轴力和水压作用下深水输液管道湿模态振动特性分析

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Abstract

A coupled model of submarine pipeline conveying crude oil under axial tension and hydrostatic pressure was established based on the Love-Timoshenko theory and the Helmholtz equation and results of structural natural frequencies were obtained.Compared with those in literature, the results presented were confirmed to be correct.By comparing the natural frequencies under different working conditions, it was found that wet mode analysis is irreplaceable for submarine pipeline vibration analysis.The presence of crude oil and sea water will reduce the natural frequencies, but will not affect the elastic critical pressure.The influence of crude oil constant flow velocity can be ignored.Though parameters analysis, it is found that the boundary conditions and the length-radius ratio have less influence on high circumferential mode frequencies, but greater influence on low ones, especially the fundamental frequency.The axial tension will slightly reduce the natural frequency, and then slightly reduce the elastic critical pressure.Hydrostatic pressure can greatly reduce the natural frequency and even cause structural instability.Therefore, the axial force and hydrostatic pressure should be addressed in the wet mode analysis of submarine pipeline.

Key words： submarine pipeline acoustic-structure coupling wet mode analysis natural frequency initial stress

Received: 17 February 2020 Published: 28 June 2021

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	YU Jianxing1
	2
	LI Zhenmian1
	2
	YU Yang1
	2
	ZHAO Mingren1
	2
	CUI Yupeng1
	2
	ZHAO Yu1
	2
	XU Lixin1
	2

Cite this article:

YU Jianxing1,2,LI Zhenmian1, et al. Wet modal vibration analysis for submarine fluid-conveying pipeline under axial tension and hydrostatic pressure[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(12): 90-96.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I12/90

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