Self-excited Vibration Caused by Internal Friction in Universal Joints and Its Stabilizing Method

[+] Author and Article Information
M. Saigo

Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, 1-2, Namiki, Tsukuba, Japan 305

Y. Okada

Dept. Mechanical Engineering, lbaraki University, 4-12-1, Nakanarusawa, Hitachi, Japan 316

K. Ono

Unisia Jecs Co. Ltd., 1370, Onna, Atsugi, Japan 243

J. Vib. Acoust 119(2), 221-229 (Apr 01, 1997) (9 pages) doi:10.1115/1.2889707 History: Received February 01, 1995; Online February 26, 2008


Stability of a rotor system induced by Coulomb friction in joints is investigated both theoretically and experimentally. The vibrating system consists of two shafts supported flexibly and connected by three universal joints including a cross-groove (CG) joint. The Coulomb friction in a CG joint, which is one of the most destabilizing joints among practically used ones, is treated. The friction is assumed to be a function of the relative angular velocity between the connected shafts. Three stabilizing effects are investigated: the initial intersecting angle in the CG joint, the asymmetry of the support stiffness and a dynamic damper (D/D). As a result, it is found that the initial intersecting angle has a remarkable stabilizing effect; D/D expands the stable region of the system with an initial intersecting angle; the asymmetry of the support stiffness also has a stabilizing effect on the system with an initial intersecting angle. These stabilizing effects are experimentally confirmed.

Copyright © 1997 by The American Society of Mechanical Engineers
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