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金属-压电陶瓷双迭片弯曲型压电传感器谐振频率半解析求解方法
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摘要
本文从金属-压电陶瓷双迭片压电振子的力学特性出发,在忽略辐射阻尼和损耗的条件下,将边缘固定的金属-压电陶瓷双迭片压电振子视为边缘固定的、中间部分为金属-压电陶瓷双迭片的薄圆板,导出在满足薄板小挠度变形和轴对称的条件下压电振子弯曲位移的一般解。由薄板小挠度变形和轴对称的条件下压电振子弯曲位移的一般解求得金属-压电陶瓷双迭片弯曲型压电传感器的谐振频率。借助于Matlab强大的符号计算功能,将此法应用于金属-压电陶瓷双迭片弯曲型压电传感器的谐振频率的求解并计算结果与Ansys模拟运算结果进行对照,可以认为求解的结果与有限元模拟所得的结果比较接近。
According to the mechanic characteristic of the piezoelectricity oscillator, the metal-piezoceramics bimorph flexural piezoelectric ceramic transducer clamped along boundary is considered as a circular thin plate with a fixed boundary and a metal-piezoceramic bimorph in the central section. Then a general solution of displace of piezoelectricity oscillator with the assumption the small deflection and the axial symmetry conditions are satisfied is presented. According to the general solution, the resonant frequencies of metal-piezoceramics bimorph flexural piezoelectric ceramic transducer are approached. The method has been applied to the calculation of the resonant frequency of the bending piezoelectric sensor with metal piezoelectric ceramics bimorph and the results are compared with the results of Ansys simulation. It can be considered that the results obtained from the solution are close to the results of finite element simulation.
引文
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