两端一般支承裂纹管道的动力学特性

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (7) : 220-224.

论文

两端一般支承裂纹管道的动力学特性

包日东，梁峰

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Dynamic characteristics of cracked pipe conveying fluid under commonly spring-supported at ends

BaoRidong, Liang Feng

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摘要

研究了两端一般支承输流管道在含有圆周非贯穿裂纹时的动力学特性。在梁模型横向弯曲振动模态函数中加入3次多项式来构造出含裂纹梁的模态函数，根据特征方程具体分析了弹性支承刚度、平均流速、裂纹圆周角、裂纹位置等对系统的固有频率特性和失稳临界流速的影响。数值计算结果表明，由于裂纹的存在，管道的固有频率和静态失稳和动态失稳临界流速将发生复杂的变化。

Abstract

The dynamic characteristics of cracked pipes conveying fluid with both ends supported elastically is studied. The vertical vibration modal function of the cracked pipe is derived from the general beam mode function by adding acubic polynomial.The influence of elastic supporting coefficients, mean flow velocity, angle of circumference of crack and the crack position on natural frequencies and critical instability flow velocity is simulated andanalyzed based on the eigenequation of the piping system. The numerical results show that the natural frequencies and the critical instability flow velocity vary complicatedly as a result of the crack existing on the surface of pipe.

关键词

输流管道 / 裂纹 / 动力学特性 / 固有频率 / 临界流速

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包日东，梁峰. 两端一般支承裂纹管道的动力学特性[J]. 振动与冲击, 2016, 35(7): 220-224

BaoRidong, Liang Feng. Dynamic characteristics of cracked pipe conveying fluid under commonly spring-supported at ends[J]. Journal of Vibration and Shock, 2016, 35(7): 220-224

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