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行波管慢波结构接触热阻的软件模拟
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摘要
基于多点接触理论建立了行波管慢波结构接触热阻的计算模型,模型的基本尺寸取自双频段毫米波螺旋慢波结构的设计模型,该模型综合考虑了界面粗糙度、界面压力、界面温度、镀膜与否等参量对界面接触热阻的影响,同时也考虑到了材料热导率随温度变化的特点以及通过界面间隙的辐射换热效应。在此基础上,利用ANSYS模拟仿真在不同参数下,由接触热阻引起的温差随接触间隙比以及接触凸体高度的变化趋势。该文所建立的计算模型及软件模拟方法能有效的仿真不同条件下行波管接触热阻的变化规律,也为以后行波管慢波结构的热分析提供给了一种新途径。
Based on the multipoint contact theory, the computational model of TWT slow-wave structure was established,and the basic parameters of the computation of thermal resistance model can be derived from the basic size of dual-band millimeter wave helix slow wave structure, the model can simulate the influence of interface roughness, interface pressure and interface temperature, coating or not on the interface contact thermal resistance, while taking into consideration the material thermal conductivity changing with temperature as well as through the interface between the characteristics of radiation for heating. Applying for ANSYS to simulate under different parameters, the contact thermal resistance temperature difference was caused by contact gap ratio and the height of contact convex body. In this paper, the established model and software simulation method can effectively work out under different conditions, the change tendency of contact thermal resistance for TWT slow-wave structure can also offer a new method for thermal analysis in the future.
引文
[1]刘冬欢,王飞,曾凡文等.高温接触热阻的有限元模拟方法[J],工程力学,2012,29(9):375-379Liu Dong-huan,Wang Fei.Finite element simulation method of high temperature thermal contact resistance[J].Engineering Mechanics,2012,29(9):375-379
    [2]王安良,赵剑锋.接触热阻预测的研究综述[J].中国科学:技术科学,2011,41(5):545-556Wang A L,Zhao J F.Review of prediction for thermal contact resistance.Sci China Tech Sci.2011,41(5):545-556
    [3]杨华威,袁广江,肖刘,ANSYS接触单元在接触热阻仿真中的应用[J],微波学报,2012:241-244Yang Hua-wei,Yuan Guang-jiang,Xiao Liu.Application of Ansys contact element in simulation of thermal contact resistance[J],Journal of Microwaves,2012:241-244

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