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In order to make the Baja racing car with better maneuvering stability, the ADAMS/Car module is used to build the front suspension structural model of the Baja racing car. Through the model simulation test, the influence of each positioning parameters of the suspension on the performance of the Baja racing car suspension is analyzed. The obtained results gradually optimize the position of each hard point. By optimizing each positioning parameter, the overall performance of the suspension is significantly improved, so that the racing car has good handling and stability. The method described in this article makes suspension optimization faster and more accurate. Introduction Baja SAE China, or BSC for short, is a college student SUV race sponsored by China Society of Automotive Engineer. The participating teams are required to create a small SUV that complies with the competition rules within one year according to the rules of the competition. The dynamics of the race include traction, winding, linear acceleration, control and endurance competitions [1] . The design of a good suspension has a significant impact on the vehicle handling stability of a car. Reasonable suspension positioning parameters can make the car have good kinematics and steering stability [3] [4] . In this paper, the coordinates of each hard-point of the front suspension are extracted from the UG digital model, and the front suspension system is modeled by ADAMS/Car module. Through the parallel wheel travel, and gradually change the coordinates of the hard points that affect the suspension positioning parameters gradually, so as to achieve the desired optimization results. Selection of Front Suspension Structure and Establishment of Simulation Model By comparing the forms of the various front suspension systems which are widely used nowadays, considering the cost, the ease of manufacture, positioning, assembly, adjustment and maintenance as well as the reliability of the suspension movement, Rack program. For unequal-length double-wishbone independent suspension, the required center of roll center and track pitch can be obtained by appropriately selecting the length of the upper and lower arms, the angle of the cross arm and the size of the steering knuckle, etc. The front wheel positioning and other parameters of the favorable changes in law, to ensure good suspension performance [2] . Double-wishbone suspension has great space flexibility, easy to adjust, adjustable parameters, small changes in roll, the tire grounding area, so that the car has a good grip, high structural reliability, and easy to Guarantee racing stability. According to the design parameters of the front suspension, three-dimensional modeling is done in UG software and the coordinates of each hard point are obtained therefrom, and the dynamic simulation model is established in the ADAMS/Car module by using the coordinates of each hard point. The hub and the steering knuckle are connected through a rotating pair, the knuckle is connected with the steering tie rod through a ball joint pair, the steering knuckle is connected with the lower sliding column through a universal joint, the upper sliding column is connected with the bodywork subsystem through a universal joint, the steering knuckle passes through a shaft sleeve Respectively, with the upper and lower control arm connected to the upper and lower control arm connected to the frame by rotating the deputy [5] , established kinematics model as shown below: 151 Figure 1. Front suspension simulation model. Kinematic Simulation Analysis of Suspension Based on the design of dynamic and static deflection of suspension system, the upper and lower bounce heights of the wheels are respectively selected as +140mm and -70mm, with the help of ADAMS/Car module. Front suspension for a preliminary analysis. Due to the inconvenience of the structural design of the steering knuckle, the simulation test does not change the outer point of the upper arm and the lower arm, that is, fixes the kingpin inclination in the static state at first, so that the number of numerical iterations can be reduced and the design target can be closer to the design target Value, mainly consider the upper and lower arm of the front point, the rear point, a total of four coordinates of twelve coordinates, due to race car design rules and frame structure constraints, selected from the twelve coordinate values can provide changes The six coordinate values, i.e., the Z coordinate and X coordinate of the upper arm and the X coordinate of the lower arm and the X coordinate of the lower arm, ADAMS/Insight observes its influence on the suspension positioning parameters [7] as follows: Figure 2. The influence coefficient of coordinates values on the kingpin incl. angle. Figure 3. The influence coefficient of coordinates values on the caster angle.

Optimization of Baja Racing Car Front Suspension Parameters Based on ADAMS