Vibration mode and flange root stress of side bushing of converter transformer valve

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (13) : 201-209.

ZHAO Lihua, CAI Weizhe, HUANG Xiaolong, REN Junwen, JIA Lichuan, WANG Zhong

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Abstract

Bushing flange is the weak part of side bushing of converter transformer valve, it is subjected to complex environmental dynamic forces, such as, vibration of converter transformer, and it is easy to have fatigue cracking due to long-term action of mechanical load, and cause shutdown of converter transformer. Stress concentration is the main factor leading to structural fatigue cracking, but there are few studies on stress distribution and fatigue of flanges. Here, in order to optimize root structure of bushing flange and improve its fatigue strength, the FE simulation method was used to analyze stress distribution of flange, and study stress concentration characteristics of flange under different root structures. The modal analysis and response spectrum analysis were used to study stress distribution of flange under vibration load. The study results showed that stress is concentrated at flange corner and decreases with increase in curvature radius of flange corner; the stiffener connected with flange on bushing can obviously reduce flange corner stress, and the reduction amplitude increases with increase in width and height of stiffener; triangular stiffener can obviously reduce flange corner stress near stress concentration position, and the reduction amplitude decreases with increase in installation angle of stiffener; the maximum stress at flange corner of the bushing subjected to vertical and axial vibrations is obviously suppressed by the connected stiffener.

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side bushing of converter transformer valve / flange / finite element (FE) analysis / stress concentration

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ZHAO Lihua, CAI Weizhe, HUANG Xiaolong, REN Junwen, JIA Lichuan, WANG Zhong. Vibration mode and flange root stress of side bushing of converter transformer valve[J]. Journal of Vibration and Shock, 2021, 40(13): 201-209

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