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

International Conference on Applied Sciences 2016

Ursoniu, C.^1 ; Pepa, D.^1 ; Tufoi, M.^2 ; Gillich, G.R.^2

UCM Resita, Department of Mechanical Engineering, Golului str., no.l, Resita

320053, Romania^1

University of Resita, Department of Engineering and Management, Piata Traian Vuia str., no.1-4, Resita

320085, Romania^2

关键词: Butterfly valve;    Dynamic behaviors;    Frequency of oscillation;    Frequency variation;    Input parameter;    Shedding frequencies;    Stiffening elements;    Stiffening ribs;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/163/1/012041/pdf
DOI  :  10.1088/1757-899X/163/1/012041

来源: IOP

【 摘 要 】

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.