力限技术的发展和应用前景

在航天器振动试验中引起过试验的主要原因是试验件安装结构和振动台的阻抗不同及制订加速度输入谱时采用包络法.解决此问题的一种思路是在振动中限制试验件安装界面的力,即力限技术,它包括力谱制订、力的测量方法、夹具设计和振动控制策略等关键技术.文章回顾了国外力限技术的发展,介绍了力限技术应用的关键技术问题,并对在我国航天器振动试验中力限技术的应用前景进行了展望.

DEVELOPMENT AND APPLICATION PROSPECTS OF FORCE LIMITED TECHNIQUE

The primary cause of vibration overtesting is associated with the difference of impedance between mounting structure of test item and shaker,and the practice of enveloping acceleration spectra to generate a vibration test specification.A way to solve this problem is to limit the force between test item and shaker in vibration test,namely force limited technique.Its key techniques consist of calculating force spectrum,force measurement,fixture design,and vibration control stratege.In this paper,the development of force limited technique in foreign countries is reviewed.The key techniques of force limited application are introduced.The application prospects of force limited technique in vibration testing of spacecraft in our country are given.