Powertrain Surface Radiated Noise Analysis using Passive Patches

Powertrain Surface Radiated Noise Analysis using Passive Patches

Recently, the level of exciting forces from automotive powertrains has been increased and their frequency spectra become complicated due to the weight reduction and the efficiency development. However, conventional NVH solutions have limited performances since they are focused on structural modification in order to avoid the operating range of the powertrains. In this research, the effect of passive patches on the powertrain surface will be observed via computational analyses and experimental tests. From the normal mode analysis, the location of patches will be determined. Results show that the acceleration level on the Nu engine has been decreased by 10 dB with the passive patches applied.