Simulation Analysis And Optimization Of Vehicle Handling Stability Based On ADAMS

Research on vehicle handling stability needs repeated trial and test, which can cause costly expenses and long design cycle. Furthermore, it may be really difficult to realize some experiments because of security. However, this becomes simple if we use the virtual simulation methods. Simulation can be realized repeatedly by altering design parameters when the vehicle model is finished. Simulation technology is increasingly widely used in the automotive engineering field nowadays. The handling stability is mainly studied by computer simulation theories and high-performance simulation software. The analysis, optimization and improvement of automotive design parameters can be realized by the aided design means. The following directions are expanded in the research.1. The main subsystems, such as front suspension systems, steering systems, rear suspension systems, brake systems, poweroperated systems, body and tires, are established by revising the template parameters and the positions of keypoints in ADAMS/CAR software. Then the model of entire car is constructed.2. The simulation of open-loop following characteristics aimed to vehicle model is researched according to GB/T6323-1994. It includes steering wheel angle step input, steering wheel angle pulse input, returnability, transient and stable response characteristics of steady turning. At the same time, the following response characteristics of the driver-car-path closed-loop system with the driver model are researched, including snake-shaped tests and turning portability tests followed a given path. The results show that the handling stability of the car is in condition on whole according to QC/T480-1999 standard.3. According to the analysis of simulation results, the performance with low rank scores are regulated by optimizing the mass of vehicle, the axial load of the first axis, the torsional rigidity of the back antiroll bar. And the handling stabilities with optimization or not are compared. The results show that the stability can be improved by altering these parameters.Based on the simulation results, we can find that the car possess better returnability, snake-shaped performance, turning portability and steady turning performance. However, the lateral acceleration of the neutral turning point and the transient turning performance are not so good. The three parameters, such as the mass of vehicle, the axial load of the first axis, the torsional rigidity of the back antiroll bar, are used as the optimum design parameters to analyze the multibody system of vehicle in the study. It indicates that the turning performance of automobile is improved obviously.