To prevent the occurrence of the cavitation phenomenon in hydraulic shock absorber, the production process of the cavitation during the recovery process of shock absorber is studied, and the parameter model of cavitation production mechanism is built. Based on Computational Fluid Dynamics (CFD) numerical method, a high-precision mesh model of shock absorber is established and the simulation analysis is carried out by using FLUENT software. Therefore, the specific position and distribution of cavitation in the hydraulic shock absorber are obtained, and the measures to inhibit cavitation are put forward. Finally, the simulation results are verified by experimental study and the experimental results show that the cavitation is mainly distributed around the recovery valve of shock absorber, and the cavitation phenomenon becomes more obvious with increasing the piston speed; using low viscosity oil and increasing the diameter of piston rod can effectively inhibit cavitation phenomenon. This study provides a certain reference for preventing the cavitation phenomenon of hydraulic shock absorber.
ARTICLE HISTORY
In order to eliminate excessive slip phenomenon of driving wheels during the driving process for distributed driving electric vehicle, an acceleration slip regulation strategy is analyzed and proposed. Based on Burckhardt tire model, a real-time road estimator is designed to obtain the current road adhesion coefficient and the optimal slip rate, and the torque fuzzy controller is designed to adjust the driving torque of each driving wheel. Then the slip rate accurate control for distributed driving electric vehicle is realized, and the slip rate of each driving wheel is changed within the optimal slip rate range. Simulation results show that the proposed acceleration slip regulation strategy can enable the distributed driving electric vehicle has better dynamic and stability.INDEX TERMS Acceleration slip regulation, distributed driving, road identification, fuzzy control.
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