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Simulation of Vibro–Acoustics in Flexible Piping Systems
Author(s) -
Maess Matthias,
Gaul Lothar
Publication year - 2005
Publication title -
gamm‐mitteilungen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.239
H-Index - 18
eISSN - 1522-2608
pISSN - 0936-7195
DOI - 10.1002/gamm.201490011
Subject(s) - observability , piping , acoustics , excitation , physics , controllability , structural acoustics , modal , reduction (mathematics) , mechanics , computer science , vibration , mathematics , materials science , geometry , quantum mechanics , polymer chemistry , thermodynamics
Pump ßuctuation and valve action in piping systems can lead to undesired excitation of structural components by propagating sound waves in the ßuid path. This vibro–acoustic problem is addressed by studying the dynamics as well as excitation mechanism. It is found that internal ßuid ßow does neither alter operational deßections nor vibrational modes considerably for low Mach numbers as encountered in most piping systems conveying heavy ßuids. Therefore, the ßuid is modelled at rest to solve the vibro–acoustic problem. On the other hand ßuid–structure interaction has a significant inßuence and cannot be neglected. Pipe models are generated in three dimensions by using Finite Elements. The acoustic wave equation in the ßuid is hereby fully coupled to the structural domain at the ßuid‐structure interface. These models are used for simulating mode excitation by transient simulation and modal analysis. Reduced component models allow for efficient simulations. The model reduction is hereby based on a modal truncation. Afterwards, dominant modes are selected based on controllability and observability considerations. Modal controllabilities are furthermore used to quantify the excitation of vibrational modes by white noise at the pipe inlet. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)