Introducing and analyzing a periodic pipe-in-pipe model for broadband ultra-low-frequency vibration reduction in fluid-conveying pipes

IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Mohammad Hajhosseini
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引用次数: 0

Abstract

A new model of periodic structure is proposed and analyzed. This structure is composed of an inner fluid-conveying pipe with periodic material arrangement carrying periodic arrays of outer cantilever pipes. The generalized differential quadrature rule (GDQR) method combined with the Bloch theorem is used to calculate the vibration band gaps of the structure. Results are verified by the forced vibration responses obtained using the GDQR method. Results indicate that the first two band gaps of the fluid-conveying pipe with periodic material arrangement can get close to each other and move to low frequency regions by changing the length of cantilever pipes. For high fluid velocity values in which the first band gap starts from zero frequency, since the second band is very close to the first band, this periodic structure can be used for vibration reduction over a wide band gap starting from zero frequency. Based on these results, it can be concluded that instead of increasing the total size of the periodic structure, these periodic arrays of cantilever pipes can be implemented to create a wide ultra-low-frequency band gap. Finally, verification of the GDQR method shows that it can be used as a precise numerical method for vibration analysis of the structures such as fluid-conveying pipes and moving belts.

引入并分析用于降低流体输送管道宽带超低频振动的周期性管中管模型
本文提出并分析了一种新的周期性结构模型。该结构由具有周期性材料排列的内流体输送管和周期性排列的外悬臂管组成。采用广义微分正交规则(GDQR)方法结合布洛赫定理计算该结构的振动带间隙。使用 GDQR 方法获得的强迫振动响应对结果进行了验证。结果表明,通过改变悬臂管的长度,具有周期性材料排列的流体输送管的前两个频带间隙可以相互靠近并移动到低频区域。对于第一频带隙从零频率开始的高流体速度值,由于第二频带与第一频带非常接近,这种周期性结构可用于减小从零频率开始的宽频带隙的振动。基于这些结果,我们可以得出结论,与其增加周期性结构的总尺寸,不如采用这些悬臂管周期性阵列来创建一个宽的超低频带隙。最后,对 GDQR 方法的验证表明,它可以作为一种精确的数值方法,用于流体输送管道和移动皮带等结构的振动分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Mechanica Sinica
Acta Mechanica Sinica 物理-工程:机械
CiteScore
5.60
自引率
20.00%
发文量
1807
审稿时长
4 months
期刊介绍: Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics
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