耗散因子的压电等效电路参数确定法

耗散因子反映了材料中的能量损失情况.根据耗散因子的定义,压电材料中的三种耗散因子--介电、弹性和压电损耗因子分别由复数形式的介电常数、弹性常数和压电常数计算得到.但复常数的测量过程复杂,并要求对同种压电材料的不同振动模的测量值进行迭代运算.针对研究中设计的一种压电埋入式混凝土敏感模块,提出一种通过等效电路参数计算耗散因子的方法.等效电路参数测量简单,耗散因子能够在测量同时完成,免去了复杂的迭代过程,同时,可以通过更换相应的特性参数,将该方法应用于不同的压电振动模情况.通过测量压电陶瓷在应力和温度作用下的等效电路参数,计算并分析了埋人状态下压电材料耗散因子的应力及温度特性.

Dissipation Factors Represented by Piezoelectric Equivalent Circuit Parameters

Dissipation factors reflect the energy losses of materials.Based on the definition of dissipation factors,the dielectric,elastic and piezoelectric dissipation factors can be expressed by the complex materials coefficients.However,the measurement of complex materials coefficients is always difficult and complicated.A method of obtaining dissipation factor s by measuring equivalent circuit parameters is proposed.In the temperature and stress experiments,by measuring the equivalent circuit parameters during th...