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Adaptive control of...
Adaptive control of normal load at the friction interface of bladed disks using giant magnetostrictive material
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- Afzal, Mohammad, 1987- (författare)
- KTH,MWL Marcus Wallenberg Laboratoriet
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- Kari, Leif (författare)
- KTH,MWL Marcus Wallenberg Laboratoriet
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- Lopez Arteaga, Ines (författare)
- KTH,MWL Marcus Wallenberg Laboratoriet
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(creator_code:org_t)
- SAGE Publications, 2020
- 2020
- Engelska.
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Ingår i: Journal of Intelligent Materials Systems and Structures. - : SAGE Publications. - 1045-389X .- 1530-8138. ; 31:8, s. 1111-1125
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A novel application of magnetostrictive actuators in underplatform dampers of bladed disks is proposed for adaptive control of the normal load at the friction interface to achieve the desired friction damping in the structure. Friction damping in a bladed disk depends on operating parameters, such as rotational speed, engine excitation order, nodal diameter normal contact load, and contact interface parameters, such as contact stiffness and friction coefficient. The operating parameters have a fixed value, whereas the contact interface parameters vary in an unpredictable way at an operating point. However, the ability to vary some of these parameters such as the normal contact load in a controlled manner is desirable to attain an optimum damping in the bladed disk at different operating conditions. Under the influence of an external magnetic field, magnetostrictive materials develop an internal strain that can be exploited to vary the normal contact load at the friction interface, which makes them a potentially good candidate for this application. A commercially available magnetostrictive alloy, Terfenol-D is considered in this analysis that is capable of providing magnetostrain up to 2 × 10-3 under prestress and a blocked force over 1500 N. A linearized model of the magnetostrictive material, which is accurate enough for a direct current application, is employed to compute the output force of the actuator. A nonlinear finite element contact analysis is performed to compute the normal contact load between the blade platform and the underplatform damper as a result of magnetostrictive actuation. The nonlinear contact analysis is performed for different actuator mounting configurations and the obtained results are discussed. The proposed solution is potentially applicable to adaptively control vibratory stresses in bladed disks and consequently to reduce failure due to high-cycle fatigue. Finally, the practical challenges in employing magnetostrictive actuators in underplatform dampers are discussed.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
Nyckelord
- actuators
- bladed disk
- friction damping
- Giant magnetostrictive material
- high-cycle fatigue
- Terfenol-D
- Actuator disks
- Adaptive control systems
- Damping
- Friction
- Interfaces (materials)
- Loads (forces)
- Magnetostrictive devices
- Rare earth alloys
- Turbomachine blades
- Giant magnetostrictive materials
- High cycle fatigue
- Fatigue of materials
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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