A study on the structural strength of ships in collision

Arita, M.

doi:10.1007/bf01528747

Cited by 3 publications

(6 citation statements)

References 4 publications

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“…The large-scale experiments of Arita [25] (National Maritime Research Institute) were the only ones with all the necessary information. Even though in his experiment, a full- The formula of the Japan Road Association [16] overestimates the experimental values.…”

Section: Shipmentioning

confidence: 99%

Applicability of Calculation Formulae of Impact Force by Tsunami Driftage

Yamamoto

Kozono

Mas

et al. 2021

JMSE

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The aftermath of the Indian Ocean tsunami on 26 December 2004 triggered by the off Sumatra earthquake (magnitude “M” = 9.1), and the Great East Japan earthquake of 11 March 2011 off the Pacific coast of Tohoku (M = 9.0), evidence the secondary damage from driftage collision due to large tsunami waves. To prevent this type of damage, the establishment of methods for predicting driftage movement and calculating the impact force by driftage is necessary. Several numerical models have been developed to predict the driftage movement of objects. Every year, these improve in accuracy and usability. In contrast, there are many calculation formulae for calculating the impact force. However, since there are considerable differences between values calculated using these formulae, the reliability of each formula is unknown. Therefore, in this research, one team of the committee on tsunami research of the Japan Society of Civil Engineers summarizes the main calculation formulae of impact forces that have been proposed until 2019. In addition, for each type of driftage (driftwood, containers, cars, ships), we compare calculation values of these formulae with measured data of large-scale experiments. Finally, we check the range of calculation values for each formula up to 15 m/s in collision velocity and clarify then the following facts: (1) In the case of driftwood, the formulae of Matsutomi, Federal Emergency Management Agency (FEMA) and National Oceanic and Atmospheric Administration (NOAA), and American Society of Civil Engineers (ASCE) are most reliable; (2) In the case of containers, the formulae of Matsutomi, Arikawa et al., FEMA and NOAA, Ikeno et al., and ASCE are most reliable; (3) In the case of cars, the formulae of FEMA and NOAA, and ASCE are most reliable; (4) In the case of ships, the formulae of Mizutani, FEMA and NOAA, and ASCE are most reliable.

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Section: Shipmentioning

confidence: 99%

Applicability of Calculation Formulae of Impact Force by Tsunami Driftage

Yamamoto

Kozono

Mas

et al. 2021

JMSE

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“…In the case of the oblique collision, as shown in Fig. 13, a part of the debris' kinetic energy is transformed into rotational motion of the debris around the contact point after the oblique collision and the remaining kinetic energy is transmitted into the impacted structure as collision energy; E2 [Arita, 1988]. Before and after the collision, the angular momentum conservation equation is as follows:…”

Section: Improvement Of Collision Force Formulamentioning

confidence: 99%

“…On the other hand, Arita [1988] studied the strength of a ship against collisions, both experimentally and theoretically. He investigated the oblique collision energy of a drifted ship for the buffer design around a bridge pier by using angular momentum conservation before and after the collision.…”

Section: Introductionmentioning

confidence: 99%

“…He investigated the oblique collision energy of a drifted ship for the buffer design around a bridge pier by using angular momentum conservation before and after the collision. According to Arita [1988], a part of ship's kinetic energy was transformed into rotational motion around the contact point after the oblique collision and remaining kinetic energy was transmitted into the impacted structure as collision energy.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Collision Force Formula for Woody Debris by Airborne and Hydraulic Experiments

Ikeno

Takabatake

Kihara

et al. 2016

Coastal Engineering Journal

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The relationship between the collision direction angle and the collision force of woody debris and its behavior is investigated through large-scale bore flow and airborne experiments. In the case of the airborne experiment's oblique collision angle being larger than 20°, the oblique collision force is reduced by up to half of the longitudinal collision force. In the case of the bore flow experiment's initial arrangement along the transverse direction, the wood-log moved with a rotation along the channel floor. Collision forces in the bore flow experiment indicated the trend less than that in the airborne experiment. The effects of water cushioning between the wood-log and vertical wall, and the surrounding water caught by the rotation of debris were considered. Major collision force formulas for collisions in the long axis direction of woody debris are verified through comparison of this study and recent experiments. By considering the reduction in collision energy by the rotational motion of debris after oblique collisions, their collision force formulas are improved to estimate the oblique collision force. The improved formulas can reproduce the reduction of significantly oblique collision forces compared with longitudinal collision forces by the above experiments. The effect of the collision angle's uncertainty on the estimation of the *Corresponding author. 1640022-1 M. !keno et al. collision force was investigated as a case study on a probabilistic evaluation of the collision force.

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“…Petersen [4] developed a transient procedure for time simulation of the outer dynamics in ship collisions with including only the motions in horizontal plane. Arita [5] carried out theoretical, numerical and experimental studies on the structural crashworthiness of nuclear power vessels, LNG carriers and double hull tankers in collision. A theoretical approach to predict the energy absorption capability of striking and struck vessel structures was proposed and explored.…”

Section: State Of Artmentioning

confidence: 99%