Hydrodynamic forces acting on capsized vessel with geometrical configuration and its towing method

Yukawa, Kazuhiro; Hoshino, Kunihiro; Hara, Shintaro; Yamakawa, Kenji

doi:10.2534/jjasnaoe1968.1999.186_145

Cited by 2 publications

(3 citation statements)

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“…[8][9][10][11][12][13] In this research paper, the effects of nonlinear elastic towrope were not considered. Other researchers [14][15][16][17] have proposed rope models which are of too high order and complex such that they are hard to apply to designing a control system. These rope models were also not considered in this research due to their overly complex nature.…”

Section: Introductionmentioning

confidence: 99%

A study on load position control and vibration attenuation in crane operation using sub-actuator

Lee

Kim

Ji³

et al. 2019

Measurement and Control

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The main purpose of any crane system is to move a load to a specified place. Accurate load positioning in the presence of unpredictable external factors is an important issue when operating a crane. Attenuation of load vibration during crane operation is immensely critical in order to satisfy rigorous requirements for safety and efficiency. When a crane is installed and operated on a vessel at sea, work conditions become even more difficult and thus require more stringent attention to load positioning and attenuation of load vibration. At sea, this process is complicated due to factors such as waves and wind, making accurate crane operation nearly impossible. For these reasons, active heave compensation systems have been developed to suppress the effects of disturbances raised from the harsh sea environment including vessel motions. This paper explores the suppression method of unexpected vertical vibration of load. Unlike past research on the topic, this research includes rope dynamics in the control system design for suppressing load vibration. In addition, this research considers uncertain disturbances—vessel motions not controlled by any active force that result in undesirable heave motion of a crane. Load motion is indirectly estimated using a load cell because we do not yet have any useful tool to measure it directly. In the considered crane system, two winches were used, one for moving the load and the other for suppressing residual vibration. To evaluate the proposed control strategy and system performance, several control techniques were applied: proportional–integral–derivative control, sliding mode control, and feedback linearization control methods.

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Section: Introductionmentioning

confidence: 99%

A study on load position control and vibration attenuation in crane operation using sub-actuator

Lee

Kim

Ji³

et al. 2019

Measurement and Control

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“…Inoue obtained towing cable's disturbance equation and obtained the effects of towing cable's flexibility on ship's course stability by using Routh-Hurwitz discriminant equation. Yukawa [5] used empirical formula to calculate the change of towline tension in the course of ship's movement, he also used empirical formula of angle between towing cable and towed ship to calculate the change of capsized ship's course. Although there were many research results of tug towing, about tug cable's breaking force, little researches were found [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Yukawa [5] used empirical formula to calculate the change of towline tension in the course of ship's movement, he also used empirical formula of angle between towing cable and towed ship to calculate the change of capsized ship's course. Although there were many research results of tug towing, about tug cable's breaking force, little researches were found [3][4][5][6]. The purpose of the present paper is to research influence factors of tug cable's breaking force by using dimension analysis method, so as to provide theoretical reference for safety towage.…”

Section: Introductionmentioning

confidence: 99%

Research on Influence Factors of Tug Cable’s Breaking Force in Narrow Channel

Jiang¹,

Ai²,

Wang³

2018

dtem

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Tug cable directly bears ship's towage force. It is necessary to study influence factors of tug cable's breaking force in narrow channel for towage safety. In the present paper, influence factors of tug cable's breaking force are analyzed by using dimension analysis method. The research results show that tug cable's breaking force is closely related with dynamic coefficient, Newton number, and Mach number. Half experience and half theory formula of tug cable's breaking force can be obtained by regression analysis experiment data.

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Hydrodynamic forces acting on capsized vessel with geometrical configuration and its towing method

Cited by 2 publications

References 1 publication

A study on load position control and vibration attenuation in crane operation using sub-actuator

A study on load position control and vibration attenuation in crane operation using sub-actuator

Research on Influence Factors of Tug Cable’s Breaking Force in Narrow Channel

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