Research And Experiment On Mechanical Rectification Type Energy Harvester For Opening And Closing Door Motions

The progress of science and technology has led to an increasing demand for energy.However,traditional fossil energy sources are facing problems of environmental pollution,difficulties in extraction and limited reserves.This is contrary to the development strategy of "carbon neutrality and emission peak" proposed by China to cope with global climate change.In this context,harvesting mechanical energy in the environment provides a new idea to solve the above problems.In this paper,we propose a mechanical rectifier type energy harvester aimed at the motion of opening and closing doors in building environments,such as a school building,due to the mechanical energy generated by the human motion.The purpose is to harvest the bidirectional swing energy of the opening and closing doors and convert it into electrical energy to power the electronic devices on the doors.Firstly,this paper analyzes the principle of center-tapped full-wave rectifier circuit,and also analyzes the operating principle of one-way bearing.The mechanical rectifier principle,which is the core working principle of the mechanical rectifier type energy harvester aimed at the motion of opening and closing doors,is explained and analyzed.A new mechanical rectifier method applying a parallel crank-slider mechanism is proposed.Based on the above principle analysis,the design of the mechanical rectifier type energy harvester aimed at the motion of opening and closing doors is performed.According to the working principle and technical requirements of the energy harvester,the overall design scheme is determined.On this basis,the detailed structural design of mechanical rectifier mechanism,transmission mechanism,speed increasing device,power generation and storage module and supporting structure is given.And the establishment of the 3D model of the energy harvester is completed.It meets the technical requirements of small size,light mass,compact structure and easy manufacturing and installation.Finally,the parts of the energy harvester were manufactured,assembled and tested,and the experimental prototype of the energy harvester was completed,which established the foundation for the following experiments.Next,the power generation performance of the mechanical rectifier type energy harvester aimed at the motion of opening and closing doors was analyzed.The kinematic model of the energy harvester was established,and the kinematic equations of the energy harvester were derived to investigate the relationship between the open-circuit voltage and the kinematic parameters of the energy harvester.The dynamic model of the energy harvester was established,and the dynamic equations of the energy harvester were derived to investigate the dynamic parameters affecting the power generation performance of the energy harvester.The power generation of the energy harvester is analyzed,followed by the investigation of the factors affecting the energy harvest efficiency of the energy harvester.Finally,in order to verify the rationality of the structural design of the mechanical rectifier type energy harvester aimed at the motion of opening and closing doors and its energy harvest effect,a test experiment platform is built for it and the energy harvest simulation of the energy harvester is performed.Then,experiments on mechanical rectification effect of the energy harvester were conducted to verify the mechanical rectification effect of it.Experiments on the input parameters of the simulation scene were conducted to investigate the effects of the opening/closing door speed and the opening/closing door angle on the power generation performance of the energy harvester,respectively.Experiments on the load characteristics and energy harvest efficiency of the energy harvester are conducted to verify the factors affecting the energy harvest efficiency.Finally,experiments on the application of the energy harvester are conducted to verify the possibility and practicality of its practical application.The experimental results show that the maximum open-circuit voltage of the energy harvester developed in this paper is 7.06 V at a frequency of 0.5 Hz for the opening and closing of the door.The maximum output power is 4.15 W,and the maximum energy harvest efficiency is 69.65%.And the harvested energy can power the electronic door lock for more than 150 s.It can meet the power supply requirements of most electronic devices on doors in human life.