空间可展机构弹性动力学特性研究  

On Elastodynamic Characteristics of Space Deployable Mechanism

作　　者：张春[1] 王三民[1] 袁茹[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《机械科学与技术》2007年第11期1479-1482,1489,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：陕西省自然科学基础研究计划项目(2005E228)资助

摘　　要：将多级剪刀机构与复式螺旋机构组合,提出了一种新型的径射状可展天线伸展机构。采用动力有限元法建立空间可展天线伸展机构的单支机构动力学模型,采用振型叠加法对该机构进行弹性动力学分析。分析后发现,各阶固有频率随展开角度的不断变大会发生交叉,得出了天线展开速度、结构参数对系统稳定性的影响规律。为研究可展机构振动稳定性条件提供必要的参考数据,并为该天线的伸展机构设计与结构参数优化提供了依据。Combining the multistage linkage with a twin-screw thread transmission, we present a new deployable mechanism of a radial deployable antenna. We first build the dynamic model of the mechanism with finite elelment method（FEM）, and then analyzed the model by the vibrating mode stacking method. Analysis result shows that as the deployed angle becomes larger, some orders of the natural frequency on specific points overlap each other. The influence of the deployed velocity and structure parameters on the stability of the system was also studied, and some useful conclusions are given.

关 键 词：空间天线 径向可展 动力有限元 弹性动力学 振型叠加 

分 类 号：TH113.1[机械工程—机械设计及理论]