Transient Clunk Response of a Driveline System: Laboratory Experiment and Analytical Studies

Document Number: 2007-01-2233

Date Published: May 2007

Author(s):
Jaspreet S. Gurm - Ford Motor Co.
Wan Joe Chen - Ford Motor Co.
Amir Keyvanmanesh - Ford Motor Co.
Takeshi Abe - Ford Motor Co.
Ashley Crowther - Ohio State Univ.
Rajendra Singh - Ohio State Univ.

Abstract:
A laboratory experiment is designed to examine the clunk phenomenon. A static torque is applied to a driveline system via the mass of an overhanging torsion bar and electromagnet. Then an applied load may be varied via attached mass and released to simulate the step down (tip-out) response of the system. Shaft torques and torsional and translational accelerations are recorded at pre-defined locations. The static torque closes up the driveline clearances in the pinion/ring (crown wheel) mesh. With release of the applied load the driveline undergoes transient vibration. Further, the ratio of preload to static load is adjusted to lead to either no-impact or impact events. Test A provides a ?linear? result where the contact stiffness does not pass into clearance. This test is used for confirming transient response and studying friction and damping. Test B is for mass release with sufficient applied torque to pass into clearance, allowing the study of the clunk. A set of non-linear differential equations describe the experiment and the applicable dry friction coefficients are experimentally found. Various test conditions (corresponding to no impacts, and single-sided or double-sided impacts) are successfully simulated. Numerical and experimental time histories compare well.

File Size: 909K
Product Status: In Stock

Included in: V116-6

See other papers presented at SAE 2007 Noise and Vibration Conference and Exhibition, May 2007, St. Charles, IL, USA, Session: Engine / Powertrain / Driveline: Driveline (Part 3 of 3)

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