General Equations of a Helical Spring With a Cup Damper and Static Verification

[+] Author and Article Information
Ming Hsun Wu, Jing Yuan Ho, Wensyang Hsu

Institute of Mechanical Engineering, National Chiao Tung University, Taiwan, ROC

J. Mech. Des 119(2), 319-326 (Jun 01, 1997) (8 pages) doi:10.1115/1.2826254 History: Received February 01, 1996; Revised November 01, 1996; Online December 11, 2007


In this study, we derive the general equations of motion for the helical spring with a cup damper by considering the damper’s dilation and varying pitch angle of the helical spring. These dynamic equations are simplified to correlate with previous models. The static force-displacement relation is also derived. The extra stiffness due to the damper’s dilation considered in the force-displacement relation is the first such modeling in this area. In addition, a method is presented to predict the compressing spring’s coil close length and is then verified by experimental data. Moreover, the simulation results of the static force-displacement relation are found to correspond to the experimental data. The maximum error is around 0.6 percent.

Copyright © 1997 by The American Society of Mechanical Engineers
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