The paper describes a high frequency structure-borne vibration, manifested through coupled air-borne noise, induced by torsional impact loading of vehicular powertrain systems. Such conditions occur with sudden surge in torque demand in throttle tip-in from coast to drive condition. The high frequency transient signal is very short lived, but with a high amplitude, making the phenomenon the most annoying NVH concern to vehicle drivers, other cabin occupants and the road users. The nature of the response signal calls for the isolation of spectral contributions into regions of interest for investigation of the effect of employed palliative measures, such as foam filling of the driveshaft tubes or pre-setting of clutch springs. Signal processing at a high sampling rate with software filtration in real-time is required.
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