压电测力仪的联立标定方法研究
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摘要
针对四支点布置形式压电测力仪标定时力解耦困难和测试受力状态与标定时不一致的问题,提出了联立标定法。基于测力仪测试模型,建立了力电关系方程组,推导出力电转换系数模型,并进行了扰动分析和误差传递分析。在测力仪上表面选取均布的21个特征点,进行加载实验,计算测试力值,并分析测试误差在上表面的分布情况。实验结果表明:在测力仪上表面,联立标定法最大测试误差仅为0. 376%,线性度在0. 33%以内,重复性在0. 26%以内。证明在测力仪上表面,联立标定法的测试精度均很高,标定方法有效。
Aiming at the problem of difficulty of force decoupling and inconformity between test stress state and calibration when piezoelectric dynamometer with four point layout is used,a simultaneous calibration is put forward. Based on the test model of dynamometer,a force-electricity equation is set up,the model for forceelectricity conversion coefficient is derived,and the disturbance analysis and error transfer analysis are carried out.21 characteristic points are selected on the surface of the dynamometer,the loading experiment is carried out,the test force value is calculated and the distribution of the test error on the upper surface is analyzed. Experimental results show that the maximum test error of the simultaneous calibration method is only 0. 376 %,the linearity is less than 0. 33 %,and the repeatability is less than 0. 26 %. It proves that the simultaneous calibration has high precision and the calibration method is effective on the upper surface of dynamometer.
Aiming at the problem of difficulty of force decoupling and inconformity between test stress state and calibration when piezoelectric dynamometer with four point layout is used,a simultaneous calibration is put forward. Based on the test model of dynamometer,a force-electricity equation is set up,the model for forceelectricity conversion coefficient is derived,and the disturbance analysis and error transfer analysis are carried out.21 characteristic points are selected on the surface of the dynamometer,the loading experiment is carried out,the test force value is calculated and the distribution of the test error on the upper surface is analyzed. Experimental results show that the maximum test error of the simultaneous calibration method is only 0. 376 %,the linearity is less than 0. 33 %,and the repeatability is less than 0. 26 %. It proves that the simultaneous calibration has high precision and the calibration method is effective on the upper surface of dynamometer.
引文
[1]孙宝元,张贻恭.压电石英力传感器及动态切削测力仪[M].北京:计量出版社出版,1985:89-91.
[2]孙宝元,钱敏,张军.压电式传感器与测力仪研发回顾与发展[J].大连理工大学学报,2001,41(2):123-134.
[3] LI Y J,SUN B Y,ZHANG J,et al. A novel parallel piezoelectric six-axis heavy force/torque sensor[J]. Measurement,2009,4(25):730-736.
[4]贾正元,高翼飞,任宗金,等.六维力压电天平研制与静态性能测试研究[J].大连理工大学学报,2014,54(1):43-47.
[5] XING Q,ZHANG J,QIAN M,et al. Thrust stand for low-thrust liquid pulsed rocket engines[J]. Review of Scientific Instruments,2010,81(9):095-102.
[6] GAO C Y,SUN B Y. Investigation of the piezoelectric thrust test stand for rocket engine[J]. IET Science,Measurement and Technology,2009,3(6):395-402.
[7]陈修平.月面软着陆火箭发动机推力矢量测试系统研究[D].大连:大连理工大学,2013:74-76.
[8] WRIGHT A M,WRIGHT A B,BORN T,et al. A six degree-offreedom thrust sensor for a lab scale hybrid rocket[J]. Measurement Science and Technology,2013,40(1):44-49.
[9]张军,齐亚洲,任宗金,等.标定偏心下压电力传感器测试精度研究[J].压电与声光,2017,39(6):873-877.
[10]辛学亭.双发并联推力测试系统的标定研究[D].大连:大连理工大学,2016:50-52.
[2]孙宝元,钱敏,张军.压电式传感器与测力仪研发回顾与发展[J].大连理工大学学报,2001,41(2):123-134.
[3] LI Y J,SUN B Y,ZHANG J,et al. A novel parallel piezoelectric six-axis heavy force/torque sensor[J]. Measurement,2009,4(25):730-736.
[4]贾正元,高翼飞,任宗金,等.六维力压电天平研制与静态性能测试研究[J].大连理工大学学报,2014,54(1):43-47.
[5] XING Q,ZHANG J,QIAN M,et al. Thrust stand for low-thrust liquid pulsed rocket engines[J]. Review of Scientific Instruments,2010,81(9):095-102.
[6] GAO C Y,SUN B Y. Investigation of the piezoelectric thrust test stand for rocket engine[J]. IET Science,Measurement and Technology,2009,3(6):395-402.
[7]陈修平.月面软着陆火箭发动机推力矢量测试系统研究[D].大连:大连理工大学,2013:74-76.
[8] WRIGHT A M,WRIGHT A B,BORN T,et al. A six degree-offreedom thrust sensor for a lab scale hybrid rocket[J]. Measurement Science and Technology,2013,40(1):44-49.
[9]张军,齐亚洲,任宗金,等.标定偏心下压电力传感器测试精度研究[J].压电与声光,2017,39(6):873-877.
[10]辛学亭.双发并联推力测试系统的标定研究[D].大连:大连理工大学,2016:50-52.