Dynamic Modeling And Simulation Of The Chassis Of Excelle Car

The automotive industrial has developed for more than one hundred years since the first car was borne. Nowadays, car has become a essential part of human society. The scale and manufacturing of automotive industrial are the primary signs for evaluating the rank of national industrial. Due to customs'higher require to the quality and scientific progress, the design methods of automotive have changed a lot. There are three stages during the history of automotive: experienced engineering, experienced & technical engineering and computer assistant engineering (CAE). CAE has made great achievements in cutting down the period and the cost and the risk for developing new product. It also greatly reduces the heavy work of designers so they can concentrate on doing creative job.The technology of virtual prototyping bases on the multi-body system dynamics, including computer graphics, control and optimal theory etc. The technology of virtual prototyping has been commercially developed abroad for many years and several products such as ADAMS have been introduced to engineers. Nowadays, the virtual prototyping technology is the main method for developing mechanical products and applied in the whole developing period.The content of this paper is a part of the project that conducted by Prof. Guanxin. In this paper, a virtual prototyping model based on the parameters of Excelle is developed in ADAMS/Car circumstance. And analyses about handling and stable characters of suspension and entire car are discussed basing on the simulative results. In the first section of the paper, the basic theory of ADAMS is introduced. ADAMS use the Cartesian Coordinate and Eula Angle as generalized coordinate. And ADAMS deduces the differential equations using lagragian equations. Then the kinetic & dynamic equations and its solving in ADAMS are introduced. Static analyses and linear analyses are also introduced. Additionally, the solving of differential equations is simply introduced.The third parts of this paper discusses detailedly in developing the virtual prototyping model and kinetic simulation about suspension subsystem of Excelle. The design project of suspension will meet not only the requirement of riding comfortability but also the requirement of handling stability. Excelle use Macpherson as front suspension. ADAMS/Car offers the template of Macpherson, so the virtual prototyping model of front suspension is developed by modifying the template's parameters such as pointing coordinate, part's mass character, spring character, absorber character, bushing character and etc. The simulation of double wheel same directional motion is simulated by using the model on suspension test rig. The changing rules of wheel orientation parameter, wheel track, suspension stiffness under wheel motion are analyzed. Excelle use multi-bar as rear suspension. ADAMS/Car does not offer the template. So the template of rear suspension is firstly built in professional mode using topological approach. Then the virtual prototyping model of rear suspension is developed by modifying the template's parameters such as pointing coordinate, part's mass character, spring character, absorber character, bushing character and etc. The simulation of double wheel same directional motion is simulated by using the model on suspension test rig. The changing rules of wheel orientation parameter, wheel track, suspension stiffness under wheel motion are analyzed.The virtual prototyping models of body, steering, powertrain, tire, brake and antiroll bar subsystems are developed in fourth part. Then the entire virtual prototyping models is realized by assembling the subsystems. Handling stability is concernful not only for steering portability but also for driving safety under high speed. So it is called as"Lifeline of high speed vehicle". According to GB/T 6323-94 controllability and stability test procedure for automobiles and ISO double-line test procedure, the simulated tests are performed using the entire car model. The results of simulation are evaluated according to industrial standard QC/T480-1999.The independent rear multi-bar suspension template is built and introduced in this paper. This template enriches the suspension structural shapes of ADAMS/Car. Building suspension and entire car virtual prototyping models. Simulating models for testing and analyzing. Founding a new way in testing assembly dynamic model. Enriching Class A car database. Building foundation for matching performance of chassis.