Correction of Center of Gravity Measurement Error of Multi-point Weighing Method
WANG Mei-bao1,ZHANG Xiao-lin2,CHEN Li1,YU Xiao1,ZHANG Qi-yuan1
1. Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
2. School of Instrument Science and Engineering, Harbin Institute of Technology, Haerbin, Heilongjiang 150001, China
Abstract：In order to improve the accuracy of center of gravity measurement by multi-point weighing method, a method of correcting coordinates of load cells by using the total least squares method was proposed. Firstly, the principle of measuring center of gravity by multi-point weighing method and the main factors which affect the center of gravity measurement result were analyzed. Secondly, the method by using a standard samples centroid as the conventional truth value of the center of gravity to correct the coordinates of load cells was proposed. Again, a standard sample was measured more than five times by making it lay on different places. In the above position, a laser tracker was used to measure centroid coordinates of the standard sample, and convert the results to the measurement coordinate system, then the coordinates of the load cells were calculated by the total least squares method. Finally, another standard sample was measured to verify the method proposed. The experimental results show that the center of gravity measurement error is within 0.1mm, which means that the proposed method to correct the coordinates of the load cells is effective.
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2022, Vol. 43 
