Introduction

Because the fluid-conveying piping system has a wide range of engineering applications such as mechanical, civil, astronautical and aeronautical engineering and so on, the vibration control is very necessary due to possible damage to the pipe system caused by vibration. This paper presents a vibration reduction scheme of pipeline conveying fluid which can reduce vibration effectively.

Objectives

By coupling the Bragg scattering bandgap mechanism with the inertia amplification mechanism, a strategy to enhance the bandgap properties of the periodic non-uniform pipes conveying fluid is proposed.

Methods

The band structures for flexural waves in the fluid-conveying periodic non-uniform pipes with periodically distributed inertial amplification mechanisms are determined using the transfer matrix method, and the frequency ranges of the bandgaps and vibration reduction are analyzed.

Results

The vibration attenuation capacity of the periodic non-uniform pipes under different fluid velocities, amplification masses and amplification angles is investigated. The bandgaps of the non-uniform pipe conveying fluid with periodic inertial amplification mechanisms obtained by the numerical method are compared with the vibration experiments. The results show that the piping systems with the design of the periodic pipe structures can be effective in reducing vibration.

Conclusion

The fluid velocity has slight effect on the band-gap properties of the non-uniform fluid-conveying pipes with periodic inertial amplification mechanisms. The band-gap properties and vibration attenuation performance of the non-uniform fluid-conveying pipes with periodic inertial amplification mechanisms can be enhanced more efficiently by a larger amplification angle and amplification mass.

中文翻译：

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周期性非均匀管道输送流体的振动衰减

介绍

由于流体输送管道系统在机械、土木、航天和航空工程等工程应用领域广泛，振动可能对管道系统造成损坏，因此振动控制是非常必要的。本文提出了一种能有效降低振动的管道输送流体的减振方案。

目标

通过将布拉格散射带隙机制与惯性放大机制耦合，提出了一种增强周期性非均匀管道输送流体带隙特性的策略。

方法

利用传递矩阵法确定了具有周期性分布的惯性放大机制的流体输送周期性非均匀管道中弯曲波的能带结构，并分析了带隙和减振的频率范围。

结果

研究了周期性非均匀管道在不同流速、放大质量和放大角度下的减振能力。将数值方法得到的具有周期性惯性放大机制的非均匀管道输送流体的带隙与振动实验进行了比较。结果表明，采用周期性管道结构设计的管道系统可以有效地减少振动。

结论

流体速度对具有周期性惯性放大机制的非均匀流体输送管的带隙特性有轻微影响。具有周期性惯性放大机制的非均匀流体输送管的带隙特性和减振性能可以通过更大的放大角度和放大质量更有效地得到增强。