【作者】 李鑫；

【导师】 邹鸿生；

【作者基本信息】 浙江大学 ， 工程力学， 2012， 硕士

【摘要】 压电俘能器是一种利用压电效应将振动能转换为电能的器件。振动现象大量存在于日常生产生活中,例如管道振动,机翼振动,人体运动等。本文基于管道系统模型,进行了圆柱壳压电俘能器的理论和实验研究,和传统的非曲率结构压电俘能器不同,圆柱壳压电俘能器是一种有曲率结构的压电俘能器。本文对圆柱壳压电能量采集及振动主动控制进行了以下几个方面的研究：首先,分析了压电圆柱壳开路模态能量的空间分布特性,以及压电片大小对模态能量幅值的影响。另外,还分析了圆柱壳厚度、圆柱壳半径和压电片厚度对模态能量幅值的影响。然后,建立了圆柱壳分布式压电俘能器模型,推导了圆柱壳在简谐激励情况下,压电片外部负载上的模态电流、模态电压、和模态功率表达式。再次,进行了圆柱壳模态识别实验,并实验验证了圆柱壳分布式压电俘能器模型。进行了压电能量采集电路设计与实验,推导了压电片输出电压经整理滤波电路后外接负载上的功率表达式,后端直流电可以驱动发光二极管LED灯发亮,最后对电容和电池进行充电,电池充电后可以驱动微马达振动。最后,进行了圆柱壳振动主动控制实验,运用正位置反馈控制器和共振控制器两种控制器进行控制,其中正位置反馈控制是正反馈控制,而共振控制是负反馈控制,实验分析了两种控制器的控制效果。更多还原

【Abstract】 The piezoelectric energy harvester is a device which can convert the vibration energy into the electric energy through the piezoelectric effect. Vibration phenomenon exists in the daily production and life, for example, pipe vibration, wing vibration, body movement, etc. Based on the model of the piping system, this study investigates the theory and experiment of the circular cylindrical shell piezoelectric energy harvester. Different from the traditional non-curvature structure piezoelectric energy harvester, the cylindrical shell piezoelectric energy harvester is a type of curvature structure piezoelectric energy harvester. This study explores the piezoelectric energy harvesting of a circular cylindrical shell and active vibration control, which contains following aspects.First, this study explores the spatial distribution of the open circuit modal energy of piezoelectric circular cylindrical shell, and also analysis the effect of piezoelectric patch size to the modal energy amplitude. Anymore, the effect of geometric parameters of cylindrical shell to the modal energy amplitude is also investigated.Second, a distributed parameter electromechanical model of cylindrical shell piezoelectric energy harvester is established, assuming the cylindrical shell is sinusoidal excited, the expression of the modal current, the modal voltage, and the modal power on the resistive load are derived.Third, the modal identification experiment is carried out. and the distributed parameter model of piezoelectric energy harvester is experimently validated. Furthermore, the energy harvesting circuit is designed. The power on the resistive load after rectifier and filter circuit is derived. The rectified and filtered direct current can drive the LED lights up. The capacitor charging experiment and the battery charging experiment are also carried out, and the charged battery can drive the micro motor work.Finally, the active vibration control experiment of cylindrical shell is investigated, the positive position feedback (i.e.. PPF) controller and resonant controller are designed, where the PPF controller is positive feedback controller, and the resonant controller is negative feedback controller. The control effect of the two controllers is analysised.更多还原