基于阈值优化的压电微动平台迟滞模型

发布时间：2018-03-01 20:22

本文关键词： 微动平台压电执行器迟滞模型阈值优化　出处：《压电与声光》2016年03期 　论文类型：期刊论文

【摘要】：为减少PI迟滞模型的无效算子数,进而提高模型的运算速度,采用阈值优化法来改进PI迟滞模型。采用PI迟滞模型拟合被描述对象的实测曲线时,实测曲线在各阈值点处的斜率可用该点处迟滞算子的权重和来表达,该权重和越接近该点曲线的斜率,PI迟滞模型的精度就越高。这样便可在保证模型精度满足要求并使其在各阈值点处相同的情况下,对模型的阈值进行优化,进而减少模型的算子数。根据测得的最大实测升程曲线,基于阈值优化法,建立了压电微动平台的迟滞模型。实验结果表明,所建模型算子数仅为7个,且不含无效算子;在0~15.94μm的位移范围内,所建模型的误差变化范围为0.23~0.40μm,即1.4%~2.5%。所建模型可较好地描述压电微动平台的迟滞非线性。
[Abstract]:In order to reduce the number of invalid operators of Pi hysteresis model and improve the operation speed of the model, the threshold optimization method is used to improve the Pi hysteresis model. When Pi hysteresis model is used to fit the measured curves of the described object, The slope of the measured curve at each threshold point can be expressed by the weight sum of the hysteresis operator at that point. The higher the accuracy of the Pi hysteresis model is, the closer it is to the curve of the point, the higher the accuracy of the model is, so that the threshold value of the model can be optimized under the condition that the accuracy of the model is satisfied and the threshold value is the same at each threshold point. Based on the maximum measured lift curve and the threshold optimization method, the hysteresis model of piezoelectric fretting platform is established. The experimental results show that the number of operators in the model is only 7, and there are no invalid operators. Within the displacement range of 15.94 渭 m, the error range of the model is 0.23 ~ 0.40 渭 m, that is, 1.4 渭 m. The model can well describe the hysteresis nonlinearity of piezoelectric fretting platform.
【作者单位】：宁波大学机械工程与力学学院;
【基金】：国家自然科学基金资助项目(51175271) 教育部留学回国人员科研启动基金资助项目浙江省高等学校中青年学科带头人学术攀登基金资助项目(Pd2013091)
【分类号】：TH703

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