Analysis of the vortex induced vibrations on chimney and effect of variable stiffness guy cable vortex induced vibrations on the chimney wake region under different forcing functions to reduce the vibrations of chimney
Analysis of the vortex induced vibrations on chimney and effect of variable stiffness guy cable vortex induced vibrations on the chimney wake region under different forcing functions to reduce the vibrations of chimney
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DOI：
10.1109/ibcast.2018.8312209
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
M. Nawaz;Nadeem Shafi;Bilal Amin;B. Ali
中科院分区：
文献类型：
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作者：
M. Nawaz;Nadeem Shafi;Bilal Amin;B. Ali
涡激振动对与空气等流动流体接触的物体有重要影响。这些振动会对烟囱结构造成严重的破坏，因此对烟囱的涡激振动进行了分析，并采用拉索涡激振动来减小烟囱的振动。为此，利用计算机软件对不同的强迫函数进行了分析，并对所得结果进行了解释，以便设计出更稳定的结构。此外，还改变了刚度，并分析了其对响应幅值和相角的影响。此外，还对拉索振动给予了应有的重视，并分析了拉索振动对烟囱减振和涡流形态的影响。这一切都是通过考虑一个有四个自由度的系统来完成的。此外，通过分析得到了合理的结果，从而得出了减小涡激振动的方法。这在实际应用中具有重要的意义，因为涡激振动是导致结构倒塌的原因，这种振动要么是通过疲劳产生的，要么是通过产生称为鸣叫的低幅度和高频振动来实现的。因此，在施工前应利用涡激振动的概念对结构进行分析，以获得用于施工的材料的优化参数，以减少涡激振动。
Vortex induced vibrations has an important effect on the objects which are in contact with moving fluids such as air. These vibrations can damage the structure severely so an analysis of the vortex induced vibrations of chimney has been done along with the guy cable vortex induced vibrations used to minimize the vibrations of chimney. For this purpose an analysis has been done for the system using computer softwares for different forcing functions and results obtained are then interpreted so that a more stable structure can be designed. Moreover stiffness has also been varied and its effect on the amplitude and phase angle of response has been analyzed. Moreover guy cable vibrations are given due importance and it has been analyzed that how it can reduce the vibrations of chimney and distort its vortex pattern. This all has been done by considering a system having four DOFs. Moreover reasonable results are obtained from the analysis and hence methods for reducing the vortex induced vibrations can be concluded from the research. This is of great significance in practical applications because vortex induced vibrations are responsible for the collapsing of structures either through fatigue or generation of low amplitude and high frequency vibrations called as singing. So an analysis should be done for the structure before its construction using the concept of vortex induced vibrations to obtain optimized parameters for the materials used for construction purposes for the reduction in vortex induced vibrations.