Instability of Internally Damped Curved Pipes
Instability of Internally Damped Curved Pipes
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DOI：
10.1061/(asce)0733-9399(1990)116:1(77
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
R. Aithal;G. Gipson
中科院分区：
文献类型：
--
作者：
R. Aithal;G. Gipson
根据汉密尔顿原理，导出了考虑阻尼影响的输流管道运动方程。根据管道端部的约束条件，诱导或施加的端部力可分为保守力或非保守力。结果表明，当考虑内阻尼时，保守系统可能发生颤振失稳。在某些情况下，弯管维持流动的能力受内部阻尼系数的影响很大。当流速增加时，弯曲角小于90°的管道产生的固有频率与弯曲角大于90°的管道产生的固有频率不同。数值计算结果的参数范围很广，包括流体速度，阻尼参数，和角度的管道弯曲。
The equation of motion of a fulid‐conveying pipe that includes the effect of damping is derived on the basis of Hamilton's principle. Depending upon the constraint conditions on the ends of the pipe, the induced or applied end forces may be classified as being either conservative or nonconservative. It is shown that when internal damping is taken into consideration, the conservative system could be subjected to a flutter type of instability. In certain cases, the capacity of the curved pipe to sustain flow is greatly affected by the internal damping factor. Under increasing fluid velocity, the pipes with an angle of bend less than 90° yield natural frquencies that do not follow the pattern of the pipe bends with angles of bend greater than 90°. Numerical results are presented for a wide range of parameters, including fluid velocity, damping parameter, and angle of the pipe bend.