两端一般支承裂纹管道的动力学特性  

Dynamic characteristics of a cracked pipe conveying fluid with both elestically supported ends

作　　者：包日东[1] 梁峰[1] 

机构地区：[1]沈阳化工大学,沈阳110142

出　　处：《振动与冲击》2016年第7期220-224,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51275315)

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。The dynamic characteristics of a cracked pipe conveying fluid with both ends supported elastically were studied. The bending vibration modal functions of the cracked pipe were derived using the general beam modal functions adding a cubic polynomial. The influences of elastic stiffness coefficients,mean flow velocity,circumference angle of crack and crack position on the natural frequencies and fluid critical flow velocity of the pipe system were simulated and analyzed based on the eigenequation of the piping system. The numerical results showed that the natural frequencies and the fluid critical flow velocity vary complicatedly due to crack existing.

关 键 词：输流管道 裂纹 动力学特性 固有频率 临界流速 

分 类 号：O322[理学—一般力学与力学基础]