The Basic Mechanisms of Turbine Dummy-Blades Assembly and Dry-Friction Dampers Interaction Experimental Investigation

Nikhamkin, Mikhail; Sazhenkov, N.A.; Семенова, И. В.; Semenov, S.

doi:10.4028/www.scientific.net/amm.752-753.346

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…Another common method is the introduction of dry friction damping, which contains shroud coupling, underplatform damper, lacing wire, snubber, ring damper, etc. [7][8][9][10]. Among them, the underplatform damper (UPD) has been more widely used due to its numerous advantages.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations on the Dynamic Response of Blades with Dual Friction Dampers

Man,

Xue,

Bian

et al. 2023

Aerospace

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Friction dampers are widely employed to reduce blade resonance vibration amplitude in turbomachinery. In this paper, a study was performed on the forced response of two blades with dual friction dampers. Numerical simulation and experimental testing were conducted. Firstly, the dynamics of the blade and dual friction damper system assembly are modeled. A nonlinear code based on the multi-harmonic balance method was developed to calculate the resonance response. In this analysis, both the blade and the damper are modeled with the finite element and the matrices reduced with the component mode synthesis method, while the contact forces are modeled with a one-dimensional variable normal load array element. Secondly, a test rig made of two blades and dual friction dampers, the material of which was steel, was established to measure the nonlinear frequency response function curves of the blade system. The results indicate that when a dual friction damper is applied, superior vibration reduction characteristics are demonstrated, with the system exhibiting an average 21% reduction in the response amplitude levels and an increase of 3% in the frequency shifting range compared to a single damper. Dampers positioned at relatively higher locations contribute significantly to the vibration reduction process. In the end, the numerical predictions match very well with the experimental ones.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations on the Dynamic Response of Blades with Dual Friction Dampers

Man,

Xue,

Bian

et al. 2023

Aerospace

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“…Other types of nonlinearities can exist such as geometric nonlinearities, material nonlinearities and aerodynamic forces, but they still remain less important than friction joints, especially for the applications to turbo-machinery [1]. The contact friction can result in a significant reduction in the global stiffness of the whole structure through the relative motion on the joint interface, which also introduces amplitude-dependent damping [11,16,19,28]. For an accurate prediction of the dynamic behavior of the assembly, the dynamics of the joint of interest must be captured accurately [6].…”

Section: Introductionmentioning

confidence: 99%

On an improved adaptive reduced-order model for the computation of steady-state vibrations in large-scale non-conservative systems with friction joints

et al. 2020

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Joints are commonly used in many largescale engineering systems to ease assembly, and ensure structural integrity and effective load transmission. Most joints are designed around friction interfaces, which can transmit large static forces, but tend to introduce stick-slip transition during vibrations, leading to a nonlinear dynamic system. Tools for the complex numerical prediction of such nonlinear systems are available today, but their use for large-scale applications is regularly prevented by high computational cost. To address this issue, a novel adaptive reduced-order model (ROM) has recently been developed, significantly decreasing the computational time for such high fidelity simulations. Although highly effective, significant improvements to the proposed approach is presented and demonstrated in this paper, further increasing the efficiency of the ROM. An energy-based error estimator was developed and integrated into the nonlinear spectral analysis, leading to a significantly higher computational speed by removing insignificant static modes from the stuck contact nodes in the original reduced basis, and improving the computational accuracy by eliminating numerical noise. The effectiveness of the new approach was shown on an industrial

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“…Then Zucca et al [25] used a rotating laser Doppler Vibrometer to measure the performance of under-platform dampers for turbine blades. Nikhamkin et al [26] developed an experimental technique for damping efficiency estimation of gas-turbine blades. The experimental investigation into the dynamic response of the blades of a gas turbine for power generation carrying asymmetric under-platform dampers was presented [27].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Simplified Turbine Blade Model with Under-Platform Dry Friction Dampers Considering Normal Load Variation

Ouyang

Ren

et al. 2017

Applied Sciences

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Dry friction dampers are widely used to reduce vibration. The forced vibration response of a simplified turbine blade with a new kind of under-platform dry friction dampers is studied in this paper. The model consists of a clamped blade as two rigidly connected beams and two dampers in the form of masses which are allowed to slide along the blade platform in the horizontal direction and vibrate with the blade platform in the vertical direction. The horizontal and vertical vibrations of the two dampers, and the horizontal and transverse platform vibrations are coupled by friction at the contact interfaces which is assumed to follow the classical discontinuous Coulomb's law of friction. The vertical motion of the dampers leads to time-varying contact forces and can cause horizontal stick-slip motion between the contact surfaces. Due to the relative horizontal motion between the dampers and the blade platform, the vertical contact forces and the resultant friction forces act as moving loads. The Finite Element (FE) method and Modal Superposition (MS) method are applied to solve the dynamic response, together with an algorithm that can capture nonsmooth transitions from stick to slip and slip to stick. Quasi-periodic vibration is found even under harmonic excitation.

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The Basic Mechanisms of Turbine Dummy-Blades Assembly and Dry-Friction Dampers Interaction Experimental Investigation

Cited by 4 publications

References 1 publication

Experimental and Numerical Investigations on the Dynamic Response of Blades with Dual Friction Dampers

Experimental and Numerical Investigations on the Dynamic Response of Blades with Dual Friction Dampers

On an improved adaptive reduced-order model for the computation of steady-state vibrations in large-scale non-conservative systems with friction joints

Dynamic Response of a Simplified Turbine Blade Model with Under-Platform Dry Friction Dampers Considering Normal Load Variation

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