压水堆核电厂过冷度显示的仿真

清华大学核电厂模拟培训中心模拟机的参考电厂是美国本屋公司设计的其模型中没有堆芯过冷度显示系统的模拟。根据三哩岛事故的教训，在该装置上增设过冷度显示的模拟是十分必要的。本文叙述了在原模拟机上增设过冷度显示所进行的软件设计、数据传输和显示线路设计。     

A simulator for MIMD performance prediction: application to the S-1 MkIIa multiprocessor

We describe a MIMD multiprocessor simulator and application of that simulator to a multiprocessor of current interest, the S-1 MkIIa. The simulator runs on the CRAY-1 and is designed so that computational physics benchmarks are actually run and produce results. Simulator output from this run is fed into a second level (hardware) simulator which calculates the behavior of the multiprocessor. The simulator can simulate multiprocessors whose basic architecture is that of a few, large processors with or without data caches, sharing global memory through an interconnection switch. The simulator is applied to the investigation of the behavior of four problems on the S-1: The benchmark physics code SIMPLE, a conjugate gradient linear algebra problem, a simple Monte-Carlo problem, and a new method for neutron transport calculations.     

ATMSim: An anomaly teletraffic detection measurement analysis simulator

Over the last few years, the quantity of teletraffic is rapidly growing because of the explosive increase of Internet users and its applications. The needs of collection, storage, management, analysis, and measurement of the subsequent teletraffic have emerged as some of the very important issues. To this point many studies for detecting anomaly teletraffic have been done. Detection, measurement, and analysis studies for traffic data, however, are not actively being made based on Hadoop. In this paper, some problems and solutions for those systems have been suggested. We have also designed and developed an Anomaly Teletraffic detection Measurement analysis Simulator, called the ATMSim. One strong point of the ATMSim is able to store, measure, and analyze traffic data for detecting anomaly teletraffic. The other strength is to generate sequences of input synthetic anomaly teletraffic with various network attacks for practical network security applications. All simulations were executed under the control of the ATMSim simulator to investigate how input anomaly teletraffic with network attacks can be different from real Ethernet local area network (LAN) traffic. Our numerical results show that the values of the estimated Hurst parameter obtained from the anomaly teletraffic are much higher when compared to real Ethernet LAN traffic.     

一种主/被动声呐目标回波信号模拟器的研制

根据实际需要，研制了一种主／被动声呐目标回波信号模拟器，该模拟器能够产生主／被动声呐测试、定检所需的主／被动声呐目标回波信号，目标回波信号中包含主动声呐、目标辐射噪声、海杂波、混响等信号，信号输出形式包括声信号和电信号2种。该模拟器可在空气介质条件下，实现声呐接收、处理、显示系统的定检，以及声呐测距系统和方位系统的定检；在水声环境中，可实现对接收换能器方向性、接收系统灵敏度等的测试。通过性能测试及与实际声呐系统联试，证明该模拟器达到了设计功能和性能指标要求，已交付用户使用。这里对其主要数学模型、系统硬件结构、软件流程进行了简要介绍。     

Optimisation of face-milling cutters by use of a computeraided milling-system simulator (Camss)

This paper focuses on the improvement of the cutting process in milling operations by the reduction of vibrations. For that purpose, a non-uniform chiploading pattern is considered as the design parameter, which is achieved by controlling individual insert geometry, namely axial rake and radial rake angles. In the development of the system model, a complete governing equation that describes the milling process is derived and formulated. The model can represent the closed-loop configuration that consists of the cutting process, structural dynamics and a feedback loop. Based on this model, a computer-aided milling-system simulator (CAMSS) is developed. It takes into account the forced-vibration criterion as well as the self-excited vibration to optimise the cutter geometry. Therefore, it should be able to investigate the effects of cutter geometry on chip loading and vibration. A series of comparisons showed that the optimal cutter was subject to fewer vibrations and lower cutting forces than the conventional one.     

飞行模拟器联网仿真中的视景图像抖动研究

基于某型战斗机飞行模拟器系统进行分队战术对抗模拟训练时,发现从本地模拟器视景中观察邻近的远程模拟器时被观察的实体会出现图像抖动现象,严重影响了虚拟仿真的沉浸感。首先介绍了该仿真训练系统及出现的视景图像抖动现象;接着分析了内在原因,指出模型仿真粒度的差异性和网络延迟的随机性共同作用会导致分布式系统中的不同节点出现时空不一致,该现象进一步导致了节点间仿真数据相对值出现高频抖动,当抖动平均幅值超过阈值时会在视景中表现为视觉上的图像抖动,测量了抖动阈值和实体间相对距离的关系,并论证了对相对数值进行平滑是消除视景抖动的正确途径;最后提出了基于加权滑动平均滤波的视景图像抖动消除方法并验证了其有效性。     

虚拟硫酸配酸过程控制系统的实现

以硫酸配酸过程为控制对象,采用易控组态软件、GX Simulator和MX Component软件构建虚拟硫酸配酸操作实验系统,给出了虚拟硫酸配酸实验平台的实现方法及其虚拟配酸操作的控制过程。在MX Component通信软件的支持下,易控组态软件可以在计算机上建立上位机和PLC仿真平台间的联系,实现硫酸配酸控制系统上位机控制界面与下位机PLC的同步控制和仿真操作过程。     

一种雷达多目标模拟器的主控DSP的软件设计和实现

阐述了雷达多目标模拟器的设计,给出了一种可实时模拟多批目标回波的雷达信号模拟器的实现方案,重点介绍了该模拟器主控DSP软件设计思想及其实现,对整个系统工作性能做了简要分析．     

ESD模拟器的应用研究

将ESD模拟器用金属网罩屏蔽,可减小模拟器内部继电器开关的电磁干扰.但屏蔽前后电流产生场变化不大,屏蔽后的辐射场场峰值仅稍低于未屏蔽的场.用该模拟器进行单片机系统的ESD抗扰度实验,发现屏蔽前后,同故障现象出现的最小放电电压值相差几千伏,即模拟器内部继电器开关产生的辐射场对实验结果有影响.这说明IEC标准仅仅规定ESD放电电流的波形是不够的,应对放电场做出相应规定.     

若干典型太阳能电池阵列模拟器对比分析

太阳能电池阵列在光伏发电、航天和电源制造等方面应用广泛,受光照条件、场地、实验环境等因素的限制,在很多场合只能采用太阳能电池模拟器来模拟太阳能阵列,以完成控制算法验证、系统整体测试等工作。本文介绍了太阳能阵列的输出特性规律,列举了当前国际和国内若干典型的太阳能阵列模拟器的实现方案,分析了其工作原理,对其优缺点进行了对比分析,并展望了太阳能电池阵列模拟器技术的发展趋势。