Nonplanar multi-modal vibrations of fluid-conveying risers under shear cross flows

Jiang, Tianli; Liu, Zhiyuan; Dai, Huliang; Wang, Lin; He, Fulian

doi:10.1016/j.apor.2019.03.015

Cited by 33 publications

(6 citation statements)

References 41 publications

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“…The danger of these oscillations lies in the fact that at certain definite ratios between the natural frequencies of the pipeline oscillations and the excitation frequencies, an unlimited increase in the amplitude of parametric oscillations occurs and a phenomenon of parametric resonance begins. Under conditions of parametric resonance, the structure is subjected to dangerous cyclic effects, which can lead to fatigue failure [2][3][4][5][6][7][8][9][10][11][12]. Parametric resonance of a pipeline was considered by Païdoussis and Issid [13] in the form of a beam with clamped edges; there only the "beam" modes of oscillations were taken into account.…”

Section: Introductionmentioning

confidence: 99%

Simulation of oscillations of composite pipelines conveying pulsating fluid

Komilova

Shakhobiddinova²,

Ismoilov³

et al. 2023

E3S Web Conf.

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The article considers the problem of vibrations of straight sections of the pipeline based on the theory of beams. A mathematical model of the dynamics of a straight viscoelastic pipe with a pulsating fluid is developed. The speed of a pulsating fluid is assumed to be harmonically fluctuating and has the following form: V(t) = υ0 (1 + μ1cosϖt). The mathematical model of the problem is simplified using the Bubnov-Galerkin approach to the solution of a set of common integro-differential equations with time as an independent variable. A numerical approach based on the removal of the singularity in the relaxation kernel of the integral operator is used to solve integro-differential equations. A numerical approach for the unknowns was used to get the system of algebraic equations. The Gauss technique is used to resolve a set of algebraic equations. The dynamics of fluid-transporting viscoelastic pipes have difficulties that can be solved computationally.

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Section: Introductionmentioning

confidence: 99%

Simulation of oscillations of composite pipelines conveying pulsating fluid

Komilova

Shakhobiddinova²,

Ismoilov³

et al. 2023

E3S Web Conf.

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“…Zhang et al (2022) analyzed the lockin frequency, single-frequency mode, and multi-frequency modes of a long-hanged and weighted riser in internal fluid flow and external currents. Jiang et al (2019) studied the coupled frequencies for cross-flow and in-line motions of fluid-conveying risers in uniform cross-flow. Lu et al (2018) predicted a riser's modal shapes and exciting and damping regions of excited modes by a proposed modal-space-based direct method for the prediction of vortex-induced vibration.…”

Section: Introductionmentioning

confidence: 99%

Modal state vectors of a free-hanging drilling riser during deployment and retrieval

Zhou

Chen

et al. 2022

J Petrol Explor Prod Technol

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To prevent marine risers' resonance and eliminate potential threats, sufficient inherent dynamic characteristics such as natural frequency, modal displacement, slope, bending moment, and shear are necessary to be calculated and analyzed. However, most studies calculate the natural frequencies and modal displacements directly rather than the modal slopes and forces. The additional calculations of modal slopes and forces likely result in issue complications, time-consuming, or even errors especially when the boundaries at both ends are solved by a finite difference method. To solve the above problems, a state-vector approach is developed herein based on the precise integration method. Two traditional methods, i.e., differential transformation method and finite element method, are utilized to verify the validation of the approach. The modal state vectors of a marine drilling riser, i.e., not only modal displacements but also modal slopes, bending moments, and shears, are studied in detail under four classic cases according to the hard and soft hang-off modes and the deployment and retrieval processes. Besides, the natural frequencies versus the riser suspension lengths are investigated during the deployment and retrieval. The critical resonance suspension lengths of the riser are discussed via a double-peaked sea irregular wave spectrum. Based on the analyses presented in this study and their generic findings, powerful tools can be designed to prevent riser resonance and associated threats in operation.

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“…Shahali et al [39] investigated the nonlinear dynamic response of a viscoelastic pipe conveying fluid subjected to a uniform external cross flow based on the Euler-Bernoulli theory. e nonplanar vibrations and multimodal responses of pinned-pinned risers in shear cross flow were numerically studied by Jiang et al [40]. Ma et al [41] presented an experimental study of large-amplitude intermittent vibrations of an inclined bendable riser transporting an air-water flow with an unsteady slug-flow pattern.…”

Section: Introductionmentioning

confidence: 99%

Developing a Simplified Method to Investigate the Dynamic Behavior of Fluid Conveying Pipes under Mean Internal Pressure

Atashgah

Iranmanesh

Mojtahedi

2022

Mathematical Problems in Engineering

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Natural frequencies and critical velocities are the basic dynamic characteristics of fluid conveying pipes. Investigation of vibrations of fluid conveying pipes to control their dynamic behavior is one of the main topics of these structures. This paper presents a simplified approach to determine the natural frequencies and critical velocities of fluid conveying pipes with different typical boundary conditions under the mean internal pressure due to the fluid flow. The approach is suggested by reducing the order of mass, damping, and stiffness based on the concepts of the Galerkin method. The results of the method are validated by experimental results and compared with various numerical methods reported in the literature. The effects of mean internal pressure on the natural frequencies of fluid conveying pipes are assessed, and critical pressure values are calculated for the different mode shapes of the pipes. The method presents significantly better results in all the velocities in a range less than the critical flow velocity. Also, the natural frequencies of fluid conveying pipes in the presence and absence of mean internal pressure are calculated by the explicit formulas obtained by the simplified approach. The method has a lower computational cost than other more complex techniques, and its relative errors are less than 5%.

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Nonplanar multi-modal vibrations of fluid-conveying risers under shear cross flows

Cited by 33 publications

References 41 publications

Simulation of oscillations of composite pipelines conveying pulsating fluid

Simulation of oscillations of composite pipelines conveying pulsating fluid

Modal state vectors of a free-hanging drilling riser during deployment and retrieval

Developing a Simplified Method to Investigate the Dynamic Behavior of Fluid Conveying Pipes under Mean Internal Pressure

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