Dynamics of a fluid-conveying pipe composed of two different materials
Dynamics of a fluid-conveying pipe composed of two different materials
复制标题
由两种不同材料组成的流体输送管道的动力学
DOI：
10.1016/j.ijengsci.2013.08.008
复制
发表时间：
2013-12
影响因子：
6.6
通讯作者：
Ni, Q.
中科院分区：
文献类型：
--
作者：
Dai, H.L.;Wang, L.;Ni, Q.
研究了由不同材料制成的两段组成的流体输送悬臂管的动力学，重点研究了两段之间不同长度比引起的影响。考虑两种混合管道：一种由钢和铝制成，另一种由铝和环氧树脂制成。在连续增加流速值的两个代表性案例中计算了混合系统的四个最低模式的复频率，以演示如何从稳定到不稳定的转变。与输送流体的均匀管道相比，混合管道能够表现出更复杂且有时意想不到的动态行为。数值结果表明，在这种混合管道系统中，随着流速的逐渐增加，会出现不稳定-再稳定-不稳定的序列。当两个段之间的长度比连续增加时，不稳定模式的最低阶可能频繁地从一个段转移到另一个段。还证明，随着流速的增加，首先出现在第四模态中的颤振不稳定是可能的，并且某些不稳定模态可能会突然恢复稳定，这是以前没有报道过的。此外，当由较软材料制成的段放置在夹紧端时，系统更容易失去稳定性。在混合管道系统中观察到的一些新结果预计也有助于控制流体输送管道的动力学行为。
The dynamics of fluid-conveying cantilevered pipe consisting of two segments made of different materials is studied, focusing on the effects induced by different length ratios between the two segments. Two kinds of hybrid pipes are considered: one is made of steel and aluminum and the other is made of aluminum and epoxy. The complex frequency of the four lowest modes of the hybrid system is calculated in two representative cases for successively increasing values of the flow velocity to demonstrate how transition from stability to instability takes place. Compared with a uniform pipe conveying fluid, it is found that the hybrid pipe is capable of displaying more complex and sometimes unexpected dynamical behaviors. The numerical results show that in such a hybrid pipe system, an instability–restabilization–instability sequence would occur as the flow velocity is successively increasing. When the length ratio between the two segments is successively increased, the lowest order of unstable modes may frequently shift from one to another. It is also demonstrated that with increasing flow velocity, the flutter instability first occurring in the fourth mode is possible and a certain unstable mode may suddenly regain stability, which has not been reported before. Furthermore, when the segment made of softer material is placed at the clamped end, the system is much easier to lose stability. Some of these new results observed in the hybrid pipe system are also expected to be helpful in controlling the dynamical behaviors of fluid-conveying pipes.
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DOI：
10.1299/jsme1958.24.1354
发表时间：
1981-08
期刊：
Jsme International Journal Series B-fluids and Thermal Engineering
影响因子：
--
作者：
Y. Sugiyama;T. Noda
通讯作者：
Y. Sugiyama;T. Noda
DOI：
10.1098/rspa.1966.0187
发表时间：
1966-08
期刊：
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
影响因子：
--
作者：
R. W. Gregory;M. Païdoussis
通讯作者：
R. W. Gregory;M. Païdoussis
DOI：
10.1115/1.3424205
发表时间：
1977-12
期刊：
--
影响因子：
--
作者：
R. Blevins;R. Scanlan
通讯作者：
R. Blevins;R. Scanlan
考虑微流和微结构尺寸效应的微尺度流体输送管道的弯曲振动
DOI：
10.1016/j.ijengsci.2013.06.006
发表时间：
2013-10-01
影响因子：
6.6
作者：
Wang, L.;Liu, H. T.;Wu, Y.
通讯作者：
Wu, Y.
DOI：
10.1016/s0020-7462(97)00002-4
发表时间：
1998-01-01
影响因子：
3.2
作者：
Paidoussis, MP;Semler, C
通讯作者：
Semler, C