Effect of Non-Uniform Blade Root Friction and Sticking on Disk Stresses

Simmons, Harold R.; Iyengar, Vishwas

doi:10.1115/gt2011-46689

Cited by 3 publications

(3 citation statements)

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“…Three different dovetail root geometries characterized by different slope of the contact interfaces are tested. In [6] the same method is applied to contiguous blades to study the elastic strain generated close to the lobes of the fir tree geometry of the slot to study the stress distribution that can be locally enhanced by the presence of the typical notch factors due to the geometry of the root.…”

Section: Introductionmentioning

confidence: 99%

“…The second type of experimental tests can be considered as large-scale or component-scale investigation since the mechanical assembly including one or more contact interfaces is fully or partially tested in order to obtain a database of experimental measurements to validate the numerical code where the contact model is implemented and applied to a specific kind of joint. For this reason extensive research has been done into the blade-disk joint experimentally [4][5][6]. The effect of these joints on the dynamics of the vibrating system is usually measured in terms of peak amplitude variation and peak frequency shift, by investigating the effect of the main systems parameters such as the blade pulling load and the excitation amplitude due, in the actual operative conditions, respectively to the angular velocity of the turbine and the unsteady aerodynamic forces applied to the blade airfoil.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on the Damping Effectiveness of Blade Root Joints

Firrone

Bertino

2015

Exp Mech

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The mechanical design of turbine blades aims at verifying the structural integrity against High Cycle Fatigue damage. For this reason Forced Responses are simulated in order to evaluate the distribution of variable stress in the blade. When resonant excitation can not be avoided in service, the mechanical damping is enhanced to reduce blade vibrations by the design of friction joints which dissipate energy by the slip of the contact surfaces. In this paper a test campaign is presented in order to collect a database of the nonlinear Frequency Response Functions (FRF) of a dummy blade by varying the normal contact load and the amount of excitation of the system. Two different geometries of blade root joints are tested: the dovetail and the crowned joint. Commissioning of the exciter and of the measurement system is described and discussed in order to define the fastest and most reliable FRF measurement.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Damping Effectiveness of Blade Root Joints

Firrone

Bertino

2015

Exp Mech

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“…Asai [11] analyzed the behavior of cantilever beam root nodes with different geometries and evaluated the corresponding friction damping in the system. Simmons [12] used the same method to study the stress distribution in blade dampers for adjacent blades. Umer [13] evaluated the overall dynamic behavior of the contact between the damper and the blade under a platform, and studied the local contact behavior of the damper under the platform, thus summarizing the performance curves of these damping structures.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Nonlinear Vibration in Compressor Stator Blade with Holding Ring Structure Considering Contact Friction

Liu

Xie

et al. 2023

Applied Sciences

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At present, there are very few vibration test designs for compressor stator blades in damped blade test research, and there is a lack of consideration of the holding ring structure of the blade installation. In recent years, compressor designs have become more elaborate, and their structures have become more compact. For improving compressor stator blade design, it is necessary to study the blade vibration response considering contact and friction. In this paper, a compressor stator blade vibration test system with a holding ring structure is designed and built. The composition of the system and the flow of vibration are tested. Then, the nonlinear vibration rules of the model stator blades are experimentally studied through the built test bench. The experimental conditions include excitation forces of 1 N, 2 N, 3 N and 4 N, respectively. At the same time, the normal load of the outer holding ring and the blade contact surface includes 10 N, 20 N, 30 N and 40 N working conditions. The nonlinear vibration law of the test model blade considering contact friction is analyzed using a numerical method and experimental data. The experimental data agree well with the numerical analysis results, and the relative error of measurement is basically less than 5%. It is concluded that the damping vibration rule of the test model blade is related to the exciting force applied by the exciter and the contact surface normal load applied by the adjusting bolt. When these two parameters change, the movement behavior of the contact surface will switch between macro-slip, fretting slip and even a viscous state. Therefore, the amplitude of the blade will change and show nonlinear vibration characteristics. The experimental data in this paper can provide a reference for research on stator ring vibration safety in compressors.

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Experimental and Numerical Investigation of Contact Parameters in a Dovetail Type of Blade Root Joints

Dastani¹,

Botto²,

Glorioso³

2021

Applied Sciences

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This paper focuses on the contact characteristics of the blade root joints subjected to the dry friction damping under periodic excitation. The numerical method and experimental procedure are combined to trace the contact behavior in the nonlinear vibration conditions. In experimental procedure, a novel excitation method alongside the accurate measurements is used to determine the frequencies of the blade under different axial loads. In numerical simulations, local behavior of contact areas is investigated using the reduction method as a reliable and fast solver. Subsequently, by using both experimental measurements and numerical outcomes in a developed code, the global stiffness matrix is calculated. This leads to find the normal and tangential stiffness in the contact areas of a dovetail blade root joints. The results indicate that the proposed method can provide an accurate quantitative assessment for investigation the dynamic response of the joints with focusing the contact areas.

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Effect of Non-Uniform Blade Root Friction and Sticking on Disk Stresses

Cited by 3 publications

References 0 publications

Experimental Investigation on the Damping Effectiveness of Blade Root Joints

Experimental Investigation on the Damping Effectiveness of Blade Root Joints

Experimental and Numerical Study of Nonlinear Vibration in Compressor Stator Blade with Holding Ring Structure Considering Contact Friction

Experimental and Numerical Investigation of Contact Parameters in a Dovetail Type of Blade Root Joints

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