随着参试产品尺寸不断增大,试验规模也不断扩大,传统的容栅式位移传感器已经不能适应型号试验发展的需求.室内空间测量定位系统(workspace measuring position system,简称wMPS)是一种基于光平面交会定位原理的大型结构网络式测量系统,在空间三维坐标测量方面有着广阔的应用前景.本文针对航天器结构静力试验中仅关注被测量点相对变形的特点,利用wMPS系统的角度测量数学模型,辅以激光测距,对测量系统进行优化,实现了目标点的轴向位移和径向位移同时测量.该方法具有多点实时测量与跟踪,精度高,试验前无需标定,安装简便等特点.试验表明,wMPS系统测量误差小于0.1mm,完全可以替代传统的容栅式位移传感器.%The traditional capacitance-grate type displacement sensor will not being met the requirement of model testing development, as the sample becomes larger and test scale is extending. Workspace measuring position system (wMPS) is a novel large-scale measuring position system, which is based on light-plane intersection, and has a well foreground of application on special coordinate measurement. In a static test of spacecraft fabric, there is an attention on relative distortion of the measuring point. The article achieved the measurement of both axial and radial displacement of target points, with a supplement of laser ranging and optimization of measuring system. The system had many characteristics, such as multimetering, high precision, none calibration before examination, portable fixing, etc. As a result, measuring error of wMPS was less than 0.1mm, which could replace the traditional capacitance-grate type displacement sensor.
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