一种浮动锁销式柔性气浮组件的承载特性测试及分析

为在空间机构产品集成与测试中合理使用气浮组件,采用刚度试验台模拟加载的方案对一种浮动锁销式柔性气浮组件的承载特性进行测试。试验结果表明:浮动锁销式柔性气浮组件在未预压缩状态下,承载特性近似为线性弹簧压缩模型;在预压缩状态下,初始承载特性近似为刚体,承载力超过气浮组件的保持力后承载特性近似为线性弹簧压缩模型。因此,为避免气浮组件在承载过程中表现出的作用力与位移变化等特性对空间机构产品的运动特性、系统性能造成显著的附加影响,气浮组件在使用前应根据产品重力调节弹簧预压缩量,并严格控制4组可调弹簧支撑组件的制造误差;同时,在产品重力完全被卸载之前需要借助压紧释放机构或刚性支撑工装对产品进行约束。

Experimental analysis of the bearing characteristics of a floating lockpin type flexible flotation device

In order to use the flotation device reasonably in the product integration and the test of the space mechanism, the bearing characteristics of a floating lockpin type flexible flotation device are tested by using a stiffness test bed under an analog loading. The results show that the bearing characteristics of the flotation device can be approximated by a linear spring compression model for the flotation device not being pre-compressed. When the flotation device is pre-compressed, the bearing characteristics of the flotation device can be approximated by a rigid body in the initial stage. As the bearing capacity exceeds the holding force of the flotation device, the bearing characteristics of the flotation device can be approximated by a linear spring compression model. In order to avoid the serious influence of the change of force and displacement in the loading process of the flotation device on the motion characteristics and the system performance of the space mechanism, the spring pre-compression of the flotation device should be adjusted according to the gravity product before the flotation device is used. In addition, the manufacturing errors of four groups of adjustable spring support assemblies should be strictly controlled. Moreover, the product should be constrained by using a release mechanism or a rigid support device before the gravity of the product is completely balanced.