Influence factor analysis on anti-whip restraint of ship's main steam pipeline based on LS-DYNA

Chinese Journal of Ship Research - - News -

XUE Meixin,YANG Pengju,ZHAO Cuina China Ship Development and Design Center,Wuhan 430064,China To address the high-energy pipe whip design problem faced by the nuclear power plants of ships,[Methods] LS-DYNA software is used to establish a nonlinear finite element model of the main steam pipe and U-shaped whip restraint device(i.e U-bolt)so as to simulate the dynamic whipping process. It is found that the whip restraint rejection force reaches its maximum peak at the primary collision and reduces towards the static support reaction after several collisions. Within a range of 40 -120 mm,the maximum rejection force increases as the initial clearance between the pipe and U-bolt whip restraint device is increased,while the increasing slope gradually reduces and the dynamic magnification factor comes to a limit of 1.74. Within the range of 1.5D - 2.5D,the maximum rejection force decreases slightly by 2.5% as the relative axial location between the pipe and U-bolt whip restraint device is increased. Compared with the U-bolt whip restraint,the U-shaped plate can not only reduce the cross-sectional area by 16.3% but also lessen the maximum rejection force by 5.5% analysis results show that the maximum rejection force of the U-shaped plate whip restraint device has a positive correlation with the initial clearance of the restraint,but there is a limit to the dynamic magnification factor,the square section U-shaped plate whip restraint device has greater bearing capacity.

Abstract:[Objectives] .[Conclusions]The words:main Key [Results]

steam pipe;pipe whip restraint design;LS-DYNA;U-shaped plate

收稿日期:2017 07 25 网络出版时间:2018-4-11 8:37作者简介:薛梅新(通信作者),男,1985年生,博士,工程师。研究方向:舰船动力。E-mail:xuemeixin2007 @163.com杨鹏举,男,1986年生,硕士,工程师。研究方向:舰船动力。E-mail:330602942@qq.com赵翠娜,女,1981年生,硕士,高级工程师。研究方向:舰船动力

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