Finite element analysis of fluid-structure interaction in piping systems

Cao, D

Finite element analysis of fluid-structure interaction in piping systems

Cao, D

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Publication Type:: Thesis
Issue Date:: 2015

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Field	Value	Language
dc.contributor.author	Cao, D
dc.date.accessioned	2015-09-02T01:02:54Z
dc.date.available	2015-09-02T01:02:54Z
dc.date.issued	2015
dc.identifier.uri	http://hdl.handle.net/10453/37021
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_US
dc.description.abstract	As a typical fluid-structure interaction (FSI) system, the fluid-filled pipe widely used in industry is investigated in this thesis. It is concerned with two kinds of coupled vibration analysis, in the case of a fluid-filled pipe rigidly bonded to a steel-frame structure at a number of fixed points. One is the fluid-structure interaction analysis in the fluid-filled pipe system while the other is the structural coupling analysis between the pipe and the steel support. Considering the pipe and the steel support as two subsystems, due to the existence of these bonding points, the vibration of one subsystem will force the other to create a new particular vibration pattern. Thus a finite element approach is presented to combine the dynamic models of two subsystems to obtain the natural frequencies and mode shapes of the whole system. The discretised finite element equation describing the free vibration of the system is deduced in a displacement-pressure format. In order to process both unsymmetrical mass and stiffness matrices due to the FSI coupling, an iterative numerical method is applied to solve the generalized eigenvalue problem and therefore the natural frequencies and model shapes of the coupled system could be obtained. In order to save computation time for modal analysis, the number of degrees of freedom of the full model is significantly reduced by employing dynamic condensation method. Numerical examples are given to verify the feasibility of the calculation method. The obtained computational natural frequencies are compared with those obtained from experiment. Different parameters influencing the coupled vibration are discussed as well and these results could provide theoretical foundation for the optimization design of structure-fluid coupled systems such as hydraulically interconnected suspensions fluid-filled pipe systems for vehicle braking, etc.	en_US
dc.format	Thesis (ME)	en_US
dc.language.iso	en	en_US
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/37021/2/02whole.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	au.edu.uts.lib/ppc
dc.title	Finite element analysis of fluid-structure interaction in piping systems	en_US
dc.type	Thesis
utslib.copyright.status	open_access

Abstract:

As a typical fluid-structure interaction (FSI) system, the fluid-filled pipe widely used in industry is investigated in this thesis. It is concerned with two kinds of coupled vibration analysis, in the case of a fluid-filled pipe rigidly bonded to a steel-frame structure at a number of fixed points. One is the fluid-structure interaction analysis in the fluid-filled pipe system while the other is the structural coupling analysis between the pipe and the steel support. Considering the pipe and the steel support as two subsystems, due to the existence of these bonding points, the vibration of one subsystem will force the other to create a new particular vibration pattern. Thus a finite element approach is presented to combine the dynamic models of two subsystems to obtain the natural frequencies and mode shapes of the whole system. The discretised finite element equation describing the free vibration of the system is deduced in a displacement-pressure format. In order to process both unsymmetrical mass and stiffness matrices due to the FSI coupling, an iterative numerical method is applied to solve the generalized eigenvalue problem and therefore the natural frequencies and model shapes of the coupled system could be obtained. In order to save computation time for modal analysis, the number of degrees of freedom of the full model is significantly reduced by employing dynamic condensation method. Numerical examples are given to verify the feasibility of the calculation method. The obtained computational natural frequencies are compared with those obtained from experiment. Different parameters influencing the coupled vibration are discussed as well and these results could provide theoretical foundation for the optimization design of structure-fluid coupled systems such as hydraulically interconnected suspensions fluid-filled pipe systems for vehicle braking, etc.

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