NDLI: Power Spectral Density Analysis of Acoustically Induced Vibration in Piping Systems

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ahmed, H. Dweib
Copyright Year	2012
Abstract	Acoustically induced vibration near points of large pressure reduction in piping systems can cause fatigue failure of the piping material at points of discontinuity. Empirical design curves have been used extensively for the assessment of acoustic fatigue risk level in piping systems. Subsequent development in the field resulted in the application of more detailed methods of analysis including, displacement-based and energy-based Finite Element Analysis (FEA) and Statistical Energy Analysis (SEA). Displacement-based FEA, which provides deterministic approach for the detailed analysis of the vibration response, is suitable for low and intermediate frequency range where the dynamic stresses in the pipe wall can be determined with reasonable certainty. For large complicated systems and high frequency range, the deterministic FEA becomes impractical due to the large number of mode shapes involved and the sensitivity of the results to small changes in system parameters. In these cases, the results of the FEA can have only a statistical value and SEA methods, which are based on statistical approach in contrast to deterministic approach, become more effective. SEA methods require accurate estimation of energy coupling parameters, on which the validity of the methods is dependent. In this paper, energy-based FEA is utilized for the evaluation of the system response and the SEA parameters. Power Spectral Density (PSD) analysis is performed for finite element model of a system consisting of pipe and acoustic fluid. The system is subjected to acoustically induced vibration through the input of acoustic energy at the downstream of a pressure-reducing valve. The system response is obtained and the parameters required for SEA, including the coupling power factor, are estimated.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	111
Ending Page	117
Page Count	7
File Format	PDF
ISBN	9780791855027
DOI	10.1115/PVP2012-78422
Volume Number	Volume 3: Design and Analysis
Conference Proceedings	ASME 2012 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2012-07-15
Publisher Place	Toronto, Ontario, Canada
Access Restriction	Subscribed
Subject Keyword	Vibration Seas Spectral energy distribution Certainty Fatigue Risk Valves Acoustics Fatigue failure Pressure Piping systems Displacement Stress Design Mode shapes Finite element model Fluids Finite element analysis Pipes
Content Type	Text
Resource Type	Article

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