偏馈式构架反射器展开冲击特性分析

As the off-fed truss reflector is connected to the platform by a single edge and deployed rapidly through being driven by the spring, the impact influence acts obviously on both the reflector and the platform. Due to limitations of the ground test, the in-orbit deployment impact characteristics of truss reflector are difficult to obtain. Then, by taking a certain reflector as the research object, a dynamic model is established with multibody dynamic software. Based on the modified model with ground deployable tests, in-orbit deployment impact characteristics are obtained by simulation analysis. Therefore, the method for multibody dynamic modeling is suitable for truss reflector dynamic research, and the result is useful for the deployable reliability optimization.     

激光跟踪绝对测长多边法三维坐标测量系统

现今随着大型工件制造、装配需求的增加,对此类产品的制造装配精度的需求也在不断地提高。高精度的测量和控制成为制约高端制造业发展的一个重要因素。对此文中研究了一种基于激光跟踪绝对测长多边法三维坐标测量系统,该系统由四台绝对距离测量激光跟踪仪和上位机构成,既充分利用了绝对激光干涉测距的精度优势和断光续接的能力,又避免了传统激光跟踪仪角度测量带来的误差。同时,为提高自标定算法的精度,提出并研究了一种依赖距离的残差模型。通过实验表明,该系统实现了在20 m大范围空间内小于20 m的测量误差,测量不确定度为12.3 m。较之单台绝对激光跟踪仪系统的精度有很大的提升,实现了在工业现场在线、高效、精密的三维坐标测量。