【摘要】 基于ANSYS研究因温度变化对埋入混凝土中压电陶瓷的电声换能特性的影响。在压电陶瓷振动模态的基础上,进一步通过热—结构—压电的顺序耦合分析方法讨论了在不同温度下压电陶瓷谐振频率和中心声压的变化。仿真结果表明压电陶瓷的谐振频率随温度变化表现出非线性的温度特性,在20℃左右和居里温度附近出现频率漂移变化的两个拐点。在温度对压电陶瓷的辐射声波场的影响仿真中,中心点的声压值随温度变化也呈现非线性的特点,在20℃附近出现曲线的拐点。压电陶瓷声能的非线性特性与运用铁电体压电陶瓷晶体结构理论得到的分析一致。更多还原

【Abstract】 A research based on vibration mode piezoelectric ceramics on the basis of further by heat-structure-piezoelectric coupling analysis method discussed changes at different temperatures in the resonance frequency of the piezoelectric ceramics. The simulation results show that the resonant frequency of the piezoelectric ceramics exhibits nonlinear temperature characteristics with temperature change,the temperature around 20 ℃ and the Curie temperature are the two inflection points of the frequency drift. The influence of temperature on the acoustic field of the piezoelectric ceramic is simulated. The central point of the sound pressure value is also nonlinear with the temperature,and it is the turning point of the curve near 20 ℃. The non-linear characteristics of acoustic energy of piezoelectric ceramics are consistent with those obtained by the theory of crystal structure of ferroelectric piezoelectric ceramics.更多还原