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Using Flexible Constraints to Reduce Noise in Multibody Systems With Intermittent Contact

[+] Author Affiliations
Michael S. Cherry

University of Michigan, Ann Arbor, MI

Brant A. Ross

MotionPort LLC, Ypsilanti, MI

Paper No. DETC2007-35775, pp. 1549-1555; 7 pages
doi:10.1115/DETC2007-35775
From:
  • ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 5: 6th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A, B, and C
  • Las Vegas, Nevada, USA, September 4–7, 2007
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4806-X | eISBN: 0-7918-3806-4
  • Copyright © 2007 by ASME

abstract

The application of multibody dynamics software has extended to mechanical systems with hundreds of bodies and/or hundreds of contacts. Examples include gear trains, chains on sprockets and guides, belts on pulleys, and flexible body meshes in contact with each other. These types of models frequently have intermittent contacts and contact friction that can be the source of numerical noise. This noise produces large and rapidly fluctuating force outputs that may concern the engineer, particularly when attempting to design a component or perform a failure analysis. Rigid joints are often selected to constrain the bodies undergoing intermittent contact in order to minimize the degrees of freedom (DOFs) in the model. This paper demonstrates that the use of properly-tuned flexible constraints (bushings) and contacts can significantly reduce the noise in simple and complex models with intermittent and reversing contact.

Copyright © 2007 by ASME

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