RESEARCH PAPERS: Internal Combustion Engines

Effect of Inertia Variation Due to Reciprocating Parts and Connecting Rod on Coupled Free Vibration of Crankshaft

[+] Author and Article Information
S. Rajendran, M. V. Narasimhan

Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, India

J. Eng. Gas Turbines Power 119(1), 257-263 (Jan 01, 1997) (7 pages) doi:10.1115/1.2815557 History: Received August 01, 1996; Online November 19, 2007


The inertia due to reciprocating parts and connecting rods, as felt by the crankshaft, varies with the crank angle. The effect of inertia variation on torsional free vibration of crankshafts has been studied extensively. In this paper, the effect on combined torsional and bending free vibrations is examined. Single-cylinder engine crankshaft geometry is considered for the study. The results indicate that the inertial coupling, introduced by the reciprocating parts and connecting rod, significantly influences the free vibration characteristics, particularly when the natural frequencies of the crankskahft are closely spaced. The results suggest that, under such conditions, modeling the crankshaft as a pure torsional system would involve considerable error.

Copyright © 1997 by The American Society of Mechanical Engineers
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