Modeling, Simulation, and Modal Analysis of a Hydraulic Valve Lifter With Oil Compressibility Effects

[+] Author and Article Information
C. T. Hatch

Bently Nevada Corporation, P. O. Box 157, Minden, NV 89423

A. P. Pisano

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Mech. Des 113(1), 46-54 (Mar 01, 1991) (9 pages) doi:10.1115/1.2912750 History: Received January 01, 1990; Online June 02, 2008


A two-degree-of-freedom (2-DOF), analytical model of a hydraulic valve lifter is derived. Special features of the model include the effects of bulk oil compressibility, multimode behavior due to plunger check valve modeling, and provision for the inclusion of third and fourth body displacements to aid in the use of the model in extended, multi-DOF systems. It is shown that motion of the lifter plunger and body must satisfy a coupled system of third-order, nonlinear differential equations of motion. It is also shown that the special cases of zero oil compressibility and/or 1-DOF motion of lifter plunger can be obtained from the general third-order equations. For the case of zero oil compressibility, using Newtonian fluid assumptions, the equations of motion are shown to reduce to a system of second-order, linear differential equations. The differential equations are numerically integrated in five scenarios designed to test various aspects of the model. A modal analysis of the 2-DOF, compressible model with an external contact spring is performed and is shown to be in excellent agreement with simulation results.

Copyright © 1991 by The American Society of Mechanical Engineers
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