Noise Source Identification in Engine by using Structural Analysis Technique
To meet the firm noise regulations for engines and overall structures noise level, noise reduction has given prime
concern by many industries like automotive, aerospace, etc. In any component which is driven by the engine considered that
the engine significantly affects the drive comfort and noise level. There are number of noise sources exist in the engine.
Reducing engine noise includes exact noise source identification and reduces the noise level as per input excitations. The
present work focuses on a detailed modal analysis of engine components and assembled engine to obtain their natural
frequencies and mode shapes which coincides with running frequency of engine and contribute to the overall noise. FEA
analysis also performed to correlate results of experimental modal analysis with FEA. Identification of maximum noise
source region is done by performing a sound pressure mapping at gear cover side also a contour plot is obtained by a run-up
engine test which gives some frequencies bands involved in maximum noise generation. The location of maximum noise
generation at a particular frequency was identified in gear cover side.
Keywords - Vibro-Acoustic, Sound Pressure Mapping, Modal Analysis, Gear Cover.