力限技术在航天器振动试验中的应用

为了在正弦振动试验中模拟真实的飞行环境，防止因“过试验”而导致航天器结构发生不必要的破坏，需要对试验条件进行下凹控制。在以往的加速度下凹控制方法的基础上，引入力限控制方法可以提高航天器主频处下凹控制的精度和有效性。文章分析了传统加速度下凹控制方法的局限性，并以某结构星力限控制试验为基础，阐述了结构星力限试验条件的制定方法，介绍了力限双控试验平台设计，并分析了试验结果。经分析表明，力限控制具有较高的控制精度，在加速度控制的基础上引入力限控制的“双控”试验方法，能够有效解决航天器振动试验中的“过试验”和“欠试验”问题。

Application of Force Limited Method in Vibration Test of Spacecraft

In order to simulate the real flight evrionment and avoid unnecessary structure destruction by over-testing,the sinusoidal vibration test level needs to be notched down.The accuracy and effectivness of notch-down control at the resonance frequencies of spacecraft can be improved by introducing force limited method into traditional acceleration notch-down method.In this paper,the limitaions of traditional acceleration notch-down method are disscussed;and then force limited control test on a satellite strucutal model,the test criteria,and the test platform for force limited test are introduced.The analysis shows that force limited test has high efficiency and accuracy,and the over-testing or insufficient-testing problems in spacecraft vibraiton tests can be solved by dual contral test method with force limitation.