Multistable dynamic behaviors of cantilevered curved pipes conveying fluid

IF 3.4 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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引用次数: 0

Abstract

The present study newly found multistable dynamic characteristics of cantilevered curved pipes conveying fluid due to the gravity. These multistable behaviors of the pipe offer a promising avenue for the development and deployment of fluid actuators. Three configurations of curved pipes, namely, one-quarter circular, semi-circular, and three-quarter circular, are considered. A nonlinear dynamic theoretical model is established based on the geometrically exact model to investigate the large deformation behaviors of the curved pipe conveying subcritical fluid flows. The theoretical model for predicting large deformations of the curved pipe is validated through the finite element method (FEM). Afterwards, linear dynamic characteristics for three configurations of curved pipes are explored. Strangely, the discontinuity phenomenon for natural frequencies of the curved pipe occurs with increasing the flow velocity, which has never been reported before. Meanwhile, it is demonstrated that the gravity parameter has a significant effect on the critical velocity for flutter. Large deformation responses of the curved pipe in three configurations are further investigated, multistable dynamic behaviors are detected for all considered curved pipes. It displays that for different gravity parameters, the dynamic behavior of curved pipe is varying from a single state to multiple states with increasing the flow velocity. Results indicate that when the dimensionless gravity parameter and fluid velocity are 15 and 2.5, the curved pipe exhibits three distinct displacements due to static deformations. These three displacements are in three equilibrium states, which helps to explain the interesting phenomenon of frequency discontinuity.
输送流体的悬臂弯曲管道的多稳态动态行为
本研究新近发现,由于重力作用,输送流体的悬臂弯曲管道具有多稳动态特性。管道的这些多稳态行为为流体致动器的开发和应用提供了一个前景广阔的途径。本文考虑了四分之三圆、半圆和四分之三圆三种弯曲管道的配置。在几何精确模型的基础上建立了非线性动态理论模型,以研究输送亚临界流体的弯曲管道的大变形行为。通过有限元法(FEM)验证了预测弯曲管道大变形的理论模型。随后,探讨了三种配置的弯曲管道的线性动态特性。奇怪的是,随着流速的增加,弯曲管道的固有频率出现了不连续现象,这是以前从未报道过的。同时,研究还证明重力参数对飘移的临界速度有显著影响。进一步研究了三种配置的弯曲管道的大变形响应,发现所有考虑的弯曲管道都存在多稳动态行为。结果表明,对于不同的重力参数,随着流速的增加,弯管的动态行为从单一状态变为多重状态。结果表明,当无量纲重力参数和流体速度分别为 15 和 2.5 时,由于静态变形,弯曲管道会出现三种不同的位移。这三种位移处于三种平衡状态,有助于解释频率不连续这一有趣现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Fluids and Structures
Journal of Fluids and Structures 工程技术-工程:机械
CiteScore
6.90
自引率
8.30%
发文量
173
审稿时长
65 days
期刊介绍: The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.
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