A sports car steering stability analysis and optimization
|Keywords||Handling and stability Multibody system dynamics Optimization ADAMS Response surface methodology|
Vehicle handling and stability is acceptable when the car is moving and the driver's ability to control the direction of travel of the ability to stabilize. Affecting the steering stability is a key factor in traffic safety, particularly in the manufacture of modern high-speed car, the steering stability is even more important, has become an important technical evaluation of vehicle performance indicators. Therefore, how to design vehicles to improve vehicle handling and stability, and get a good security, automotive researchers have been hot issues of concern. With the rapid development of computer technology, computer simulation technology has been widely used in the automobile industry. Especially in multi-body dynamics theory, virtual prototyping technology and virtual test technology development, pioneering multi-body system dynamics based on the theory of virtual prototyping technology in vehicle handling and stability in the field of research and design applications. This paper is the use of virtual test technology and virtual design technology, in a large common software ADAMS create a sports car vehicle multibody system dynamics model, and according to research and analysis to improve the front and rear suspension type, established four different suspension Type of vehicle model, and then refer to vehicle handling and stability of the national standard test method, these four vehicle models steady steering, steering wheel angle step input characteristics, steering wheel angle pulse input characteristics, return characteristics, steering agility, hunting simulation performance analysis and comparison. Through simulation comparison, the front axle with double wishbone suspension, multi-link rear axle suspension models better steering stability. Then comprehensive evaluation steering stability as the objective function for the front axle with double wishbone suspension, multi-link rear axle suspension models were optimized handling and stability. First, calculate and analyze the suspension point on the vehicle handling and stability design sensitivity and sensitivity analysis, based on the use of ADAMS / Insight combined with response surface method affect handling and stability on the larger point suspension design has been optimized and the suspension spring stiffness, shock absorber damping and sprung mass centroid position is optimized. Then optimized simulation analysis and comparison of before and after handling and stability, according to comparative simulation curve and the processing of data shows that this approach to a certain extent, improve the vehicle's handling and stability. Finally, the front and rear suspension for a match the natural frequency analysis.