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| 1 | Dynamical Stability of Cantilevered Pipe Conveying Fluid with Inerter-Based Dynamic Vibration Absorber显示文摘Cantilevered pipe conveying fluid may become unstable and flutter instability would occur when the velocity of the fluid flow in the pipe exceeds a critical value.In the present study,the theoretical model of a cantilevered fluid-conveying pipe attached by an inerter-based dynamic vibration absorber(IDVA)is proposed and the stability of this dynamical system is explored.Based on linear governing equations of the pipe and the IDVA,the effects of damping coefficient,weight,inerter,location and spring stiffness of the IDVAon the critical flow velocities of the pipe system is examined.It is shown that the stability of the pipe may be significantly affected by the IDVA.In many cases,the stability of the cantilevered pipe can be enhanced by designing the parameter values of the IDVA.By solving nonlinear governing equations of the dynamical system,the nonlinear oscillations of the pipe with IDVA for sufficiently high flow velocity beyond the critical value are determined,showing that the oscillation amplitudes of the pipe can also be suppressed to some extent with a suitable design of the IDVA. | Zhiyuan Liu Xin Tan Xiaobo Liu Pingan Chen Ke Yi Tianzhi Yang Qiao Ni Lin Wang | 2020 | Computer Modeling in Engineering & Sciences2020，，11： | 2 |
| 2 | 基于尾流振子模型的套管涡激振动响应研究显示文摘针对PIP(Pipe In Pipe)系统(套管)的涡激振动问题,开展了对PIP系统在涡激振动作用下的动力学响应研究,分析了在涡激振动作用下不同无因次波数、内外管道直径比、连接层刚度以及张力对海洋立管位移响应的影响规律。研究基于Euler-Bernoulli双梁理论,采用尾流振子模型,建立了动力学模型,利用谐波平衡法求得内、外管道的振动响应表达式。结果表明,在不同无因次波数的作用下,套管的振动存在不稳定现象,在七阶模态时,管道的振动出现单一频率的振动现象;在高频率比区域,随着无因次连接层刚度的增大,内、外部管道的位移均呈现先减小后增大的趋势,并且逐渐趋于稳定;张力对外部管道位移的影响相对复杂,内部管道的位移随张力的增大呈现减小的趋势。 | 赵翔 谭明 | 2022 | 西南石油大学学报(自然科学版)2022，44，6： | 1 |
| 3 | Euler-Bernoulli海洋立管涡致强迫振动响应研究显示文摘针对海洋立管(Pipe-in-pipe,PIP)系统在海水作用下发生的振动问题,开展了对PIP系统在涡致强迫振动下的动力学响应研究,分析了在涡致强迫振动下海洋立管外管直径、轴向拉力、外激力频率对海洋立管位移响应的影响规律。基于Euler-Bernoulli双梁模型,采用Lamb-Oseen涡模型,建立了动力学模型,利用格林函数法求得该强迫振动的稳态响应。结果表明,随着管道直径增加,外激力增加,产生最大力幅值的位置离管道越远;轴向拉力对外部管道的影响较大,对内部管道的影响较小;无因次频率取0.4时,外部管道位移超出允许变形极限,内外管壁发生周期碰撞,易对海洋立管造成损伤。 | 赵翔 谭明 李映辉 邵永波 | 2023 | 西南石油大学学报(自然科学版)2023，45，4： | 1 |
| 4 | Divergence and flutter instability of magneto-thermo-elastic C-BN hetero-nanotubes conveying fluid显示文摘On the basis of finite element analysis,an eigenvalue problem is performed to examine the vibrational characteristics of a hetero-nanotube made of carbon(C)and boron nitride(BN)nanotubes in magnetic and thermal environment.By incorporating the assumption of nonlocal elasticity theory,the size-dependent behavior of the considered structure is also taken into account.The obtained results demonstrate that the onset of the divergence and flutter instabilities may be postponed by exploiting a hetero-nanotube rather than a uniform one composed of carbon nanotube.Moreover,it is exhibited that,in the presence of fluid flow,the mode shape configuration of nanotubes may be different from those of classical modes and therefore the later one should not be utilized in the dynamic analysis of fluid-conveying tubes.Finally,it is shown that,as the temperature decreases,the natural frequencies of the system decrease in high temperature conditions and increase for the case of room temperature. | Hamid M.Sedighi | 2020 | Acta Mechanica Sinica2020，36，2： | 0 |
| 5 | 海上管中管结构力学研究现状与发展显示文摘为了避免风浪流、泥线低温等海洋环境载荷对钻完井作业及生产管柱的影响,海上管中管结构以其良好的安全保护、保温、传输等性能被广泛应用。目前,管中管的力学、强度及安全分析主要依据单管结构进行。为了系统梳理管中管在作业过程中力学分析方法,对管中管的结构组成,海上单管承内压、外压、屈曲设计与校核分析方法进行了介绍;同时,根据海上管柱易出现横向塌陷的特点,在单管塌陷及其传播公式基础上,对管中管的4种主要塌陷模式、管中管的塌陷传递压力计算方法进行了说明;在总结管中管动力学分析理论及其成果的基础上,提出了管中管结构动力学研究的发展方向。该研究有助于中国海上管中管结构力学的深入研究,可为中国深水领域的管中管安全作业提供借鉴。 | 孙巧雷 张辉易 姚力萍 李乐勤 张圆圆 冯定 | 2023 | 科学技术与工程2023，23，21： | 0 |
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