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Numerical analysis ...
Numerical analysis of multiple friction contacts in bladed disks
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- Afzal, Mohammad, 1987- (författare)
- KTH,MWL Marcus Wallenberg Laboratoriet
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- Lopez-Arteaga, Ines (författare)
- KTH,MWL Marcus Wallenberg Laboratoriet,Eindhoven University of Technology
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- Kari, Leif (författare)
- KTH,MWL Marcus Wallenberg Laboratoriet
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(creator_code:org_t)
- Engelska.
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Ingår i: International Journal of Mechanical Sciences. - 0020-7403 .- 1879-2162.
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- The damping potential of multiple friction contacts in a bladed disk, tip shroud and strip damper is investigated, showing that friction damping effectiveness can be potentially increased by using multiple friction contact interfaces. Friction damping depends on many parameters such as rotational speed, engine excitation order and mode family and therefore it is not possible to damp all the critical resonances using a single friction contact interface. For example, a strip damper is more effective for the low nodal diameters, where blade/disk coupling is strong. The equations of motion of the bladed disk with multiple friction contacts are derived in the frequency domain for a cyclic structure with rotating excitations and a highly accurate method is used to generate the frequency response function (FRF) matrix. Furthermore, a finite element contact analysis is performed to compute the normal contact load and the contact area of the shroud interface at operating rotational speed. The multiharmonic balance method is employed in combination with the alternate frequency time domain method to find the approximate steady state periodic solution. A low-pressure turbine bladed disk is considered and the effect of the engine excitation level, strip mass, thickness and the accuracy of FRF matrix on the nonlinear response curve are investigated in detail.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
Nyckelord
- Friction damping
- Shroud contact
- Strip damper
- Cyclic symmetry
- Alternate frequency time domain method
- Multiharmonic balance method.
- Engineering Mechanics
- Teknisk mekanik
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