The influence of stiffening ribs on the natural frequencies of butterfly valve disks

In this paper a study regarding the influence of the ribs shape on the dynamic behavior of butterfly valves, in terms of natural frequency variation, is presented. This behavior is important because the valve disk vibrates due to fluid flow when it is fully or partially open. If the disk is "lo...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2017-01, Vol.163 (1), p.12041
Main Authors: Ursoniu, C, Pepa, D, Tufoi, M, Gillich, G R
Format: Article
Language:English
Subjects:
Butterfly valves
Disks
Finite element method
Fluid dynamics
Fluid flow
Frequency variation
Modal analysis
Resonant frequencies
Stiffening
Stiffness
Vortex shedding
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Summary:In this paper a study regarding the influence of the ribs shape on the dynamic behavior of butterfly valves, in terms of natural frequency variation, is presented. This behavior is important because the valve disk vibrates due to fluid flow when it is fully or partially open. If the disk is "locked in", which means that frequency of oscillation is equal to the frequency of vortex shedding, the negative effect of resonance occurs, and harming of the structure is expected. The phenomenon is undesired and can be avoided by designing the disk in order to have the natural frequencies higher as the shedding frequencies. The study is performed via the finite element method (FEM) and first concerns in finding the proper disk thickness for the valve's geometrical input parameters by static analysis. Afterward, modal analysis on disks with stiffness ribs of various shapes and positions is made. As a result, guidelines for designing the disk's stiffening elements are provided.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/163/1/012041