权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Vibration Attenuation and Fatigue Analysis of the Large Flexible Articulated Boom under Wind Load and Vortex Shedding

大型柔性铰接臂在风载和涡流作用下的振动衰减和疲劳分析

基本信息

批准号：
513864-2017
负责人：
Sedaghati, Ramin
金额：
$ 1.82万
依托单位：
Concordia University
依托单位国家：
加拿大
项目类别：
Engage Grants Program
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：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=639522
关键词：
Vibration Attenuation Fatigue Analysis Large

项目摘要

This project concerns with vibration attenuation and fatigue analysis of the towers and attached articulatedbooms in response to wind load and vortex shedding. The three-dimensional finite element model of the towersand booms are developed in HyperMesh, Ansys and RISA softwares. A comprehensive vibration analysis isconducted to identify first 10 natural frequencies and corresponding mode shapes of the structure, underdifferent possible booms configurations and loading scenarios. In order to demonstrate accuracy of the model,the results obtained from finite element analysis, in terms of natural frequency of the articulated boom, arecompared with those of the experiment. The experiment has been already conducted by STRUDES and theresults are available. The experimental results along with logarithmic decrement technique and modal analysisare used to extract damping of the structure. The findings obtained from the finite element simulation,experiments and vortex shedding analysis of the booms are used to identify under what circumstances theresonant frequencies of the structure are excited. Furthermore, the boom deflection under resonance excitationis evaluated. At the end, the critical components of the structure subject to fatigue failure, due to cyclic loads,are identified and their fatigue lives are computed to make sure the structure operates properly during 50 years,without any failure. Finally, appropriate vibration damping devices or tuned vibration absorbers will beoptimally designed to mitigate the extreme vibration due to vortex shedding.

该项目关注的是塔和附加铰接臂的振动衰减和疲劳分析，以响应风荷载和旋涡脱落。在HyperMesh、Ansys和RISA软件中建立了塔架和臂架的三维有限元模型。进行了全面的振动分析，以确定不同可能的臂架配置和加载场景下结构的前10个固有频率和相应的模态振型。为了证明模型的准确性，对铰接臂的固有频率进行了有限元分析，并与实验结果进行了比较。该实验已由STRUDES进行，并可获得结果。结合对数减量法和模态分析对结构的阻尼进行了提取。利用有限元模拟、实验和旋涡脱落分析得到的结果来确定在什么情况下结构的共振频率被激发。此外，还计算了共振激励下的臂架挠度。最后，对循环荷载作用下易发生疲劳破坏的关键构件进行了识别，并对其疲劳寿命进行了计算，以确保该结构在50年内正常运行，不发生任何破坏。最后，将优化设计适当的减振装置或调谐减振器，以减轻旋涡脱落引起的极端振动。