Experimental and Numerical Investigation of Rotating Bladed Disk Forced Response Using Underplatform Friction Dampers

Sever, Ibrahim A.; Petrov, E. P.; Ewins, D. J.

doi:10.1115/1.2903845

Cited by 50 publications

(20 citation statements)

References 15 publications

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“…Several studies on friction damping in bladed disks have been presented in the literature. Most of these focus on friction damping in bladed disks assemblies [2,6,12,14]: under-platform dampers, shrouds, blade-root damping,. .…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations of Friction Rings Damping of Blisks

Laxalde

Gibert

Thouverez

2008

Volume 5: Structures and Dynamics, Parts a and B

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The use of friction ring dampers for integrally bladed disks (blisks) is investigated numerically and experimentally in this paper. A test rig was developed and consists in an industrial HP compressor blisk rotating inside a vacuum chamber. Excitation is produced through piezoelectric actuators and measured data are obtained from strain gauges. Non-linear resonance curves obtained by stepped sine tests are studied. Interesting phenomena on the behaviour of this damping technology are obtained experimentally. Parametric studies on the influence of the rotation speed or of the excitation level are also presented. A non-linear modal identification method is used in order to extract the modal parameters from the resonance curves. Then a comparison of these experimental results to the results of numerical simulations is proposed. The numerical methods is based on a frequency domain formulation of the system's dynamics; a non-linear modal approach is used. The correlation between the experiments and the predicted results are in quite good agreement given the complexity and the variability of the system and phenomena.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations of Friction Rings Damping of Blisks

Laxalde

Gibert

Thouverez

2008

Volume 5: Structures and Dynamics, Parts a and B

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“…In recent developments [34,35], a specific test rig was designed to measure the forces transmitted between the damper and the platform, as well as the relative displacements, allowing a fine tuning of the contact parameters when compared to the simulations. More realistic set ups have been proposed [36,37], but they tend to introduce additional complications such as uncertainties about the damper position during operation, and mistuning due to the bladed disk manufacturing tolerances. The asymmetry of the excitation system used in the double beam configuration could lead to potential mistuning as well, but with the damper in place, no double peak response was observed for the analysed modes.…”

Section: Rig Concept and Non-dimensional Parametersmentioning

confidence: 99%

“…Two pseudo beam-like blades are fixed on a common base, which simulates a rigid disk. For this investigation, the damper is a wedge-type, [36], which has a triangular cross section with a characteristic angle. Unlike in a real high-pressure turbine blade, the aerofoil is substituted by a straight rectangular cross-section beam.…”

Section: Rig Concept and Non-dimensional Parametersmentioning

confidence: 99%

Modelling the nonlinear behaviour of an underplatform damper test rig for turbine applications

Pesaresi

Salles

Jones

et al. 2017

Mechanical Systems and Signal Processing

141

108

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Underplatform dampers (UPD) are commonly used in aircraft engines to mitigate the risk of high-cycle fatigue failure of turbine blades. The energy dissipated at the friction contact interface of the damper reduces the vibration amplitude significantly, and the couplings of the blades can also lead to significant shifts of the resonance frequencies of the bladed disk. The highly nonlinear behaviour of bladed disks constrained by UPDs requires an advanced modelling approach to ensure that the correct damper geometry is selected during the design of the turbine, and that no unexpected resonance frequencies and amplitudes will occur in operation. Approaches based on an explicit model of the damper in combination with multi-harmonic balance solvers have emerged as a promising way to predict the nonlinear behaviour of UPDs correctly, however rigorous experimental validations are required before approaches of this type can be used with confidence.In this study, a nonlinear analysis based on an updated explicit damper model having different levels of detail is performed, and the results are evaluated against a newly-developed UPD test rig. Detailed linear finite element models are used as input for the nonlinear analysis, allowing the inclusion of damper flexibility and inertia effects. The nonlinear friction interface between the blades and the damper is described with a dense grid of 3D friction contact elements which allow accurate capturing of the underlying nonlinear mechanism that drives the global nonlinear behaviour. The introduced explicit damper model showed a great dependence on the correct contact pressure distribution. The use of an accurate, measurement based, distribution, better matched the nonlinear dynamic behaviour of the test rig. Good agreement with the measured frequency response data could only be reached when the zero harmonic term (constant term) was included in the multi-harmonic expansion of the nonlinear problem, highlighting its importance when the contact interface experiences large normal load variation. The resulting numerical damper kinematics with strong translational and rotational motion, and the global blades frequency response were fully validated experimentally, showing the accuracy of the suggested high detailed explicit UPD modelling approach.

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“…A single-harmonic balance approach [25] was considered for this study, but it was found to be unable to capture the complex behavior occurring at the interface [59,60]. Therefore a multi-harmonic balance solver, which forms part of the software code, FORSE (Forced Response Suite) [37][38][39], developed at Imperial College London for industrial scale use [44,61], was used.…”

Section: Mathematical Backgroundmentioning

confidence: 99%

Nonlinear modeling of structures with bolted joints: A comparison of two approaches based on a time-domain and frequency-domain solver

Lacayo

Pesaresi

Groß

et al. 2019

Mechanical Systems and Signal Processing

121

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Motivated by the current demands in high-performance structural analysis, and by a need to better model systems with localized nonlinearities, analysts have developed a number of different approaches for modeling and simulating the dynamics of a bolted-joint structure. However, it is still unclear which approach might be most effective for a given system or set of conditions. To better grasp their similarities and differences, this paper presents a numerical benchmark that assesses how well two diametrically differing joint modeling approaches -a time-domain wholejoint approach and a frequency-domain node-to-node approach -predict and simulate a mechanical joint. These approaches were applied to model the Brake-Reuß beam, a prismatic structure comprised of two beams with a bolted joint interface. The two approaches were validated first by updating the models to reproduce the nonlinear response for the first bending mode of an experimental Brake-Reuß beam. Afterwards, the tuned models were evaluated on their ability to predict the nonlinearity in the dynamic response for the second and third bending modes. The results show that the two joint modeling approaches perform about equally as well in simulating the Brake-Reuß beam. In addition, the exposition highlights improvements that were made in each method during the course of this work and reveal further challenges in advancing the state-of-the-art.

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Experimental and Numerical Investigation of Rotating Bladed Disk Forced Response Using Underplatform Friction Dampers

Cited by 50 publications

References 15 publications

Experimental and Numerical Investigations of Friction Rings Damping of Blisks

Experimental and Numerical Investigations of Friction Rings Damping of Blisks

Modelling the nonlinear behaviour of an underplatform damper test rig for turbine applications

Nonlinear modeling of structures with bolted joints: A comparison of two approaches based on a time-domain and frequency-domain solver

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