NONLINEAR RESPONSE OF PIPES CONVEYING FLUID WITH A BREATHING CRACK UNDER HARMONIC LOAD

9th Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise

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Field Value
 
Title NONLINEAR RESPONSE OF PIPES CONVEYING FLUID WITH A BREATHING CRACK UNDER HARMONIC LOAD
 
Creator Fengchun Cai; Nuclear Power Institute of China
Xianhui Ye; Nuclear Power Institute of China
Qian Huang; Nuclear Power Institute of China
Wenzheng Zhang; Nuclear Power Institute of China
 
Subject breathing crack; pipes conveying fluid; super-harmonic resonance; sub-harmonic resonance
 
Description Abstract: In this paper, the formula of local flexibility at crack location in pipes conveying fluid is established. According to the compatibility conditions of displacement, rotation angle, shear force and bending moment and the boundary conditions of the pipes, the mode shape functions of the cracked pipes were established. Then based on the Lagrange’s equation for a system containing non-material volumes, an equation of motion for pinned-pinned pipes conveying fluid with a breathing crack under harmonic load were derived. The equations of motion of the cracked pipe conveying fluid were discretized by the modal functions of cracked pipe, and the discrete equations of motion of the cracked pipe were obtained. The mass matrix, damping matrix, stiffness matrix varied with time due to opening and closing of the crack. Then numerical methods were used to solve the discrete equations and the dynamic response characteristics of the cracked pipe conveying fluid under harmonic excitation load were studied. the superharmonic resonance and sub-harmonic resonance could be shown when the pipes conveying fluid was under harmonic excitation load. In this paper, the influence of system parameters including crack depth, crack location, system damping and flow velocity on the harmonic components in the system response were investigated finally. and a ratio is used to describe the relative magnitude of each harmonic component in the response of cracked pipes conveying fluid. These results could provide a reference for crack identification for cracked pipes conveying fluid.
 
Publisher Paper Management System for FIV2018
 
Contributor
 
Date 2018-05-14 07:11:28
 
Type Peer-reviewed Paper
numerical; theoretical;
 
Format application/pdf
 
Identifier http://www.fiv2018.com/ocs/index.php/fiv2018/fivcan/paper/view/63
 
Source Paper Management System for FIV2018; FIV2018 Conference
 
Language en
 
Rights Authors who submit to this conference agree to the following terms:<br /> <strong>a)</strong> Authors retain copyright over their work, while allowing the conference to place this unpublished work under a <a href="http://creativecommons.org/licenses/by/3.0/">Creative Commons Attribution License</a>, which allows others to freely access, use, and share the work, with an acknowledgement of the work's authorship and its initial presentation at this conference.<br /> <strong>b)</strong> Authors are able to waive the terms of the CC license and enter into separate, additional contractual arrangements for the non-exclusive distribution and subsequent publication of this work (e.g., publish a revised version in a journal, post it to an institutional repository or publish it in a book), with an acknowledgement of its initial presentation at this conference.<br /> <strong>c)</strong> In addition, authors are encouraged to post and share their work online (e.g., in institutional repositories or on their website) at any point before and after the conference.
 

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