Desidn And Analysis Of Array Type Piezoelectric Vibration Energy Harvesters

With the development of micro-mechanical and electronic technology,low-power microelectronic devices have been widely used in military defense,aerospace,industrial automation and control,remote monitoring and other fields.However,it's difficult for the traditional chemical batteries to meet the requirements of such micro-electronic equipments in the volume,quality,life and other aspects.Energy harvesting technology that collects energy from the environment and converts it into electricity is becoming a hotspot at home and abroad.In the study of energy harvesting,the design of piezoelectric vibration energy harvester has been paid more and more attention.The traditional linear resonant piezoelectric energy harvester only has the high energy output when the vibration frequency of the external excitation source is close to its natural frequency,but the vibration energy existing in most environments is made up of many frequencies.Thus such a resonance-based piezoelectric energy haeveater becomes inefficient for real-world applications.Based on the motion form in the environment and the idea of parameter optimization design,the design and performance of the array-type vibration energy harvester were studied.Firstly,A linear array energy harvesting device under linear reciprocating motion was designed.A multi-step energy conversion method was proposed.By means of numerical calculation and experimental study,its energy acquisition efficiency was better than that of the non-array type energy harvester.A circular array energy harvesting device was designed,and the experimental results showed that it had high power generation efficiency.Finally,a magnetic coupling bistable rotational motion energy harvester was proposed.The the experimental results showed that it's suitable for medium and time-varying speed rotation.The main research work is as follows:A linear array energy harvesting device under linear reciprocating motion was designed.The multi-step energy conversion mechanism analysis was carried out to establish the theoretical model and analyze the output performance.The design of the vibration loading test platform was carried out.The performance of the energy harvesting device was studied experimentally.The output characteristics of output voltage,output power,operating frequency bandwidth of the energy harvester under different configurations were discussed and analyzed.A circular array energy harvesting device was designed.The theoretical model of the energy harvesting system was established by using the energy method.The dynamic equation and the electromechanical coupling equation were obtained.The performance of the energy acquisition device was studied experimentally.According to the experimental results,the resonant frequency,the optimal resistance,the output power,the operating frequency bandwidth and the output characteristics of the energy harvester under different configurations were discussed.A magnetic coupling bistable rotational motion energy harvester was proposed.Based on Hamilton 's principle,the electromechanical coupling dynamics model of the energy harvester was established by energy method.The influence of key parameters on the performance of energy harvester was discussed.The output characteristics of the energy harvester under rotational motion were studied theoretically and experimentally.The key points of the application of the magnetic coupling bistable rotational motion energy harvester were discussed.In this paper,the study of the vibration energy harvesters can provide a reference for the optimization of the output performance of the piezoelectric vibration energy harvesters.