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INVESTIGATION OF DAMPING POTENTIAL OF STRIP DAMPER ON A REAL TURBINE BLADE
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0003-4237-2630
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-3609-3005
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, Superseded Departments, Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-5760-3919
2016 (English)In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2016, VOL 7A, AMER SOC MECHANICAL ENGINEERS , 2016Conference paper (Refereed)
Abstract [en]

This paper investigates the damping potential of strip dampers on a real turbine bladed disk. A 3D numerical friction contact model is used to compute the contact forces by means of the Alternate Frequency Time domain method. The Jacobian matrix required during the iterative solution is computed in parallel with the contact forces, by a quasi-analytical method. A finite element model of the strip dampers, that allows for an accurate description of their dynamic properties, is included in the steady-state forced response analysis of the bladed disk. Cyclic symmetry boundary conditions and the multiharmonic balance method are applied in the formulation of the equations of motion in the frequency domain. The nonlinear forced response analysis is performed with two different types of boundary conditions on the strip: (a) free-five and (b) elastic, and their influence is analyzed. The effect of the strip mass, thickness and the excitation levels on the forced response curve is investigated in detail.

Place, publisher, year, edition, pages
AMER SOC MECHANICAL ENGINEERS , 2016.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-196479ISI: 000385461600052ScopusID: 2-s2.0-84991693685OAI: oai:DiVA.org:kth-196479DiVA: diva2:1049389
Conference
ASME Turbo Expo: Turbine Technical Conference and Exposition
Note

QC 20161124

Available from: 2016-11-24 Created: 2016-11-14 Last updated: 2017-03-10Bibliographically approved
In thesis
1. On efficient and adaptive modelling of friction damping in bladed disks
Open this publication in new window or tab >>On efficient and adaptive modelling of friction damping in bladed disks
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This work focuses on efficient modelling and adaptive control of friction damping in bladed disks. To efficiently simulate the friction contact, a full-3D time-discrete contact model is reformulated and an analytical expression for the Jacobian matrix is derived that reduces the computation time drastically with respect to the classical finite difference method. The developed numerical solver is applied on bladed disks with shroud contact and the advantage of full-3D contact model compared to a quasi-3D contact model is presented. The developed numerical solver is also applied on bladed disks with strip damper and multiple friction contacts and obtained results are discussed. Furthermore, presence of higher harmonics in the nonlinear contact forces is analyzed and their effect on the excitation of the different nodal diameters of the bladed disk are systematically presented. The main parameters that influence the effectiveness of friction damping in bladed disks are engine excitation order,  contact stiffnesses,  friction coefficient, relative motion at the friction interface and the normal contact load. Due to variation in these parameters during operation, the obtained friction damping in practice may differ from the optimum value. Therefore, to control the normal load adaptively that will lead to an optimum damping in the system despite these variations, use of magnetostrictive actuator is proposed. The magnetostrictive material that develops an internal strain under the influence of an external magnetic field is employed to increase and decrease the normal contact load. A linearized model of the magnetostrictive actuator is used to characterize the magnetoelastic behavior of the actuator.  A nonlinear static contact analysis of the bladed disk reveals that a change of normal load more than 700 N can be achieved using a reasonable size of the actuator. This will give a very good control on friction damping once applied in practice.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 70 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2017:10
Keyword
High cycle fatigue, Friction contact, Jacobian matrix, Shroud contact, Strip damper, Multiharmonic balance method, Contact stiffness, Cyclic symmetry, Nodal diameter, Magnetostrictive actuator, Magnetic field
National Category
Applied Mechanics Energy Engineering
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-202978 (URN)978-91-7729-292-0 (ISBN)
Public defence
2017-04-12, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
TurboPower
Funder
Swedish Energy Agency, 26159
Note

QC 20170310

Available from: 2017-03-13 Created: 2017-03-10 Last updated: 2017-03-13Bibliographically approved

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