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Suspension system is the key component affecting vehicle ride comfort and finding out the main factors affecting suspension system vibration is the precondition of controlling suspension system vibration and improving vehicle comfort. Based on the principle of robustness analysis, the robustness analysis process of suspension system vibration influencing factors is constructed, in order to solve the problem, the three levels of front suspension stiffness, front suspension damping, rear suspension stiffness and rear suspension damping are selected, the experiment design scheme is adopted, power Spectrum of Class A road is used as input excitation source for suspension system simulation, the weighted acceleration root mean square simulation experiment of suspension system vibration under the influence of multiple factors is carried out.

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The suspension system is the main component that affects the NVH (Vibration, Noise, Harshness) performance of vehicles. By optimizing the key influence factors to improve the vibration of the suspension system, the comfort of car deriving could be improved greatly. Based on this consideration, the researcher proposes to apply the Taguchi method to study the contribution of different factors to the vibration of the suspension system and obtain the main influencing factors that need to be controlled. In the research, the researcher established an active suspension test system and designed a scheme which contains four factors and three levels to test the stiffness and damping properties of the front and rear suspensions under different parameters by setting the A-level road power spectrum as the input excitation of the suspension system. According to the weighted root-mean-square of acceleration, the researcher conducted the optimized calculation and analysis. It is found that the vibration contribution of each influencing factor is: the suspension stiffness is 46.81%, the front suspension damping is 15.87%, the front suspension stiffness is 4.30%, and the influence of the rear suspension damping is negligible. Results of tests and analysis offer an accurate and reliable reference for evolving suspension systems and improving the NVH.