Abstract
A novel optimization technique for optimizing the damper top mount characteristics to improve vehicle ride comfort and harshness is developed. The proposed optimization technique employs a new combined objective function based on ride comfort, harshness, and impact harshness evaluation. A detailed and accurate damper top mount mathematical model is implemented inside a validated quarter vehicle model to provide a realistic simulation environment for the optimization study. The ride comfort and harshness of the quarter vehicle are evaluated by analyzing the body acceleration in different frequency ranges. In addition, the top mount deformation is considered as a penalty factor for the system performance. The influence of the ride comfort and harshness weighting parameters of the proposed objective function on the optimal damper top mount characteristics is studied. The dynamic stiffness of the damper top mount is used to describe the optimum damper top mount characteristics for different optimization case studies. The proposed optimization routine is able to find the optimum characteristics of the damper top mount which improve the ride comfort and the harshness performances together.
Highlights
Damper top mounts are used in the vehicles to provide ideal Noise-Vibration-Harshness (NVH) performance and to improve ride comfort, driving safety, and handling
The ride comfort and harshness performance of a vehicle are evaluated at different excitation frequency ranges
The results of the optimization study show that increasing the ride comfort weighting factor q1 gradually from 0.2 to 1.0 leads to an increase in the calculated optimum damper top mount dynamic stiffness
Summary
Damper top mounts are used in the vehicles to provide ideal Noise-Vibration-Harshness (NVH) performance and to improve ride comfort, driving safety, and handling. The results indicate that the optimized suspension parameters are capable of improving IH performance of the full vehicle ADAMS model by minimizing the longitudinal and vertical acceleration responses. It is relatively easier and cost effective to change the compliance of the damper top mounts compared to changing any other suspension component characteristics to improve the vehicle ride comfort and harshness performance [3, 4, 12, 14]. A new optimization technique for damper top mount characteristics is presented to improve the ride comfort and harshness performance of a vehicle. Top mount deformation is considered as a penalty factor for the system performance
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