Predicting Dynamic Response of Structural Cables and Power Transmission Lines in Hurricanes and Other Windstorms

预测飓风和其他风暴中结构电缆和输电线路的动态响应

• 批准号: 1537917
• 负责人: Partha Sarkar
• 金额: $ 33.78万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1537917&HistoricalAwards=false
• 关键词: Predicting; Dynamic; Response; Structural; Cables

Cables are often used in groups/bundles in a variety of engineering applications such as in suspension bridges, suspended roofs, guyed lattice towers, and power transmission. These cables are prone to large-amplitude vibrations in wind alone and in wind combined with precipitation (rain or ice). The vibrations can lead to fatigue damage and in some cases catastrophic failure of cables posing a threat to safety. Past investigations involving individual cables with smooth surface have resulted in an improved understanding of vortex-induced and rain-wind-induced vibration phenomena. However, there is a need for a credible wind load model that can be used to predict the dynamic response of bundled cables in turbulent and transient wind at moderate to high wind speeds. This research is to improve the resilience of cables used in cable-supported structures and power transmission lines to hazards of hurricanes and other windstorms. The study will facilitate development/evaluation of potential mitigation strategies leading to a reliable civil and power infrastructure. In this project, a synergistic computational and experimental approach will study galloping of bare-cable and cable covered with ice to address the technology gaps. The specific objectives are (a) to improve understanding of aeroelastic (motion-induced) behavior of a single and bundled cables used in cable-supported structures and high-voltage power transmission lines in moderate to high wind speeds, (b) to understand the effects of upstream turbulence, non-uniform flow, transient flow, and wake-induced flow on cable response, and (c) to develop a robust time-domain aeroelastic load formulation to predict cable vibration amplitude. The study involves high-fidelity computational fluid dynamics using large eddy simulation, and wind tunnel experiments using section models of single and multiple cylinders and aeroelastic models. The simulation and experiments will be for bare-cables and cables covered with ice in single and grouped configurations. Comparison of computational simulation and wind tunnel experiment results will provide credibility to both procedures. The primary product of this project will be a wind-load model for cables and a methodology that can be used as a tool in structural analysis to identify the vulnerability of cables in a structure or power line at a given wind site.

电缆通常成组/成束地用于各种工程应用中，例如悬索桥、悬吊屋顶、拉线格构塔和电力传输。这些电缆在单独的风中以及风与降水（雨或冰）的组合中易于发生大幅振动。振动会导致疲劳损坏，在某些情况下会导致电缆的灾难性故障，对安全构成威胁。过去的调查涉及个别电缆与光滑表面，导致了更好的理解涡激和风雨引起的振动现象。然而，有一个可靠的风荷载模型，可以用来预测成束电缆在湍流和瞬态风在中等到高风速的动态响应的需要。本研究旨在提高电缆支撑结构和输电线路中使用的电缆对飓风和其他风暴危害的恢复力。该研究将促进制定/评估潜在的缓解战略，从而建立可靠的民用和电力基础设施。在这个项目中，一个协同的计算和实验方法将研究裸电缆和电缆覆盖冰的舞动，以解决技术差距。具体目标是：（a）提高对气动弹性的理解在中等至高风速下，用于电缆支撑结构和高压输电线路的单根和成束电缆的（运动诱导）行为，（B）了解上游湍流、非均匀流、瞬态流和尾流诱导流对电缆响应的影响，以及（c）开发鲁棒的时域气动弹性载荷公式以预测缆索振动幅度。 该研究包括使用大涡模拟的高保真计算流体动力学，以及使用单个和多个气缸的截面模型和气动弹性模型的风洞实验。模拟和实验将裸电缆和电缆覆盖冰在单个和分组配置。将计算模拟结果与风洞试验结果进行比较，可以为两种方法的可靠性提供依据。该项目的主要产品将是电缆的风荷载模型和一种方法，可用作结构分析的工具，以确定特定风场结构或电力线中电缆的脆弱性。

项目成果

Parameter identification of wind-induced buffeting loads and onset criteria for dry-cable galloping of yawed/inclined cables

• DOI: 10.1016/j.engstruct.2018.11.049
• 发表时间: 2019-02
• 期刊: Engineering Structures
• 影响因子: 5.5
• 作者: M. Jafari;P. Sarkar

Wind Tunnel Study of Wake-induced Aerodynamics of Parallel Stay-Cables and Power Conductor Cables in a Yawed Flow

偏航流中平行斜拉索和电力导线尾流引起的空气动力学的风洞研究

• DOI: 10.12989/was.2020.30.6.617
• 发表时间: 2020
• 期刊: Wind and Structures
• 影响因子: 1.6
• 作者: Jafari, M.;Sarkar, P.P.
• 通讯作者: Sarkar, P.P.

Verification of DES for Flow over Rigidly and Elastically-Mounted Circular Cylinders in Normal and Yawed Flow

正向流动和偏航流动中刚性和弹性安装圆柱体流动的 DES 验证

• DOI: 10.1016/j.jfluidstructs.2020.102895
• 发表时间: 2020
• 期刊: Journal of fluids and structures
• 影响因子: 3.6
• 作者: Wu, X.;Jafari, M.;Sarkar, P.;Sharma, A.
• 通讯作者: Sharma, A.