外熱流模擬對(duì)象在線辨識(shí)方法比較分析

Comparison and analysis of on-line identification methods applied to space heat flux simulating objects

摘要: 用紅外加熱籠進(jìn)行航天器外熱流模擬時(shí)，要獲得熱流、溫度的優(yōu)良控制品質(zhì)，前提是需要準(zhǔn)確辨識(shí)被控對(duì)象模型。文章選取兩次航天器熱真空試驗(yàn)、多個(gè)回路實(shí)際測(cè)量數(shù)據(jù)，通過比較常見的3種辨識(shí)方法的辨識(shí)效果，認(rèn)為相對(duì)于其它兩種辨識(shí)方法，近似極大似然遞推算法具有抗干擾能力強(qiáng)、適應(yīng)不同噪聲環(huán)境、參數(shù)穩(wěn)定收斂等優(yōu)點(diǎn)。

Abstract: In using infrared heating cage to simulate external heat flux on spacecraft, a fine control of heat flux or temperature requires an accurate identification of the temperature model. This paper compares three commonly used system identification methods applied to test data derived from two separate thermal vacuum tests and a multi-loop measurement. It is shown that the approximate maximum likelihood estimation is the best with its strong adaptability to various noise environments. The parameters identified by this method are stable and convergent.

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