Abstract
The refinement of low-frequency structure-borne noise generated by automotive powertrain mounting system usually adopts Transfer Path Analysis (TPA) and vehicle body plate optimisation, which require a lot of simulation or experiment work based on the vehicle body. This paper aims to propose a simple method to provide an optimal mount stiffness target for the refinement of structure-borne noise. The method is based on rigid-flexible coupling model of powertrain mounting system, and the model requires complete and accurate parameters such as mass, inertia, position and stiffness. The excitation forces of engine which are used as input of the rigid-flexible coupling model are identified by an indirect semi-experiment method. Based on this model, the direction of mount stiffness with maximum sensitivity to the dynamic characteristics of the powertrain mounting system is identified. Then, the low-frequency structure-borne noise is refined by changing the mount stiffness in this direction.
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