FATIGUE ANALYSIS ON A NON-LINEAR DYNAMIC SYSTEM

机译：非线性动力系统的疲劳分析

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The heating coil in the radiation section of a gas fired furnace experienced excessive vibrations after modifications had been made to the plant. The root cause of coil vibrations had to be identified, integrity of the system assessed, and a recommendation issued to ensure a reliable system for future operation. A theory was developed for the cause of such vibrations, in which flow of liquid slugs through the coil was the source of unbalanced centrifugal forces. This theory was tested and confirmed by a combination of non-linear dynamic finite element simulation, computational fluid dynamics and on-line vibration measurements. The severity of vibrations was determined using cycle counting techniques of actual vibrations, combined with finite element results and the rules as set forth by the ASME pressure vessel design code. Proposed modifications were recommended and evaluated. Modifications related to stiffening of the supporting system and elimination of detrimental flow characteristics.

机译：在对设备进行改造之后，燃气炉辐射区的加热线圈受到了过度的振动。必须确定线圈振动的根本原因，评估系统的完整性，并发布建议以确保将来的运行可靠的系统。针对这种振动的原因，开发了一种理论，其中液体团块通过线圈的流动是不平衡离心力的来源。非线性动态有限元模拟，计算流体动力学和在线振动测量相结合，对这一理论进行了测试和证实。使用实际振动的循环计数技术，结合有限元结果和ASME压力容器设计规范规定的规则，确定振动的严重程度。建议修改建议并进行评估。与支撑系统变硬和消除有害流动特性有关的修改。

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《Sixth International Colloquium on Ageing of Materials and Methods for the Assessment of Lifetimes of Engineering Plant, Apr 30-May 4, 2001, Cape Town/South Africa》|2001年|p.353-364|共12页
会议地点 South Africa(ZA);South Africa(ZA)
作者
D E Botha; C Marais; J K Roux;
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作者单位

MegChem, PO Box 6657, Secunda, 2302, South Africa;

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会议组织
原文格式 PDF
正文语种 eng
中图分类机械、仪表工业;
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机译：齿轮系统的非线性动力学分析

FATIGUE ANALYSIS ON A NON-LINEAR DYNAMIC SYSTEM

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