Research On Optimization Design Technology Of Bottom-protected Vehicle Suspension System

For the frequent use of landmines or simple devices in asymmetric warfare,without affecting the ride comfort and mobility of vehicles the key point to enhance the vehicle's ability to resist explosion and impact and protect occupant safety.Therefore,it is very important to analyze and optimize the relevant parameters of the important parts of the protective vehicle to improve the protection capability of the vehicle.As an important part of the body,suspension can play not only the role of transfer force,but also play the role of mitigating impact.In this paper,a bottom protected vehicle is taken as the research object,and the protection performance of suspension system under explosive environment is studied through theoretical analysis,numerical simulation and experiment.The main contents are as follows:First,the development of the bottom protection vehicle at home and abroad and the development of the suspension system are studied and the research on the occupant damage under the explosion shock is carried out.Second,analyze the wheel 500g TNT explosion finite element simulation of different suspension system,comparison of suspension BDC and TDC acceleration data results,calculate the suspension system relative to TDC and BDC acceleration attenuation ratio,determine the coil spring suspension system as the research object in this paper to.Third,the model of the whole vehicle is modeled,the material parameters of the target vehicle are studied and the boundary condition of the model under the condition of explosion is established.The accuracy of the vehicle model is verified by the simulation and test of the explosion of the whole vehicle.Fourth,the single factor analysis on the effect of the spring stiffness of the spiral spring suspension system and the damping coefficient of the damping system on the anti explosion impact of the suspension system was carried out.It provides a suitable design variable for the multi-objective optimization design of the following suspension system.Fifth,by using the design of the Latin hypercube test,the establishment of the vehicle agent model and the multiple-objective genetic algorithm,the optimization design of the spiral spring suspension system is carried out.After optimization,the response of the body structure and the response of the shinbone damage of the occupant decreased significantly compared with the results before the optimization.The anti explosion impact capability of the spiral spring suspension system is improved,which effectively improves the bottom protection performance of the whole vehicle.