基于加权平均的机载雷达天线随机振动激励条件分解与应用  

Design and Verification of a Composite Space-Borne Antenna Reflector Under Mechanical Environment

作　　者：彭超[1] 王平安[1] 张平[1] PENG Chao;WANG Ping’an;ZHANG Ping(No.38 Research Institute of CETC,Hefei 230088,China)

机构地区：[1]中国电子科技集团公司第三十八研究所,安徽合肥230088

出　　处：《机械与电子》2021年第7期28-32,39,共6页Machinery & Electronics

基　　金：合肥市自然科学基金资助项目(2021044)。

摘　　要：针对大型雷达天线的随机振动分析,开展基于加权平均的随机振动激励条件分解方法研究。分别描述了随机振动仿真分析中激励施加方法和随机振动试验中常用的加权平均控制方法,并指出上述两者在大型雷达天线中存在着明显差异问题。将试验中多点加权平均控制思想引入到随机振动分析中,并结合随机振动的传递特性,提出了一种基于加权平均的机载雷达天线随机振动激励条件分解方法。对该方法的具体过程进行了详细描述,并将该方法应用到某大型机载雷达天线中。应用和试验结果表明,相比于按照统一条件激励的常规分析方法,采用基于加权平均的随机振动激励条件分解后的条件对天线进行激励,其分析结果能更好地匹配试验结果,进一步提高大型天线随机振动仿真分析的准确性。Aiming at the random vibration analysis of large radar antennas,research on the decomposition method of random vibration excitation conditions based on weighted average is carried out.It describes the excitation application method in random vibration simulation analysis and the weighted average control method commonly used in random vibration test respectively,and points out that there are obvious differences between the two in large radar antennas.The idea of multipoint weighted average control in the experiment is introduced into random vibration analysis,and combined with the transfer characteristics of random vibration,a weighted averagebased random vibration excitation condition decomposition method for airborne radar antennas is proposed.The specific process of the method is described in detail,and the method is applied to a large airborne radar antenna.The application and test results show that:compared with the conventional analysis method of excitation according to uniform conditions,the conditions after the decomposition of the random vibration excitation conditions based on the weighted average are used to excite the antenna,and the analysis results can better match the test results and further improve the accuracy of random vibration simulation analysis for large antennas.

关 键 词：雷达天线 随机振动 条件分解 环境试验 仿真分析 

分 类 号：TH113[机械工程—机械设计及理论]