Research On Design And Controller Of Semi-active Suspension Based On Magnetorheological Damper

Suspension is the most important coupling part in Vehicle, which will directlyaffect the performance of the comfort and safety of passenger. Due to low prices andrelatively simple manufacturing process and better damp, the magneto-rheological havebroad application prospects during the semi-active suspension. The main purpose of thispaper is to study the multi-objective optimization of suspension of oil and gas withuncertainty. It made effective control strategy for the magnetorheological semi-activesuspension, and provide reference for engineering applications.Based on the understanding of the principles, characteristics and the research statusof magnetorheological damper at abroad, established the full model with seven degreesof freedom vehicle model integrated with magnetorheological damper model bySIMULINK.Mining vehicles have a very poor road conditions, and the load cargo alwayschange a lot. The position of centroid and sprung mass will change, due to changes inthe way of loading cargo. Although the single uncertain variable is in a small range,when coupled together, it may cause a large deviation for the objective function. It hasimportant theoretical and practical significance. Considering the impact of uncertaintyon the parameters of optimal design of vehicle suspension.The paper established an approximate model high dimensional models, and verifythe accuracy of the approximation model. Consider the uncertainty of sprung mass andcentroid position, proposed the optimization problem of double nesting combinedNSGA-II with IP-GA. Optimized the range of uncertainty by multi-objectiveoptimization with Pareto based on genetic algorithm. Taking into account the11targets,included the acceleration of centroid of vehicle, the pitch angle of vehicle body, the rollangle of vehicle body, the dynamic deflections of front left suspension, the dynamicdeflections of front right suspension, the dynamic deflections of rear left s uspension,the dynamic deflections of rear right suspension, the dynamic load of front right wheel,the dynamic load of front right wheel, the dynamic load of rear left wheel, the dynamicload of rear right wheel, compared with a single target or two goals, it can provide moreoptions for the designers.The target control was applied, the characteristics of Magnetorheological damper.Introduced some control theory, included PID control, fuzzy control, fuzzy-PID control, neural-fuzzy control, and analysed the performance of targets contained theacceleration of centroid of vehicle, the pitch angle of vehicle body, the roll angle ofvehicle body, the dynamic deflections of front left suspension, the dynamic load offront right wheel. The results show that the four control strategies are effective, andcan improve the performance of goals in varying degrees. And the fuzzy-PID controland neural-fuzzy control are more obvious, which greatly improve the ride comfortand driving safety.