Experimental investigation of vortex-induced vibrations of long free spans near seabed

Li, Xiaochao; Wang, Yongxue; Li, Guangwei; Jiang, Meirong; He, Xiaoxiao

doi:10.1007/s11431-010-4258-z

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…Thereafter, the second increase and reduction of amplitudes occur with a lock-in of the increased vibration frequency, corresponding to the second-mode dominant response. This feature of a mode transition is in consistent with the results in Li et al (2011Li et al ( , 2013.…”

Section: Resultssupporting

confidence: 92%

“…When the flexible pipe is in the proximity to the plane boundary, the occurrence of predominant mode is significantly altered in both directions. In the cross-flow direction, the onset of the second-mode dominant response is shifted to a higher Ur = 13.85, coinciding with the observation of Li et al (2011Li et al ( , 2013. In the in-line direction, the appearance of the second-mode dominant response is transferred to Ur = 9.36 whereas the third-mode one disappears in the considered Ur range.…”

Section: Resultssupporting

confidence: 74%

“…As in elastically mounted rigid cylinder cases, the oval-shape orbital motion was also observed byTsahalis and Jones (1981) andTsahalis (1984) for a near-wall flexible cylinder at G/D = 1.0. In the experiments ofLi et al (2011) who considered a cylinder with the aspect ratio of about 162, a transition from the fundamental response mode to the second one was observed at G/D = 4, 6 and 8.…”

mentioning

confidence: 96%

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Experimental investigation on vortex-induced vibration and solid-structure impact of a near-bottom horizontal flexible pipeline in oblique shear flow

Zhu

Zhao

Srinil

2021

Journal of Fluids and Structures

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 74%

mentioning

confidence: 96%

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Experimental investigation on vortex-induced vibration and solid-structure impact of a near-bottom horizontal flexible pipeline in oblique shear flow

Zhu

Zhao

Srinil

2021

Journal of Fluids and Structures

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“…The fast development of economics promotes the urbanization of China. More and more high-rises appear in our cities [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In order to ensure the service life and security of constructional works, it is necessary to monitor the constructional work systematically during its building and operating.…”

mentioning

confidence: 99%

Dynamic prediction of building subsidence deformation with data-based mechanistic self-memory model

Wang

Hou

et al. 2012

Chin. Sci. Bull.

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This paper describes a building subsidence deformation prediction model with the self-memorization principle. According to the non-linear specificity and monotonic growth characteristics of the time series of building subsidence deformation, a data-based mechanistic self-memory model considering randomness and dynamic features of building subsidence deformation is established based on the dynamic data retrieved method and the self-memorization equation. This model first deduces the differential equation of the building subsidence deformation system using the dynamic retrieved method, which treats the monitored time series data as particular solutions of the nonlinear dynamic system. Then, the differential equation is evolved into a difference-integral equation by the self-memory function to establish the self-memory model of dynamic system for predicting nonlinear building subsidence deformation. As the memory coefficients of the proposed model are calculated with historical data, which contain useful information for the prediction and overcome the shortcomings of the average prediction, the model can predict extreme values of a system and provide higher fitting precision and prediction accuracy than deterministic or random statistical prediction methods. The model was applied to subsidence deformation prediction of a building in Xi'an. It was shown that the model is valid and feasible in predicting building subsidence deformation with good accuracy. The fast development of economics promotes the urbanization of China. More and more high-rises appear in our cities [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In order to ensure the service life and security of constructional works, it is necessary to monitor the constructional work systematically during its building and operating. Due to the diversity, complexity and non-deterministic characters of inducing factors of the building subsidence deformation, the mechanical behavior and deformation trend of building subsidence also reflect non-linear characteristics with the coexistence of the uncertainty and randomness [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Existing methods for building subsidence deformation prediction usually establish the time series analysis model by utilizing monitored data [35][36][37][38][39][40]. However, most of these models are of the "parameter model" class which may not have clear physical meaning of parameters and discard effective parts of monitoring data. On the basis of the retrieved modeling, self-memorization principle has been recently developed based on the mechanism of time series data. As a mathematic realization on integration of deterministic and random theory, the self-memory model is a statistical-dynamical method to solve problems in nonlinear dynamic systems [41][42][43]. The core method of the model is to transform differential equations into difference-integral equations by introduction of the self-memory function. For dynamic systems described by differential equations, pre...

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“…Model tests [10][11][12][13][14][15][16][17] allow a better understanding of multi-mode behaviors of long slender cylinders. The requirements of these tests consist of large aspect ratio of the cylinder, high sampling rates and careful time synchronization for measurement systems.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of dual-resonant and non-resonant responses for vortex-induced vibration of a long slender cylinder

Wei

Hong

2014

Sci. China Phys. Mech. Astron.

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Experimental results of the dual-resonant and non-resonant responses are presented for vortex-induced vibrations (VIV) of a long slender cylinder. The cylinder has a diameter of 10mm and a length of 3.31 m, giving an aspect ratio of 331. The cylinder was towed by a carriage with the velocity up to 1.5 m/s, with the Reynolds number varying from 2500 to 38000. Three different weights were used to provide the initial tension. Dual resonance means that resonance occurs simultaneously in both the cross-flow (CF) and in-line (IL) directions. The experiments were conducted in two stages. At the first stage, dual-resonant dynamic features of the cylinder subjected to vortex-induced excitation were investigated. The features of CF and IL vibration amplitude, motion orbits, phase angle differences, dominant frequencies and mode order numbers are presented. At the second stage of the experiments, particular emphasis was placed on non-resonant dynamic features. The variation of multi-mode modal displacement amplitudes was investigated in detail.

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Experimental investigation of vortex-induced vibrations of long free spans near seabed

Cited by 11 publications

References 11 publications

Experimental investigation on vortex-induced vibration and solid-structure impact of a near-bottom horizontal flexible pipeline in oblique shear flow

Experimental investigation on vortex-induced vibration and solid-structure impact of a near-bottom horizontal flexible pipeline in oblique shear flow

Dynamic prediction of building subsidence deformation with data-based mechanistic self-memory model

An experimental investigation of dual-resonant and non-resonant responses for vortex-induced vibration of a long slender cylinder

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