| The main function of vehicle shock absorber is to transfer the force and torque between the wheel and the body,and buffer the force from road to the body.The damping coefficient of the traditional passive damper is a fixed value,and the vehicle cannot be in an ideal state under different working conditions and different road surfaces.Moreover,the traditional passive damper dissipates the energy generated by vibration in the form of heat energy.In this paper,based on a parallel mechanism based energy recovery shock absorber,the energy recovery circuit and fuzzy algorithm based control strategy is designed,damping characteristics and energy recovery characteristics are simulated and tested.The specific work is as follows:The existing energy recovery shock absorber and energy recovery suspension system are analyzed.An energy recovery shock absorber based on parallel mechanism is selected.The overall structure and working principle of the shock absorber are described in detail,the parallel mechanism and generator are analyzed and selected.A mathematical model of 1/4 vehicle 2-dof suspension based on the energy recovery damper is established.The ideal damping force of the suspension is calculated by the fuzzy algorithm.The mathematical model is built and compared with the traditional passive suspension to verify the reliability of the fuzzy algorithm.The energy recovery circuit of energy recovery shock absorber is proposed,which includes power storage circuit,super capacitor mode switching circuit and battery energy storage circuit respectively.The current changes of the power storage circuit is analyzed in detail,and the working principle of the super capacitor mode switching circuit and the battery energy storage circuit is described.A semi-active control strategy based on fuzzy control is proposed by combining the 1/4 vehicle suspension mathematical model based on energy recovery damper and fuzzy control algorithm.The simulation model of 1/4 vehicle energy recovery suspension system is established,including energy recovery shock absorber,energy recovery circuit and semi-active control strategy.The damping characteristics and energy recovery characteristics of 1/4 vehicle suspension system based on energy recovery shock absorber are analyzed by taking class B and class C pavement based on road white noise as the road roughness input and using traditional passive suspension as comparison.Simulation results show that 1/4 vehicle suspension system with energy recovery shock absorber can recover part of energy while improving the dynamic performance of suspension.Based on the existing hydraulic shock table in the laboratory,a 1/4 vehicle suspension shock absorber test bench was designed and built,and sensors were selected and analyzed according to the simulation results.The damping characteristics and energy recovery characteristics of the shock absorber are tested on the shock absorber test bench.The test results show that the suspension with energy recovery damper is slightly better than the traditional passive suspension in dynamic performance,and some energy is recovered at the same time. |
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