Flow-Induced Noise and Vibration Control in Engineering Structures via Geometric Modifications
通过几何修改控制工程结构中的流动引起的噪声和振动
基本信息
- 批准号:RGPIN-2014-05512
- 负责人:
- 金额:$ 1.75万
- 依托单位:
- 依托单位国家:加拿大
- 项目类别:Discovery Grants Program - Individual
- 财政年份:2017
- 资助国家:加拿大
- 起止时间:2017-01-01 至 2018-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The proposed research program will experimentally investigate the passive control of adverse flow effects in the context of two major engineering problems: The first problem is the control of flow-induced vibration in cylindrical structures, such as offshore risers. Adoption of certain protrusion devices (helical strakes, staggered separation wires, rings, etc) on the structures' surface or slight modifications in their external shape can, in some cases, succeed in suppressing the flow-induced structural vibrations. However, at this point, the knowledge base for the design of such control technologies is still incomplete. The first research campaign in the proposed program aims to address this deficiency by comprehending the flow control induced by various protrusion devices. The central emphasis will be on the exploration of the modified flow characteristics in relation to the structural loads and vibration. Tests will be conducted in the UTIAS water tunnel on stationary, forced- and free-vibrating rigid circular cylinders fitted with a variety of different protrusion devices. Velocimetry (PIV, V3V, and CTA) as well as hydrogen bubble visualization techniques will be used to decipher the flow manipulations. The identified flow patterns will also be linked to the structural loads through synchronized velocimetry and force measurements. This program will progressively build a knowledge base through which efficient control means can be designed to suppress flow-induced vibrations on cylindrical bodies. Many applications of engineering that are in need of guidelines for the development of control measures against flow-induced vibrations will benefit from the outcomes of this program.The other problem is the flow-induced noise issue associated with aircraft landing gears. Owing to the ever-increasing requirements in noise policies, this problem has become a recent subject of interest to aircraft manufacturers. At this point, noise-generation mechanisms for landing gears are still not well understood, and it is therefore difficult to develop efficient strategies to mitigate them. Landing gear noise is a consequence of the unsteady flow formations and their interactions with the aircraft components. For this reason, the proposed program will identify the possible causes of noise generation in 2- and 4-wheel landing gear systems by developing a comprehensive understanding of the coherent, unsteady flow structures forming around them. Using this understanding, where possible, the program will develop new strategies aiming noise reduction. Aerodynamic tests will be carried out in the UTIAS water tunnel. Although typical Mach numbers fall into the incompressible range during approach and takeoff for several airplane, a water facility has never been used before for the investigation of landing gear flows. The advantage of the water facility over traditional wind tunnels is that the water medium slows down the flow dynamics enabling time-resolved capture of the flow behavior using global velocimetry tools (PIV and V3V). In the program, simplified models of landing gears will be studied first. Step by step, test models will incorporate additional geometrical details from real-life landing gears to quantify their effects onto the flow. The accumulated knowledge of the unsteady flow topology will then be used to develop modifications on traditional landing gears to realize noise reduction. The effectiveness of those modifications will be assessed by acoustic tests in the UTIAS anechoic wind tunnel. This research can eventually lead to the development of novel landing gear designs, sensitive to environmental and health issues related to noise. Canada's aviation industry would greatly benefit from such an outcome.
建议的研究计划将在两个主要工程问题的背景下对不利流动影响的被动控制进行实验研究:第一个问题是圆柱形结构物(如海洋立管)中的流致振动控制。在结构表面采用某些突出装置(螺旋带、交错隔离线、环等)或对其外部形状进行轻微修改,在某些情况下可以成功地抑制流致的结构振动。然而,在这一点上,这类控制技术设计的知识库仍然不完整。拟议方案中的第一个研究活动旨在通过了解各种突起设备引起的流量控制来解决这一不足。中心重点将放在与结构载荷和振动相关的修正流动特性的探索上。测试将在UTIAS水洞中进行,测试对象是固定的、强迫振动和自由振动的刚性圆柱体,这些圆柱体安装了各种不同的突出装置。测速技术(PIV、V3V和CTA)以及氢泡可视化技术将被用来破译流动操纵。识别出的流型还将通过同步测速和测力与结构载荷相关联。该计划将逐步建立一个知识库,通过该知识库可以设计有效的控制手段来抑制圆柱体上的流动诱导振动。这项计划的成果将使许多需要制定抗流致振动控制措施指南的工程应用受益。另一个问题是与飞机起落架相关的流致噪声问题。由于噪声政策的要求越来越高,这个问题最近已经成为飞机制造商感兴趣的话题。在这一点上,起落架的噪声产生机制仍然不是很清楚,因此很难制定有效的战略来减轻它们。起落架噪声是非恒定流形成及其与飞机部件相互作用的结果。为此,拟议的计划将通过全面了解起落架周围形成的连贯、非定常流动结构,确定两轮和四轮起落架系统中可能产生噪音的原因。利用这一理解,在可能的情况下,该计划将制定旨在降低噪音的新战略。空气动力测试将在UTIAS水洞中进行。虽然有几架飞机在进场和起飞时的典型马赫数都在不可压缩范围内,但以前从未使用水设备来研究起落架流动。与传统风洞相比,水设施的优势是水介质减缓了流动动力学,从而能够使用全球测速工具(PIV和V3V)以时间分辨的方式捕捉流动行为。在程序中,将首先研究起落架的简化模型。一步一步,测试模型将纳入真实起落架的额外几何细节,以量化它们对流动的影响。然后将积累的非定常流拓扑知识用于对传统起落架进行改进,以实现降噪。这些改进的有效性将通过UTIAS消声风洞的声学测试来评估。这项研究最终可能导致开发出对与噪音相关的环境和健康问题敏感的新型起落架设计。加拿大的航空业将从这样的结果中受益匪浅。
项目成果
期刊论文数量(0)
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Ekmekci, Alis其他文献
Control of flow past a circular cylinder via a spanwise surface wire: effect of the wire scale
- DOI:
10.1007/s00348-011-1093-3 - 发表时间:
2011-09-01 - 期刊:
- 影响因子:2.4
- 作者:
Ekmekci, Alis;Rockwell, Donald - 通讯作者:
Rockwell, Donald
Ekmekci, Alis的其他文献
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