Research On Nonlinear Energy Harvester Characteristics Of Bidirectional Vibration Energy Of Speed Bump

With the rapid development of China,the demand for all kinds of energy is increasing constantly,especially the demand for electric energy is everywhere.In order to minimize the damage to the environment,energy production is increasingly turning to non-traditional methods.In this paper,a new type of vibration energy harvester is designed and applied to the deceleration parking area of the speed bump,which provides a possibility for the roadside small power electric device to provide power.This paper proposes a bistable vibration energy harvesting device,the vehicle-speed bumps coupled system dynamics equation is established,and the model of speed bump,power generation system and buckling beam is analyzed and studied.Through two system states,energy harvester have been obtained respectively dynamics equation of the equivalent mass and the equivalent damping.In the 1/2 vehicle model,the Runge-Kutta method is used for simulation analysis and verification.Compared with the monostable system,the bistable system causes a large vibration of the speed bump and increases the power generation by 58%.The difference of the power generation performance of the two systems at different speeds is explored to further verify the excellent power generation performance of the bistable system,at the same time,the amplitude of vertical acceleration and pitching acceleration corresponding to the bistable system is reduced by 20%and 8%,respectively,the vehicle has better stability.The influence of vehicle speed and vehicle weight on vehicle stability is studied.It is found that when the vehicle speed increases,the vehicle body vibration is high frequency,and the vertical acceleration and pitch angle acceleration are larger,and the vehicle stability is worse.When the vehicle type is larger that is,the body mass and moment of inertia are larger,the vertical acceleration and pitching acceleration of the body will be smaller,and the vehicle will be more stable.The influence of vehicle speed and vehicle weight on vehicle stability is studied.It is found that when the vehicle speed increases,the vehicle body vibration is high frequency,and the vertical acceleration and pitch angle acceleration are larger,and the vehicle stability is worse.When the vehicle type is larger,the vertical acceleration and pitching acceleration of the body will be smaller,and the vehicle will be more stable.The influence of structural parameters on the power generation characteristics of the device is investigated.From the two aspects of nonlinear restoring force and potential well depth,it is concluded that the power generation of the system shows an upward trend of decreasing growth rate with the increase of the length of the buckling beam,and a continuous downward trend with the increase of the width and height of the buckling beam,the optimal buckling beam L=0.5m、b=0.01m,h=0.001m is selected.The power generation performance of the system is analyzed by selecting four types of vehicle and five types of speed bump.The larger the vehicle is,the better the power generation performance of the system is.Under the action of small non-linear restoring force,the increase of the height and width of the speed bump increases the excitation and amplitude of the speed bump,and improves the energy harvesting.Under the action of larger non-linear restoring force,the higher the speed bump is,the greater the system generation will be,while the wider the speed bump is,the smaller the system generation will be.At the same time,the influence of height on the power generation is far greater than that of width.Explore external resistance and growth ratio on the power performance,it is found that by increasing the external electric resistance,the system generation can increase at first and then decrease,the optimum load resistance R0=1Ω;Increasing the growth rate will lead to a state of continuous growth of the system’s power generation with a decreasing increase rate,so the growth rate ratio of n=50 is adopted in this paper.Finally,by comparing the power generation performance of the two flywheels,it is found that the big flywheel with the moment of inertia If=3.2g·m2 has better power generation performance.Through the above research work,the system dynamics model of the new speed bump vibration energy harvester is obtained,the influence law of the vehicle body stability and the system power generation characteristics is studied,which provides a theoretical basis for the design of the vibration energy harvester and is conducive to the sustainable development of energy.