Research On Electromagnetic Coupling Omnidirectional Vibration Energy Recovery Device Based On Elastic Rope Structure

Mobile electronic devices have entered all aspects of our lives and are used to monitor human health,medical care,environmental protection,and monitoring of building facilities.The rapid advancement of low-power technologies has laid the foundation for the development of wireless sensor nodes(WSN).If the wireless sensor node lacks an energy source,it will have no way to complete the scheduled monitoring task and lose its use value.At present,sensor nodes mainly use chemical batteries,but there are many disadvantages in using chemical batteries for power supply.First,even if the battery is not in working condition,it also has current leakage losses;secondly,bad weather may cause the battery to be destroyed and internal chemicals leak,causing many environmental problems;third,the battery’s energy is limited when the power consumption at the end of the day,the wireless sensor node will not be able to complete the task.Therefore,in order to enable the wireless sensor node to work uninterrupted,it is necessary to provide it with a continuous power supply.In this paper,according to Faraday’s law of electromagnetic induction,an electromagnetic coupling omnidirectional vibration energy recovery device based on elastic rope structure is designed,and the device is analyzed and studied from theory and experiment.The main work as follows:⑴ The application of vibration energy recovery technology in wireless sensor nodes is introduced.The development and research status of vibration energy recovery technology at home and abroad are expounded.⑵ Through the analysis of nonlinear energy recovery,an electromagnetic coupling omnidirectional vibration energy recovery structure based on elastic rope structure is designed.The dynamic characteristics and electromechanical conversion characteristics of the energy recovery structure are mainly introduced,and the derivation of the mathematical model is analyzed by numerical simulation.⑶ Designed an energy management circuit for electromagnetic coupling vibration energy recovery.Including the energy harvesting circuit,rectifying circuit,amplifying circuit and storage circuit for the structure of the device,and verifying each part.⑷ Conducted a performance test experiment on the electromagnetic coupling omnidirectional vibration energy recovery device based on the elastic rope structure to verify its energy recovery voltage and energy recovery power.The effects of different excitation frequencies,different excitation amplitudes,different excitation directions,and connection methods between coils on energy recovery performance are analyzed.