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在具有高阶形式的广义压电方程基础上,讨论掺镧改性锆锡钛酸铅PbLa(Zr,Sn,Ti)O_3(PLZST)反铁电相变陶瓷的非线性机电耦合问题,得到类似传统线性压电方程的近似线性电致伸缩方程,给出了一种解决非线性反铁电相变陶瓷换能器电声转换问题的分析方法,即在直流偏置状态下对PLZST反铁电相变陶瓷的材料参数进行近似线性等效化处理进而分析换能器的电声转换问题。在此基础上,研制了水中谐振频率1.1 kHz新型反铁电相变陶瓷低频弯张换能器。湖上试验结果表明,与同结构同尺寸压电陶瓷弯张换能器相比,目前反铁电换能器样品的发射电压响应约高3 dB,声源级高出9 dB,并验证了本文所提出的分析非线性反铁电相变陶瓷换能器方法的正确性。
On the basis of generalized piezoelectric equations with higher order form, the nonlinear electromechanical coupling problem of lanthanum-modified PbZa (Zr, Sn, Ti) O_3 (PLZST) antiferroelectric phase transition ceramics is discussed. The approximate linear electrostrictive equation of the traditional linear piezoelectric equation is given and an analytical method is given to solve the problem of electroacoustic conversion of the nonlinear anti-ferroelectric ceramic transducer. In the DC bias state, the PLZST antiferroelectric The material parameters of the phase change ceramic are approximated by a linear equivalent process to analyze the electroacoustic conversion problem of the transducer. On this basis, a new type of low frequency bending transducer of antiferroelectric phase change ceramics with underwater resonant frequency of 1.1 kHz was developed. Experimental results on the lake show that compared with the same structure of the same size piezoelectric ceramic bending transducer, the emission voltage response of the current antiferroelectric transducer sample is about 3 dB higher and the sound source level is 9 dB higher, The proposed method for analyzing non-linear antiferroelectric phase change ceramic transducers is correct.