热场作用下预紧结构与压电传感器输出的研究
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Study on Pretightening Structure and the Output of Piezoelectric Sensor under Thermal Field
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    摘要:

    压电石英三向力传感器受热影响会导致输出信号产生偏差。基于温度均匀分布假设分析了压电传感器预紧结构在温度影响下的热变形规律,得出施加在压电石英上的热应力是传感器输出信号偏差的主要原因的结论。利用有限元软件对预紧结构加热过程中压电石英所受载荷变化过程进行分析,结果表明,随着热量的流入,压电石英在预紧力施加的方向上的应力变化为-3 315 kPa。最后,基于信号偏差的分析结论改进传感器的预紧结构,并设计对比实验进行验证。在240 s的加热过程中,改进后测力仪的预紧方向输出信号变化不大于4 mV,能够抑制由温度变化引起的输出信号偏差,提高测试准确性。

    Abstract:

    Signal of piezoelectric quartz force sensor has an offset in the influence of thermal. The thermal deformation of pretightening structure is analyzed under the hypothesis of uniform temperature, indicating that the thermal stress is the main reason of the offset. The change of thermal stress is analyzed by FEA software. The result shows that thermal stress of the piezoelectric quartz changes -3 315 kPa on the pretightening exerted direction. Finally the preload structure is improved and a contrast experiment is designed. During 240 s process of heating, the output of improved dynamometer on the pretightening exerted direction changes less than 4 mV, which indicates that the improved dynamometer can restrain the offset in the influence of thermal and improve the accuracy of measurement.

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张军,田丰,钱敏,齐亚州.热场作用下预紧结构与压电传感器输出的研究[J].压电与声光,2015,37(6):995-998. ZHANG Jun, TIAN Feng, QIAN Min, QI Yazhou. Study on Pretightening Structure and the Output of Piezoelectric Sensor under Thermal Field[J]. PIEZOELECTRICS AND ACOUSTOOPTICS

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  • 在线发布日期: 2015-12-16
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