Research On Vibration Energy Capture Method Of Electromagnetic Rail Vehicle

Due to the special requirements of emerging technologies for power sources,traditional power supply methods have been unable to meet them,so we must find new power sources to eliminate the limitations of batteries at this stage.Energy capture technology can use the vibration capture device to convert surrounding mechanical energy into electrical energy and store it for use.The vibration-type energy capture device has become a possibility to provide electric energy for low-energy-consumption electronic components and wireless sensors,and can overcome many problems of traditional power supply methods.And with the rapid development of rail transit,the number of rail routes continues to increase,and the operation of rail vehicles is increasing.Therefore,during the operation of rail vehicles,the vibration of rail vehicles caused by the speed,quality and irregularity of rail vehicles is carried out.Energy capture deserves attention.This paper studies the dynamic modeling and simulation of the rail vehicle vertical vibration system.analyzes the excitation types of the rail vehicle system,establishes the physical and mathematical models of the rail vehicle vertical vibration system,and uses the Runge-Kutta method in MATLAB software The mass,stiffness and damping matrices of the vibration equations of 10 degrees of freedom were compiled and numerically simulated.The output response of the vertical vibration system of rail vehicles was obtained,and this was used as the excitation input for the subsequent research of the vibration energy capture device.The electromagnetic vibration energy capture device installed between the rail vehicle body and the bogie was studied.The basic theory of vibration capture technology is introduced.The basic structure and working principle of electromagnetic vibration energy capture device are analyzed.The material selection and the setting in COMSOL software are explained.The electromagnetic vibration is analyzed by COMSOL finite element analysis software.The magnetic field and output response of the energy capture device were simulated and analyzed,and the main vibration frequency between the rail vehicle vertical vibration system body and the front bogie was 0.5 Hz,and the vibration amplitude was 7.7 mm,which was used as the excitation input.The results show that the electromagnetic vibration energy capture device can effectively capture the vibration energy of rail vehicles.A single-degree-of-freedom magnetic suspension type vibration energy capture device mounted on a bogie of a rail vehicle is studied.The basic structure and working principle of the single-degree-of-freedom vibration energy capture device are described.The physical model and mathematical model of the single-degree-of-freedom vibration energy capture device are established.The response output when the amplitude,load resistance,and magnet spacing are changed.The vertical vibration of the rail vehicle body,bogie,and wheel pair is analyzed.The vibration of the bogie is selected as the input excitation of the single-degree-of-freedom vibration capture energy device.Response output of a single-degree-of-freedom vibration energy capture device under the excitation of a rail vehicle.The results show that the electromagnetic vibration energy capture device can effectively capture the vibration energy of rail vehicles.A two-degree-of-freedom magnetic suspension type vibration energy capture device mounted on a bogie of a rail vehicle is studied.The system was analyzed for dynamics,the system's governing equations were deduced,and a mathematical model was established.It was solved and simulated using numerical methods,and compared with a single-degree-of-freedom energy capture device.The following conclusions are obtained: The two-degree-of-freedom capture energy device has two resonance peaks,which broadens the operating frequency range of the capture energy device.Compared with the single-degree-of-freedom capture energy device,the output power of the two-degree-of-freedom capture energy device has been significantly improved.Under excitation and vibration excitation of rail vehicles,the output power of the two-degree-of-freedom capture device is 1.5 times that of the single-degree-of-freedom capture device.The three types of rail vehicle vibration energy capture devices can effectively capture the vertical vibration energy of rail vehicles,and can provide power for wireless sensing of rail vehicles.