• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (9): 89-98.doi: 10.3901/JME.2021.09.089

• 机械动力学 • 上一篇    下一篇

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压电式摩擦振动能量收集的试验研究与仿真分析

王东伟1, 刘明星1, 吴霄1, 钱韦吉2   

  1. 1. 中国核动力研究设计院核反应堆系统设计技术重点实验室 成都 610213;
    2. 西南石油大学机电工程学院 成都 610500
  • 收稿日期:2020-05-21 修回日期:2021-01-18 出版日期:2021-05-05 发布日期:2021-06-15
  • 通讯作者: 王东伟(通信作者),男,1988年出生,博士,工程师。主要研究方向为摩擦振动,能量收集,机械系统动力学。E-mail:dongwei1013@sina.cn
  • 基金资助:
    国家自然科学基金资助项目(51505396)。

Experimental and Numerical Study on the Response Characteristics of Piezoelectric Energy Harvester via Friction-induced Vibration

WANG Dongwei1, LIU Mingxing1, WU Xiao1, QIAN Weiji2   

  1. 1. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213;
    2. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500
  • Received:2020-05-21 Revised:2021-01-18 Online:2021-05-05 Published:2021-06-15

摘要: 针对机械系统中普遍存在的摩擦振动现象,结合试验分析和数值模拟的方法,提出采用压电材料进行摩擦振动能量收集的新思路。本研究搭建了一种既能产生摩擦振动,同时又能利用压电材料将振动能量转化为电能的试验装置,摩擦学试验结果验证了利用压电材料实现摩擦振动能量收集的可行性。利用有限元软件ABAQUS对试验过程进行模拟,首先采用复特征值分析法对压电式能量收集器的响应特性进行分析,结果表明摩擦系统在法向和切向上出现的不稳定振动模态是实现摩擦振动能量收集的重要因素。采用瞬时动态分析法对摩擦系统的动力学响应进行模拟,结果表明瞬态分析能够从时域上很好地模拟试验过程,较大的法向载荷导致系统产生较强的摩擦振动,从而导致压电材料变形位移增大,进而输出较高的电压;摩擦系统存在一定的临界速度,使得系统能够产生最强的摩擦振动能量,并对外输出最大电压信号;进一步地,本研究建立起摩擦与压电相互耦合的二自由度数学模型,验证了摩擦振动能量收集的可行性,并定性分析了法向载荷和运动速度对系统响应的影响。以上研究结果能为实现摩擦振动的能量收集提供理论依据。

关键词: 摩擦振动, 能量收集, 压电, 试验研究, 有限元分析

Abstract: In view of the common phenomenon of friction-induced vibration in instruments, the feasibility of using piezoelectric method to collect friction-induced vibration energy is discussed by using experimental analysis and numerical simulation. In this work, an experimental device which can generate friction-induced vibration and simultaneously convert vibration energy into electrical energy by using piezoelectric materials is established. The experimental results verify the feasibility of using piezoelectric materials to collect friction-induced vibration energy. The experimental process is simulated in the finite element software ABAQUS. Firstly, the response characteristics of the piezoelectric energy collector are analyzed by using the complex eigenvalue analysis method. The results show that the unstable vibration mode in the normal direction and tangential direction of the friction system plays an important role in realizing the collection of friction-induced vibration energy. In addition, transient dynamic analysis is performed to detect the dynamic response of the friction system, the results show transient analysis can well simulate the test process in time domain. The larger normal load will cause the friction system to generate stronger vibration, resulting in the deformation displacement of piezoelectric materials increases, and accordingly output higher voltage. The friction system has a certain critical speed, which enables the system to produce the strongest friction vibration energy and output the maximum voltage signal. Furthermore, a two-degree-of-freedom mathematical model which couples the friction and piezoelectric is established, results verify the feasibility of the energy harvesting via friction-induced vibration, and qualitatively analyzes the influence of normal load and velocity on the system response. The above results can provide theoretical basis for energy collection of friction vibration.

Key words: friction-induced vibration, energy harvesting, piezoelectric, experimental study, finite element analysis

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