Research on Locally Resonant Characteristics of Pipelines with Periodic Structure

Xingsheng Lao; Yonghua Yu; Fan Zhang; Jinxiao Ye; Xiangxi Xu; Zhaowang Xia

doi:10.3390/mi13060850

Research on Locally Resonant Characteristics of Pipelines with Periodic Structure

Micromachines (Basel). 2022 May 29;13(6):850. doi: 10.3390/mi13060850.

Authors

Xingsheng Lao¹, Yonghua Yu², Fan Zhang³, Jinxiao Ye², Xiangxi Xu², Zhaowang Xia^{2

4}

Affiliations

¹ Science and Technology on Thermal Energy and Power Laboratory, Wuhan 2nd Ship Design and Research Institute, Wuhan 430000, China.
² School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
³ Research and Development Center, China Academy of Launch Vehicle Technology, Beijing 100076, China.
⁴ School of Shipbuilding and Ocean Engineering, Jiangsu Maritime Institute, Nanjing 211000, China.

Abstract

In this paper, the propagation characteristics of vibration waves in periodic pipelines were studied based on the band theory of phononic crystals, and we analyzed the influence of the geometrical structure parameters on the band gap characteristics of pipelines. The results show that, by increasing the number of layers of local resonant structure, both the initial frequency and the cutoff frequency of the band gap moved towards the lower frequency, while the width of the system band gap increased by 35 Hz, and the damping effect increased by 18.3 dB. By changing the thickness of the wall of the pipeline system, the width of the system band gap increased by 20 Hz, and the damping effect increased by 9.1 dB. The maximum vibration isolation of the offshore platform truss based on the periodic structure can be up to 7.93 dB. Therefore, it is feasible to apply the local resonant periodic structure to the vibration control of a practical offshore platform.

Keywords: band gap; local-area; offshore platform; phononic crystals.

Grants and funding

This work supported by the Natural Science Foundation of Jiangsu Province (BK20191462) and Science and Technology on Thermal Energy and Power Laboratory Open Foundation of China (No. TPL2020003).