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首页> 外文会议>ASME International Design Engineering Technical Conferences >MODELING AND EXPERIMENTAL VALIDATIONS OF A PIEZOELECTRIC ENERGY HARVESTER UNDER COMBINED GALLOPING AND BASE EXCITATIONS
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MODELING AND EXPERIMENTAL VALIDATIONS OF A PIEZOELECTRIC ENERGY HARVESTER UNDER COMBINED GALLOPING AND BASE EXCITATIONS

机译：良良良良兴奋和基础激励下压电能源收割机的建模与实验验证

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摘要

This paper develops an experimentally validated model of a piezoelectric energy harvester under combined aeroelastic-galloping and base excitations. To that end, an energy harvester consisting of a thin piezoelectric cantilever beam subjected to vibratory base excitation is considered. To permit galloping excitation, a bluff body is rigidly attached at the free end such that a net aerodynamic lift is generated as the incoming airflow separates on both sides of the body giving rise to limit cycle oscillations when the flow velocity exceeds a critical value. A nonlinear electromechanical distributed-parameter model of the harvester under the combined excitation is derived using the energy approach and by adopting the nonlinear Euler-Bernoulli beam theory, linear constitutive relations for the piezoelectric transduction, and the quasi-steady assumption for the aerodynamic loading. The partial differential equations of the system are discretized and a reduced-order-model is obtained. The mathematical model is validated by conducting a series of experiments with different loading conditions represented by wind speed, base excitation amplitude, and excitation frequency around the primary resonance.
机译：本文在空气弹性良好和基础激发中开发了一种实验验证的压电能收割机模型。为此，考虑了由经过振动基础激发的薄压电悬臂梁组成的能量收割机。为了允许良好的激励，凹槽主体在自由端刚性地附接，使得产生净空气动力升力作为进入的气流在体内的两侧分离时，当流速超过临界值时产生限制循环振荡。利用能量方法和通过采用非线性欧拉 - 伯努利光束理论，对压电转导的线性本构关系来得出收割机的非线性机电分布式参数型号，以及用于压电转导的线性本构关系，以及空气动力学载荷的准稳态假设。可以离散化系统的部分微分方程，获得减少阶模型。通过在初级谐振周围进行有风速，基本激励幅度和激发频率表示的不同装载条件，通过进行一系列实验来验证数学模型。

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