Research Papers

Linkage Mechanisms With Cam-Integrated Joints for Controlled Harmonic Content of the Output Motion: Theory and Application

[+] Author and Article Information
L. Yuan

 EDO Marine and Aircraft Systems, North Amityville, NY 11701

J. Rastegar, J. Zhang

Department of Mechanical Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2300

J. Mech. Des 130(1), 011007 (Dec 07, 2007) (5 pages) doi:10.1115/1.2803654 History: Received September 22, 2005; Revised March 18, 2007; Published December 07, 2007

In a recent study, the authors presented a systematic method for the modification of the output motion of linkage mechanisms with closed-loop chains using cams positioned at one or more joints of the mechanism. In this paper, the method is applied to the design of a linkage mechanism with an integrated cam mechanism to eliminate high harmonic component of the output motion. The mechanism may be synthesized using any existing linkage mechanism synthesis technique. In the present study, a cam mechanism is synthesized to eliminate all high harmonic components of the output link motion of a four-bar linkage mechanism to illustrate the potentials of the present approach. The mechanism is then constructed and successfully tested. With the present method, selected ranges of high harmonic motions generated due to the mechanisms kinematics nonlinearity can be eliminated by integrating appropriately designed cams, thereby significantly reducing the potential vibrational excitation that the mechanism can impart on the overall system, including its own structure. Such systems should therefore be capable of operating at higher speeds and with increased precision.

Copyright © 2008 by American Society of Mechanical Engineers
Topics: Motion , Linkages , Mechanisms
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Figure 1

A four-bar linkage mechanism with rigid links

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Figure 2

A four-bar linkage mechanism with a cam mechanism integrated into its input to coupler link joint

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Figure 3

The output link motion and its harmonic content for the mechanism without the integrated cam mechanism

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Figure 4

The required cam mechanism generated displacement and its harmonic content

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Figure 5

The output link motion and its harmonic content with the integrated cam mechanism

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Figure 6

The overall view of the cam mechanism integrated four-bar linkage mechanism

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Figure 7

The desired (solid line) and the measured (dashed line) input link angular velocities as a function of time

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Figure 8

The measured output link angle as a function of time and its harmonic content



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