Flutter Control Mechanism of Dual Active Aerodynamic Flaps with Adjustable Mounting Distance for a Bridge Girder

IF 4.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Zilong Wang, Genshen Fang, Ke Li, Lin Zhao
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引用次数: 0

Abstract

Active flap is an advanced aerodynamic measure that can effectively increase the flutter performance of flexible bridges, but its control mechanism is still confusing due to the complex phenomenon of aerodynamic interference between the deck and flaps. This study proposes an assessment method to clarify the flutter control mechanism of the deck-flap system by the computational fluid dynamics (CFD) method and quantifies the contribution of the aerodynamic damping from the active flaps. It is found that the composition of active flap to the improvement of flutter performance can be divided into torque effect and interference effect. Also, the torque effect of the flaps mainly provides equivalent positive aerodynamic damping ratio under effective control parameters, but the interference effects with the deck and two flaps are not the same, and the mutual interference effect between the two flaps is very weak. For the purpose of investigating the aerodynamic interference influence between the girder and flaps, the research further discussed the impact of the distance between the deck mounting position and the bridge girder on the system flutter performance. As the distance increases, the flutter performance of the system gradually improves. Also, the torque effect of the leading and trailing flaps will increase with distance. However, the interference effects of the flaps on both sides show different rules. In total aerodynamic damping ratio of the deck-flap system, the torque effect accounts for about 70% and interference effect accounts for 30%. As the distance increases, the torque effect gradually becomes stronger and the interference effect gradually weakens.

Abstract Image

安装距离可调的桥梁双主动空气动力襟翼的扑翼控制机制
主动襟翼是一种先进的空气动力措施,可有效提高柔性桥梁的扑翼性能,但由于桥面与襟翼之间存在复杂的空气动力干扰现象,其控制机制仍令人困惑。本研究提出了一种评估方法,通过计算流体动力学(CFD)方法阐明桥面-襟翼系统的扑翼控制机制,并量化了主动襟翼的气动阻尼贡献。研究发现,主动襟翼对改善扑翼性能的作用可分为扭矩效应和干扰效应。同时,在有效的控制参数下,襟翼的扭矩效应主要提供等效的正气动阻尼比,但与甲板和两块襟翼的干涉效应并不相同,两块襟翼之间的相互干涉效应很弱。为了研究大梁与襟翼之间的气动干扰影响,研究进一步讨论了桥面安装位置与桥梁之间的距离对系统扑翼性能的影响。随着距离的增加,系统的扑翼性能逐渐改善。同时,前襟翼和后襟翼的扭矩效应也会随着距离的增加而增加。然而,两侧襟翼的干涉效应却呈现出不同的规律。在甲板襟翼系统的总气动阻尼比中,扭矩效应约占 70%,干扰效应占 30%。随着距离的增加,扭矩效应逐渐增强,干涉效应逐渐减弱。
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来源期刊
Structural Control & Health Monitoring
Structural Control & Health Monitoring 工程技术-工程:土木
CiteScore
9.50
自引率
13.00%
发文量
234
审稿时长
8 months
期刊介绍: The Journal Structural Control and Health Monitoring encompasses all theoretical and technological aspects of structural control, structural health monitoring theory and smart materials and structures. The journal focuses on aerospace, civil, infrastructure and mechanical engineering applications. Original contributions based on analytical, computational and experimental methods are solicited in three main areas: monitoring, control, and smart materials and structures, covering subjects such as system identification, health monitoring, health diagnostics, multi-functional materials, signal processing, sensor technology, passive, active and semi active control schemes and implementations, shape memory alloys, piezoelectrics and mechatronics. Also of interest are actuator design, dynamic systems, dynamic stability, artificial intelligence tools, data acquisition, wireless communications, measurements, MEMS/NEMS sensors for local damage detection, optical fibre sensors for health monitoring, remote control of monitoring systems, sensor-logger combinations for mobile applications, corrosion sensors, scour indicators and experimental techniques.
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