Research On Nonlinear Oscillations Self-driven Rotation Energy Harvesting Mechanism And Experiment

With the development of smart tires,in order to realize the multi-information fusion of smart tire monitoring,various sensors are urgently needed to detect tire information.However,how to stably supply power to the sensors and establish a green and low-carbon vehicle-mounted sensor integration system has become an urgent problem to be solved.Due to the high-speed rotation of automobile tires,it is difficult to stably supply power to tire sensors,and relying on batteries with a short replacement cycle will increase the power maintenance cost of tire sensing equipment,and will further cause environmental pollution.Therefore,in order to solve the problem of difficulty in power supply for high-speed rotating tires,efficiently harvest the vibration energy dissipated in the rotating environment of the vehicle,and then realize the self-powering technology of sensing equipment,nonlinear oscillations self-driven rotation energy harvesting mechanism and experiment are studied.Firstly,the classification and structure of energy harvesters are introduced.Piezoelectric nonlinear energy harvesters are used in this paper.Traditional linear energy harvesters are not suitable for applications with large speed changes,due to their narrow effective energy harvesting frequency bands.The nonlinear energy harvesting device has the advantages of high working efficiency and wide effective energy harvesting frequency band,and is one of the best solutions for power supply of tire pressure monitoring system.Secondly,the resonance phenomena of nonlinear energy harvester including stochastic resonance and monostable and bistable resonance are analyzed.The structure of the rotating bistable energy harvester is determined,and the nonlinear system is constructed by generating nonlinear magnetic force through the magnet.The dynamic and electrical equations of the rotating bistable energy harvester are established.Through the analysis of the dynamic equation,it is concluded that the centrifugal force makes the stochastic resonance frequency and the frequency of the jump-down point under high-energy orbits tunable.And the centrifugal distance optimization method of cantilever beam free end magnet based on high-energy orbit at high speed,and the verification of the centrifugal distance optimization method is completed by Matlab/Simulink.Finally,in order to verify the centrifugal distance optimization method proposed in this paper,the experimental bench for energy harvesting of rotational vibration was built.In the vibration environment,the centrifugal distance optimization experiment based on stochastic resonance was carried out,and in the non-vibration environment,the centrifugal distance optimization experiment based on the high-energy orbit was carried out.The effectiveness of the proposed centrifugal distance optimization method is verified by bench experiments.