| With the aggravation of environmental pollution,the development of new energy has become a realistic demand for the promotion of ecological civilization in China;on the other hand,with the widespread use of the speed bump,the large amount of vibration energy generated by the car through the speed bump is not rationally utilized.The speed bump vibration energy harvester(SBVEH)can collect and convert this part of the vibration energy into electric energy,which can replace the traditional power supply method to provide sustainable power for small-sized electric equipment,which can bring good social and economic benefits.At present,the SBVEH uses a linear system for energy harvest,and the working bandwidth is narrow,and the power generation efficiency is low.In order to improve the power generation efficiency of the SBVEH,a new type of speed bump energy harvester based on bistable vibration(SBEHBV)is proposed.The theoretical modeling and numerical simulation methods are used to study the dynamics of the SBEHBV system under different excitation conditions.The main research work is as follows:According to the simplified model of vehicle vibration,the mechanical model of the vehicle-speed bump system and the bistable power generation system is established.In the 1/4 and 1/2 vehicle models,the influence of the shape of the speed bump on the average output power and dynamic response of the system is studied,and the shape of the optimal speed bump is obtained.The influence of the model on the output power and dynamic response of the system shows that the power generation of the SBEHBV system increases with the increase of the vehicle weight.At the same time,the influence of load resistance on the output power of the system is studied,and the optimal load resistance is obtained.The effects of mean and variance on the root-mean-square(RMS)power of the SBEHBV system are studied when the vehicle model and the vehicle speed are respectively in accordance with the normal random distribution.When the vehicle type is normally distributed,the influence of mass mean on the RMS power of the system is studied.The excitation frequency is constant,the larger the excitation amplitude is,the better the power generation performance is.The influence of the mass variance on the power generation performance is obtained.The larger the variance of mass,the larger the variation of the excitation amplitude,that is,the increase of large vehicles and the high efficiency of power generation.When the vehicle speed obeys the normal distribution,the influence of the mean speed and variance of the vehicle on the RMS power of the system is studied,and the range of vehicle speed with better power generation effect is obtained.On the basis of the normal distribution of the vehicle model and the vehicle speed,the effects of the mean and variance on the power generation performance of the SBEHBV system is studied.The influence of mass mean value on power generation performance under different speed variances is studied.It is concluded that the RMS power of the system increases with the increase of mass mean value and finally stabilizes.The system generates power by analyzing the mass variance under different mass mean values.The influence of performance shows that when the mass of the car passing through the speed bump is small,the RMS power value of the system will gradually increase as the mass variance increases,but when the car mass increases to a certain value,the output of the system The power decreases as the mass variance increases.The effects of velocity mean and variance on power generation performance under different conditions are studied,and the average speed of the vehicle is obtained when the maximum RMS power of the SBEHBV system is obtained.Through the above research work,the influence law of different vehicle speed and vehicle weight on the dynamic response of the SBEHBV system is obtained,which provides a theoretical basis for the design of the SBEHBV system,which is conducive to the sustainable development of energy. |
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