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Effect of axial force, unbalance and coupling misalignment on vibration of a rotor gas turbine

Askarian, A ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. Publisher: 2007
  3. Abstract:
  4. Unbalanced rotors and shaft misalignment are the two main sources of vibration in rotating machinery. These undesired vibrations may destroy critical parts of the machine, such as bearings, gears and couplings. There are lots of investigations about effect of unbalance and coupling misalignment upon the critical speeds and vibration amplitudes in rotary machinery. In this paper, effect of various parameters such as rotational velocity, geometry, variation of temperature and Poisson ratio on the natural frequency of rotating shafts were investigated. The equation of motion was derived from Euler-Bernoulli beam model and strain-stress relations. Results show that the effect of spin softening is more important than axial force. For investigation of unbalance and misalignment response in a multirotor system, FEM is used. The spline coupling was modelled in the form of bending spring. The equation of motion is solved by Newmark scheme. Results show that unbalance and misalignment are important in domain of first and second natural frequency, respectively
  5. Keywords:
  6. Coupling misalignment ; Equation of motion ; Euler-Bernoulli beam models ; Multi-rotor system ; Rotational velocity ; Shaft misalignment ; Spline couplings ; Vibration amplitude ; Axial flow ; Bearings (machine parts) ; Equations of motion ; Natural frequencies ; Rotating machinery ; Alignment
  7. Source: 14th International Congress on Sound and Vibration 2007, ICSV 2007, Cairns, QLD, 9 July 2007 through 12 July 2007 ; Volume 3 , 2007 , Pages 2070-2077 ; 9781627480000 (ISBN)
  8. URL: https://docplayer.net/219230954-Effect-of-axial-force-unbalance-and-coupling-misalignment-on-vibration-of-a-rotor-gas-turbine-abdolreza-askarian-1-s-m.html