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Frequency-dependent damping model for the hydroacoustic finite element analysis of fluid-filled pipes with diameter changes
Publikationstyp
Journal Article
Date Issued
2011
Sprache
English
Author(s)
Herrmann, Jan
Maess, Matthias
Volume
25
Issue
3
Start Page
981
End Page
990
Citation
Mechanical Systems and Signal Processing 25 (3): 981-990 (2011)
Publisher DOI
Scopus ID
Publisher
Elsevier
The integration of a model for longitudinal hydroacoustic fluid damping in thin hydraulic pipes in 3D finite element models is presented in this paper. In order to perform quantitative prediction of the vibroacoustic behavior and resulting noise levels of such fluidstructure coupled system due to hydraulic excitation, an accurate frequency-dependent fluid damping model including friction effects near the pipe wall is required. This step is achieved by matching complex wave numbers from analytical derivation into a parameterized damped wave equation and consecutive translation into finite element modeling. Since the friction effect close to the pipe wall changes locally with the inner pipe radius, the fluid damping model is applied segment-wise in order to model the influence of cross-sectional discontinuity, such as orifices, on the oscillating pressure pulsations. A component synthesis approach, which uses pipe segments as substructures, allows a simple model generation and fast computation times. The numerical harmonic results are compared to experimental frequency response functions, which are performed on a hydraulic test bench driven by a dynamic pressure source in the kHz-range.
Subjects
Acoustic fluidstructure interaction
Complex circular wave number
FEM
Fluid damping
Fluid-filled pipes
Substructuring
DDC Class
530: Physics
510: Mathematics