小卫星声-振联合试验耦合响应分析及预估

卫星在主动段承受发动机脉动推力和气动噪声激励复合作用下的振动环境。以整星模型为试验对象,分别开展了卫星的振动台随机振动试验、噪声试验和声-振联合试验。对3组试验结果的对比分析发现,声-振联合试验中,基础激励和噪声激励对不同结构处响应在低频段和中高频段具有不同的影响规律。在此基础上,提出了一种工程应用方法,即用振动台试验和噪声试验的响应极值包络法以及线性叠加法以预示声-振联合试验的响应。

Analysis and estimation of satellite coupling responses in vibro-acoustic test

The satellite encounters a vibro-acoustic environment in the powered phase caused by the pulsating and the thrust of the engine and the aerodynamic noise. The random vibration test, the acoustic noise test and the vibro-acoustic test are carried out separately for a satellite model. By comparing these results, it is found that at different frequency ranges, the base vibration and the acoustic noise have different effects on the structure''s vibro-acoustic response. Based on this, a method is proposed to predict the vibro-acoustic response using the sum or the extremum envelope of the vibration and noise responses.