激励环境下rainbow型压电换能器发电性能分析

Output voltages of a rainbow type piezoelectric transducer under incentive environment

为提高有限体积rainbow型压电换能器的能量收集能力,针对外力和外界位移两种激励环境,通过数值模拟分析了换能器输出电压与结构参数及材料特性的影响关系。结果表明,在外力激励环境中,随着宽度及初始曲率半径的增加,换能器的输出电压单调减小;随着长度和弹性模量比的增加,换能器的输出电压不断升高;随着厚度比的增加,换能器的输出电压将呈现-最大值。在外界位移激励环境中,随着厚度比、长度和弹性模量比的增加,换能器的输出电压不断降低;随着初始曲率半径的增加,换能器的输出电压不断升高;而宽度对换能器输出电压的影响可基本忽略。另外,不论在何种激励环境中,换能器内侧压电薄膜的输出电压都要大于外侧压电薄膜的输出电压。

For improving output voltages of a rainbow type piezoelectric transducer with a definite volume,under external forces and displacements,two kinds of incentive environment,the relations among output voltages,structural parameters and material properties of a rainbow type piezoelectric transducer were analyzed with numerical simulation.The results showed that under external forces of incentive environment,the output voltages of the rainbow transducer decrease with increase in its width and initial curvature radius,the output voltages of the transducer increase with increase in its length and elastic modulus ratio,the output voltages of the transducer reach the maximum value with increase in its thickness ratio;under external displacements of incentive environment,the output voltages of the transducer decrease with increase in its thickness ratio,length and elastic modulus ratio,the output voltages of the transducer increase with increase in its initial curvature radius;moreover,the output voltages of the inside piezoelectric film of the transducer are larger than those of the outside piezoelectric film of the transducer.