Time-domain coupled dynamic simulation for SFT-mooring-train interaction in waves and earthquakes

Jin, Chungkuk; Bakti, Farid P.; Kim, Moo-Hyun

doi:10.1016/j.marstruc.2020.102883

Cited by 32 publications

(9 citation statements)

References 41 publications

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“…@ 2 w @z 2 ð0; tÞ ¼ 0; EI @ 2 w @z 2 ðl; tÞ ¼ 0 (6) wðz; 0Þ ¼ 0; @wðz; 0Þ @t ¼ 0 (7) According to Eqs. ( 6) and ( 7), generalized coordinate q(t) and in turn, vertical displacement w(z, t) could be obtained.…”

Section: Eimentioning

confidence: 99%

“…Due to the complex external environmental conditions of SFTs, there are several dynamic load types during operation period which wave and current around SFT, water flow excitation loads of anchor cables and vehicle loads inside the structure are the most common dynamic loads. In existing research data, the dynamic responses of SFTs under wave and current load [3][4][5], earthquake excitation [6][7][8] and anchor cable flow excitation [9,10] have been investigated through mathematical and physical models [11,12], while the dynamic responses of SFT under vehicle load has rarely been studied. Tariverdilo et al [13] performed simulation analyses on vehicle loads in SFTs considering them as concentrated forces moving longitudinally along pipe body.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on the Dynamic Response of Submerged Floating Tunnels to Wave Currents and Traffic Load

Jiang¹,

Wu²,

Ji³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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Submerged floating tunnel (SFTs) are typically subjected to complex external environmental and internal loads such as wave currents and traffic load. In this study, this problem is investigated through a finite element method able to account for fluid-structure interaction. The obtained results show that increasing the number of vehicles per unit length enhances the transverse vibrational displacements of the SFT cross sections. Under ultimate traffic load condition, one-way and two-way syntropic distributions can promote the dynamic responses of SFTs whereas two-way reverse distributions have the opposite effect.

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Section: Eimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Dynamic Response of Submerged Floating Tunnels to Wave Currents and Traffic Load

Jiang¹,

Wu²,

Ji³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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“…The theory and formulation of the two methods are explained in this section. Detailed formulations regarding the two methods and their validations can be found in Refs [12,21,22] .…”

Section: Theory and Formulationmentioning

confidence: 99%

“…Their considerable dynamic and structural behavior and the resulting large mooring tension are still considered severe under various environmental conditions such as waves, currents, earthquakes, and tsunamis. Many studies adopted the Morison equation [10] for force estimation of the horizontal cylinder [11][12][13] due to low computational cost. However, the Morison equation has limitations in that wavelength should be more than five times the characteristic length ( / 0.2 D L ≤ where D is cylinder diameter and L is wavelength), and the radiation effect is neglected.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Potential Theory and Morison Equation for Deformable Horizontal Cylinders

Jin¹

2022

SUSTAIN MAR STRUCT

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This study investigates the hydro-elastic behaviors of fully submerged horizontal cylinders in different regular waves. Two methods were proposed and compared in this study. The first method was based on potential theory in frequency domain and the discrete-module-beam (DMB) method, which discretizes a floating elastic structure into a sufficient number of rigid bodies while simultaneously representing the elastic behavior from beam elements with Euler-Bernoulli beam and Saint-Venant torsion. Moreover, the Morison method in time domain was employed; this method estimates wave forces from the semi-empirical Morison equation, and the elastic behavior is embodied by massless axial, bending, and torsional springs.Various parametric studies on cylinder diameter, submergence depth, and wave direction were conducted. Wave forces, dry/wet mode shapes/natural frequencies, and dynamic motions are presented and analyzed.

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“…OrcaFlex, a commercial program, is used to model the fully-coupled model, and the detailed theory and methodology is provided by Refs. [5,13,31].…”

Section: Validation Of Frequency-domain Dynamic Simulation Programmentioning

confidence: 99%

Optimization of Tuned Mass Damper for Submerged Floating Tunnel with Frequency-Domain Dynamics Simulation

Jin

Kim

2022

J. Adv. App. Comput. Math.

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In this study, the Tuned Mass Damper (TMD) optimization is carried out to reduce the resonant motion of Submerged Floating Tunnel (SFT) under wave excitations. The SFT dynamics is evaluated in frequency domain; a new approach to cost-effectively optimizing TMD parameters for a moored system is suggested. Discrete-Module-Beam (DMB) method is used to model the Tunnel; mooring lines are included as equivalent stiffness matrix through static-offset tests by the fully coupled model. Since the frequency-domain dynamics simulation model is employed, a significant reduction in optimization time can be achieved. TMD is installed at the tunnel’s mid-length to mitigate the lateral motion of the Tunnel and coupled with the Tunnel with translational and rotational springs and dampers. The optimization process for TMD parameters is performed through the Genetic Algorithm (GA). The GA generates the TMD mass and spring and damping coefficients. The dynamics simulation is performed under wave conditions and this process is repeated until the stopping criteria is satisfied. Results demonstrate that TMD with optimized parameters significantly reduces the lateral motion, especially near the system’s lowest lateral natural frequency. This frequency-domain optimization also works as intended with significantly decreased optimization time.

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Time-domain coupled dynamic simulation for SFT-mooring-train interaction in waves and earthquakes

Cited by 32 publications

References 41 publications

Research on the Dynamic Response of Submerged Floating Tunnels to Wave Currents and Traffic Load

Research on the Dynamic Response of Submerged Floating Tunnels to Wave Currents and Traffic Load

Comparison of Potential Theory and Morison Equation for Deformable Horizontal Cylinders

Optimization of Tuned Mass Damper for Submerged Floating Tunnel with Frequency-Domain Dynamics Simulation

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