分布式作战指挥模拟训练系统中语音通信仿真研究*

传统的分布式作战指挥模拟训练系统中存在通信模块可控性差、操作使用复杂等问题，为此设计和实现了新型的多功能语音通信仿真系统。提出了系统的总体结构，对系统中的语音服务器、语音客户端和通话器进行了设计，详细阐述了系统涉及的四项关键技术及其实现方案。实际应用的结果表明所设计和实现的多功能语音通信仿真系统能够满足部队指挥训练的要求。     

Simulation of Transfer Organization of Urban Public Transportation Hubs

Transfer organization of public transportation terminals has played a more important role in urban transportation management and planning. The micro-simulation software, VISSIM, is designed to model the pedestrian transfer in the Xizhimen Public Transportation Terminal (Beijing, China) in this paper. Four problems are found in the case study: severe disturbance between pedestrians and traffic flows, long transfer distances, bus waiting time and great traffic flow density. The paper proposes some measures for the solution to the problems, such as increasing the departure frequency of buses, building the crossing-street infrastructure for pedestrians, shortening transfer distances. The simulation result shows that the proposed methods in this paper are valuable in improving the efficiency of the transfer organizations of the Xizhimen Public Transportation Terminal (Beijing, China).     

数控车削加工仿真系统的研究与实现

介绍一个数控车床加工仿真系统,系统实现了对数控代码的词法、语法检验并将代码翻译成动画仿真所需的数据格式．通过在计算机上动画演示加工过程来检验数控代码的正确性．使用该系统可以实现高效率、低成本的培训．     

线接触零件磨损仿真的温度研究

磨损是摩擦学研究中的重要领域之一．然而，现行的磨损研究方法普遍采用大量的模拟试验来进行经验性的探索．而且，在磨损量计算中只考虑压力的影响．在考虑压力对磨损影响的同时，加入了温度影响因素，利用仿真技术对磨损量进行计算机模拟，提出了线接触零件磨损的数值仿真通用模型．对后续线接触零件磨损仿真的研究具有很大的指导意义．     

Numerical Simulation Research on Laser Shock Forming of Thin Metal Sheet

Laser shock forming (LSF) of sheet metal is a new technique realized by applying an impulsive pressure generated by laser-induced shock wave on the surface of metal sheet.LSF of brass sheet metal was investigated using a Q-switched Nd:YAG laser with an energy per pulse of 15～50 joules.ABAQUS software was used to simulate laser shock forming process.The central displacement of the shocked region is measured and compared with the simulation.The higher pulse energy, the higher central displacement of the shocked region were obtained.The deformation of the simulation matches the experiment quite well.     

Bi-phasic Simulation of Metal Injection Moulding： Constitutive Determinations

IntroductionMetalinjectionmolding (MIM )isexpectedtobeveryefficienttoproducesmalland 3Dcomplicatedpartsinlargeseries .Thistechnologycombinesthewell knownpolymerinjectionmouldingandpowdermetallurgytechnology .AnMIM processincludesfourmainstages[1,2 ] :them…     

基于OVM模型的交通流混沌研究

研究基于OVM模型的交通流混沌问题。用Matlab结合C 语言编写OVM模型的仿真程序来产生交通流时间序列。在一定的参数组合下,仿真研究交通流车队中不同序号的前后车辆之间的车头间距变化过程。通过分析这种车头间距变化过程的变化曲线并利用小数据量方法计算Lyapunov指数,证明了基于OVM模型产生的交通流中存在着混沌现象。讨论模型参数和仿真试验参数对该理论交通流运动状态的影响,给出相应的仿真研究结果,得出对于研究与应用交通流理论有益的结论。     

电子商务综合发运跟踪系统的研究

基于中国电子商务和物流业的发展现状，提出了采用3层开发模型实现综合发运跟踪服务的设计方案，详细讨论了数据库表设计、应用系统间信息的表示和处理、基于2层隧道协议（Layer 2 Tunneling Protocol,L2TP)的拨号虚拟专用网（Virtual Private Network,VPN)技术的网络结构设计和查询反馈关键技术的实现问题。     

A New Explicit Algorithm for Bi-Phasic Mixture Flow in MIM

Metal injection moulding (MIM) is a new technology to manufacture small intricate parts in large quantity. Numerical simulation plays an important role in its development. To predict the specific segregation effect in MIM injection, mixture theory is adopted to model the injection flow by a bi-phasic model. This model conducts to the solution of two-coupled Stokes equations. It is an extremely computational consuming solution in the scope of the traditional algorithms, which induce a serious challenge to cost-effectivity of the MIM simulation. Referred to some methods proposed by Lewis in mono-phasic simulation and the implicit algorithms in MIM simulation, a new explicit algorithm is proposed and realized to perform efficiently this type of bi-phasic flow. Numerically this algorithm is devised to perform the simulation in a fully uncoupled manner except for a global solution of the pressure field in each time step. The physical coupling is taken into account in a sequential pattern by fractional steps. This special algorithm does not need any iteration, so it is straightforward and robust, suitable for MIM simulation and other sorts of simulations for multi-phasic flow.     

基于虚拟仪器的大型旋转机组振动预测模型

为预测大型机组状态，建立了灰色预测模型．并研制了具有开放性和柔性的虚拟仪器平台下的预测系统，以适应不同用户和不同环境．该系统在LabVIEW平台下并结合VC 编程实现，在工业现场得到实际应用．在大型供水机组上应用结果表明：采用该技术可以预测机组趋势性故障13期、减少维修次数和维护费用．