Study of Low-Frequency Driveline Clunk During Static Engagements

Examination of Clunk Phenomena Using a Non-Linear Torsional Model of a Front Wheel Drive Vehicle With Manual Transmission

“…Impulsive events may be followed by significant oscillations at the first torsional mode and/or structural resonances of propeller or drive shafts, axles, and housings [1]. Though the literature [1][2][3][4][5][6][7] on clunk is sparse, the path seems to be structureborne as impulses are transferred to the receiver (passenger compartment) via axle, chassis, suspension elements and mounts [2]. Among the earlier studies, Krenz [3] introduced experimental results and identified some empirical design guidelines that could be utilized to reduce the severity of clunk.…”

“…He had found such methods to be useful in controlling the transient responses, which greatly differ from typical steady state responses within the drivelines. Several recent investigators have used numerical simulations and laboratory tests to better understand such problems [1][2][3][4][5][6]. For instance, Gibert et al [1] have utilized the lumped parameter approach.…”

“…For instance, Gibert et al [1] have utilized the lumped parameter approach. Chae et al [2], Biermann and Hagerodt [4], and Menday et al [6] have implemented the multi-body dynamics or the finite element methods. Biermann and Hagerodt [4] have also tried to simulate possible real-life clunk conditions in their experimental set-ups.…”

“…In order to properly address this problem, a suitable nonlinear simulation model is needed since backlashes between the gear pairs or splines, as well as other clearances within the driveline system could potentially induce impacts between the moving parts and thus generate clunk-type noise and vibration problems [1][2][3][4][5][6][7]. In particular, Couderc et al [8] analyzed the torsional vibration of a driveline when subjected to a torque pulse; their models included two non-linear elements, such as a multi-valued clutch damper and a gear pair with backlash.…”

Experimental Evaluation of an RWD Vehicle With Parameter Extraction for Analytical Modeling and Evaluation

“…Tip-in (TI), tip-out (TO), or consecutive tip-in followed by tip-out (TITO) induce torque requests which take the shape of step function inputs on the driveline. TITO maneuvers are understood to excite shuffle and consequential clunk if lash is traversed during a torque reversal Such a reversal indicates a change in contact region of the geared components [2][3][4][5][6][7]. Clunk is defined by two categories, both with broadband frequency response.…”