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Research Papers: Fluid-Structure Interaction

Mass, Stiffness, and Damping Identification for a Pressurized Water Reactors Fuel Assembly by a Proper Orthogonal Decomposition Method

[+] Author and Article Information
G. Ricciardi

CEA Cadarache DEN/DTN/STRI/LHC,
Saint Paul-Lez-Durance Cedex 13108, France
e-mail: guillaume.ricciardi@cea.fr

E. Boccaccio

CEA Cadarache DEN/DTN/STRI/LHC,
Saint Paul-Lez-Durance Cedex 13108, France

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 4, 2013; final manuscript received September 9, 2014; published online October 14, 2014. Assoc. Editor: Chong-Shien Tsai.

J. Pressure Vessel Technol 136(6), 061303 (Oct 14, 2014) (9 pages) Paper No: PVT-13-1107; doi: 10.1115/1.4028559 History: Received July 04, 2013; Revised September 09, 2014

In this paper, dynamic tests of a fuel assembly subjected to an axial flow are presented. Tests are performed for various flow conditions, at several displacement amplitudes. The first four modes of the fuel assembly are excited, two confinements are tested. A parameters identification method based on a proper orthogonal decomposition (POD) analysis is proposed. Mass, damping, and stiffness parameters are presented for different displacement amplitudes and flow rates. An added mass effect in still water is observed, and the damping increases linearly with the flow rate. A nonlinear behavior of the fuel assembly is observed. An added stiffness effect increasing with the flow rate is observed, and the mass seems to depend on the flow rate. The by-pass seems to be responsible for these observations.

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References

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Païdoussis, M. P., 2003, Fluid-Structure Interactions: Slender Structures and Axial Flow, Vol. 2, Elsevier Academic, London, UK.
Ricciardi, G., Bellizzi, S., Collard, B., and Cochelin, B., 2009, “Modelling Pressurized Water Reactor Cores in Terms of Porous Media,” J. Fluids Struct., 25(1), pp. 112–133. [CrossRef]
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Ricciardi, G., and Boccaccio, E., 2012, “Stiffening of a Fuel Assembly Under Axial Flow,” Proceedings of the 10th International Conference on Flow-Induced Vibration (& Flow-Induced Noise)—FIV2012, Dublin, Ireland, 2–6 July, pp. 391–397.
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Figures

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Fig. 1

Confinements configurations

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Fig. 2

Hydraulic actuator positions for two configurations

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Fig. 3

Response of the fuel assembly to a displacement of 1 mm imposed on grid 7; displacement of grid 5 (up), displacement of grid 7 (middle), and force applied on grid 7 (down)

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Fig. 4

First modes shapes obtained with the POD method for DEDALE 1, DEDALE 2, and DEDALE 3, and under different flow conditions

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Fig. 5

Modes shapes obtained with the POD method under different flow conditions

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Fig. 6

Frequency evolution of modes in a DEDALE 2 test (left) and a DEDALE 3 test (right)

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Fig. 7

Mass identified with the one degree of freedom method (left) and the POD method (right)

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Fig. 8

Mass identified with the POD method versus amplitude under different flow conditions and for the first mode

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Fig. 9

Mass identified with the POD method versus amplitude for the first four modes in still water

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Fig. 10

Mass identified with the POD method versus flow rate (−1 stands for air case) for the first four modes and for 5 mm amplitude

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Fig. 11

Damping coefficient identified with the POD method versus amplitude under different flow conditions and for the first mode

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Fig. 12

Damping coefficient identified with the POD method versus amplitude for the first four modes in still water

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Fig. 13

Damping coefficient identified with the POD method versus flow rate (−1 stands for air case) for several amplitudes and for the first mode

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Fig. 14

Stiffness identified with the POD method versus amplitude under different flow conditions and for the first mode

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Fig. 15

Stiffness identified with the POD method versus amplitude for the first four modes in still water and under 5 m/s flow rate

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Fig. 16

Stiffness identified with the POD method versus flow rate (−1 stands for air case) for several amplitudes and for the first mode

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Fig. 17

DEDALE 1-DEDALE 2 comparison in still water and under 5 m/s flow of mass (up), damping (middle), and stiffness (down)

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Fig. 18

Modes identified frequencies versus displacement amplitude (left) and versus flow rate (−1 stands for the air case) (right)

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