400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 2001-01-1502 Integrating Test and Analytical Methods for the Quantification and Identification of Manual Transmission Driveline Clunk David A. Gilbert, Michael F. O’Leary and Jeffrey S. Rayce General Motors Corporation Reprinted From: Proceedings of the 2001 Noise and Vibration Conference (NOISE2001CD) Noise and Vibration Conference & Exposition Traverse City, Michigan April 30 - May 3, 2001Downloaded from SAE International by University of Liverpool, Sunday, August 12, 2018The appearance of this ISSN code at the bottom of this page indicates SAE’s consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition,however, that the copier pay a $7.00 per article copy fee through the Copyright Clearance Center, Inc.Operations Center, 222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sec-tions 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such ascopying for general distribution, for advertising or promotional purposes, for creating new collective works,or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department.To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior wr itten permission of the publisher. ISSN 0148-7191 Copyright 2001 Society of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the paper if it is published inSAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishing to submit papers to be considered for presentation or publication through SAE should send the manuscript or a 3 00 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USAAll SAE papers, standards, and selected books are abstracted and indexed in theGlobal Mobility DatabaseDownloaded from SAE International by University of Liverpool, Sunday, August 12, 2018Integrating Test and Analytical Methods for the Quantification and Identification of Manual Transmission Driveline Clunk David A. Gilbert, Michael F. O’Leary and Jeffrey S. Rayce General Motors Corporation Copyright © 2001 Society of Automotive Engineers, Inc ABSTRACT Driveline clunk is a phenomenon that can adversely affect customer perception of vehicle quality. Clunk iscreated by the impact of two driveline components asthey oscillate in response to a torque disturbance in thedriveline system. This disturbance is typically initiatedby a driver controlled engine torque variation, mostseverely through a throttle or clutch manipulation. Thistorque variation excites a torsional response from thedriveline, manifested by a variety of mechanisms suchas resonances of various shafts, housings and axles,clutch oscillations, and gear impacts. Becauseautomotive drivelines are complex systems composedof many rotating components, difficulty arises inidentifying the impacts that cause clunk and evaluatingthe significant parameters that can positively affectthese collisions. This paper will describe the application of analysis and test methods in the investigation of clunk in a rear wheeldrive, manual transmission vehicle. The interactionbetween analysis and test methods to designappropriate tests to isol