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.

该项目涉及对塔的振动衰减和疲劳分析，并响应于风负荷和涡流脱落而附加的关注燃料。塔和吊杆的三维有限元模型是在HyperMesh，ANSYS和RISA软件中开发的。一项全面的振动分析是识别结构的前10个固有频率和相应模式形状，可能不变的繁荣配置和加载方案的相应模式。为了证明模型的准确性，从有限元分析中获得的结果是根据铰接式繁荣的固有频率而获得的，并符合实验的均值。该实验已经由Strudes进行，并且可以使用。实验结果以及对数减少技术和模态分析用于提取结构阻尼。从有限元仿真，实验和涡旋分析分析中获得的发现用于识别在结构的何种情况下。此外，评估了共振激发下的动臂挠度。最后，由于循环负荷而导致的结构的关键组成部分，并计算出其疲劳寿命，以确保该结构在50年内正常运行，而不会发生任何故障。最后，适当的振动阻尼装置或调整的振动吸收器将以涡旋脱落引起的极端振动而设计。