Formation of spread in resonance stresses in bladed disks with non-identical blades and loose vibration conectedness

Abstract

The paper discusses the forced vibrations of mistunedbladed disks and loose vibration connectedness on the example of the model disk. It is shown that such wheels in separate frequency bands are losing the main features characteristic of systems with a small deviation from rotational symmetry. This leads to a qualitative change in the nature of their oscillations about the exciting harmonics. Otherwise becomes a mechanism for the formation of these scatter resonant stresses. It is found that the resulting vibrations in the bladed disks with a mistuning and loose vibration connectedness are a superposition of vibrations in several successively excited forms one family, the number of which may be up to a number of limited order of symmetry of the system occurring in the frequency range, depending on the accuracy of the blades.

About the authors

A. I. Ermakov

Samara State Aerospace University

Author for correspondence.
Email: fdla@ssau.ru

Doctor of Science (Engineering), Professor

Russian Federation

A. V. Urlapkin

Samara State Aerospace University

Email: urlapkin@gmail.com

Engineer of sectoral research laboratory "Vibration resistance and reliability of aeronautical products"

Russian Federation

D. G. Fedorchenko

Joint-Stock Company «Metallist-Samara», Samara

Email: metallist@metallist-s.ru

Candidate of Science (Engineering), Associate Professor

Chief designer

Russian Federation

References

  1. Ivanov V.P. Kolebaniya rabochikh koles turbomashin [Vibrations of Bladed Disks in Turbomachinery]. Moscow: Mashinostroenie Publ., 1983. 224 p.
  2. Tobias S.A., Arnold R.N. The influence of dynamical imperfection on the vibration of rotating disks // Proceedings of the Institution of the mechanical engineers, 1957. 30 p.
  3. Ermakov A.I., Urlapkin A.V., Fedorchenko D.G. Influence of vibration conectedness on eigenvalues of bladed disks with non-identical blades // Vestnik of the Samara State Aerospace University. 2014. No. 5(47), part 3. P. 77-82. (In Russ.) doi: 10.18287/1998-6629-2014-0-5-3(47)-76-81

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