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Research Papers: Gas Turbines: Structures and Dynamics

An Experimental Investigation of the Dynamics of a Blade With Two Under-Platform Dampers

[+] Author and Article Information
Daniele Botto

Department of Mechanical
and Aerospace Engineering,
Politecnico di Torino,
Corso Duca degli Abruzzi 24,
Torino 10129, Italy
e-mail: daniele.botto@polito.it

Chiara Gastadi

Department of Mechanical
and Aerospace Engineering,
Politecnico di Torino,
Corso Duca degli Abruzzi 24,
Torino 10129, Italy
e-mail: chiara.gastaldi@polito.it

Muzio M. Gola

Department of Mechanical
and Aerospace Engineering,
Politecnico di Torino,
Corso Duca degli Abruzzi 24,
Torino 10129, Italy
e-mail: muzio.gola@polito.it

Muhammad Umer

Department of Mechanical
and Aerospace Engineering,
Politecnico di Torino,
Corso Duca degli Abruzzi 24,
Torino 10129, Italy
e-mail: muhammad.umer@polito.it

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 13, 2017; final manuscript received July 20, 2017; published online October 17, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(3), 032504 (Oct 17, 2017) (9 pages) Paper No: GTP-17-1356; doi: 10.1115/1.4037865 History: Received July 13, 2017; Revised July 20, 2017

Several experimental apparatuses have been designed in the past to evaluate the effectiveness of under-platform dampers. Most of these experimental setups allow to measure the overall damper efficiency in terms of reduction of vibration amplitude in turbine blades. The experimental data collected with these test rigs do not increase the knowledge about the damper dynamics, and therefore, the uncertainty on the damper behavior remains a big issue. In this paper, a different approach to evaluate the damper–blade interaction has been put forward. A test rig has been purposely designed to accommodate a single blade and two under-platform dampers. One side of each damper is in contact with a ground support specifically designed to measure two independent forces on the damper. In this way, both the normal and the tangential force components in the damper–blade contact can be inferred. Damper kinematics is rebuilt by using the relative displacement measured between damper and blade. This paper describes the concept behind the new approach, shows the details of the new test rig, and discusses the blade frequency response from a new point of view.

FIGURES IN THIS ARTICLE
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Copyright © 2018 by ASME
Topics: Dampers , Blades , Kinematics
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References

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Figures

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Fig. 1

Overview of the test rig and details

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Fig. 2

View of the subassembly allowing the measurement of the contact forces. R11 and R13 are the forces measured by the load cells LC11 and LC13, respectively.

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Fig. 3

FRF for (a) the free blade without dampers and (b) with dampers loaded with CF = 4.6 kg, (b) different forcing levels |FE| have been investigated, and (c) measured and simulated hysteresis loops at the cylindrical side of the damper, corresponding to the working conditions highlighted in Fig. 3(b)

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Fig. 4

The test rig setup (a) with measured and applied forces, the laser setup (b) to record the blade platform in-plane motion, and the laser setup (c) to measure tangential relative displacement at the flat-on-flat and cylinder-on-flat contacts

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Fig. 5

Static equilibrium of the forces on the damper

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Fig. 6

(a) Comparison of FRF and (b) hysteresis loops at the damper cylindrical contact with different initial conditions, and (c) Damper force equilibrium; force scale shown in the figure. In the comparison, the dampers were loaded with CF = 4.6 kg, and the blade was excited with a force |FE| = 20 N.

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Fig. 7

Reconstruction of the in plane motion of the blade: (a) free blade with excitation force |FE| = 5 N, (b) damper loaded with CF = 4.6 kg and |FE| = 5 N, and (c) damper loaded with CF = 4.6 kg and |FE| = 100 N (c)

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Fig. 8

FRF of the blade-dampers system: (a) dampers loaded with CF = 2.6 kg and (b) dampers loaded with CF = 6.6 kg (b)

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Fig. 9

(a) Tangential over normal force ratio, (b) hysteresis loop at the cylinder-on-flat contact (excitation force |FE| = 100 N; dampers load CF = 4.6 kg), and (c) Comparison between the slopes of the hysteresis loops at the cylinder-on-flat contact obtained on two different and independent test rigs

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Fig. 10

Numerical model of the damper

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Fig. 11(a)

Measured and (b) simulated contact forces on the damper for CF = 4.6 kg and |FE| = 100 N

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