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真空熱試驗中閉環(huán)溫度控制參數(shù)分析

Parameter analysis for closed-loop temperature control in vacuum thermal test

  • 摘要: 為了滿足航天器真空熱試驗溫度控制的新要求，文章通過對控制參數(shù)與溫度控制設(shè)定目標(biāo)值之間數(shù)值關(guān)系的分析與研究，得出通過電阻性加熱器加熱、以輻射換熱為主要加熱途徑的溫控系統(tǒng)對象，最優(yōu)比例參數(shù)Kc值與目標(biāo)設(shè)定溫度成近似正比關(guān)系，積分參數(shù)Ti值可取固定值，微分參數(shù)Td對控制動態(tài)品質(zhì)影響可忽略。具有上述特性的系統(tǒng)可使用參數(shù)尋找方法：即在真空熱試驗之前通過熱響應(yīng)曲線套用公式確定該對象的數(shù)學(xué)模型，然后使用數(shù)值分析的方法，尋找最優(yōu)的PID參數(shù)。通過這種預(yù)先估計PID控制參數(shù)方法，可以改善電阻特性類控溫系統(tǒng)的控制品質(zhì)。

     

    Abstract: In accordance with the new requirement of temperature control in satellite vacuum thermal test, the relationship between the control parameter and the set value is analyzed. It is indicated that the relationship between the proportional gain Kc and the set value is approximately directly proportional, the integral time Ti can be selected as a constant, and the differential time Td can be neglected because of its little effect. These parameter selection methods and rules can be used before vacuum thermal test. The control parameter can be obtained through the thermal response test before the test. This method can improve the closed-loop temperature control performance, thus increase the automation level, the stability and reliability of the temperature control system.

     

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