Research on calibration method for obtaining body coordinate system coefficients matrix using non-repositioning calibration system
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摘要: 介绍了一种通过测量加载头位移并进行载荷轴系转换的方式获得天平体轴系校准公式的非复位式多元静校系统。基于加载方式建立了载荷地/体轴系转换方法;优化了加载头结构以保证其上所有加载点都位于加载头的纵、横向中心对称线上,从而避免了附加力矩的产生;分析了位移测量方式引入误差的原因并给出了抑制误差的方法。比较采用此静校方法获得的天平公式与采用复位式多元加载静校系统获得的天平公式处理同一次吹风数据的结果表明,本文所述的静校方法所校天平有较为理想的综合加载重复性和综合加载精度。Abstract: A non-repositioning multi-component calibration system (BCS-100 in CAAA)is developed to study the calibration method for acquiring the body coordinate system coefficients matrix.The algorithm of loads transformation from the geodetic coordinate system to the body fixed coordinate system is established based on the loading method used by BCS-100.The config-uration of the loading sleeve is developed to avoid additional moment due to the deviation of the loading direction from the center line of the loading sleeve.The error resulted from the manner of displacement measure is analyzed and the method to reduce the error is proposed also.The differ-ences between the processed experimental result by using the matrix from BCS-100 and the result by using another matrix from a repositioning calibration system for the same balance TG618C is analyzed,and the validity of the calibration method expatiated in this paper can be confirmed.
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