During the MBS Tech Days 2021, Manohar H C from Mercedes-Benz R&D India held a presentation titled "MBS-FE Simulation Methodology for Front Differential Whine Noise".

Front Differential Whine noise is a major concern and is a structure-borne vibration of the driveline due to Hypoid gear excitations. Identification of the vibration transfer path and optimizing the relevant structural components is the key to the solution.

We used Simpack to develop a flexible MBS model similar to the test bench considering the excitation from the Hypoid gear. MB Simulations were performed and a critical frequency where the response has to be reduced was identified. In general, mass and stiffness are varied to provide a solution for reducing the response at the critical frequencies. However, this approach is not optimal as it does not help to determine the exact location of the structure to be modified. We analyzed in detail mode shapes of the flex states contributing most to the vibration response at the critical frequency. The operating mode shape at the same critical frequency was reestablished in FE for structural optimization by using cutting forces from previous MBS analysis. MBS simulations were repeated on the optimized structure to verify the developed methodology.

Manohar H C works as CAE Analyst at Mercedes-Benz R&D India. Manohar has around seven years of experience in NVH Simulations and is currently supporting front axle whine simulations for Mercedes-Benz cars.

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