| Suspension system has a significant impact on vehicle ride comfort and handling stability.At present,there are mainly three forms.Passive suspension,active suspension and semi-active suspension.Traditional passive suspension design is simple,reliable and durable,but it is difficult to take into account the smoothness and stability;active suspension can achieve both smoothness and stability,but because of its complex structure,high precision requirements,high prices and low reliability and other reasons can't be widely used;The semi-active suspension can take into account the advantages of the above two types of suspension.Its simple structure,low power consumption,and can achieve similar performance with active suspension,so it has a broad development prospect.In this paper,an SUV is used as the object,and a damping continuously adjustable semi-active hydraulic interconnected suspension system is studied to verify the improvement of the vehicle dynamics performance.The main research contents and results of this article are as follows:(1)Based on the state space method,the modeling principle and process of the whole vehicle with matching hydraulic interconnection suspension are studied,and the fourth-order Runge-Kutta method is used to solve the vehicle dynamic response.At the same time,this model is compared with the CarSim/AMESim/Simulink joint simulation model to verify the effectiveness of the mechanical-hydraulic coupled mathematical model.(2)Study the mechanism of damping in hydraulic interconnected suspension system,establish the mathematical model of the damping valve,and apply it to the hydraulic interconnected suspension system.The parameter sensitivity analysis of the hydraulic system is performed based on the uniaxial pulse excitation.The result shows that the change of the throttle area of the damping valve has the greatest influence on the ride comfort of the vehicle.Finally,the influence of the hydraulic interconnection suspension system on the modal damping of the vehicle is analyzed,and the variable throttle area of the damping valve is obtained through the optimal damping matching method.(3)Based on fuzzy control theory,select input and output variables,formulate fuzzy control strategy and design a fuzzy controller.Combine this controller with the mechanical-hydraulic coupled vehicle model to adjust the throttle area of the hydraulic valve damping valve.The semi-active control of vehicle motion and the sinusoidal excitation simulation test verify its good fuzzy control effect.(4)Establish a random road simulation model,combine the vehicle ride comfort and stability test methods and performance evaluation indicators,compare the performance of vehicles with passive suspension and semi-active suspension.The results show that the semi-active hydraulic interconnection suspension system can greatly improve vehicle ride comfort while ensuring stability. |
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