基于FE-SEA方法的衛(wèi)星部組件隨機振動條件研究
Random vibration specification for spacecraft components based on the hybrid FE-SEA method
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摘要: 衛(wèi)星部組件的隨機振動試驗條件確定是較為困難的,，通常依據(jù)以往試驗結(jié)果和經(jīng)驗給出,。文章嘗試應(yīng)用混合有限元-統(tǒng)計能量分析方法（FE-SEA方法）預(yù)示衛(wèi)星部組件的隨機振動環(huán)境，以此確定星上部組件的隨機振動試驗條件,。文章首先介紹了該方法的基本理論,；隨后，用該方法對衛(wèi)星部組件在星箭界面基礎(chǔ)激勵和外場聲激勵聯(lián)合作用下的加速度響應(yīng)進行了分析,；最后,，在綜合考慮預(yù)示結(jié)果和工藝檢驗要求的基礎(chǔ)上，探討了部組件隨機振動條件的確定方法,。研究結(jié)果表明：FE-SEA方法建模簡便,，適用于組合載荷作用下的寬頻隨機振動響應(yīng)預(yù)示，并且,，可以較為方便地確定部組件隨機振動條件,。Abstract: It is very difficult to specify appropriate random vibration test inputs for spacecraft components, which are usually given in terms of test results or experiences. In this paper, a new technique based on the hybrid FE-SEA method is applied to the prediction of the random vibration environment, and the random vibration as specified by the predictive results is studied. Firstly, the formulation of the hybrid FE-SEA method is briefly discussed. Then, the acceleration power spectral densities for components are computed by the FE-SEA method under the combined loads of the external acoustic loads and the direct mechanical vibration inputs from the interface between the launch vehicle and the spacecraft. Finally, an approach is proposed to specify random vibration test inputs for components in consideration of the predictive results and the technical inspection requirements. It is concluded that FE-SEA is efficient in the modeling work, is especially suitable for the prediction of component responses under combined loads, and is convenient to be applied in specifying the random vibration inputs.
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