RESEARCH PAPERS: Internal Combustion Engines

Limitations of Rigid Body Descriptions for Heavy-Duty Diesel Engine Vibration

[+] Author and Article Information
D. M. W. Hoffman, D. R. Dowling

Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, 2019 W. E. Lay Automotive Lab, Ann Arbor, MI 48109-2121

J. Eng. Gas Turbines Power 121(2), 197-204 (Apr 01, 1999) (8 pages) doi:10.1115/1.2817105 History: Received March 23, 1998; Online December 03, 2007


Internal combustion engine vibration modeling commonly relies on assuming the engine is a linearly reacting rigid body, thereby ignoring rotating, reciprocating, and nonsolid engine components. Limitations of this approach are identified from a series of experiments on a heavy-duty in-line six-cylinder Diesel engine typical of Class VIII trucks. Measurement of all three orthogonal vibration force components were made at each of three engine mounts during standard impact-excitation modal identification tests on the quiescent engine and during engine operation. The running-engine vibration forces, measured throughout the test engine load and speed operating envelope, were projected onto the quiescent-engine rigid body modes to determine the modal content and residual vibration as a function of frequency. Modal decomposition results for the running engine show that the quiescent-engine rigid body modes, with modal frequencies between 5.6 and 26.3 Hz, account for 80 percent or more of the measured engine vibration forces for all engine speeds and loads in a bandwidth from zero to 200 Hz. The likely origins of the residual vibration within this bandwidth are discussed.

Copyright © 1999 by The American Society of Mechanical Engineers
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