| Vehicle dynamic simulation technique is a powerful tool for auto design and production. As a general technique to increase national competition, it's the international research focus for decades.In the traditional designed model, the mode for systematic analysis of kinematics and dynamics does not consider the suspension of the actual structure, only a single force between body and wheel suspension pivot points. In the suspension system design is the use of more vehicles with two degrees of freedom or four degrees of freedom model. Mechanical analysis of these models to calculate the success in reducing the workload of the analysis of the problem becomes very simple and very easy to write and solve the differential equation system, although in many occasions can be more accurate analysis results. However, dynamic analysis, the vehicle suspension system of the structure and characteristics of the dynamics of the vehicle impact response characteristics, and design patterns in the traditional structure of the various types of suspension and its effect on vehicle performance characteristics of the not reflect the impact. In the design of suspension, the suspension system and the vehicle can not match the relationship between the model above described, from the perspective of vehicle design for the suspension to provide reliable design information.This paper explores a method of dynamic load simulation with a simple structure based on the vehicle suspension node, it can accurately reflect the suspension of power and status of the body. Therefore, in the early stage of vehicle design, provides a reliable reference for the suspension from the perspective of vehicle design. There are four parts in the dissertation.1.The history of vehicle dynamic model and distinctness are discussed; the contents of the dissertation are put forward, and Research methods of multi-body dynamics Directed towards the traditional model of vehicle suspension design deficiencies,the intention and the significance of the dissertation are discussed and the key content and method of research are defined.2. Detailedly introduced the constrain equations of the spherical joint, revolute joint, cylindrical joint and translational joint. Using the classical Newton - Euler method introduction set up the dynamic equations, detailedly introduced the main vector and the main moment of inertial force simplify to the Center of mass, hinge binding and constraint torque.3. For the simple structure of the vehicle suspension nodes, establish the simplified model of McPherson Suspension. Set up the Kinematics model of suspension. Set up the static Analysis Model of flexible binding force of suspension shock absorber. using the classic Newton - Euler's method of dynamics subsystem to set up the dynamic equations, can be obtained between the suspension and body-oriented and the internal interaction of Internal suspension.4. Set up CarSim vehicle model, find the status of the body mass center and wheel center. Input them into the dynamic load calculation program of this paper. Compare the simulation results with the ADAMS results. It proves that the dynamic load calculation method of this paper is correct.In this paper, the simplified model of suspension for dynamic load calculation is based on the specific structure of simple node, enter the parameters of the model structure for the actual suspension hard points and the elastic properties of the spring shock absorber, which calculated the rigid body's internal force and torque within the actual situation is closer to can be obtained correctly between the suspension and body-oriented, and use this model to simulate high-fidelity hinge. When the structural parameters change, simply re-enter the location of a small number of hard-point shock absorber spring elastic parameters and characteristic parameters, we can model for simulation analysis of the suspension, which can greatly shorten the vehicle development cycle, reduce vehicle development costs.
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