Design And Research On Electromagnetic-piezoelectric Energy Harvesting System For Shared Bicycles

The emergence of shared bicycles has provided an important solution to the difficulty of traveling the last mile.As an extension of public transportation,it penetrates into every corner of the city like nerve endings,greatly enriching and facilitating people’s daily life and work.As a product of the rapid development of the Internet of Things,shared bicycles have many applications of the Internet of Things,such as smart car locks,positioning chips,and Bluetooth modules.The self-powering of low-power components on shared bicycles not only reduces labor maintenance costs,but also greatly reduces resource waste and environmental pollution caused by frequent battery replacement.At present,the main energy supply solution is solar panels,but because solar panels are greatly affected by their own cleanliness,weather,and temperature.Therefore,this paper proposes an electromagnetic-piezoelectric hybrid energy harvesting system,which can convert and utilize the kinetic energy of the shared bicycle while riding,to provide battery life for the low-power components on the shared bicycle.Firstly,the development status of mechanical energy harvesting technology at home and abroad is studied.Combined with the structural characteristics of shared bicycles,this paper proposes an electromagnetic-piezoelectric hybrid energy harvesting system.The system structure is divided into three modules:the kinetic energy input module,which provides the rotational kinetic energy required for energy collection;the hybrid conversion power generation module,which converts mechanical energy into electrical energy.The hybrid energy collection method can effectively improve the energy collection efficiency;the rectifier storage module,integrates storage.The current is generated by the two power generation methods.Secondly,this paper conducts modeling and theoretical analysis of the proposed system and uses COMSOL Multiphysics 5.0 multi-physics simulation software to simulate the electromagnetic and piezoelectric power generation models of the hybrid power generation system respectively.The simulation results are used as a reference for the coupling distance and prototype size setting data of the hybrid energy harvesting device.Finally,make a prototype and build a test platform,set up a test control group for testing,and collect test data for analysis and processing.The results show that the optimal load of the piezoelectric generator is between 2kQ and 3kΩ,the output power is 4.55 mW,and the power density is 2.45W/m2.The optimal load of the electromagnetic generator is between 8Ω and 10Ω,the output power is 5.52 mW,and the power density is 45.3 W/m2.To further explore the feasibility of the hybrid energy harvesting system,charging tests and application tests were carried out,and energy consumption analysis was carried out for the low-power components on shared bicycles.The results show that the hybrid energy harvesting system designed in this paper can meet the self-powering of low-power components of shared bicycles.