Abstract
Road roughness greatly affects vehicle noise, vibration and harshness through suspension system. But till now, there hasnt been an existing suspension vibration model, which can be appropriately applied to the study of high-frequency suspension vibration. This paper is concerned with how to build one of this kind of suspension models.
Based on the quarter-car model, a new model is built by using substructure-syntheses method. The new model considers three more factors: viscoelastic components, mass of spring and local impedance of car body. They all have important effects on the high-frequency suspension vibration characteristics. Using the new model we study both the suspension vibration characteristics and the effects. Finally the new model is applied to the prediction of the car interior noise level due to road roughness. The result proves that the new suspension vibration model has enough engineering precision and that it can be used for suspension high-frequency vibration analysis.