Extension of Modal Analysis Results to the Operational Behavior of High-Vulnerability Piping at the Cernavodă Nuclear Power Plant
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Abstract
The present work examines the influence of turbulent flow in pipeline systems at various fluid (water) flow rates, with an emphasis on the vibrations induced by this flow and the potential occurrence of resonance phenomena in specific sections of the pipe. To conclude, the study considers the Vortex-Induced Vibration (VIV) mechanism, associated with the periodic shedding of vortices in regions featuring geometric discontinuities such as elbows, tees, valves, reducers, and compares it with the natural vibration modes of the investigated system.
A structural modal analysis of the piping system is conducted using AutoPIPE to identify the natural vibration modes and corresponding participation factors. Flow-induced excitation frequencies associated with internal fittings are estimated using Strouhal-based correlations under representative operating conditions. The proximity between excitation frequencies and structural natural frequencies is quantitatively assessed to identify vibration modes potentially prone to resonance.
The results indicate that the first three and 11th vibration modes exhibit the greatest dynamic interaction influence under potential excitations. The proposed approach provides a practical, operational screening methodology for identifying vibration-resonance scenarios in existing piping systems.
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