Investigation of a ship’s hydroelasticity and seakeeping performance by means of large-scale segmented self-propelling model sea trials

Jia, Jiao; Ren, Huilong; Sun, Shuzheng; Adenya, Christiaan Adika

doi:10.1631/jzus.a1500218

Cited by 12 publications

(7 citation statements)

References 3 publications

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“…the value corresponding to the peak of probability density curve of formula (15). Usually β=0.01 is selected in engineering applications.…”

Section: Short-term Extreme Distribution With Statistical Modelmentioning

confidence: 99%

“…However, in the authors' previous researches the ships were designed as rigid hulls, which could not reflect the elastic effects of ship girders. Furthermore, according to the authors' best knowledge, so far, there has been very little published literature related to the wave loads experiments performed using a large-scale segmented model in coastal sea [14][15].…”

Section: Introductionmentioning

confidence: 99%

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Predictions of Wave Induced Ship Motions and Loads by Large-Scale Model Measurement at Sea and Numerical Analysis

Jiao¹,

Sun²,

Ren³

2016

brod

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SummaryIn order to accurately predict wave induced motions and load responses of ships, a new experimental methodology is proposed. The new method includes conducting tests with largescale models under natural environment conditions. The testing technique for large-scale model measurements proposed is quite applicable and general to a wide range of standard hydrodynamic experiments in naval architecture. For the needs of this study, a large-scale segmented self-propelled model was designed for investigating seakeeping performance and wave load behavior and for testing the systems, and relevant experiments were performed. A two-hour voyage trial of the large-scale model in order to perform a series of simulation exercises was carried out at Huludao harbor in October 2014. During the voyage, onboard systems, operated by the crew, were used to measure and record the sea waves and the model responses. The post-voyage analysis of the measurements, both of the sea waves and the model's responses, was made to predict the ship's motion and load responses of short-term at the corresponding sea state. Furthermore, the numerical analysis of the short-term prediction was made using an in-house code and the result was compared with the experiment data. The long-term extreme prediction of motions and loads was also carried out based on the numerical results of the short-term prediction.

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“…the value corresponding to the peak of probability density curve of formula (15). Usually β=0.01 is selected in engineering applications.…”

Section: Short-term Extreme Distribution With Statistical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predictions of Wave Induced Ship Motions and Loads by Large-Scale Model Measurement at Sea and Numerical Analysis

Jiao¹,

Sun²,

Ren³

2016

brod

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show abstract

“…The apparatus mainly includes GPS device, propulsion system, autopilot system, and a data recorder. Framework of the testing system is shown in Figure 7 and the subsystems are generally concluded below [18,19].…”

Section: Testing Systemmentioning

confidence: 99%

Experimental Investigation of Wave-Induced Ship Hydroelastic Vibrations by Large-Scale Model Measurement in Coastal Waves

Jia

Ren

Sun

et al. 2016

Shock and Vibration

Self Cite

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Ship hydroelastic vibration is an issue involving mutual interactions among inertial, hydrodynamic, and elastic forces. The conventional laboratory tests for wave-induced hydroelastic vibrations of ships are performed in tank conditions. An alternative approach to the conventional laboratory basin measurement, proposed in this paper, is to perform tests by large-scale model measurement in real sea waves. In order to perform this kind of novel experimental measurement, a large-scale free running model and the experiment scheme are proposed and introduced. The proposed testing methodology is quite general and applicable to a wide range of ship hydrodynamic experimental research. The testing procedure is presented by illustrating a 5-hour voyage trial of the large-scale model carried out at Huludao harbor of China in August 2015. Hammer tests were performed to identify the natural frequencies of the ship model at the beginning of the tests. Then a series of tests under different sailing conditions were carried out to investigate the vibrational characteristics of the model. As a postvoyage analysis, load, pressure, acceleration, and motion responses of the model are studied with respect to different time durations based on the measured data.

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“…Jiao [1] made a detailed review on the experimental study of ship hydroelasticity. The segmented ship model experiment has become the main method to study the ship hydroelasticity [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Non-Linear Ship Hydroelasticity by CFD-FEM Coupling Method

Sun

Liu

Zou

et al. 2021

JMSE

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With the increase of ship size, the stiffness of the hull structure becomes smaller. This means that the frequency of wave excitation tends to be closer to the natural frequency of the hull vibration, which in turn makes the hydroelastic responses more significant. An accurate assessment of the wave loads and motion responses of hulls is the key to ship design and safety assessment. In this paper, the coupled CFD (Computational Fluid Dynamics)-FEM (Finite Element Method) method is used to investigate the non-linear hydroelasticity effect of a 6750-TEU (Twenty-foot Equivalent Unit) container ship. First, by comparing the heave, pitch, and vertical bending moment at midship section (VBM4) against experimental results reported in the literature, the validity of the numerical method in this paper is illustrated. Secondly, the ship responses under different wave length–ship length ratio, wave frequency-structure natural frequency, wave steepness, and ship speeds are studied. It is found that the wave length–ship length ratio has a more important influence on the hydroelastic response than that from wave frequency-structure natural frequency ratio, and the effect of wave non-linearity will behave differently under different wave length–ship length ratio. The increase of rigid body motion caused by forward speed will not correspondingly increase the non-linearity of the hydroelastic response.

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Investigation of a ship’s hydroelasticity and seakeeping performance by means of large-scale segmented self-propelling model sea trials

Cited by 12 publications

References 3 publications

Predictions of Wave Induced Ship Motions and Loads by Large-Scale Model Measurement at Sea and Numerical Analysis

Predictions of Wave Induced Ship Motions and Loads by Large-Scale Model Measurement at Sea and Numerical Analysis

Experimental Investigation of Wave-Induced Ship Hydroelastic Vibrations by Large-Scale Model Measurement in Coastal Waves

Investigation of Non-Linear Ship Hydroelasticity by CFD-FEM Coupling Method

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