenges in Modeling and Simulation Conference, GCMS 2011"

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Coherent design methodology using modelling, simulation and optimisation

Coherent design methodology using modelling, simulation and ...

引用

4th grand challenges in modeling and simulation conference, gcms 2011

作者： Palmer, Patrick R. Molina-Cristóbal, Arturo Parks, Geoffrey T. Department of Engineering University of Cambridge Cambridge United Kingdom

ISBN: (纸本)9781617829512

there is an increasing demand for optimising complete systems and the devices within that system, including capturing the interactions between the various multi-disciplinary (MD) components involved. Furthermore confidence in robust solutions is esential. As a consequence the computational cost rapidly increases and in many cases becomes infeasible to perform such conceptual designs. A coherent design methodology is proposed, where the aim is to improve the design process by effectively exploiting the potential of computational synthesis, search and optimisation and conventional simulation, with a reduction of the computational cost. this optimization framework consists of a hybrid optimization algorithm to handles multi-fidelity simulations. Simultaneously and in order to handles uncertainty without recasting the model and at affordable computational cost, a stochastic modelling method known as non-intrusive polynomial chaos is introduced. the effectiveness of the design methodology is demonstrated with the optimisation of a submarine propulsion system.

关键词： Stochastic systems

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New Basic Linear Algebra methods for simulation on GPUs

New Basic Linear Algebra methods for simulation on GPUs

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4th grand challenges in modeling and simulation conference, gcms 2011

作者： Shi, Jian Zhang, Yiwei Langland, Blake Tang, Jijun Dougal, Roger Dept. of Computer Science and Engineering University of South Carolina Columbia SC United States Dept. of Electrical Engineering University of South Carolina Columbia SC United States

ISBN: (纸本)9781617829512

We have used Graphics Processing Units (GPUs) to accelerate the solution of the types of equations typically encountered in dynamic system simulators. Compared to commercial matrix solvers that run on a CPU, we realized speedups ranging from 5 (for system size ≈ 700) to 460 (for system size ≈ 5800). While calculation time for the commercial matrix solver increased with matrix size ≈ O(N)2.3, our new GPU-based Preconditioned Generalized Minimal Residual (PGM-RES) technique yielded scaling as ≈ O(N)1.2. A significant component of this performance was achieved by development of new Basic Linear Algebra routines for the NVIDIA Tesla GPU that directly address characteristics typical of matrices that describe the time domain response of naturally-coupled dynamic systems.

关键词： Graphics processing unit

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Research on independent and dynamic fault-tolerant and migration technology for cloud simulation resources

Research on independent and dynamic fault-tolerant and migra...

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4th grand challenges in modeling and simulation conference, gcms 2011

作者： Hou, Baocun Chai, Xudong Li, Bohu Li, Tan Zhang, Yabin Zhang, Zhihui Beijing Simulation Center Beijing 100854 China Beijing University of Aeronautics and Astronautics Beijing 100083 China

ISBN: (纸本)9781617829512

To solve the fault-tolerant and migration problems of simulation grid applications, the art of related research works is introduced firstly. then, by adopting reflective software analysis and modeling method, the independent and dynamic fault-tolerant and migration model for simulation resources is proposed. Further more, the research fruits on several related key technologies are presented in detail, which include: to inspect the resources, the loading model is defined and the independent error forecast is achieved;the consistency of the simulation time is ensured by the harmonious advance of the state management of federates and the distributed simulation time management;and the automatic storage and restoring of state is accomplished. the research fruits above have been applied to the development of fault-tolerant and migration service for COSIM-CSP1.0v, and gained well validation in some typical applications. the multidisciplinary, distributed and collaborative simulation application for undercarriage virtual prototype is introduced as an example. Finally the conclusion is given.

关键词： Fruits

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modeling a new naval connectors logistical contribution with a system-of-systems discrete event simulation

Modeling a new naval connectors logistical contribution with...

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4th grand challenges in modeling and simulation conference, gcms 2011

作者： Beisecker, Elise Pritchard, Peter Balestrini, Santiago Mavris, Dimitri Aerospace Systems Design Laboratory Georgia Institute of Technology United States

ISBN: (纸本)9781617829512

Introducing a new connector, such as the Transformable Craft (T-Craft), will impact the Navy logistical performance at an operational level. To investigate this impact, it is necessary to develop a system-of-systems level model that can capture the scenario of interest and the capabilities of vessels that would operate in the future Navy fleet. thus the model must capture scenario, architectural, and vessel performance and interaction information. the goal of the model is to capture enough interactions, details of vessel performance, and types of vessels while maintaining a flexible model architecture and rapid evaluation. A Discrete Event simulation (DES) construct was selected using matrix mathematics to model interactions. the focus of this work is on creating the math-based, flexible architecture. the processes defined for existing and potential future vessels and other vehicles, including sea connectors, cargo vessels, and air connectors, with the potential for including additional vessels are discussed. Sample results and analysis options demonstrate the visualization and decision support potential using this model.

关键词： Discrete event simulation

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Advantages and challenges of non-intrusive polynomial chaos theory

Advantages and challenges of non-intrusive polynomial chaos ...

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4th grand challenges in modeling and simulation conference, gcms 2011

作者： Togawa, Kanali Benigni, Andrea Monti, Antonello Institute for Automation of Complex Power Systems E.ON Energy Research Center RWTH Aachen University 52074 Germany

ISBN: (纸本)9781617829512

We introduce a fast method for the stochastic analysis of systems with continuous stochastic parameters. this involves non-intrusive Polynomial Chaos, a concept related to generalized Polynomial Chaos. A single polynomial basis corresponding to a probability distribution is used, where the support of its probability density function allows the application of simple quadrature rules for the calculation of Polynomial Chaos expansion coefficients. through these steps, we obtain a method which allows the use of Polynomial Chaos with black boxes. In this way, Polynomial Chaos is made significantly more attractive, since the new method will neither require deep understanding of its mathematical foundation, nor the usual adjustments of the polynomial basis for every problem, but allows users to run fast simulations with a Polynomial Chaos approach, for the stochastic analysis of systems. As well as a mathematically detailed explanation and an application example with a single-phase rectifier, we will describe advantages and challenges of this method.

关键词： Stochastic systems

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Using co-simulation method to analyze the communication delay impact in agent-based wide area power system stabilizing control

Using co-simulation method to analyze the communication dela...

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4th grand challenges in modeling and simulation conference, gcms 2011

作者： Li, Weilin Li, Huimin Monti, Antonello E.ON Energy Research Center RWTH Aachen University Aachen Germany Dept. of Electrical Engineering University of South Carolina Columbia SC United States

ISBN: (纸本)9781617829512

the time delay existing in the data communication is a potential detriment to wide area power system control. this paper analyzes the impact of time delay to a multi-agent based power system stabilizing control with a co-simulation method. the co-simulation method uses two off-the-shelf softwares: MATLAB and OPNET to run the simulation concurrently. MATLAB is used to simulate the power systems and the controllers while OPNET is used to simulate the communication network with time delays. A two-area four-generator system is used as a case study. simulation results not only demonstrate the latency impact on the performance of stabilizing control, but also indicate to what extent the following factors, network data rate, packet size, and background utilization, contribute to time delay. can degrade the performance of controls in the power systems.

关键词： Time delay

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Accelerating the simulation of shipboard power systems

Accelerating the simulation of shipboard power systems

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4th grand challenges in modeling and simulation conference, gcms 2011

作者： Uriarte, F.M. Hebner, R.E. Gattozzi, A.L. Center for Electromechanics University of Texas Austin United States

ISBN: (纸本)9781617829512

this paper presents an approach to accelerate the simulation of shipboard power systems. A common issue in the ship research community is the simulation run time of large-scale shipboard power systems. A contributor to lengthy run times is that PC-based power system simulators do not exploit multicore technology, which stems from the fact that software trails advances in hardware. the Center for Electromechanics at the University of Texas at Austin (UT-CEM) is developing a multicore power system solver (CEMSolver) to simulate shipboard power system models in significantly less time. the simulation run time is reduced by first partitioning power system models and then creating simulations at the subsystem level. this accelerates the simulation of shipboard power systems. A general overview of CEMSolver and a comparison of its run times against those of SimPowerSystems are presented. the results demonstrate that CEMSolver can speed up the simulation of shipboard power system models built with SimPowerSystems up to 80 times, and that, despite common belief, multicore desktop computers are capable of executing complex simulation scenarios.

关键词： Ships

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simulation of a DC to DC power conversion module for the all-electric ship

Simulation of a DC to DC power conversion module for the all...

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4th grand challenges in modeling and simulation conference, gcms 2011

作者： Gray, Weston L. Kirtley Jr., J.L. Chalfant, J.S. Chryssostomidis, C. Cambridge MA United States Cambridge MA United States Cambridge MA United States

ISBN: (纸本)9781617829512

the design of electric ships requires a tool to evaluate the relative merits of different electrical power distribution configurations;the MIT end-to-end simulator [2] is just such a tool. this paper models one module to be used in conjunction with the end-to-end simulator: a power converter that converts MVDC bus voltage to 1kV DC. First, the power converter was designed to use commercially available technology. this design resulted in a low-frequency, 2 kHz, 200 kW power converter commonly called a double-ended, isolated forward converter [1] the initial converter design was then modeled in Simulink. the response characteristics of the converter were analyzed to ensure the response followed demonstrated behavior consistent with this type of converter. Finally, the model was tested against a nominal set of specifications [3] that determined adequate response characteristics.

关键词： Simulink

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Research on high-efficiency simulation technology for complex system

Research on high-efficiency simulation technology for comple...

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4th grand challenges in modeling and simulation conference, gcms 2011

作者： Li, Bohu Li, Tan Hou, Baocun Chai, Xudong Zhang, Yabin Zhang, Zhihui Yao, Yiping Zhang, Lin Beijing University of Aeronautics and Astronautics Beijing 100083 China Beijing Simulation Center Beijing 100854 China National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9781617829512

the definition, importance and research issues of High-efficiency simulation for Complex system are proposed firstly in the paper. the application demands for the development of high-efficiency simulation technology for complex system are discussed from two aspects, which are the demand from Complex system modeling and simulation for high-end users and that of Providing "cloud simulation services" for massive users. 8 important technologies in current high-efficiency simulation for complex system from three aspects, which are high-efficiency simulation modeling technology, high-efficiency simulation system and infrastructure technology and high-efficiency simulation application technology, are introduced in detail, including (1) High-efficiency simulation language for complex system, (2) High-efficiency simulation algorithm for complex system;(3) Hardware Optimization of high-efficiency simulation;(4) High-efficiency simulation software support technology;(5) High-efficiency cloud simulation technology;(6) VV&A technology on high-efficiency simulation system for complex system, (7) Massive data management technology, (8) simulation experiment results analysis and evaluation technology for complex system. Conclusion and recommendation are given at the end of the paper.

关键词： Efficiency

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Efficient real-time simulation of linear differential equations arising from simulation of electronic power systems

Efficient real-time simulation of linear differential equati...

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4th grand challenges in modeling and simulation conference, gcms 2011

作者： Zenor, John Bednar, Richard Crosbie, Roy Hingorani, Narain McLeod Institute of Simulation Sciences Department of Electrical and Computer Engineering California State University Chico United States

ISBN: (纸本)9781617829512

Recent research has focused on developing techniques to support efficient, low-cost, high-speed, real-time simulation of modern power electronic systems. the higher speed components of these systems require frame times of a few microseconds or less. Digital Signal Processors (DSPs) and Field-programmable gate arrays (FPGAs) have been investigated for applicability to meet the computational requirements for the high-speed components in power systems. though demonstrated to have the performance required, initially the implementation effort and development time required was excessive. First, techniques for solving the differential equations arising from the models of power system components were investigated that met the requirements of a high-speed real-time simulation: simplicity, predictability of computation time, stability, and accuracy. Methods and tools for quickly and automatically implementing the high-speed solutions to these equations in FPGAs were then developed. the FPGA based simulations were integrated into the Virtual Test Bench (VTB) for graphical presentation of the results, and to take advantage of the VTB model libraries and capabilities for rapid development of simulations for the lower-speed components of the power systems.

关键词： Digital signal processors

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