| With the rapid development of the Internet of Things,more and more wireless sensor networks and low-power electronic devices have been widely used.At present,the main power source of these devices is still traditional chemical batteries.These batteries have low energy density,short lifespan,and environment pollution.Moreover,replacing batteries for hundreds of millions of sensors requires a lot of manpower and material resources.Therefore,obtaining energy from environmental energy such as the sun,heat,wind,vibration,etc.as an alternative energy source for these devices has attracted considerable research interest.Among these energy sources,the vibration energy in the environment is widely regarded as one of the most concerned and researched energy sources because of its existence and not restricted by the environment.In this paper,based on the previous work of the research group,the structure of the electromagnetic vibration energy harvester is adjusted,and the influence of each component in the energy harvester on the performance of the harvester is studied.First,the basic theory of electromagnetic power generation is introduced,and a collector based on a cross-shaped plane spring is proposed.The characteristics of the collector are simulated and analyzed,and the experiment is compared with the simulation.The changes caused by changing the key parameters of the plane spring are analyzed in detail,and the relevant conclusions are verified through theoretical derivation and simulation.On the basis of the previous research,through the combination of springs with different elastic coefficients,a wide-range vibration energy harvesting device based on biplane springs is proposed.The basic principles of its structure are discussed in detail,and the vibration energy harvester formed by different spring combinations is analyzed through simulation.Finally,the vibration energy harvester was tested experimentally,and the output characteristics of the energy harvester were studied.First,an experimental prototype was made and an experimental platform was built.A computer controlled vibration table was used to stimulate the energy harvester under different conditions.The output signal was collected with an oscilloscope,and then the data was processed and analyzed.In the course of the experiment,the output voltage and output power of collectors based on different spring structures were tested with different excitation acceleration.The output voltage and output power varies with the frequency curve.Different collectors have the same natural frequency excitation.The output voltage and output power vary with the load.The curve of change.The experimental results are compared with the simulation analysis to verify the correctness of the model results. |
