THE MULTI-MODE RESPONSE OF A CYLINDER UNDERGOING SIMULTANEOUS VORTEX-INDUCED AND WAKE-INDUCED VIBRATIONS
圆柱体同时经历涡激振动和尾流振动的多模态响应
基本信息
- 批准号:EP/E027423/1
- 负责人:
- 金额:$ 3.01万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2007
- 资助国家:英国
- 起止时间:2007 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The offshore oil industry needs to know how to design tensioned pipes (or 'risers') that go from the oil rig at the sea surface down to the sea bed, a vertical distance that may be much more than 1000m. One of the problems is that over this length ocean currents can cause the risers to vibrate like guitar strings. Vibrations can lead to metal fatigue and can also cause adjacent risers in an array to clash into each other. Both fatigue failures and clashing can have potentially disastrous consequences. Knowing how far apart the risers should be in order to avoid clashing is an issue of considerable importance, since their spacing has huge cost implications for any offshore installation in deep water.Vibrations of risers are generated by two or three different mechanisms which produce excitation of different structural modes, and the response consists of a combination of modes, rather like those that make up the pattern of vibrations of a guitar string. The most important mechanisms that cause risers to vibrate are vortex shedding and wake galloping. The first of these is associated with the periodic shedding of vortices of alternating directions of rotation. Wake galloping refers to the motion of one body downstream of another, generated by the non-uniformity of the flow in the wake. The maximum amplitude of vibrations caused by vortex shedding alone is not much more than one diameter, but in a riser this can occur in high modes and the resulting large bending stresses can drastically reduce fatigue life. Wake galloping on the other hand can cause excursions of many diameters at much lower frequencies, and tends to excite the riser's lowest modes of oscillation. Almost all of what is known about these two processes comes from experiments in which one or other has been studied under simpler conditions. An approach that has been followed before is to study the motion of a stiff cylinder mounted on an elastic system which fixes its single natural frequency (representing one of the multiple natural frequencies of a riser). The problem with this is that in practice vortex-induced vibrations and wake galloping resonate with two distinct natural frequencies of a riser. Moreover, these two fluid mechanisms interact. Vortex-induced vibrations have a major effect on drag, and thus on the instability of one riser in the wake of another. The motion of a riser undergoing wake galloping affects its relative incident flow speed, which in turn determines the frequency and amplitude of vortex-induced vibrations.In this project we plan to build an experiment that will for the first time allow us systematically to study the response of a cylinder which is excited by these two processes simultaneously. To do this, the downstream cylinder has to be mounted on a compound elastic system that has two natural frequencies in each direction: in-line with, and transverse to the incident current. The experiment has several adventurous features and so we shall take care to ensure that, in conditions in which the system is restricted to a single natural frequency, we can reproduce earlier measurements. In subsequent tests we shall investigate a range of cases where the cylinder is undergoing vortex-induced vibration at one frequency at the same time as wake galloping at another. The results will help us to understand the interaction between them, and will provide unique benchmarking data for several groups around the world who are developing software to predict the response of risers to these flow-induced forces and assess fatigue damage and the probability of clashing.
海上石油工业需要知道如何设计从海面上的石油钻井平台到海床的张紧管道(或“立管”),垂直距离可能远远超过1000米。其中一个问题是,在这个长度上,洋流会导致海浪像吉他弦一样振动。振动会导致金属疲劳,也会导致阵列中相邻的金属片相互碰撞。疲劳故障和碰撞都可能产生潜在的灾难性后果。为了避免碰撞,了解锚栓之间的距离是一个相当重要的问题,因为它们的间距对于深水中的任何海上装置都具有巨大的成本影响。锚栓的振动由两个或三个不同的机制产生,这些机制产生不同结构模式的激励,并且响应包括模式的组合,就像吉他弦的振动模式一样。涡脱落和尾流驰振是引起尾流振动的最重要的机理。其中第一个与交替旋转方向的涡旋的周期性脱落有关。尾流驰振是指一个物体在另一个物体下游的运动,由尾流中流动的不均匀性产生。单独由旋涡脱落引起的最大振幅不超过一个直径,但在立管中,这可能发生在高模式下,并且由此产生的大弯曲应力可能会大大降低疲劳寿命。另一方面,尾流驰振可以在低得多的频率下引起许多直径的偏移,并且倾向于激发立管的最低振荡模式。几乎所有关于这两个过程的知识都来自于在较简单的条件下研究其中一个过程的实验。之前采用的一种方法是研究安装在弹性系统上的刚性圆柱体的运动,该弹性系统固定其单一固有频率(代表立管的多个固有频率之一)。这样做的问题是,在实践中,涡激振动和尾流驰振与立管的两个不同的固有频率共振。此外,这两种流体机制相互作用。涡激振动对阻力有很大影响,从而对一个立管在另一个立管尾流中的不稳定性有很大影响。尾流驰振引起的立管运动会影响其相对入射流速,进而决定涡激振动的频率和振幅。在本项目中,我们计划建立一个实验,首次系统地研究圆柱体在这两个过程同时激励下的响应。为此,下游圆柱体必须安装在复合弹性系统上,该系统在每个方向上具有两个固有频率:与入射电流成直线和横向。该实验有几个冒险的特点,所以我们要注意确保,在系统被限制在一个单一的自然频率的条件下,我们可以重现以前的测量。在随后的试验中,我们将研究一系列的情况,其中圆柱体在一个频率下发生涡激振动,同时在另一个频率下发生尾流驰振。这些结果将帮助我们理解它们之间的相互作用,并将为世界各地的几个团队提供独特的基准数据,这些团队正在开发软件来预测涡轮对这些流诱导力的响应,并评估疲劳损伤和碰撞概率。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Peter Bearman其他文献
Gendering the Job: Networks and Recruitment at a Call Center1
工作性别化:呼叫中心的网络和招聘1
- DOI:
- 发表时间:
2005 - 期刊:
- 影响因子:4.4
- 作者:
Roberto M. Fernandez;M. L. Sosa;L. Bailyn;Peter Bearman;John Carroll;Tiziana Casciaro;Emilio Castilla;Adair Crosley;Paula England;Christopher Jencks;Joe Galaskiewicz;Isabel Fernandez;Monica Higgins;Paul Osterman;D. Pager;Trond Pe;Damon Phillips;Brian Rubineau;Michele Williams;Mit Roberto Fernan - 通讯作者:
Mit Roberto Fernan
Study Design A Prospective Sociocentric Study of 2 Entire Traditional Korean Villages: The Korean Social Life, Health, and Aging Project (KSHAP)
研究设计对两个韩国传统村庄进行前瞻性社会中心研究:韩国社会生活、健康和老龄化项目 (KSHAP)
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
Jiwon Baek;E. Baldina;Kiho Sung;Sung;N. Christakis;Peter Bearman;Hyeon Chang Kim;Sang Hui Chu;Eun Lee;Yeong;J. Chey;Youn;Dohoon Lee;Y. Youm - 通讯作者:
Y. Youm
Authors' Response to: Cohort effects explain the increase in autism diagnosis among children born from 1992 to 2003 in California.
作者回应:群体效应解释了 1992 年至 2003 年出生的加利福尼亚州儿童自闭症诊断率增加的原因。
- DOI:
- 发表时间:
2013 - 期刊:
- 影响因子:7.7
- 作者:
K. Keyes;Peter Bearman - 通讯作者:
Peter Bearman
Buprenorphine dissemination in the public sector: Social network analysis and institutional constraints of prescribers in New York City
- DOI:
10.1016/j.drugalcdep.2014.09.283 - 发表时间:
2015-01-01 - 期刊:
- 影响因子:
- 作者:
Helena Hansen;Peter Bearman;Sonia Mendoza;John Rotrosen - 通讯作者:
John Rotrosen
Peter Bearman的其他文献
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{{ truncateString('Peter Bearman', 18)}}的其他基金
RAPID: New York Covid-19 Chronicle and Oral History Archive
RAPID:纽约 Covid-19 编年史和口述历史档案
- 批准号:
2028622 - 财政年份:2020
- 资助金额:
$ 3.01万 - 项目类别:
Standard Grant
Doctoral Dissertation Research: Understanding Organizational Anticipation and Response to Disaster Risks
博士论文研究:了解组织对灾害风险的预期和响应
- 批准号:
1519280 - 财政年份:2015
- 资助金额:
$ 3.01万 - 项目类别:
Standard Grant
Doctoral Dissertation Research: Novel Graph Models for Studying Mobilization
博士论文研究:研究动员的新颖图模型
- 批准号:
1435138 - 财政年份:2014
- 资助金额:
$ 3.01万 - 项目类别:
Standard Grant
Doctoral Dissertation Research in Science of Science and Innovation Policy: From Cycles to Spirals: Structural Analysis of Scientific Consensus Formation
科学与创新政策博士论文研究:从循环到螺旋:科学共识形成的结构分析
- 批准号:
0965432 - 财政年份:2010
- 资助金额:
$ 3.01万 - 项目类别:
Standard Grant
Doctoral Dissertation Research - Structure and Growth: English Trade in the East Indies, 1601-1835
博士论文研究 - 结构与增长:英国在东印度群岛的贸易,1601-1835 年
- 批准号:
0526490 - 财政年份:2005
- 资助金额:
$ 3.01万 - 项目类别:
Standard Grant
SGER: Narrative Networks: The World Trade Center Tragedy
SGER:叙事网络:世贸中心悲剧
- 批准号:
0140024 - 财政年份:2002
- 资助金额:
$ 3.01万 - 项目类别:
Standard Grant
Doctoral Dissertation Research: Class and the Color Line: The Knights of Labor in the South, 1880-1890
博士论文研究:阶级与肤色界限:南方的劳工骑士,1880-1890
- 批准号:
9711807 - 财政年份:1997
- 资助金额:
$ 3.01万 - 项目类别:
Standard Grant
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