Understanding vortex-induced vibration characteristics of a long flexible marine riser by a bidirectional fluid–structure coupling method

Han, Xiaochun; Wang, Lin; Qiu, Ang; Feng, Zhiqiang; Wu, Jiaming; Tang, Youhong; Zhao, Chengtian

doi:10.1007/s00773-019-00663-y

Cited by 15 publications

(8 citation statements)

References 45 publications

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“…Based on the variational principle or weighted residual method, a linear combination of element basis functions is used to approximate the true solution in the element (Zhu, 2019). The general control method for structural dynamics is as follows (Han et al, 2020):…”

Section: Solid Modelmentioning

confidence: 99%

Research on vibration characteristics of rocket engine flow pipeline

Yong,

Wu-Qi

2024

AEAT

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Purpose Abnormal vibrations often occur in the liquid oxygen kerosene transmission pipelines of rocket engines, which seriously threaten their safety. Improper handling can result in failed rocket launches and significant economic losses. Therefore, this paper aims to examine vibrations in transmission pipelines. Design/methodology/approach In this study, a three-dimensional high-pressure pipeline model composed of corrugated pipes, multi-section bent pipes, and other auxiliary structures was established. The fluid–solid coupling method was used to analyse vibration characteristics of the pipeline under various external excitations. The simulation results were visualised using MATLAB, and their validity was verified via a thermal test. Findings In this study, the vibration mechanism of a complex high-pressure pipeline was examined via a visualisation method. The results showed that the low-frequency vibration of the pipe was caused by fluid self-excited pressure pulsation, whereas the vibration of the engine system caused a high-frequency vibration of the pipeline. The excitation of external pressure pulses did not significantly affect the vibrations of the pipelines. The visualisation results indicated that the severe vibration position of the pipeline thermal test is mainly concentrated between the inlet and outlet and between the two bellows. Practical implications The results of this study aid in understanding the causes of abnormal vibrations in rocket engine pipelines. Originality/value The causes of different vibration frequencies in the complex pipelines of rocket engines and the propagation characteristics of external vibration excitation were obtained.

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Section: Solid Modelmentioning

confidence: 99%

Research on vibration characteristics of rocket engine flow pipeline

Yong,

Wu-Qi

2024

AEAT

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“…The hydrodynamic performance of the soft-bodied bionic wing fin is further determined by analyzing the distribution of pressure and vorticity in the basin. [60,61] To study the hydrodynamic numerical simulation of bionic wing fin, in addition to setting the periodic motion time, motion control equation, and material constitutive model given above, the simulation environment should be configured. The main parameters are shown in Table 2.…”

Section: Bidirectional Fluid-structure Coupling Numerical Simulation ...mentioning

confidence: 99%

“…The hydrodynamic performance of the soft‐bodied bionic wing fin is further determined by analyzing the distribution of pressure and vorticity in the basin. [ 60,61 ]…”

Section: Dynamic Performance Analysis Of Pneumatic Soft‐bodied Bionic...mentioning

confidence: 99%

Development and Performance Analysis of Pneumatic Soft‐Bodied Bionic Flipper

Zhao

Lim

et al. 2022

Adv Eng Mater

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The sea lion fore flipper has superior underwater movement performance. Its structural characteristics and propulsion mechanism are drawn, combined with the large deformation and hyperelastic properties of silicone, a pneumatic soft‐bodied bionic flipper with strong underwater mobility, good environmental adaptability, and flexible attitude transformation. Based on Yeoh's second‐order constitutive model of silicone, the nonlinear dynamic analysis of the main limb of the bionic flipper is carried out, and the deformation analysis theoretical model is established. Then, the force analysis of infinitesimal and integral of the wing fin of the bionic flipper is analyzed by the blade element theory, to obtain the theoretical model of underwater propulsion dynamic performance. The superiority of the hydrodynamic performance of the bionic flipper is analyzed and confirmed using the bidirectional fluid–structure coupling numerical simulation algorithm. An experimental test platform is built to test the physical model of the bionic flipper. The motion and dynamic characteristics curves of the bionic flipper are obtained and compared with the corresponding numerical simulation results. The results show that the theoretical model and numerical simulation are accurate, and the structure is feasible, which can provide methods and references for the research and implementation of the underwater propeller.

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“…Here, F(x, t) denotes the external force acting upon the system. The governing equation of motion can be obtained from integrating equation (7) and substituting it in equation (6) as follows:…”

Section: Kinematicmentioning

confidence: 99%

“…The application of fluctuating force may cause the object to vibrate if it is supported by an elastic support and the object's flexibility is low. If the vibrating force is not restrained, the structure may be damaged [7,8]. As an example, these forces cause unwanted and undesirable oscillations in the soft robot arm and marine robots [9], resulting in a reduction of the accuracy of its performance and its control will be made more complicated accounting for the fact that the floating-base of the robot will also be subject to some disturbance.…”

Section: Introductionmentioning

confidence: 99%

A semi-analytical study on fluid-induced nonlinear dynamic behavior of the flexible robotic arms

Chen

Qiu

2022

Eng. Res. Express

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The accuracy and performance of a robot arm is reduced when placed in a fluid environment due to inductive vibrations caused by drag forces created by surrounding fluids. Accordingly, in this research, the fluid-induced nonlinear dynamic behavior of the robot flexible arm is investigated semi-analytically. In order to model the induced vibrations in the robot arm, the equations governing the transverse vibrations of the arm are derived using the nonlinear Euler-Bernoulli beam theory and taking into account the force due to the fluid surrounding the arm. A differential equation is used to calculate the force exerted on the arm by the surrounding fluid in terms of the frequency of the vortices and the deflection of the robotic arm. After the differential equations governing the forced dynamic behavior of the robot arm have been extracted, an appropriate numerical method will be applied to analyze the effect of system parameters such as the geometric and mechanical characteristics of the arm, fluid velocity, etc. on the response of forced vibrations and natural frequencies of the robot arm. According to the results, as the fluid velocity increases, the inertial forces increase and cannot be ignored. The vibrations amplitude of the system increases abruptly at higher fluid velocity, and the oscillations of the system stabilize. When the nondimentional velocity of the fluid is equal to 2, the amplitude of the stable oscillations is equal to 0.2 of the thickness of the arm, which is higher than the amplitude of free vibrations. This range of fluid velocity is known as the lock-in zone.

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Understanding vortex-induced vibration characteristics of a long flexible marine riser by a bidirectional fluid–structure coupling method

Cited by 15 publications

References 45 publications

Research on vibration characteristics of rocket engine flow pipeline

Research on vibration characteristics of rocket engine flow pipeline

Development and Performance Analysis of Pneumatic Soft‐Bodied Bionic Flipper

A semi-analytical study on fluid-induced nonlinear dynamic behavior of the flexible robotic arms

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