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大型太陽(yáng)電池陣模態(tài)試驗(yàn)方法

Modal test for large solar array

  • 摘要: 在大型太陽(yáng)電池陣的研制階段，需要進(jìn)行大量模態(tài)試驗(yàn)以掌握結(jié)構(gòu)的固有動(dòng)態(tài)特性，進(jìn)而指導(dǎo)設(shè)計(jì)和修正有限元模型。文章以大型太陽(yáng)電池陣為研究對(duì)象，分別采用氣浮方式和懸掛方式模擬自由邊界條件，使用預(yù)緊力釋放、MB大推力激振器和APS大位移激振器3種激勵(lì)方法對(duì)其進(jìn)行試驗(yàn)，并對(duì)各種模態(tài)試驗(yàn)方法所獲取的試驗(yàn)結(jié)果進(jìn)行了分析比較。研究表明：采用懸掛方式比采用氣浮方式所測(cè)得的太陽(yáng)電池陣側(cè)擺頻率更為準(zhǔn)確；獲取太陽(yáng)電池陣模態(tài)參數(shù)行之有效的方法是先采用預(yù)緊力釋放法得到固有頻率，然后采用APS激振器激勵(lì)方法得到振型；激振器激振桿橫向剛度選擇不當(dāng)會(huì)影響模態(tài)測(cè)試結(jié)果，需選用橫向剛度較小的柔性激振桿。

     

    Abstract: Modal tests are carried out in the development stage of a large solar array to find out its dynamic characteristics to improve the design and the finite element model. In this paper, the floating method and the suspension method are used, respectively, to simulate the free boundary. Modal tests are carried out by using the preload releasing method, the excitation methods with MB exciter and APS exciter, and the test results are compared and analyzed. It is shown that the swaying frequency measured by the suspension method is more accurate than that obtained by the floating method.

     

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