Rate-dependent hysteresis modeling and compensation of piezo-driven flexure-based mechanism

Updating parameters according to the driving rate of input,the rate-dependent Prandtl-Ishlinskii(PI)model is widely used in hysteresis modeling and compensation.In order to improve the modeling accurac...     

非线性介电晶体的两种典型正逆效应

本文通过必要的数学表述及热力学函数定性讨论了介电晶体的压电效应与电致伸缩效应和热电效应与电热效应。     

基于公共电话网的家用智能心率监控系统设计

文章设计了基于公共电话网的家用智能心率监控系统,该系统由采集心率的下位机和基于公共电话网远程报警的上位机组成,两者之间采用无线通讯。下位机心率采集部分利用压电陶瓷传感器,将采集到的信号经过后级放大滤波整形得到稳定的方波信号,应用单片机技术将脉搏信号转换成心率值通过1602液晶显示,并对异常信号通过PT2262/2272无线通讯模块发送给上位机,上位机通过公用电话网进行报警,可以实现实时监测,远程通讯和呼救等多种功能。     

基于压电陶瓷应力波的套筒灌浆缺陷检测

采用基于压电陶瓷应力波的方法对套筒灌浆的密实性进行缺陷检测。通过有限元方法模拟灌浆套筒构件在健康与不同缺陷工况下的响应信号,在此基础上采用小波包变换定义了缺陷检测指标小波包能量。数值算例研究结果表明:小波包能量指标能够有效地识别灌浆套筒内部灌浆料的密实性,并且随着灌浆缺陷的增大指标值逐渐增大。     

对压电式传感器实验内容的改进

根据教学和实验的要求,对压电式传感器的实验内容进行了改进,使学生能通过实验更好地掌握压电式传感器的结构、原理、使用注意事项,学会使用该传感器测试振动的方法。     

Test on Sensor Effect of Cement Matrix Piezoelectric Composite

A novel cement matrix smart piezoelectric composite and its application as sensing element are presented. A cement matrix smart piezoelectric composite piece encapsulated in a cement mortar formed a practical sensor, and it was tested on material test system with cyclic loading. According to the theoretical analysis, the function of the cement matrix piezoelectric sensor output voltage was expressed in terms of the magnitude of the input cyclic loading amplitude and frequency. The curve fitting of gain function that is defined as sensor‘s gain factor under different frequencies of input loading was carried out. From the results of curve fitting, it is found that the cement matrix smart piezoelectric composite has a simple relationship between input loading and output voltage. Therefore the cement matrix piezoelectric composite sensor is suitable to be applied in structural health monitoring.     

General solutions for special orthotropic piezoelectric media

INTRODUCTION General solution is a convenient, effective method for solving space problems such as problems of infinite, semi-infinite and two-phase infinite media. For linear theory of piezoelasticity, Ding et al.(1996; 1997a) gave the general solution for coupled equa-tions for transversely piezoelectric media using po-tential theory. Ding et al.(1997b; 1997c) gave the general solution of plane problem. Based on the gen-eral solution, Ding et al.(1997a) presented the closed form fundam…     

Hg_2cl_2声光器件中换能器的电输入阻抗特性

本文讨论了Ｈｇ２ｃｌ２声光器件中换能器的输入阻抗计算，讨论了归一化输入阻抗在Ｓｍｉｔｈ园图上的表示及其应用     

A penny-shaped crack in an infinite piezoelectric body under antisymmetric point loads

In this study, Fabrikant (1989, 1991)'s new results in potential theory were used to obtain the exact and complete solution for the problem of a penny-shaped crack in an infinite transversely isotropic piezoelectric body subjected to antisymmetric point loads (point charges and normal point forces); then the complete solution for the problem of one-sided loading of a penny-shaped crack was obtained by the superposition of the symmetric loading solution in Chen and Shioya (1999) and the antisymmetric one presented here; and then the reciprocity theorem of piezoelectric media was used to deal with the problem of interaction between arbitrarily located point forces and a point charge with a penny-shaped crack and obtained the exact expressions of the crack faces' normal displacement in terms of elementary functions and some non-singular integrals; and finally obtained the normal displacement of the positive and negative faces of the crack under many loading cases as shown in figures for an infinite PZT-4 piezoelectric ceramic body weakened by a penny-shaped crack. Project (19872060) supported by the Natural Science Foundation of China.     

压电陶瓷材料参数对有限元结果的影响研究

根据压电陶瓷材料的压电效应,改变压电常数,基于阻抗分析法运用有限元分析,结合阻抗实验对比有限元结果,分析了该方法研究的可行性,讨论了各个压电常数对阻抗的影响规律,调整参数并确定了最利于有限元实验的材料参数,总结了有限元分析的研究意义.