On the Nonlinear Vibrational Responses of a Large Vessel with a Broad Bow Flare under Wave Excitation: Theory and Experiment

Yu, Haisheng; Xu, Yi; Li, Tiange

doi:10.1155/2018/7054768

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…For simplification, the flexible hull girder is described by a 1D nonuniform Timoshenko beam. e combination of 1D beam theory with 3D BEM turned out to be applicable and reliable for ship hydroelastic analysis as a compromise between the calculation accuracy and efficiency [32]. In the following illustrative theoretical calculation, only the first three order vertical bending modes are considered for the ship in head waves.…”

Section: Vibration Mode Analysismentioning

confidence: 99%

“…e comparative bow-flare slamming pressures at positions of sensor nos. 1 and 2 ( Figure 6) in the severe wave condition (V � 18 knots; H � 12 m; λ/L � 0.8) by the generalized Wagner theory calculation [32] and measurement are shown in Figure 27. In the numerical simulation, the hull girder is, respectively, assumed to be rigid and flexible in order to investigate the influence of hull elasticity on slamming pressure responses.…”

Section: Slamming Pressurementioning

confidence: 99%

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Theoretical and Experimental Study on Nonlinear Hydroelastic Responses and Slamming Loads of Ship Advancing in Regular Waves

Jia

Zhao

et al. 2018

Shock and Vibration

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Wave loads estimation and structural strength evaluation are the fundamental work at the ship design stage. The hydroelastic responses and slamming strength issues are also concerned especially for large-scale high-speed ships sailing in harsh waves. To accurately predict the wave-induced motions and loads acting on the ship sailing in regular waves, a fully coupled 3D time-domain nonlinear hydroelasticity theory is developed in this paper. The vibration modal characteristics of the flexible hull structure derived by the 3D finite element method (FEM) and simplified 1D nonuniform Timoshenko beam theory are firstly described. The hydrostatic restoring force and hydrodynamic wave force are calculated on the real-time wetted surface of hull to address geometric nonlinearity due to the steep wave and large amplitude motions. The bow slamming and green water loads acting on the ship in severe regular waves are estimated by the momentum impact method and dam-breaking method, respectively. Moreover, a small-scaled segmented ship model is designed, constructed, and tested in a laboratory wave basin to validate the hydroelasticity algorithm. The results predicted by theoretical and experimental approaches are systemically compared and analyzed. Finally, future work for predictions of ship hydroelasticity and slamming loads in irregular waves is prospected.

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Section: Vibration Mode Analysismentioning

confidence: 99%

Section: Slamming Pressurementioning

confidence: 99%

Theoretical and Experimental Study on Nonlinear Hydroelastic Responses and Slamming Loads of Ship Advancing in Regular Waves

Jia

Zhao

et al. 2018

Shock and Vibration

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“…The stiffener (intermediate elastic support) will significantly affect the structural response frequency and deformation. Yu et al [21] developed a fully coupled nonlinear three-dimensional hydroelastic method to study the vibration response of large ships. The numerical model consists of three-dimensional boundary element method, one-dimensional Euler-Bernoulli beam model and two-dimensional generalized Wagner model.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of green water loads on a fixed structure with elastic sidewalls by MPS-FEM coupled method

Yang

Zhao

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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In rough seas, large masses of water will exceed the freeboard and cause violent slamming on the deck, known as green water. Due to its high destructive power, many scientists have devoted themselves to the study of green water. Given the complexity, various simplified methods have been used to study the mechanism and stresses of green water. In this paper, the loads and patterns of green water events on a fixed structure with rigid or flexible sidewalls were investigated using the solver MPSFSI-SJTU based on the Moving Particle Semi-Implicit (MPS) method coupled with the Finite Element Method (FEM). The rapid flow-structure interaction is generated by the wet dam-break method. Firstly, the numerical simulation of the water shipping events with the rigid structure was carried out, which was in good agreement with the existing numerical simulation results. Secondly, numerical simulations were carried out for different cases of fixed structures with elastic side wall and elastic upper wall. The influence of elastic modulus on wave loads and waveform was analyzed.

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“…Moreover, the rapid response capability and the precision strike capability in high sea states are required in modern sea warfare. In other words, the excellent seakeeping performance for modern ships is required [ 1 ]. High-speed vessels, especially wave piercing catamarans (WPC) have drawn extensive attention for their good performances.…”

Section: Introductionmentioning

confidence: 99%

Design ride control system using two stern flaps based 3 DOF motion modeling for wave piercing catamarans with beam seas

et al. 2019

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A ride control system (RCS) based linear quadratic regulator (LQR) and genetic algorithm (GA) design is presented, to reduce the heave, roll and pitch motion (three degrees of freedom motion (3 DOF motion)) of the wave piercing catamarans (WPC) in beam waves. A detailed 3 DOF ride control model which consists of the coupling and decoupling relationships between longitudinal and transverse motion is proposed for the WPC vessel. And the complex hydrodynamic coefficients and disturbances induced by beam waves are analyzed. Moreover, two stern flaps are designed for the system in the way of alternate flapping. In the controller design, the LQR method based on GA method is adopted to reduce the 3 DOF motion of the ship. Depending on the robust search mechanism and global optimum of GA, weighting parameters can be obtained to calculate the desired gain. Finally, the motion reduction and motion sickness incidence (MSI) results demonstrate the feasibility and effectiveness of the proposed controller, and the comfort of passengers and crews can also be improved.

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On the Nonlinear Vibrational Responses of a Large Vessel with a Broad Bow Flare under Wave Excitation: Theory and Experiment

Cited by 4 publications

References 11 publications

Theoretical and Experimental Study on Nonlinear Hydroelastic Responses and Slamming Loads of Ship Advancing in Regular Waves

Theoretical and Experimental Study on Nonlinear Hydroelastic Responses and Slamming Loads of Ship Advancing in Regular Waves

Numerical study of green water loads on a fixed structure with elastic sidewalls by MPS-FEM coupled method

Design ride control system using two stern flaps based 3 DOF motion modeling for wave piercing catamarans with beam seas

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