The Handling Stability Research Of An Independent Front Macpherson Suspension Car

Since 1980s, the status of automobile has been becoming more and more outstanding in transportation field and people's daily lives. The competition of national and international automobile markets has become drastic unprecedented, and consumers' demand for safety, handling stability and ride comfort is becoming higher and higher. Automobile suspension system is the most pivotal subsystem that affecting vehicle's dynamic performances, and the automobile wheel alignment parameters that decided by suspension has a direct effect to vehicle's dynamic handling stability. Therefore, the kinematic/dynamic simulation analyses of suspension plays a very important role in suspension's design and exploitation.As suspension system is a complex multi-body system, the movement relations between parts is very complicated , which brings much difficulty for analyzing suspension's performances by traditional calculating methods.Based on mechanical CAD design and virtual prototyping simulation technology, this paper suggested a design method for analyzing and optimizing vehicle suspension by using virtual prototyping software ADAMS/CAR.First, build the three-dimensional CAD model of a car's front Macpherson suspension according to the relative movement relations and parameters of all parts and analyze the suspension parameters' variation rule during driving after adding road actuation. Then optimize the suspension structure and get an optimized result for the suspension system by using ADAMS/Insight.Based on the above, the author built the vehicle virtual prototyping simulating model including the front and rear suspensions, the powertrain, the steering system, the front and rear tires, wrote the driver control files(abbreviation. dcf) and driver control data files(abbreviation. dcd) for vehicle handling stability simulation analyzing according to the requirements of the current standards GB/T6323.1-94-GB/T6323.6-94 of our nation's for vehicle controllability and stability test, carried out simulation and analyses for vehicle handling stability such as steering wheel angle step input test, returnability test, steady static circular test, pylon course slalom test and steering efforts test, and evaluated the car's handling stability performance by scoring according to GB/T 13047-91 ?Criterion thresholds and evaluation of controllability and stability for automobiles?.