摘要
研究了两种最常见的流体管段结构模型与计算。对于直管,利用拉氏变换把时域方程变换到频域,对频域方程进行推导求解,得到了直管的频域解析解;对于弯管,直接对方程模型进行整体求解,同样求得了其频域解析解。然后以Davidson单弯管模型为例,说明典型管段结构组合的管道系统的求解方法,并验证直管以及弯管模型和求解方法的正确性。最后,通过改变弯管的弯曲半径以及角度来对管道的流固耦合振动特性的影响因素进行分析。结果表明,弯曲角度以及弯曲半径越小,频谱曲线密集程度越低,耦合振动越弱,反之越强。
The models of two kinds of the most common pipe section structures and their analytical solutions were studied.For straight pipes,a time-domain equation model considering fluid-structure interaction described by partial differencial equation was set up.And the equation was transferred into frequency domain by Laplace transformation,from which an analytical solution was obtained.For curved pipes,the model was directly solved to get an overall solution and also an analytical solution was obtained.Then the single-bend pipe model set up by Davidson was taken as an example to simply illustrate and verify the solving method for the combined structure composed of these two pipe sections.Finally,the factors affecting the characteristics of fluid-structure interaction were analyzed by changing the bend radius and angle of curved pipe.The results show that the smaller the bend radius and angle of curved pipe,the lower the density of the spectrum diagram,showing the less severity of coupled vibration.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第6期50-53,124,共5页
Journal of Vibration and Shock
关键词
流体管道
流固耦合
频域
传递矩阵
fluid-filled pipes
fluid-structure interaction
frequency domain
transfer matrix
