The Research Of The Rule Between The Automobile Wheel Alignment Parameters And The Suspension Structure

With the automobile speed increased continually, the consumers' demand for safety and handling stability is becoming higher and higher. As one of the most important content in the Automobile design for disposal and the kinematic check, suspension system has very important effect to vehicle's dynamic(such as hanlding stability, compliant capability and so on).Then the suspension structure and the automobile wheel alignment parameters that decided by suspension has a direct effect to vehicle's handling stability. So whether the suspension system design successfully or not become one of the key factors which decide vehicle's design level in the design process.Recently, the virtual prototyping simulation technology becomes an independent technology relatively. It comes from the research to multi-body system dynamic which merged with virtual reality technology and artificial intelligence technology. It is a synthetic technology. Its central part is multi-body system dynamic, modeling theory and its realization. Researching and developing the virtual prototyping simulation technology which is practical and efficient can improve the quality of product and shorten the development period of product. So it provides a new way for complicated product design in the manufacturing especially the vehicle.This paper uses virtual prototyping software ADAMS, unites the knowledge for multi-body system dynamic, to experiment on suspension system and the vehicle in some specified road. Finally, it tries to find out the rule between the automobile wheel alignment parameters and the suspension structure.Firstly, build the three-dimensional model of a car's front Macpherson suspension, experiment on suspension model in dynamics, discuss the suspension parameters' variation rule during driving and research its influence of handling stability and compliant capability.Secondly, use virtual prototyping software ADAMS/CAR to build the vehicle virtual prototyping simulating model including the rear suspension, the steering system, the powertrain, the front and rear tires and the body with the front suspension; Use the driving machine in the ADAMS/CAR to experiment on the vehicle model with road actuation. Confirm the vehicle's driving situation and driving path primarily according to the driver control files and driver control data files that wrote successfully by author. It makes the vehicle test in some specified driving situation and road, simulates the vehicle driving situation both in the road which roughness value is fixed and in the road which roughness value is changed by selecting different road roughness value, evaluates the car's handling stability by comparing the two different results.