| The vehicle suspension system can buffer the vibration caused by the vehicle passing through bumpy roads,but this process consumes a lot of energy,which accounts for about 20 percent of the vehicle’s total energy.If the dissipated energy can be fully recovered and utilized,it can effectively alleviate energy tension,improve the efficiency of electric vehicle systems,and increase cruising range.For this purpose,an energyregenerative suspension was designed to achieve energy recovery and dynamic performance optimization of the vehicle suspension system.First,the overall design and working principle of the energy-regenerative suspension were analyzed,and the structural parameters of the suspension were optimized by using a multi-objective genetic algorithm.Second,a dynamic model of the energy-regenerative suspension was established,and the power generation and dynamic performance were studied and simulated.Finally,the designed energy-regenerative suspension was tested on a test bench,and the experiment and simulation showed that the energy-regenerative suspension can effectively utilize the energy of the suspension system,and ensure good ride comfort and driving stability.The specific work is as follows:(1)A general scheme of a cylindrical permanent magnet linear motor-based energy-regenerative suspension was proposed,and the structure and working principle of the motor were analyzed,and the structure of the energy-regenerative suspension was introduced.Based on comprehensively considering the performance and installation volume of the motor,it was determined that the slot-pole combination and winding form of the motor were a single-phase winding motor form with 8 poles and 9 slots,and three common magnetization methods of the motor permanent magnet were analyzed.After comprehensively considering the production process and cost factors,it was chosen to use an axial magnetization plus magnetic guide block composed of a pseudo-Halbach permanent magnet array form.The magnetic circuit of the cylindrical linear generator was analyzed,and the analytical expressions of magnetic flux linkage,induced electromotive force,power density,and electromagnetic damping were established,and finite element analysis was performed to verify its correctness.(2)A multi-objective genetic algorithm(NSGA-2)was introduced and adopted to optimize cylinder-type linear generator structure with maximum power density and minimum electromagnetic damping as optimization objectives.The main structural design parameters of cylinder-type linear generator were taken as optimization variables to obtain Pareto set of optimization results.Then combined with reality to determine optimal structural parameters of cylinder-type linear generator.(3)Two types of road models,a two-degree-of-freedom 1/4 passive suspension model and an energy-regenerative suspension model,were established.The dynamic performance of the two suspensions was compared by simulation,and the influence of structural parameters on the dynamic performance of the energy-regenerative suspension was discussed.The induced electromotive force and power generated by the energy-regenerative motor under different road and speed conditions were studied.(4)An energy-regenerative suspension prototype was developed and an experimental platform for energy-regenerative suspensions was built.The energyregenerative characteristics of the suspension under different amplitudes and frequencies were studied experimentally,verifying its effect.By comparing the experimental results with the simulation results,it showed that the theoretical derivation was consistent with the experiment,and provided some theoretical basis and experimental reference for similar research. |
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