Browse Publications Technical Papers 2019-26-0199

Design Optimization of Engine Mount De-Coupler for Cabin Noise Refinement in Passenger Vehicle 2019-26-0199

Quieter cabins are indispensable in today's evolving automobile industry. The effective isolation of vehicle noise and vibrations are essential to achieve this. Since, low frequency powertrain induced NVH has been one of the major contributors affecting noise and vibration levels inside cabin, use of hydraulic mounts is a natural choice for all major OEMs. The objective of this study is to optimize the design of the hydraulic mount de coupler unit to reduce the abnormal noise felt inside the cabin when the vehicle was driven at 20~ 30 km/h over rough road surface, found very often in Indian road conditions. Due to lack of accuracy and repeatability errors of NVH data in actual rough road, the above road profile was captured and subsequently simulated in an acoustically treated BSR (Buzz, Squeak and Rattle) four poster. Problem investigation and countermeasure validation were performed in this facility. A significant improvement in overall cabin noise level by 2 dB (A) with a reduction of approximately 6 dB (A) in the problematic frequency zone with the countermeasure application on the mount de-coupler membrane without negatively affecting any other NVH performance parameters was achieved. A novel test methodology has been established for expedited root cause investigation & counter-measure validation of the problem statement. Design modification of the de-coupler membrane for eliminating such noises is a new approach.


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