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Analysis of a Flexibly Mounted Shaft Incorporating a Non-Constant Velocity Coupling With Dynamic Misalignment

[+] Author Affiliations
David R. Johnson, K. W. Wang

University of Michigan, Ann Arbor, MI

Paper No. DETC2011-48421, pp. 1023-1032; 10 pages
doi:10.1115/DETC2011-48421
From:
  • ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 23rd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
  • Washington, DC, USA, August 28–31, 2011
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5478-5
  • Copyright © 2011 by ASME

abstract

Some shafting systems, such as those in certain types of rotorcraft, are mounted on flexible foundations. Since the foundation can deform, shaft segments are joined by flexible couplings to accommodate motion. Many of these couplings are non-constant velocity, meaning there is a difference in angular velocity between the input and output of the coupling, and this difference can lead to large motion in the shaft system. In this paper, a model is developed which allows the misalignment angle between the input and output shafts to vary dynamically with time, and this kinematic relationship creates a nonlinearity in the system. Through nonlinear analysis and accompanying simulation, this research explores some interesting and potentially harmful phenomena which occur at secondary resonances of such a shaft system. At particular shaft operating speeds, the shaft system may experience internal resonance, large and rapid amplitude growth, or chaotic motion, all of which can lead to destructive large amplitude vibration. This paper also shows that applying appropriate damping is an effective strategy for mitigating these effects.

Copyright © 2011 by ASME

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