Parametric pitch instability investigation of Deep Draft Semi-submersible platform in irregular waves

Mao, Huan; Yang, Hezhen

doi:10.1016/j.ijnaoe.2015.09.001

Cited by 11 publications

(2 citation statements)

References 8 publications

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“…Some researchers investigated the pitch instability of deep draft semi-submersible drafts in irregular waves, in realistic sea conditions [10]. In the past few years, researchers such as Hong et al [4], Montasir et al [11] and Chen et al [2], have revealed the coupling effects between floating offshore structures and the mooring system. These coupling effects could be predicted in their motion and analyses, in terms of time and frequency [17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Translation Motion Characteristics of Moored Symmetrical Semi-submersible in Regular Waves

Khairuddin¹,

Koto²,

Ain³

et al. 2020

JMechE

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This paper proposes to carry out experiment procedures to investigate the translation motion characteristics of symmetrical semi-submersibles in long crest regular waves. The hydrodynamic response of floating structures in waves is required to be modelled correctly to ensure stability and safety. The symmetrical semi-submersible model was constructed based on a scale ratio of 1:81 in this experiment and was installed with horizontal mooring lines in a wave dynamic basin. This paper also discusses the model preparation procedures, including the mooring lines setup, instrument setup and experiment setup, before conducting the experiment. According to the experiment data, the symmetrical moored semi-submersible experienced wave frequency motion and slow varying motion due to drift force and mooring lines for sway motion; while the heave and surge motion only experienced wave frequency motion.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Translation Motion Characteristics of Moored Symmetrical Semi-submersible in Regular Waves

Khairuddin¹,

Koto²,

Ain³

et al. 2020

JMechE

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“…In the literature there are only a small number of papers, see above, which address motion control systems for USVs, where one option would be consider the use of a proportional plus integral plus derivative (PID) controller. According to some other kinds of underwater vehicles control, it is possible to develop a linear state-space model for depth control law design but there is a high degree of uncertainty associated with the model coefficients and also it is strongly coupled to the surge speed [24]. In the first set of sea trials, it is dispirited that the performance of an auto-tuned PID controller is evaluated because of the disappointed control performances of vertical plane control.…”

Section: Introductionmentioning

confidence: 99%

Experimentally Verified Depth Control of an Unmanned Semi-Submersible Vehicle

Zhou

Liu

et al. 2019

IEEE Access

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This paper considers the control of one unmanned semi-submersible vehicle (USV), named BQ-01, where the submersible depth cannot exceed a few meters in the presence of environmental disturbances. Consequently, the depth control performance measures and the rejection of disturbances, such as those due to sea waves, must be within pre-determined ranges to ensure maximum use of such vehicles. This paper develops a control scheme that combines the state feedback control and rule-based supervision for depth control, where the entries in the feedback control matrix are adjusted by rules formulated from the state errors in the USV diving plane. Surge speed also plays an important role in adjusting control parameters because of its coupled relationship with the state depth of the diving plane. The results from sea trials are given and confirm the potential of the design.INDEX TERMS Depth control performance, feedback control, rule-based supervision, unmanned semisubmersible vehicle.

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Dynamic Analysis of Semi-submersible Under the Postulated Failure of Restraining System with Buoy

2020

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Parametric pitch instability investigation of Deep Draft Semi-submersible platform in irregular waves

Cited by 11 publications

References 8 publications

Experimental Study on Translation Motion Characteristics of Moored Symmetrical Semi-submersible in Regular Waves

Experimental Study on Translation Motion Characteristics of Moored Symmetrical Semi-submersible in Regular Waves

Experimentally Verified Depth Control of an Unmanned Semi-Submersible Vehicle

Dynamic Analysis of Semi-submersible Under the Postulated Failure of Restraining System with Buoy

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