| Vehicle suspension can convert the vibration energy caused by road roughness into other forms of energy dissipation in the air.In order to improve the energy efficiency of the vehicle,the energy-harvesting suspension has become a hot topic in recent years,and the energy-harvesting technology has also been widely concerned by scholars at domestic and foreign.However,the energy recovery is realized by replacing the passive suspension with the energy-harvesting device.If the energy-harvesting device fails,the safety of the vehicle will be affected.In this paper,a magnetic energy-harvesting suspension structure with electromagnetic induction energy-harvesting element is proposed on the basis of retaining the passive suspension spring and damping structure,which ensures the safety of the original suspension and realizes the energy-harvesting function with non-contact,non-friction and non-lubrication.Firstly,the structure and size of the magnetic energy-harvesting suspension are optimized,and the optimal structural size is determined.The magnetic field characteristics and the energy-harvesting characteristics of the suspension are established,and the feasibility,safety and self-powered of the energy-harvesting suspension are determined based on theoretical calculation,simulation analysis and experimental verification.The main content of this paper is divided into the following five parts:(1)Based on the existing problems of the energy-harvesting suspension,this paper proposes a magnetic energy-harvesting suspension structure,elaborates the principle and structure of the suspension system in detail,and studies and analyzes the structural factors affecting the energy-harvesting characteristics of the suspension.The orthogonal experiment method is used to optimize the design of each structural parameter to determine the optimal size of the magnetic energy-harvesting device.(2)Based on the equivalent magnetic circuit method,the magnetic field theoretical model of the magnetic energy-harvesting suspension is established,and the stator of the energy-harvesting suspension is built.The magnetic induction intensity in the air gap is measured.The theoretical calculation,simulation and experimental results are compared to verify the accuracy of the magnetic field theoretical model.According to the theoretical model of magnetic field,the mathematical model and energy-harvesting model of suspension are established.(3)The magnetic energy-harvesting suspension system is established and simulated.The random road surface is established.The output characteristics of the magnetic energy-harvesting suspension under different speeds and different road levels are simulated and analyzed.Study on the influence of sprung mass,spring stiffness and tire stiffness of magnetic energy-harvesting suspension on energy-harvesting characteristics.(4)The prototype of the magnetic energy-harvesting suspension was developed,and the experimental platform of the magnetic energy-harvesting suspension was set up for bench test to study the energy-harvesting characteristics of the suspension under the sinusoidal excitation with multiple frequencies and amplitudes.The influence of variable system parameters(sprung mass,suspension spring stiffness,tire stiffness)on the energy-harvesting characteristics of suspension was studied.In order to verify the self-powered of the magnetic energy-harvesting suspension,the displacement sensor is selected as the load,and the sensor is successfully powered under the sinusoidal excitation of 4mm and 7Hz.(5)Finally,the theoretical calculation,simulation analysis and experimental research of the full text are summarized.Combined with the hot issues of the magnetic energy-harvesting suspension and the research results of this paper,the future in-depth research is prospected. |
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