DYNAMIC BEHAVIOR ANALYSIS ON HANDLING AND COMFORT OF A PASSENGER CAR
César Abrahão Pereira Melo1; José Antônio Ferreira Borges2; Valder Steffen Jr2
1 Siemens PLM Software, Simulation and Test Solutions / Federal University of Uberlândia; 2 Federal University of Uberlândia, School of Mechanical Engineering
doi:10.20906/CPS/COB-2015-1987
Resumo
Automotive suspension systems are designed to allow the driver full control of the vehicle. These systems must ensure efficiently the vibration insulation of the car cabin, the tire grip on the road and the vehicle's stability while performing maneuvers. In this paper, an experimental investigation regarding the dynamic behavior of a typical passenger car is presented. The dynamic behavior analysis of the vehicle suspension aims at verifying the efforts and displacements of this system, in order to evaluate the steering response and passengers comfort. Typical ride and handling maneuvers were considered in the physical tests. The ride comfort study is presented emphasizing the required metric to quantify the vehicle comfort, according to ISO 2631. In this proposed evaluation the gains of typical transfer functions and the respective phases were built and displayed in Bode diagrams. The data collected were processed and analyzed in frequency domain using the LMS software Test.Lab and relevant aspects of the tests on the vehicle were evaluated. In general, the analyzed results in the frequency response indicate that the vehicle-A features show faster response, verified mainly due to lower phase angle when analyzing the roll angle. Comfortable vehicles tend to have lower lateral acceleration when response to Yaw, which was confirmed by low Ride Index, as it does with vehicle-B. The phase analysis had a significant influence on evaluation and Bode plots were very helpful. The procedures and results of this study will be applied to develop a multi-body model adapted to accurately simulate the vehicle's behavior. It enables to better balance the conflict between comfort and handling performance earlier in the development process.
Palavras-chave: Vehicle Dynamics; NVH; Suspension System; Handling; Ride Comfort