具有弹性支承的圆管在内外部流激发下动力特性及实验研究

本文建立了具有弹性支承的圆管在内外部流激发下的力学模型.推导了内部流与静止外部流作用下圆管的耦联振动方程.提出了确定弹性系数的方法.采用振型叠加法分析圆管动力特性问题.对内部流与静止外部流情况下圆管固有频率进行了计算和测量,计算值与实验值吻合较好.另外,对内外流同时激发下圆管的固有频率进行了测量,得到若干对工程实际有用的结论.

Study of Dynamic Characteristics of the Elastic-Supported Pipe Conveying Fluid and Subjected to Outside Cross Fluid Flow and its Experimental Research

In this paper, we have set up a mechanical model of the elastic-supported pipe conveying fluid and subjected to outside cross fluid flow. We have deduced the coupling vibration equation of a pipe conveying fluid and subjected to static fluid. A method is proposed to determine the elastic-support coefficient. The vibration mode reiteration is adopted to analyze the dynamic characteristics of the pipe. The natural frequency of the pipe conveying fluid and subjected to static fluid is calculated and measured respectively. The calculating result matches very well with the experiment result. Besides, the natural frequency of the pipe conveying fluid and subjected to outside cross fluid flow is measured. A conclusion which is useful and valueable for engineering is reached.