The Influence Of The Potential Well Depth On The Performance Of Electromagnetic Vibration Energy Harvesting Device

It is not only a measure of energy saving and environmental protection, but also a development and application of the new type of energy, which can collect the vibration energy in the environment.Vibration power generation refers to the transformation of mechanical energy into electrical energy.At present, scholars at home and abroad have done a lot of research on nonlinear vibration energy harvesting devices.Electromagnetic structure is one of the common forms of power generation.Compared with the monostable system, the bistable system can complete the large amplitude, wide frequency period and even chaotic motion under the condition of non resonance excitation,output voltage increased significantly.Therefore, the bistable vibration energy capture device has become the focus of current research.In this paper, the method of numerical simulation and analytical analysis is presented,which is based on the study of the bistable electromagnetic energy harvesting device with an additional linear oscillator.The main research work in the thesis are as follow:The mechanical model of the bistable electromagnetic vibration energy capture system is established. The influence of the depth of the potential well on the system performance is studied by the numerical simulation. .The relationship between the ratio of stiffness coefficient and the depth of potential well is analyzed .Then the optimal stiffness coefficient ratio can be obtained.On this basis, the influence of mass ratio, frequency modulation ratio and damping ratio on the performance of the system is further studied.The influence of the depth of the potential well on the performance of the bistable electromagnetic vibration energy harvesting device with additional linear oscillator is studied by using the numerical simulation method under the Gauss white noise. Firstly, the influence of the stiffness coefficient ratio on the power generation performance of the system is analyzed under different noise intensity. Based on the corresponding optimal stiffness coefficient ratio ,influence of the mass ratio and frequency ratio of bistable system of power performance is studied , obtained the optimal mass ratio and frequency ratio.A study on the performance of a bistable electromagnetic vibration energy harvesting system with an additional linear oscillator by IHB method. First drawed the amplitude frequency response curve and the output power curve of the bistable system with the different well depth .It is shown that the smaller the stiffness coefficient ratio with the larger the response amplitude and output power.But the larger the stiffness factor ratio is, the wider the response frequency band is. At the same time, compared with the linear system, it can be seen that the bistable system can broaden the response frequency band of the system, and the system has better power generation performance.Based on the above work, the dynamic characteristics of the bistable electromagnetic generator with additional linear oscillator are obtained.This paper provides a theoretical basis for the study of the system.