面向CGF对象的仿真建模方法

对于复杂大系统的分析和评估，仿真是一个最重要的手段。但复杂大系统中的元素多、相关性多、建模描述较难。面向复杂分布仿真的技术体系中，HLA是一个重要的标准，针对HLA的建模对于面向HLA的分布式仿真是仿真的关键点。该文提出了一个面向HLA分布式仿真的CGF对象(计算机产生兵力)建模方法。     

基于分布式异构仿真的协同建模框架研究

复杂大系统的建模与仿真涉及到多个领域的人员协同开发,各类人员采用本领域成熟的建模方法和工具构建模型,这些模型具备粒度精细、置信度较高的特点,但同时也产生了模型异构的问题.本文针对复杂系统的大规模仿真应用探讨了异构模型开发和集成的思路,对如何使这些异构模型协同参与仿真的问题进行了深入研究,分析和归纳了当前已有的协同建模仿真环境DEVS/HLA、DEVS总线以及CDM的工作原理和关键技术,提出了以分布式异构模型为基础的协同建模框架的功能描述.     

基于异构Flink集群的节点优先级调度策略

Flink流处理系统默认的任务调度策略在一定程度上忽略了集群异构和节点可用资源,导致集群整体负载不均衡。研究分布式节点的实时性能和集群作业环境,根据实际作业环境的异构分布情况,设计结合异构Flink集群的节点优先级调整方法,以基于Ganglia可扩展分布式集群资源监控系统的集群信息为依据,动态调整适应当前作业环境的节点优先级指数。基于此提出Flink节点动态自适应调度策略,通过实时监测节点的异构状况,并在任务执行过程中根据实时作业环境更新节点优先级指数,为系统任务找到最佳的执行节点完成任务分配。实验结果表明,相比于Flink默认的任务调度策略,基于节点优先级调整方法的自适应调度策略在WorldCount基准测试中的运行时间约平均减少6%,可使异构Flink集群在保持集群低延迟的同时,节点资源利用率和任务执行效率更高。     

协同目标判断仿真实验系统设计与实现*

采用基于消息的分布式系统设计方法开发了协同目标判断仿真实验系统。该系统是由实验管理节点和多个雷达终端仿真节点组成的分布式仿真系统,各节点通过消息通信机制相连接。系统具备实验运行控制、实验数据管理和雷达终端仿真等功能。经过实际运行测试,该系统能够有效地支持组织决策问题的实验研究。     

基于DDS的飞机机电系统组态监控技术研究

为了解决基于DDS的分布式协同仿真平台多节点、多模型条件下飞机机电系统复杂关联参数的实时监控问题,结合组态监控技术提出一种基于DDS的飞机机电系统协同仿真组态监控方法,设计了组态监控平台与分布式仿真平台的数据交互接口,实现飞机机电系统模型的实时过程监控以及监控界面的图形化显示;集成测试结果表明,该组态监控方法实现了对飞机机电系统复杂关联参数的读写、存储以及监控界面的图形化显示,提高了飞机机电系统的协同仿真验证效率,降低了分布式协同仿真监控系统的开发难度.     

异构型分布式计算机系统技术

异构型分布式计算机系统(HCS)由互连的不同硬件或软件系统组成,一个典型的HCS 可配置以不同操作系统,用不同网络连接,具有不同类型的机器。随着计算机技术的发展以及分布、互连和协同操作计算机系统的     

UUV群探测系统仿真设计

研究水下航行器(UUV)群协同探测问题,系统用多传感器协同探测,执行警戒、侦察、监视水下航行等作战任务,要求实时快速和准确探测。针对目前水下情况复杂,UUV导航精度低、水声通信误码率大等状态。为解决算法研制与实际结合不紧密的问题,提高UUV群协同探测系统性能,采用GUI函数接口,设计并实现了UUV群协同探测仿真系统。系统可通过可视化界面,用MATLAB平台对UUV群用于多目标的协同探测算法进行仿真。仿真结果表明,仿真系统能够满足UUV协同仿真测试要求,对于UUV群协同探测系统的研制具有重要的应用价值。     

分布式多主体仿真的开发环境研究

基于主体的计算机仿真技术,又称为“ABS”(AgentBasedSimulation),由于在建模方法上强调刻画各种系统主体的微观结构和行为机制,引入学习机制使主体适应环境变化,并以消息建立主体间的联系,使形成的模型在宏观层面上具备了分化、突现等复杂系统特征,在各种复杂系统的研究中得到了广泛应用,日益成为社会科学、经济学、生物学等学科中的重要研究手段。该文讨论基于主体仿真系统的分布式技术,并介绍一个开发平台DABS,该环境可用于开发分布式的经济仿真系统。     

基于网格仿真的研究与认识

基于网格技术进行分布式仿真的研究,目前已经成为了仿真技术研究的一个新的热点.该文从对网格的认识入手,分析了什么是网格,什么是网格技术,在阐述网格研究现状的基础上,分析了目前网格研究中的两个认识误区.根据仿真技术发展的需求,分析了基于网格进行分布式仿真的重要性,并阐述了目前基于网格仿真的研究现状.根据网格技术与分布式仿真技术的特点,提出了进行基于网格仿真的几个重点研究方向,包括仿真资源协同组织调度的研究,仿真客户端资源使用模式的研究,和客户端与仿真节点以及仿真节点间连通方式的研究等.     

Adams与Simulink的分布式协同仿真

研究Adams虚拟样机模型与Simulink控制器的分布式协同仿真方法,提出应用高层体系结构技术构建一个跨学科的分布式仿真环境,对2个不同学科的仿真模型进行联邦成员化封装,在RTI软件支撑下进行多节点的分布式协同仿真。通过实例验证该仿真方法的有效性。     

实时协同位图编辑系统中不一致性问题研究

实时协同编辑系统有着广泛的应用前景,然而其冲突性操作导致众多结果不一致,解决一致性问题已成为设计与实现实时协同系统的关键性问题。该文基于对分布式系统采用的各种并发控制和一致性维持模型的比较,分析协同编辑中的三种不一致性问题、一致性模型,并研究相应的解决技术,提出了一种新的基于复制结构的协同位图编辑系统一致性维持模型。     

基于共生仿真的巡航导弹协同作战研究

为了应对体系对抗过程中复杂多变的战场环境,巡航导弹需通过动态协同执行作战任务。目前,国内外在巡航导弹协同作战的研究过程中,提出了几种动态协同模式,但都在一定程度上存在局限性。基于此,首先提出有限中央控制的分布式自主协同,对其系统业务逻辑进行了详细的设计和系统功能进行了详细的分析,并以此为背景开展基于共生仿真的远程控制协同系统体系结构设计。     

A solution of multidisciplinary collaborative simulation for complex engineering systems in a distributed heterogeneous environment

This paper presents an integrated approach to multidisciplinary collaborative simulation for complex engineering systems. The formulized paradigm of multidisciplinary collaborative simulation for com- plex engineering systems is principally analyzed. An IEEE HLA and web services based framework is proposed to provide a heterogeneous, distributed and collaborative running environment where multidisciplinary modeling, running management and post-processing of collaborative simulation are undertaken. The mecha...     

Symbolic approximate time-optimal control

There is an increasing demand for controller design techniques capable of addressing the complex requirements of today’s embedded applications. This demand has sparked the interest in symbolic control where lower complexity models of control systems are used to cater for complex specifications given by temporal logics, regular languages, or automata. These specification mechanisms can be regarded as qualitative since they divide the trajectories of the plant into bad trajectories (those that need to be avoided) and good trajectories. However, many applications require also the optimization of quantitative measures of the trajectories retained by the controller, as specified by a cost or utility function. As a first step towards the synthesis of controllers reconciling both qualitative and quantitative specifications, we investigate in this paper the use of symbolic models for time-optimal controller synthesis. We consider systems related by approximate (alternating) simulation relations and show how such relations enable the transfer of time-optimality information between the systems. We then use this insight to synthesize approximately time-optimal controllers for a control system by working with a lower complexity symbolic model. The resulting approximately time-optimal controllers are equipped with upper and lower bounds for the time to reach a target, describing the quality of the controller. The results described in this paper were implemented in the Matlab Toolbox Pessoa (Mazo et al., 2009 [12]) which we used to workout several illustrative examples reported in this paper.     

Using collaborative computing technologies to enable the sharing and integration of simulation services for product design

Nowadays simulation is commonly used in engineering design for verifying design concepts before physical prototypes are produced. The simulation of complex products such as mechatronics in general involves a synergy of multiple traditional disciplinary areas and entails the collaborative work of a multidisciplinary team. A need thus arises for supporting the effective and efficient integration of subsystem models at simulation runtime and in a distributed environment. These models are generally created using different simulation tools and depend on the inputs from each other to perform numerical integration. As such, many issues need to be addressed, e.g. system modeling, the use of computing technologies, and the runtime interaction between models. In this paper, a service-oriented paradigm is presented which is underpinned by collaborative computing technologies to enable the provision of simulation models as services as well as the integration of these services for performing simulation tasks in product design. As well as the implementation of such a paradigm, a method for the interaction between models is in particular developed to achieve high accuracy for the simulation of design problems involving the solving of system equations. Preliminary evaluation work shows that the proposed paradigm underpinned by collaborative computing technologies is viable and have great potential in supporting collaborative simulation development in industry and the method for interaction control successfully achieves better accuracy compared with traditional methods.     

基于近似模拟的多智能体系统分布式层次控制设计

本文主要探讨基于近似模拟的多智能体系统分布式层次控制的设计问题。为降低问题复杂度,首先建立了一个简单的抽象系统指导各智能体,继而讨论这一抽象系统和多智能体之间的模拟关系。借助于该抽象系统,给出多智能体系统完成一类协调任务的分布式层次控制器。同时利用模拟函数和共同Lyapunov函数,进一步分析了多个体系统在切换拓扑下的集体行为。     

Process Simulation Using Randomized Markov Chain and Truncated Marginal Distribution

Generating pseudo random objects is one of the key issues in computer simulation of complex systems. Most earlier simulation systems include procedures for the generation of independent and identically distributed random variables or some classical random processes, such as white noise. In this paper we propose a new approach to the generation of wide ranges of processes that are characterized by marginal distribution and autocorrelation function that are significant in many cases. The proposed algorithm is based on the use of truncated distribution that gives more simplicity and efficiency in comparison with the previous one. The effectiveness of the proposed algorithm is verified using computer simulation of various real examples.     

A communication technology for internet-based collaboration optimization for distributed structural systems

Along with development of incorporation of world economy, collaborative design and collaborative manufacture of enterprises often occur. Subsystems of a complex product system are often analyzed and optimized individually by different design units distributed at different places. In order to find the optimum designs of overall product systems automatically, the internet-based global coordinating optimization is necessary. In this paper, an email-based communication technology of global coordinative optimization of distributed structural systems is proposed, and its realizing approach, communication, process control, practical software and application example are presented.     

基于因果逻辑关系的CPS分布式控因研究

针对多子系统间存在复杂因果逻辑关系的信息物理系统(cyber-physical systems,CPS),建立带有未知非线性项和不确定耦合项的CPS多因系统模型,并提出基于云控制技术的分布式控因方法.利用非线性解耦观测器对CPS多因系统进行动态前馈线性化,使得CPS多因系统分解为多个无耦合关联的CPS因系统.设计基于非线性解耦观测器的分布式模型预测控制器以及分布式优化算法,对解耦后的CPS因系统实现在线约束优化控制.最后,通过数值仿真表明所提出控制策略和优化算法的有效性.     

Rapid prototyping of real-time control laws for complex mechatronic systems: a case study

Rapid prototyping of complex systems embedded in even more complex environments raises the need for a layered design approach. Our example is a mechatronic design taken from the automotive industry and illustrates the rapid-prototyping procedure of real-time-critical control laws. The approach is based on an object-oriented structuring allowing not only central control units but also distributed control units as needed by today’s designs. The implementation of control laws is a hardware-in-the-loop simulation, refined in steps and reducing the simulation part at every one of these. On the lower level, common platforms, such as FPGAs, microcontrollers or specialized platforms, can be instantiated.