制冷系统动态仿真若干问题分析

针对制冷系统动态仿真中若干基本问题，即制冷装置基本分析，换热器基本模型及动态仿真计算方法进行了讨论分析，为制冷系统在计算机上进行仿真及优化设计奠定基础。     

PWM变频调速系统的谐波分析和仿真研究

对产生PWM波的几种方式的谐波特性做了比较和探讨,为合理地选取控制方式提供了依据.通过对比的方式对WPM逆变器控制的感应电机的稳态和动态特性进行了仿真研究,结果曲线符合异步机动静态规律,对预估系统特性有一定指导作用.     

由IGBT组成的降压BUCK电路的建模及应用仿真

本文利用Matlab仿真软件,建立由IGBT元件组成的Buck降压电路的仿真模型,针对其工作原理,选择电容、电感、脉冲频率等技术参数,仿真系统效果,分析BUCK降压电路的作用及效果。     

电网仿真系统在电网规划中的应用

分析了电网规划工作的特点、要求，认为利用电网仿真系统性能良好的图形数据一体化环境、事件操作与事件处理、动态稳定计算等成果进行电网规划是可行的。设计、开发了电网仿真系统中的电网规划软件。将电网规划功能加入电网仿真系统满足了用户进行电网规划的要求，且拓宽了电网仿真系统的应用领域，具有现实意义和实用价值。     

Method for tumor recognition with short dynamic PET images: theory and simulation study

A new method was provided in this paper to recognize tumor in PET images automatically and reduce the waiting time of patient. Based on the unsupervised clustering algorithm (ISODATA), this method diagnoses tumor with short dynamic PET images. The theoretical basis of this method is that the metabolic characteristics of different tissues, represented by time activity curve in the region of interest, are distinctive. The computer program was developed and validated using simulated dynamic PET data with small tumor in lung. Simulation study shows that, this method could recognize tumor with the short dynamic PET data in 10 min successfully, and this method was not sensitive to initial cluster center.     

智能化人口-经济发展战略决策支持系统CDSS

本文提出将基于人工智能技术、运用知识和推理的专家系统与基于数字仿真技术、运用数据和模型的仿真模型体系相集成的智能化决策支持系统CDSS。CDSS用领域专家的知识选择和组合模型,完成问题的推理和系统的仿真运行。系统支持决策过程的各阶段并通过人-机界面实现定性与定量相结合的交互式决策。其系统结构对解决管理科学中非结构化问题具有普遍适用的价值。     

钢管定长控制系统与计算机图形仿真

介绍了一种利用计算机图形仿真的实验方法来调试 PL C控制系统 ,使得整个控制系统的调试过程直观、方便、经济实用     

机械端面密封动力学的发展概况

论述了机械端面密封(包括接触式和非接触式)的动态特征,以及对影响动态特性的因素所作的试验研究和理论分析。这些因素中主要包括密封端面间流体膜效应(例如刚度、阻尼和相变等)和密封环组件,并着重考虑了密封端面表面形貌(包括波度、粗糙度和径向锥度)。针对未来机械端面密封技术的发展,特别是密封动力学的研究,提出了几个建议。     

Towards an Object-oriented Simulation World View

ＴｏｗａｒｄｓａｎＯｂｊｅｃｔ－ｏｒｉｅｎｔｅｄＳｉｍｕｌａｔｉｏｎＷｏｒｌｄＶｉｅｗＦＥＮＧＨｕｉｊｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＥｃｏｎｏｍｉｃＭａｎａｇｅｍｅｎｔＳｈｉｊｉａｚｈｕａｎｇＲａｉｌｗａｙＩｎｓｔｉｔｕｔｅＳｈｉｊｉａｚｈｕａｎｇ，...     

Simulation Modeling by Fuzzy Nets

Fuzzy technology is a newly developed discipline based on fuzzy mathematics. In the recent years, it has been successfully applied into many areas, such as process control, diagnosis,evaluation, decision making and scheduling, especially in simulation where accurate mathematical models can not or very hard be established. In this paper, to meet the demands of fuzzy simulation, two fuzzy nets will first be presented, which are quite suitable for modeling the parallel or concurrent systems with fuzzy behavior. Then, a concept of active simulation will be introduced, in which the simulation model not only can show its fuzzy behavior, but also has a certain ability which can actively perform many very useful actions, such as automatic warning, realtime monitoring, simulation re-sult checking, simulation model self-adapting, error recovery, simulating path tracing, system states inspecting and exception handling, by a unified approach while some specified events occur. The simulation model described by this