0
Article

Dynamics of a Multibody Mechanical System With Lubricated Long Journal Bearings

[+] Author and Article Information
B. J. Alshaer, H. Nagarajan, H. K. Beheshti

Department of Mechanical Engineering,  Wichita State University, Wichita, KS 67260-0133

H. M. Lankarani1

Department of Mechanical Engineering,  Wichita State University, Wichita, KS 67260-0133

S. Shivaswamy

Loads and Dynamics,  Cessna Aircraft Company, Wichita, KS 67277

1

To whom correspondence should be addressed.

J. Mech. Des 127(3), 493-498 (Jun 17, 2004) (6 pages) doi:10.1115/1.1864112 History: Received April 21, 2003; Revised June 17, 2004

Clearances exist in different kinds of joints in multibody mechanical systems, which could drastically affect the dynamic behavior of the system. If the joint is dry with no lubricant, impact occurs, resulting in wear and tear of the joint. In practical engineering design of machines, joints are usually designed to operate with some lubricant. Lubricated journal bearings are designed so that even when the maximum load is applied, the joint surfaces do not come into contact with each other. In this paper, a general methodology for modeling lubricated long journal bearings in multibody mechanical systems is presented. This modeling utilizes a method of solving for the forces produced by the lubricant in a dynamically loaded long journal bearing. A perfect revolute joint in a multibody mechanical system imposes kinematic constraints, while a lubricated journal bearing joint imposes force constraints. As an application, the dynamic response of a slider-crank mechanism including a lubricated journal bearing joint between the connecting rod and the slider is considered and analyzed. The dynamic response is obtained by numerically solving the constraint equations and the forces produced by the lubricant simultaneously with the differential equations of motion and a set of initial conditions numerically. The results are compared with the previous studies performed on the same mechanism as well a dry clearance joint. It is shown that in a multibody mechanical system, the journal bearing lubricant introduces damping and stiffness to the system. The earlier studies predict that the order of magnitude of the reaction moment is twice that of a perfect revolute joint. The proposed model predicts that the reaction moment is within the same order of magnitude of the perfect joint simulation case.

FIGURES IN THIS ARTICLE
<>
Copyright © 2005 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Journal bearing under dynamic loading

Grahic Jump Location
Figure 2

Lubricated journal bearing joint

Grahic Jump Location
Figure 3

Slider-crank mechanism with a lubricated journal bearing.

Grahic Jump Location
Figure 4

Reaction moment on the crank (perfect joint)

Grahic Jump Location
Figure 5

Reaction moment on the crank (dry joint)

Grahic Jump Location
Figure 6

Journal center path (dry clearance joint)

Grahic Jump Location
Figure 7

Journal center path Ott’s Solution

Grahic Jump Location
Figure 8

Reaction moment on the crank Ott’s Solution

Grahic Jump Location
Figure 9

Reaction moment on the crank (new Solution)

Grahic Jump Location
Figure 10

Journal center path (New Solution)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In