非線性低頻壓電振動(dòng)能量回收裝置的研究
[Abstract]:In the process of miniaturization and practicality of wireless sensing technology, energy recovery technology has a broad application prospect. Among them, piezoelectric vibration energy recovery technology has the characteristics of high energy density, simple structure and easy system integration. It is very suitable for application in MEMS and has the most development prospect. In order to improve the shortcomings of the traditional linear piezoelectric cantilever energy recovery structure, a new nonlinear low frequency piezoelectric vibration energy recovery structure is proposed in this paper from the aspects of widening the frequency band of energy recovery, improving the efficiency of electromechanical conversion and increasing the energy output power. The main work of this paper is as follows: (1) the background of energy recovery, the types of piezoelectric materials, the research status of piezoelectric energy recovery at home and abroad from material and structure, interface circuit and storage application technology are introduced. (2) the basic knowledge of piezoelectric energy recovery is introduced, including the positive and inverse piezoelectric effect of piezoelectric materials, piezoelectric equation, piezoelectric constant, cantilever vibration energy recovery structure and its theoretical analysis. The piezoelectric vibration energy recovery structure with nonlinear force of magnet is proposed. (3) the magnetic force model between two permanent magnets is established and the expression of magnetic force is derived. by using this formula combined with Newton's law of motion, the dynamic equation of the structure is obtained and the electromechanical coupling model is established, and the simulation is carried out in Matlab/Simulink. (4) the energy recovery structure is processed and the experimental platform is built. The nonlinear piezoelectric vibration energy recovery structure is studied experimentally. (5) the self-power supply management system based on LTC3588-1 chip is designed, and its simulation and experimental test are carried out. The results show that the nonlinear piezoelectric vibration energy recovery structure proposed in this paper has the advantages of adjustable natural frequency and higher frequency. At the same time, the power management system based on LTC3588-1 chip can output a stable voltage.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TM619
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