Spatial dynamics of tuned and mistuned bladed disks with cylindrical and wedge-shaped friction dampers

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Panning, Lars; Sextro, Walter; Popp, Karl: Spatial dynamics of tuned and mistuned bladed disks with cylindrical and wedge-shaped friction dampers. In: International Journal of Rotating Machinery 9 (2003), Nr. 3, S. 219-228. DOI:

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Sum total of downloads: 104

One of the main tasks in the design of turbomachines like turbines, compressors, and fans is to increase the reliability and efficiency of the arrangement. Failures due to blade cracks are still a problem and have to be minimized with respect to costs and safety aspects. To reduce the maximum stresses, the blades can be coupled via friction damping devices such as underplatform dampers that are pressed onto the blade platforms by centrifugal forces. In this work, a method will be presented to optimize two different types of underplatform dampers in bladed disk applications with respect to a maximum damping effect. In practice, underplatform dampers with various geometric properties—cylindrical and wedge-shaped—are commonly used and lead to different contact conditions. A discretization of the contact areas between the blade platforms and the dampers is applied to be able to investigate nearly arbitrary contact geometries and spatial blade vibrations. The functionality of the two mentioned damper types has been studied in detail under different working conditions of the assembly. The advantages and disadvantages of both damper types are pointed out and strategies are presented to improve the damper design. In this context, the influence of mistuning effects is discussed in terms of statistical mistuning of the blades’ natural frequencies due to manufacturing tolerances as well as systematical mistuning due to a deliberate slight variation of the blade masses or geometries.
License of this version: CC BY 3.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2003
Appears in Collections:Fakultät für Bauingenieurwesen und Geodäsie

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pos. country downloads
total perc.
1 image of flag of Germany Germany 60 57.69%
2 image of flag of China China 17 16.35%
3 image of flag of United States United States 14 13.46%
4 image of flag of No geo information available No geo information available 3 2.88%
5 image of flag of Nepal Nepal 2 1.92%
6 image of flag of Vietnam Vietnam 1 0.96%
7 image of flag of Taiwan Taiwan 1 0.96%
8 image of flag of Romania Romania 1 0.96%
9 image of flag of United Kingdom United Kingdom 1 0.96%
10 image of flag of Canada Canada 1 0.96%
    other countries 3 2.88%

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