Steering and Handling Performance Optimization Through Correlation of Objective - Subjective Parameters and Multi-body Dynamics Simulation
To be published on November 21, 2019 by SAE International in United States
Event: NuGen Summit
RESEARCH OBJECTIVE: Automobile Industry has driven through the ages with continuous development with innovative technologies and frugal engineering. Expectation of customer is also increasing through the generations. To meet the customer demand for performance and be best in market, OEM needs to deliver best performance of vehicle with cost effective and short development process. Steering and Handling of vehicle is one of major customer touchpoints and needs to be tuned to achieve various conflicting requirements. The objective of this research is to optimize the steering and handling using correlation between three major methods of evaluation. METHODOLOGY: Methodology for optimization of steering and handling performance using correlation between subjective evaluation, objective measurement and multi-body-dynamic simulation is presented. In first phase, correlation of objective steering & handling parameters is established with subjective evaluation, based on evaluation of various vehicles in SUV segment. The objective parameters which give highest correlation are selected for target setting process. In second phase, Multi-body dynamic(MBD) model is developed in MSC ADAMS and is validated through physical kinematic and compliance data. Components such as suspension hardware, elastomers, steering gear boost-curves, etc. are considered for optimization. Sensitivity analysis is carried out in MBD model for identification of most sensitive components for optimization of targeted parameters. RESULTS: The components with highest sensitivity are used for carrying out design of experiments(DOE), which thus provides optimized combination of suspension and steering components for achieving targeted steering and handling performance. The optimized combination of components is then implemented on the subject vehicle. Subjective and objective evaluation of this vehicle is carried out for validation of predicted target parameters. LIMITATIONS OF THIS STUDY: This study is carried for the optimization of steering and handling parameters only. Ride is not taken for consideration. WHAT DOES THE PAPER OFFER THAT IS NEW IN THE FIELD IN COMPARISON TO OTHER WORKS OF THE AUTHOR? There are numerous papers showing the correlation between objective and subjective metrics but here we extended the correlation to Multi body dynamics model also to improve the accuracy in optimizing the parameters. CONCLUSION: This study provides a methodology of steering and handling performance optimization using correlation between subjective and objective parameters with MBD. The defined methodology is used to predict the performance of steering and handling in virtual stage of vehicle development. And, provides reduced number of iterations in physical vehicle testing to achieve target vehicle performance in shorter timeline.