压电测力仪尺寸参数对测试精度影响研究
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摘要
针对大量程比、小力值压电测力仪,分析了测力仪结构尺寸对测试精度的影响。采用理论与有限元分析相结合的方式分析可得,测力仪自身刚度不足引起的变形将增大测力仪向间干扰,降低测试精度。测力仪上盖厚度、中心孔径及传感器跨距尺寸参数是导致测力仪刚度不足,影响测力仪测试精度的关键因素。通过对某小力值测力仪进行尺寸参数优化设计,各项固有频率均在4kHz以上,动态性能优良;标称力值作用下,最大向间干扰为3.33%,测试精度提高33.4%。
For a large range of ratio and small force piezoelectric dynamometer,the influence of the structure size on the test accuracy is analyzed.The result shows that the deformation caused by the insufficient stiffness of the dynamometer itself leads to the increase of inter-interference between dynamometers and the decrease of test accuracy by combining the theory and finite element analysis.The upper cover thickness,the central aperture and the sensor span parameter are the key factors that cause the stiffness of the dynamometer to be insufficient and affect the accuracy of the dynamometer test.By optimizing the size parameters of a small force dynamometer,all the natural frequencies are above 4 kHz,and the dynamic performance is excellent.Under the action of nominal force,the maximum inter-interference is 3.33% and the test accuracy is improved by 33.4%.
For a large range of ratio and small force piezoelectric dynamometer,the influence of the structure size on the test accuracy is analyzed.The result shows that the deformation caused by the insufficient stiffness of the dynamometer itself leads to the increase of inter-interference between dynamometers and the decrease of test accuracy by combining the theory and finite element analysis.The upper cover thickness,the central aperture and the sensor span parameter are the key factors that cause the stiffness of the dynamometer to be insufficient and affect the accuracy of the dynamometer test.By optimizing the size parameters of a small force dynamometer,all the natural frequencies are above 4 kHz,and the dynamic performance is excellent.Under the action of nominal force,the maximum inter-interference is 3.33% and the test accuracy is improved by 33.4%.
引文
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[2] PANZERA T H,SOUZA P R,RUBIO J C C,et al.Development of a three-component dynamometer to measure turning force[J].The International Journal of Advanced Manufacturing Technology,2012,62(9/12):913-922.
[3] XING Qin,ZHANG Jun,QIAN Min,et al.Design calibration and error analysis of a piezoelectric thrust dynamometer for small thrust liquid pulsed rocket engines[J].Measurement,2011,44(2):338-344.
[4]任宗金,贾振元,王浩然,等.基于压电式传感器的力矢量测量模型研究[J].压电与声光,2012,34(3):380-383.REN Zongjin,JIA Zhenyuan,WANG Haoran,et al.Research on the force vector measurement model based on the piezoelectric sensor[J].Piezoelectrics&Acoustooptics,2012,34(3):380-383.
[5] XING Qin,ZHANG Jun,QIAN Min,et al.Design and optimization of a piezoelectric thrust-measuring platform for attitude-control rocket engines[J].Applied Mechanics and Materials,2011,44:1977-1981.
[6]史乃青.小力值推力矢量测试研究[D].大连:大连理工大学,2015.