共查询到20条相似文献,搜索用时 125 毫秒
1.
随着计算机技术的发展, 基于Agent的建模与仿真技术被认为是研究复杂系统的有效方法, Repast Simphony平台为基于Agent的建模与仿真提供了有利条件. 针对如何利用Repast Simphony平台构建复杂系统仿真模型的问题, 重点介绍了Repast Simphony仿真平台, 分析了它的技术优势, 与同类仿真平台进行了比较分析, 并在分析平台主要类库的基础上, 总结出建模仿真的一般流程. 最后, 通过一个改进的Schelling模型仿真实例进一步阐述了利用平台构建复杂系统的设计与实现方法, 对使用Repast Simphony平台进行基于Agent的建模与仿真研究具有一定的指导意义. 相似文献
2.
3.
4.
针对复杂系统仿真中系统信息缺乏、QSIM建模方法可使用微分方程的特点,在复杂系统仿真方法中,提出了一种GM(1,N)和QSIM相结合的定性建模方法.首先给出了相关研究的现状,然后提出了GM(1,N)和QSIM相结合的仿真建模方法的基本原理和主要过程.最后通过一个系统仿真建模实例验证了该方法的可行性.结果表明,该方法具有充分利用系统较少信息,能将定量和定性信息有效地融合与复杂系统的仿真建模之中的特点. 相似文献
5.
6.
为了可视化仿真惯性平台初始对准过程和运动规律,利用实时建模工具MultiGen Creator(Creator)建立了惯性平台的模型,并采用渲染引擎OpenSceneGraph(OSG)进行驱动渲染,实现了一个惯性平台运动仿真系统。根据惯性平台运动方程输入激励,运行结果表明,所建立的仿真系统能够完整演示惯性平台初始对准过程和运动规律,三维显示效果逼真度高,且能实时响应用户操作。 相似文献
7.
从建模与仿真实施质量的定义及相关概念、仿真工作整体、仿真数据、建模过程、模型、结果等方面综述了近几十年的相关文献, 总结了现有研究成果. 目前建模与仿真实施质量的研究大部分集中在数据、仿真工作整体上, 从全生命周期的系统研究相对较少, 并且缺少规范化的框架确保建模与仿真实施的最终效果. 从全生命周期的角度研究实施质量是比较全面完整的, 所以其研究是很有必要的. 最后从生命周期角度展望了建模与仿真实施质量的研究方向. 相似文献
8.
虚拟海战场中场景生成与实时显示技术研究 总被引:3,自引:0,他引:3
虚拟海战场的三维场景生成与实时显示是构成虚拟海战场视景仿真系统的重要部分,包括几何形体建模、纹理映射以及视觉效果处理等内容。以MultiGen Creator为建模平台,通过完成一个仿真模型讨论了解决建模逼真度与仿真实时性矛盾的一些措施;基于Vega仿真软件环境开发了海洋战场中的各种复杂场景特效,解决了非视觉物理量的可视化问题;利用Visual C++开发了视景仿真程序。解决了视景驱动,自动视点切换及仿真记录回放等具体问题。仿真结果表明,该系统较好地满足了视景仿真实时性和逼真度的要求。 相似文献
9.
10.
军用飞机保障能力评价建模与仿真 总被引:1,自引:0,他引:1
在对军用飞机维修保障过程分析的基础上,运用离散事件建模方法和计算机建模与仿真技术建立了飞机维修保障仿真模型。仿真出飞机使用可用度(A0)、出动架次率(SGR)、备件延误时间(SDT)、系统无故障工作时间(MTBF)等指标,来评价保障能力。仿真模型可以量化分析影响军用飞机保障能力的各种因素,显示、预测保障系统运行状态,提供辅助决策。通过改变任务计划、备件策略、维修策略。做动态敏感性分析。可以评价不同方案的维修保障能力,改进现有维修保障系统。仿真模型目前应用于航空兵部队团级保障能力评价,今后还将对未定型飞机开展维修保障仿真验证。 相似文献
11.
概念模型的描述方法和验证过程 总被引:2,自引:0,他引:2
概念模型(Conceptual model)是对问题域抽象的产品,它对于仿真开发和仿真可信度影响重大。该文介绍了两种概念模型的描述形式。一种是科学报告方法,它采用科学报告的严谨格式,从九个方面完备、清晰地描述了概念模型;另一种是设计融合方法,它采用Rational/UML结构、图表描述概念模型,它可以指导仿真设计和实现。科学报告方法是基于文本形式的,设计融合方法是基于UML图表的,建议两种方法结合起来描述概念模型。仿真的可信度由概念验证决定,文中给出了概念验证的六个步骤。 相似文献
12.
13.
Surrogate‐assisted EM‐driven miniaturization of wideband microwave couplers by means of co‐simulation low‐fidelity models 下载免费PDF全文
This article proposes a methodology for rapid design optimization of miniaturized wideband couplers. More specifically, a class of circuits is considered, in which conventional transmission lines are replaced by their abbreviated counterparts referred to as slow‐wave compact cells. Our focus is on explicit reduction of the structure size as well as on reducing the CPU cost of the design process. For the sake of computational feasibility, a surrogate‐based optimization paradigm involving a co‐simulation low‐fidelity model is used. The latter is a fundamental component of the proposed technique. The low‐fidelity model represents cascaded slow‐wave cells replacing the low‐impedance lines of the original coupler circuit. It is implemented in a circuit simulator (here, ADS) and consists of duplicated compact cell EM simulation data as well as circuit theory‐based feeding line models. Our primary optimization routine is a trust‐region‐embedded gradient search algorithm. To further reduce the design cost, the system response Jacobian is estimated at the level of the low‐fidelity model, which is sufficient due to good correlation between the low‐ and high‐fidelity models. The coupler is explicitly optimized for size reduction, whereas electrical performance parameters are controlled using a penalty function approach. The presented methodology is demonstrated through the design of a 1‐GHz wideband microstrip branch‐line coupler. Numerical results are supported by experimental validation of the fabricated coupler prototype. 相似文献
14.
A computationally efficient algorithm for electromagnetic (EM)‐simulation‐driven design optimization of microwave structures is proposed. Our technique exploits variable‐fidelity EM simulations and the multilevel design approach where an approximate optimum of the lower accuracy but faster EM model of the structure under design is used as a starting point for optimizing a more accurate model. Several enhancements of the basic multifidelity method are introduced, including an efficient algorithm of optimizing EM models that is based on local response surface approximations, as well as automated adjustment of model fidelity. Convergence of the procedure to the optimum design is ensured by defaulting to the higher fidelity model whenever the prediction given by the lower fidelity fails to improve the design. Distribution of the computational effort between the models of different fidelity allows for making larger steps in the design space at a low cost, as well as substantial reduction of the number of high‐fidelity model evaluations, because the high‐fidelity model is only referred to in the last design stage. The article provides comprehensive numerical verification of our technique. Substantial computational savings are demonstrated in comparison to the benchmark methods: over 40% on average as compared to a basic version of the multifidelity optimization approach and over 95% as compared to direct optimization of the high‐fidelity model. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:281–288, 2014. 相似文献
15.
16.
为降低复杂网络模拟的计算开销,保证网络流量中数据包模拟的真实性,提出了一种面向拓扑聚焦的网络流量模拟方法。根据网络流量中数据包的路由路径所在区域,将数据包分为三种类型,对于每种类型的数据包采用不同的模拟方法。基于网络拓扑的实验表明,该方法适用于复杂网络的模拟,保证数据包模拟的真实性。 相似文献
17.
18.
近年来飞机失控已成为飞行事故主要原因,飞行模拟器需要具备失控预防和改出训练功能,因此对洗出算法提出了更高的要求。利用模型预测控制理论对约束处理的优势,结合人体前庭感知模型,建立了基于模型预测控制的洗出算法,采用失速改出这一典型飞机失控情况进行仿真实验,并与经典洗出算法进行了比较,结果表明,模型预测控制洗出算法在约束范围内,提高了仿真逼真度,并具有较好的调整灵活性,对飞行模拟器失控改出训练具有一定应用价值。 相似文献
19.
Cutting on triangle mesh: local model-based haptic display for dental preparation surgery simulation 总被引:4,自引:0,他引:4
Wang D Zhang Y Wang Y Lee YS Lu P Wang Y 《IEEE transactions on visualization and computer graphics》2005,11(6):671-683
A new method to realize stable and realistic cutting simulation using an impedance display haptic device and microcomputer is presented in this paper. Material removal or cutting simulation is a critical task in dental preparation surgery simulation. In this paper, a piecewise contact force model is proposed to approximately describe the cutting process. Challenging issues of minimizing the difference between the cutting simulation and haptic contact simulation are analyzed. The proposed contact-based simulation method is developed for a one-dimensional cutting task and can be expanded to three-dimensional cases. Local model-based multirate simulation cutting architecture is proposed and force control of the haptic device is decoupled from the cutting simulation loop, which can both ensure high fidelity of dynamical simulation as well as maintain stability of the haptic device. The cutting operation is realized using spherical and cylindrical shaped tools. An experiment based on the Phantom desktop proves that fidelity in one-dimensional cutting can be realized and stability in three-dimensional cutting can be ensured using the force-filtering method. 相似文献
20.
文章就燃煤发电机组的仓储式钢球磨制粉系统建立了数学模型,并用简便的工程模块化的建模方法建立了某电厂这一系统的仿真模型。模型能较逼真的仿真系统的静态、动态和故障状态特性,且有较强的通用性。 相似文献