High frequency torsional vibration of vehicular driveline systems in clonk

The lightly damped driveline system has many lash zones, represented by low-stiffness components and thin shell elements with large modal densities. The high-frequency noise and structural dynamic modes, excited under impact conditions through low lash rate zones are of a short transitory nature, but a major concern to vehicle drivers and other road users alike. Abrupt application or release of throttle in slow moving traffic or rapid engagement of the clutch can be followed by an audible response, referred to in the industry as the clonk noise. This paper presents a complete model of a vehicle driveline for investigation of high-frequency torsional vibration using a distributed-lumped (hybrid) modelling technique (DLMT). It is shown that DLMT predictions agree well with the experimental results.

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