Practical approach of linear hydro-elasticity effect on vessel with forward speed in the frequency domain

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

doi:10.1016/j.jfluidstructs.2020.103204

Cited by 21 publications

(3 citation statements)

References 32 publications

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“…where Φ st is the zeroth-order steady velocity potential, it can incorporate the effects of uniform flow. Φ U represents the uniform flow potential, and Φ sB denotes the perturbed steady flow potential arising from the interaction between the uniform flow and the body [42].…”

Section: Potential Theorymentioning

confidence: 99%

Coupled Dynamic Characteristics of a Spar-Type Offshore Floating Two-Bladed Wind Turbine with a Flexible Hub Connection

Wu,

Wang,

Jie

et al. 2024

JMSE

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To reduce manufacturing, transportation, lifting and maintenance costs of increasingly larger and larger floating wind turbines, a Spar-type floating two-bladed wind turbine based on the 5 MW OC3-Hywind floating wind turbine model from the National Renewable Energy Laboratory (NREL) is studied in this paper. The two-bladed wind turbine can cause serious problems with large dynamic loads, so a flexible hub connection was introduced between the hub mount and nacelle carrier to alleviate the dynamic effect. The paper focuses on studying the dynamic responses of the proposed Spar-type floating two-bladed wind turbine with a flexible hub connection at rated and extreme environmental conditions. Fully coupled time-domain simulations are carried out by integrating aerodynamic loads on blades, hydrodynamic loads on the spar, structural dynamics of the tower, blades and mooring lines, control system and flexible hub connection. The analysis results show that the application of a flexible hub connection between the hub mount and nacelle carrier can make a contribution to enable the Spar-type floating two-bladed wind turbine to effectively dampen the motion of the floating platform, while significantly reducing the tower load and blade deflection.

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Section: Potential Theorymentioning

confidence: 99%

Coupled Dynamic Characteristics of a Spar-Type Offshore Floating Two-Bladed Wind Turbine with a Flexible Hub Connection

Wu,

Wang,

Jie

et al. 2024

JMSE

View full text Add to dashboard Cite

show abstract

“…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%

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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“…The DMB method is employed to model the hydro-elasticity of the tunnel. In this method, a very large floating structure is modeled with multiple rigid bodies and beam elements [26][27][28], as shown in Figure 2. Since the details are described in Ref [29], only essential formulas are included in this paper.…”

Section: Submerged Floating Tunnel Modeling In Frequency Domainmentioning

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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Practical approach of linear hydro-elasticity effect on vessel with forward speed in the frequency domain

Cited by 21 publications

References 32 publications

Coupled Dynamic Characteristics of a Spar-Type Offshore Floating Two-Bladed Wind Turbine with a Flexible Hub Connection

Coupled Dynamic Characteristics of a Spar-Type Offshore Floating Two-Bladed Wind Turbine with a Flexible Hub Connection

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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