航空机载相控阵雷达作为一种典型高密度电子元器件集成系统(Multi-Chip Module,MCM)对高温环境较为敏感,散热设计问题已成为制约其发展的瓶颈问题.针对航空机载相控阵雷达系统多芯片组件热源结构分析基础上,采用小人法对对问题进行创新分析并获得了相应创新设计方法.通过在热源下分布设置银质合金导热柱将热源的热量直接传导至冷板表面,并采用散热风道开口平滑设计避免因风道截面积突变而引起的冷却空气流局部受阻问题.针对某型号机载相控阵雷达接收组件的风冷散热结构进行设计,并通过热力学计算和lcepak软件对散热结构方案温度场进行相应热分析、模拟仿真和系统压力校核,验证设计方案的有效性.
Due to the dramatic changes during the course of missile fight,the temperature and thermal load of fairing skin have a rapid change,and that will bring a great influence on the oper-ational performance of the missile.To ensure the design accuracy of the electronic device,a design calculation method based on the fluid-solid coupling nonstationary numerical simulation was proposed.Meanwhile,by solving the heat transfer equation of the fluid and the solid surface, the energy piecewise function of each point in the flow field was obtained.The piecewise function of transient power curve corresponding to each structure microelement of flow field was calculated by MATLAB software,and the Fluent thermal simulation analysis method was used to predict the transient variation of working temperature and ambient temperature of the whole mis-sile-borne electronic equipment intuitively through the power curve piecewise function.By the study of aerodynamic heating problem of a type of anti-radiation seeker and its missile-borne elec-tronic equipment,the space distribution of transient thermal every moment in the flow field of the seeker and its missile-borne electronic equipment was calculated,and the obtained results were in good a-greement with the practice.The results show that the method has a certain reference for transient thermal analysis and corresponding heat dissipation design of similar electronic devices.
A testing software for a kind of multi-serial ports intelligent card to test its communication performance is designed.The testing system is developed by the software LabWindows/CVI which always being used as the virtual instrument development tool for its powerful function.Most of the existent serial ports testing software can not communicate by more than one port at the same time,or read or write even a byte to the card memory.But this design can easily solve the problem.It tests the communication performance of the multi-serial ports card accurately and objectively.Simultaneously,a new method is provided to simplify programs.
