| 张 军,于 婧,任宗金,王成刚,田志强,陈以华.压电三向测力单元的精度提高方法研究[J].电子测量与仪器学报,2021,35(9):164-169 |
| 压电三向测力单元的精度提高方法研究 |
| Research on methods of improving the precision ofpiezoelectric force measuring unit |
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| DOI： |
| 中文关键词: 压电测力单元 夹具 装配误差 测试精度 标定 |
| 英文关键词:piezoelectric load cell fixture assembly error test accuracy calibration |
| 基金项目:国家自然科学基金（51475078,51675084）、航空科学基金（20160163001）、中央高校基本科研业务基金项目（DUT17GF211）资助 |
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| 中文摘要: |
| 随着动态力测试量程的不断增加以及对测试精度要求的提高,压电测试技术的关键性作用日益凸显,并被广泛应用于
重载设备以及航空航天的矢量力测量中。 针对压电三向测力单元装配及施加预紧力过程中出现的上下压块偏转、不同轴等问
题,基于力的分载原理对误差进行了量化,建立了测力单元的自预紧误差理论模型,并设计了新型的装配夹具,进行了两种夹具
装配下的测力单元角度偏转测试实验以及静态标定实验。 实验结果表明,使用新夹具装配的测力单元测试精度明显得到很大
提高,相间干扰最大值由 6. 06%减少为 2. 97%,为后续测力单元的精度提升途径以及相应的结构研制提供了理论支撑。 |
| 英文摘要: |
| With increase of the dynamic force test range and the improvement of test accuracy requirements, the key role of piezoelectric
test technology becomes gradually prominent, which has been widely used in heavy-duty equipment and aerospace vector force
measurement. In the process of assembling and applying preload of the piezoelectric three-way force measuring unit, problems such as
the deflection of the upper plate and lower plate and the different axis incurred. Based on the load sharing principle of force, this paper
quantifies the error and establishes a theoretical model of the self-preload error of the force measurement unit. A new type of assembly
fixture is designed, and the angle deflection test experiment and static calibration experiment of the force measuring unit assembled with
two types of fixtures are carried out. The experimental results show that the test accuracy of the force measurement unit assembled with
the new fixture has been significantly improved, and the maximum value of interphase interference is reduced from 6. 06% to 2. 97%,
which provides theoretical support for the improvement of the accuracy of the force measurement unit and the development of related
structures. |
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