Non-planar vibrations of beams with geometric imperfections and hysteretic boundary conditions

Article Engineering, Mechanical

Nonlinear vibrations of beams with Bouc-Wen hysteretic boundary conditions

Brian Painter et al.

Summary: In pressurized water reactors, accurate modeling of fuel rod dynamics is crucial to prevent excessive wear caused by turbulent fluid forces. The use of spacer grids with specific design to restrain the fuel rod and generate nonlinear boundary conditions can lead to complex dynamic responses. Experimental studies on nonlinear vibration of fuel rods supported by spacer grids have demonstrated good agreement between model predictions and actual results.

NONLINEAR DYNAMICS (2022)

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Article Nuclear Science & Technology

Experiments on the localized interaction at the interface fuel rod/spacer grid in pressurized water reactors

Giovanni Ferrari et al.

Summary: This discussion focuses on the fretting phenomenon between fuel rods and spacer grids in the operation of Pressurized Water Reactors (PWRs) and its impact on safety and financial losses. Friction caused by fretting can result in fission byproducts entering the primary coolant circuit, compromising the integrity of fuel rods. Experimental measurements of contact force and axial slip during Flow-Induced Vibrations (FIV) reveal the wear mechanisms induced by fuel rod vibrations.

NUCLEAR ENGINEERING AND DESIGN (2022)

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Article Acoustics

Nonlinear vibrations of beams with bilinear hysteresis at supports: interpretation of experimental results

Prabakaran Balasubramanian et al.

Summary: The experimental vibration responses of beams with nonlinear boundary conditions were interpreted using a bilinear spring model. It was found that the boundary conditions transitioned from rotational linear stiffness at low vibration amplitudes to bilinear stiffness with hysteresis at higher amplitudes. The model accurately reproduced the experimental results without the need for parameter adjustment at different excitation levels.

JOURNAL OF SOUND AND VIBRATION (2021)

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Article Nuclear Science & Technology