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CSME 2021/04
Volume 42 No.2
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209-217
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Simulation of Acoustically Induced Vibrations in a Gas Piping System by a Fluid—Structure Interaction Model
Abdullah Ahmed a, Mennatullah Ramadan a, Mayar Yasser a and Eslam Reda Lotfy a
aMechanical Engineering Department, Alexandria University, 21544 Alexandria, Egypt.
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Abstract:
The acoustically induced vibrations (AIV) are the vibrations of a piping system by the energy generated by a pressure-reducing device. Such vibrations can resonate with pipe shell vibrating modes. Recently, the capacities of the pressure reducing systems have been increased and some of the piping systems became susceptible to acoustic fatigue failures. In this paper, AIV damage was identified by dynamic stress evaluation at pipe discontinuities (welded connections). This evaluation was performed through a finite element analysis simulation of the fluid—structure coupling. Two types of pipe branching joints were examined for AIV stresses, namely the Weldolet and the Sweepolet. A maximum local stress of 300 MPa was recorded in the Weldolet joint at 1600 Hz excitation frequency, which is ten times the normal-operation stress. This is an indication of the importance of the AIV and the need to consider them at the design stage of the gas piping systems.
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Keywords: acoustically induced vibrations, fluid—structure interaction, finite element analysis, modal analysis, harmonic response analysis.
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*Corresponding author; e-mail: eslam.reda@alexu.edu.eg
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©
2021
CSME , ISSN 0257-9731
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