The temporal and spectral characteristics of crankshaft rumble noise and vibration signatures in vehicles equipped with four-cylinder internal combustion engines are studied from the viewpoint of source-path-receiver using a series of in-situ, system level operating and stationary experiments. This experimental study reveals new quantitative and qualitative time-frequency characters that have not been discussed previously. The present analysis is applied to two production vehicles of identical disign, but with substantially opposing rumble quality.
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