Optimisation of Structures Excited by Wind under Consideration of Stochastic Actions and Various Limit States

考虑随机作用和各种极限状态的风激结构优化

基本信息

项目摘要

Civil structures are exposed to complex wind actions as a result of the effects in the atmospheric boundary layer. Slender structures such as bridges, towers and mastes may be prone to significant vibrations induced by the aerodynamic effects arising from the wind. Phenomena of practical relevance are vortex induced vibrations, buffeting and flutter.The aerodynamic behaviour of structures is influenced primarily by their geometry, which proposes mathematical shape optimisation strategies linked to computational fluid dynamics simulations as a means to improve their aerodynamic performance. The selection of relevant limit states and the stochastic description of effect and resistance parameters allow the reliability based assessment of the structural response as the target of the optimisation procedure.This project aims to develop a methodological framework for the robust optimisation of structural response under the effect of a stochastically described natural wind field in respect of various limit states. To this end, existing numerical simulation procedures based on the pseudo-threedimensional Vortex Particle Method with extensions for turbulent inflow conditions and fluid-structure coupling are extended to allow the computationally efficient analysis of the relevant effects. Specifically, the stochastic parameters of the wind field are to be reproduced, the structural response is to be analysed in respect of the limit states and the parallelised simulations are to be linked to the optimisation strategies.Additionally, existing models for a phenomena based analysis of the excitation mechanisms such as quasi-static aerodynamic force coefficients, force amplitudes of vortex shedding, Strouhal Number, Scanlan Derivatives and admittance functions are employed to increase the efficiency of the optimisation and to allow a de-coupling of the fluid and structural. The validation and interpretation of simulation and optimisation results will be supported by experiments in the wind tunnel and the use of visualisation tools in the new Digital Bauhaus Lab of Bauhaus University.In conclusion, the project will yield a validated method for the efficient and parallelised simulation of wind excitation of line-like structures exposed to natural wind in the context of a limit state based optimisation. This will also be relevant for similar problems in structural dynamics. Sample analyses will be used to showcase the ability of the method to improve aerodynamic performance in relation to various limit states.
由于大气边界层的影响,土木结构暴露于复杂的风作用下。细长结构,如桥梁、塔架和桅杆,可能容易受到风产生的空气动力学效应引起的显著振动。具有实际意义的现象是涡激振动、抖振和颤振。结构的空气动力学行为主要受其几何形状的影响,因此提出了与计算流体动力学模拟相关联的数学形状优化策略,作为改善其空气动力学性能的一种手段。相关的极限状态的选择和随机描述的影响和阻力参数允许基于可靠性的结构响应的评估作为目标的optimization procedure.This项目的目的是开发一个方法框架的鲁棒优化结构响应的随机描述的自然风场的影响下,在各种极限状态。为此,现有的数值模拟程序的基础上的pseudo-threedimensional涡粒子方法与扩展的湍流流入条件和流固耦合进行了扩展,允许计算效率的相关影响的分析。具体地说,风场的随机参数将被再现,结构响应将根据极限状态进行分析,并行模拟将与优化策略相联系。此外,现有的模型用于基于现象的激励机制分析,如准静态气动力系数,旋涡脱落力幅值,Strouhal数,采用Scanlan导数和导纳函数来提高优化效率,并允许流体和结构的解耦。模拟和优化结果的验证和解释将得到风洞实验和包豪斯大学新的数字包豪斯实验室可视化工具的支持。总之,该项目将产生一种有效的方法,在基于极限状态的优化背景下,对暴露于自然风的线状结构进行风激励的并行模拟。这对于结构动力学中的类似问题也是相关的。将使用样本分析来展示该方法改善与各种极限状态相关的空气动力性能的能力。

项目成果

期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Data-driven Aerodynamic Analysis of Structures using Gaussian Processes
  • DOI:
    10.1016/j.jweia.2022.104911
  • 发表时间:
    2021-03
  • 期刊:
  • 影响因子:
    0
  • 作者:
    I. Kavrakov;A. McRobie;G. Morgenthal
  • 通讯作者:
    I. Kavrakov;A. McRobie;G. Morgenthal
Determination of complex aerodynamic admittance of bridge decks under deterministic gusts using the Vortex Particle Method
  • DOI:
    10.1016/j.jweia.2019.103971
  • 发表时间:
    2019-10
  • 期刊:
  • 影响因子:
    4.8
  • 作者:
    I. Kavrakov;T. Argentini;S. Omarini;D. Rocchi;G. Morgenthal
  • 通讯作者:
    I. Kavrakov;T. Argentini;S. Omarini;D. Rocchi;G. Morgenthal
Numerical investigation of the nonlinear interaction between the sinusoidal motion-induced and gust-induced forces acting on bridge decks
  • DOI:
    10.1016/j.jfluidstructs.2022.103680
  • 发表时间:
    2021-09
  • 期刊:
  • 影响因子:
    3.6
  • 作者:
    Samuel Tesfaye;I. Kavrakov;G. Morgenthal
  • 通讯作者:
    Samuel Tesfaye;I. Kavrakov;G. Morgenthal
Prediction of aeroelastic response of bridge decks using artificial neural networks
使用人工神经网络预测桥面气动弹性响应
  • DOI:
    10.1016/j.compstruc.2020.106198
  • 发表时间:
    2020
  • 期刊:
  • 影响因子:
    4.7
  • 作者:
    Kavrakov;Morgenthal;Lahmer
  • 通讯作者:
    Lahmer
Comparison Metrics for Time-Histories: Application to Bridge Aerodynamics
  • DOI:
    10.1061/(asce)em.1943-7889.0001811
  • 发表时间:
    2020-09
  • 期刊:
  • 影响因子:
    0
  • 作者:
    I. Kavrakov;A. Kareem;G. Morgenthal
  • 通讯作者:
    I. Kavrakov;A. Kareem;G. Morgenthal
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Professor Dr. Tom Lahmer其他文献

Professor Dr. Tom Lahmer的其他文献

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{{ truncateString('Professor Dr. Tom Lahmer', 18)}}的其他基金

Dam Alteration Identification by Extended Full-Waveform Inversion and Multiphase XFEM
通过扩展全波形反演和多相 XFEM 识别大坝改造
  • 批准号:
    395192382
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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Investigation on condensed and conjugated structures localized in maclomolar chains of lignin derivatives using photo-excited energy and electron transfers
利用光激发能量和电子转移研究木质素衍生物大分子链中的缩合和共轭结构
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Seismic evaluation of linear civil engineering structures by surface waves excited in the Osaka Plain
大阪平原面波激发的线性土木工程结构的抗震评价
  • 批准号:
    17K06533
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    2017
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    --
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Development of first-principles simulation method for excited-state correlated electron-nuclear dynamics in nano-structures
纳米结构中激发态相关电子核动力学第一性原理模拟方法的发展
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    2016
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Understanding and improving energy dissipation and vibration damping in structures subject to self-excited irregular vibrations – linking data driven approaches with modelling
了解和改善受自激不规则振动影响的结构中的能量耗散和振动阻尼 – 将数据驱动方法与建模联系起来
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Excited-State Properties of Electrostatically Doped Low-Dimensional Structures
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- Development of new quantum chemical methods - Structures and properties of molecules in the excited electronic state
- 新量子化学方法的发展 - 激发电子态分子的结构和性质
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Determination of the energetic position of electronically excited states, their structures and life times
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