压电陶瓷驱动器三角波频率特性  

Frequency Characterization of Piezoelectric Ceramic Actuators Driven by Triangle-wave

作　　者：肖嘉[1] 赵建伟[1] 田莳[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《压电与声光》2003年第3期203-206,211,共5页Piezoelectrics & Acoustooptics

基　　金：航空基础科学基金资助项目(97G51061)

摘　　要：给出了三角波驱动信号下d31悬臂梁式驱动器的工作特性和频率特性。由于三角波包含了许多频率为基频奇数倍的谐波分量,当某一信号的谐波频率接近驱动器的共振频率时,该频率的三角波就会引起驱动器的谐振。因此,可以通过采用对扫描反馈电压的波形进行快速傅里叶分析法(FFT)来获得压电陶瓷驱动器的共振频率,而且,可以获得避开驱动器谐振点的驱动器设计原则,即:fr<0.6fk。此外,本试验压电陶瓷驱动器输出波形的延迟和非线性度与其驱动三角波频率的关系为:随频率增加,延迟不断增大;频率较低时,非线性度很大,而且随频率增大而增大,当频率在80～120Hz时,非线性度出现极大值,此后,非线性度随频率增大而减小。This paper describes the working and the frequency characterization of d31 bimorph cantilever actuators driven by triangle wave Because trianglewave contains many syntony waves whose frequencies are the integral multiples of the basic frequency, when one of a signal's syntonical wave approaches the resonant frequency of the actuator, this signal will result in syntony of the actuator Hence, the resonant frequency of actuator can be obtained through analyzing the feedback scanning voltage by the method of FFT (fast fourier transformation) Furthermore, a principle of designing actuators which can avoid syntony is:fr < 06fk The relationships between the frequency of triangle wave and the nonlinearity and delay of the piezoelectric actuator are: with an increase in frequency, the delay increases; when frequency is low, nonlinearity is very high and increases with frequency When frequency is between 80～120 Hz,the nonlinearity becomes its' maximum and then falls with the frequency increase.

关 键 词：驱动器 频率特性 压电陶瓷 三角波驱动信号 

分 类 号：TN721.2[电子电信—电路与系统]