涡激振动型水力复摆式压电俘能器的仿真与实验研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (19) : 78-83.

论文

宋汝君¹，单小彪²，范梦龙²，谢涛²

作者信息 +

Simulation and Experimental Study of a Hydrodynamic Compound Pendulum Piezoelectric Energy Harvester with Vortex-induced Vibration

SONG Rujun¹, SHAN Xiaobiao², FAN Menglong², XIE Tao²

Author information +

文章历史 +

摘要

针对低速水流的能量收集问题，提出了一种复摆式涡激振动压电俘能器。该俘能器由压电悬臂梁与尾端圆柱平行连接组成，具有免予封装绝缘，振动响应大，易于在低速水流中产生涡激共振等优点。通过流-固-电耦合仿真分析和实验测试的方法，研究了水流流速对复摆式压电俘能器振动和俘能的影响规律。结果发现：俘能器的输出功率随负载电阻先增大后减小，存在最优电阻可使俘能器的输出功率最大。俘能器的振动幅值和功率输出均随流速的增大而先增大后减小，在涡激共振处出现最大值；振动频率整体随着流速的增大而增大，但在涡激共振区域，由于“锁定”，俘能器的振动频率基本保持在俘能器的固有频率处。俘能器输出功率随圆柱直径的增大而增大，但涡激振动速度也相应的提高。

Abstract

A compound pendulum piezoelectric energy harvester (CPPEH) with vortex-induced vibration (VIV) is proposed to convert the water flow energy to electricity. The harvester is composed of a piezoelectric cantilever beam and a parallel cylinder, which has the advantages of exempting from encapsulation insulation, greater vibration response and easy to generate vortex-induced resonance at low-speed water flow. The effects of water velocity on hydrodynamic response and energy harvesting performance of the CPPEH are investigated by simulation method of coupled fluid-structure-electric and experiment test. It is found that output power first increases as the load resistance increases and maximum power output is obtained when reaching the optimal resistance, and then output power decreases. Vibration amplitude and output power versus velocity have the same change regulation and maximum power output is obtained at vortex-induced resonance. The vibration frequency is overall increasing with the increase of velocity. However, because of “lock-in” of the vortex-induced vibration, vibration frequencies are mainly equal to the nature frequency of the CPPEH during the region of vortex-induced resonance. Output power of the harvester is enhanced with the increase of cylinder diameter, while the velocity of vortex-induced resonance is increased at the same time.

导出引用

宋汝君1，单小彪2，范梦龙2，谢涛2. 涡激振动型水力复摆式压电俘能器的仿真与实验研究[J]. 振动与冲击, 2017, 36(19): 78-83

SONG Rujun1, SHAN Xiaobiao2, FAN Menglong2, XIE Tao2. Simulation and Experimental Study of a Hydrodynamic Compound Pendulum Piezoelectric Energy Harvester with Vortex-induced Vibration[J]. Journal of Vibration and Shock, 2017, 36(19): 78-83

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