力传感器动态灵敏系数的辨识方法研究

doi:10.3969/j.issn.1000-1158.2024.11.15

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摘要采用“静标动用”的原则获取静态灵敏度是力传感器动态校准的传统方法,但敏感材料微弱的非线性时变特性往往会引起灵敏度漂移,从而产生较大的动态测量误差。因此,提出一种力传感器动态灵敏系数辨识方法。该方法在不同激振频率下获得被校准力传感器的核函数矩阵,采用正则化方法修正核函数矩阵的奇异值,建立动态灵敏系数矩阵辨识模型。为了验证该方法的准确性,采用正弦力校准装置对力传感器进行动态校准,辨识其动态灵敏系数。实验结果表明,该方法辨识的平均相对误差为7.05%,算术平均值的标准差为1.18,分别比传统方法降低了65.86%和88.00%,有效改善了被校准力传感器的动态测量性能。

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	刘晶晶
	江文松
	罗哉
	王岩庆
	尹肖

关键词 ：力学计量, 力传感器, 正则化, 动态灵敏系数, 动态辨识

Abstract：To reduce the large measurement error caused by the weak nonlinear time-varying characteristics of sensitive materials during dynamic measurement, an identification method of dynamic sensitivity coefficient of force transducer is proposed. First, the kernel function matrix of the calibrated force transducer is obtained at different excitation frequencies; second, the singular value of kernel function matrix is modified by regularization method, and the identification model of dynamic sensitivity coefficient matrix is established. To verify the accuracy of the method, a sinusoidal force calibration device is used to calibrate the force transducer dynamically, and its dynamic sensitivity coefficient is identified. The experimental results show that the mean relative error of the identification method is 7.05%, and the standard deviation of arithmetic mean is 1.18, which are reduced by 65.86% and 88.00% compared with the traditional method. In all, this method can improve the dynamic performance of the calibrated force transducer.

Key words： mechanical metrology force transducer regularization dynamic sensitivity coefficient dynamic identification

收稿日期: 2023-03-17 发布日期: 2024-11-29

PACS:

TB931

基金资助:国家自然科学基金(52005471,52075511);国家市场监督管理总局科技计划(2021MK189);浙江省大学生科研创新活动计划(2022R409A038)

通讯作者: 江文松(1988-),男,安徽安庆人,中国计量大学副教授,主要从事动态力计量与校准技术方面研究。Email: jwensong@cjlu.edu.cn E-mail: jwensong@cjlu.edu.cn

作者简介: 刘晶晶(1999-),女,安徽黄山人,中国计量大学在读硕士研究生,研究方向载荷标定。Email: S21020804031@cjlu.edu.cn

引用本文:

刘晶晶,江文松,罗哉,王岩庆,尹肖. 力传感器动态灵敏系数的辨识方法研究[J]. 计量学报, 2024, 45(11): 1702-1708.
LIU Jingjing,JIANG Wensong,LUO Zai,WANG Yanqing,YIN Xiao. Research on Identification Method of Dynamic SensitivityCoefficient of Force Transducer. Acta Metrologica Sinica, 2024, 45(11): 1702-1708.

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