Browse Publications Technical Papers 2019-26-0177
2019-01-19

Prediction and Resolution of Vehicle In-Cab Noise Due to Powertrain Induced Excitations 2019-26-0177

Vehicle NVH is one of the critical performance quality parameter and it consists of vibration levels at tactile points and noise levels at ear locations for different vehicle running conditions. There are many sources of noise and vibration in a vehicle and powertrain is one of the main source. Therefore, it is important to understand and resolve powertrain induced noise and vibration issues at early design stage with efficient simulation techniques. The work presented here deals with the use of systematic CAE approach for prediction and resolution of structure borne in-cab noise due to powertrain excitations. During NVH testing of SUV vehicle, boom noise is observed at low frequency. Detailed full vehicle level simulation model consisting of Vibro-acoustic Trimmed BIW, Front and Rear Suspension and Driveline with Powertrain modal model is build. Powertrain forces due to Inertia and Combustion are applied at CG of Powertrain Modal model and in-cab noise at driver ear location (DEL) is predicted. Predicted 2EO in-cab noise shows good correlation with test. Root cause analysis carried out using various techniques such as transfer path (TPA) & operating deflection shape (ODS) analysis etc., shows that front sub-frame had vibration mode in the frequency range of issue. Based on CAE analysis, conceptual modification of rigid plate between sub-frame and vehicle body is suggested, and same gives significant improvement in vehicle in-cab noise when tested. Using simulation approach, other feasible design solutions are worked out like addition of tuned mass damper and tuning of sub-frame mounting bushing stiffness.

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