Design And Energy Dissipation Of The Self Feedback Controlled Friction Shock Absorber

Shock absorber is an important part of the automobile suspension system, which energy dissipation performance affects the damping performance, and then affects the car's ride stable,performance and comfort. With the development of automobile industry, the requirement of the damping performance is increasing. Therefore, design and energy dissipation of the shock absorber is of great significance for the active and semi-active vibration control. In this paper,we design a new self feedback controlled friction shock absorber for cars which is combined with friction damper and hydraulic shock absorber based on the previous studies. The shock absorber can not noly adjust the damping force according to the amplitude of the vibration automatically to improve their energy dissipation performance, but also complete the active and semi-active vibration control under the actuator drive and improve the effect of the vibration control. In this paper, we have designed and established the shock absorber structure model firstly. And then we have made theoretical analysis, simulation analysis and experimental analysis to study the influence factors which affect the absorber's vibration reduction performance. At last, we have optimized the structure parameters with the aid of the previous research results. The concrete research contents are as follows:According to the design scheme, we have established the 3D solid model of the shock absorber based on solidworks to complete the parametric designs of damper structure. We have made the stress analysis of key components and complete the preliminary optimization of the structure using of the finite element software.To analyze the energy performance theoretically, we have established the static and dynamic mathematical model of the friction shock absorber based on its working principle.We have analyzed the factors, which include the initial amount of compression for the plenum chamber, the influence of actuator rod radius and the radial preload of helix friction plate,which affect the performance of energy dissipation. We use the Matlab software to get the force-displacement hysteretic curve, and make further optimization of the shock absorber structure based on the curve.For the further research on the vibration damper energy dissipation with displacement dynamic change, we established a simplified finite element model of shock absorber, addedthe internal fluid pressure load changing with the displacement on the finite element model,and got the damping force curve changing with time and displacement. At last we got the force-displacement hysteretic curves of the shock absorber.Simulation test of shock absorber performance was done by orthogonal test method. The factors, which include the initial amount of compression for the plenum chamber, the influence of actuator rod radius and the radial preload of helix friction plates were analyzed in the simulation. Analysis test found that the interaction of spiral friction plate and actuator rod radius radial preload has significant effects on the energy performance. Spiral friction plate radial preload value is the main factor which influencing the performance of shock absorber.But the pre-tightening quantity will produce some problem such as installation difficulties,large amount of wear and tear, and so on. Therefore, various aspects should be taken into account according to the practical situation to make reasonable selection of the shock absorber parameters.