光学精密工程2025，Vol.33Issue(10)：1584-1593,10.DOI:10.37188/OPE.20253310.1584
压电四维测力仪扭矩测量精度提升
Improvement of torque measurement accuracY in piezoelectric four-dimensional force sensors
摘要
Abstract
In current piezoelectric four-dimensional force measurement methods,torque is determined through two approaches:calculation based on lateral forces or direct measurement.The calculation meth-od offers broad applicability but is significantly affected by cross-coupling between force components,while direct measurement theoretically achieves higher accuracy but is constrained by sensor arrangement limitations.This paper proposed a novel four-dimensional force measurement solution that enabled direct torque measurement without relying on specialized sensor configurations by incorporating quartz crystal sets within the sensor.First,the sensor layout scheme was determined.Based on the existing three-axis force measurement,additional shear force measurement crystal groups were incorporated into each sensor to measure torque.The errors in sensor machining and assembly processes were defined,and a torque measurement error transmission model was established for both measurement methods.A numerical simu-lation was conducted to compare the accuracy differences between the two methods.A force measuring in-strument was designed and fabricated,and the key dimensions of the instrument were analyzed parametri-cally.Static and dynamic performance calibration experiments were carried out,followed by a multi-point torque loading calibration experiment,in which torque was calculated using both measurement schemes.Experimental results show that the maximum nonlinearity error and repeatability error of the force measur-ing instrument are both less than 0.5%,the inter-axis interference is less than 3%,and the natural fre-quency of each axis exceeds 1 400 Hz,meeting the design requirements for static and dynamic perfor-mance.In the multi-point torque loading experiment,the root mean square error of the new scheme is re-duced by 83.4%,and the maximum measurement error is reduced by 26.5%.These results verify the ef-fectiveness of the new scheme in improving torque measurement accuracy,demonstrating its broad applica-tion potential.关键词
扭矩测试精度/四维力测量/四向力传感器/测力仪设计/参数化分析Key words
torque measurement accuracy/four-dimensional force measurement/four-axis force sensor/force measurement instrument design/parametric analysis分类
数理科学引用本文复制引用
张军,张鹏,滕玄德,蔡佳乐,王郁赫,任宗金..压电四维测力仪扭矩测量精度提升[J].光学精密工程,2025,33(10):1584-1593,10.基金项目
国家自然科学基金支持项目(No.52125504) （No.52125504）
