A study on powertrain modes for optimizing the NVH performance

The stiffness and positioning of engine mounts are crucial factors in determining the powertrain rigid body modes and distribution of kinetic energy. Therefore, optimizing these mounts is essential in the automotive industry to separate the torque roll axis (TRA) and minimize vibration. This study aims to enhance mount locations by isolating the engine rigid body modes and predicting the inter-component forces (ICFs) and transfer path analysis (TPA) of the vehicle. The individual ICFs for engine mountings are calculated by applying a unit force at the bearing location. Critical frequencies are identified where the amplification exceeds the input force at the mounting interface between the engine and the frame. TPA is utilized to assess and rank vibration contributions through different structural transmission channels within a system. Both ICF and TPA analyze the source and path characteristics linked to critical response frequencies. This understanding aids in enhancing mounting positions to minimize vibration levels, thereby enhancing NVH performance.