On the Measurement of Added Mass and Added Moment of Inertia for ship Motions

Motora, Seizo

doi:10.2534/jjasnaoe1952.1960.107_83

Cited by 9 publications

(10 citation statements)

References 1 publication

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“…Its value was independent of acceleration and about 0.06 of the hull mass. This value was in agreement with Motora's (1960) experimental results) for general shape hulls and will be used here. Heave and pitch hydrodynamic coefficients will be important in seakeeping and stability analysis where vessel heave and pitch velocities and accelerations are significant.…”

Section: L0supporting

confidence: 71%

Planing craft modeling in forward acceleration mode and minimisation of time to reach final speed

Yengejeh

Mehdigholi

Seif

2014

Ships and Offshore Structures

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Properly adjusting the trim angle during the craft speed up will be extremely important in special cases as in sports competitions or military missions. In such applications, the goal of trim adjustment is to reach final speed in a minimum possible time which is an advantage to just passing the resistance hump. Present study tries to provide insight into how the angles of the drive system and trim tab of a planing craft should be changed during speed up so as to minimise the time to reach the final speed. This is a time-optimal control problem with the drive and trim tab angles as the control variables. Optimal control theory has been used previously for the motion control of marine vessels in the applications such as seakeeping, manoeuvring and navigation. This study introduces a new application of this theory for increasing the craft speed performance. Conventional empirical relations are used in the equations of motion for calculating hydrodynamic forces to develop the dynamic model. To calculate the forces due to the propulsion system, attempts are made to take into account the propeller, the drive system and the engine concurrently in a simplified manner. The solution algorithm is explained and the results for a planing vessel with two different longitudinal centers of gravity are presented. Optimal solution for control variables shows a simultaneity and similarity in trend with the hull instantaneous trim angle. However, the optimal signals are restricted by upper physical margins.

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Section: L0supporting

confidence: 71%

Planing craft modeling in forward acceleration mode and minimisation of time to reach final speed

Yengejeh

Mehdigholi

Seif

2014

Ships and Offshore Structures

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“…where, R w was effective wake fraction coefficient at rudder which approximated as that 0.25 R w [3], and x k was ratio of accelerating by propeller at rudder which approximated as that 0.6…”

Section: Ruddermentioning

confidence: 99%

“…The radius of gyration was estimated from that 0.25 zz k L , where L was length of the ship. The added mass and moment of inertia were estimated from ship length, ship breadth(B), ship draft(d), and block coefficient(C B ) using with Motora chart [3]. The data of block coefficient was not indicated in the pilot card, then, it was estimated as follows,…”

Section: Basic Datamentioning

confidence: 99%

Basic Study on Navigation Aid System when Pilot Trainee Crosses Sea Route

Okazaki

Shigeta

Kato

2012

2012 Fifth International Conference on Emerging Trends in Engineering and Technology

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“…The radius of gyration was estimated from that , where L was length of the ship. The added mass and moment of inertia were estimated from ship length, ship breadth(B), ship draft(d), and block coefficient(C B ) using with Motora chart [7]. The data of block coefficient was estimated as follows,…”

Section: Maneuvering Model Of Large Vesselmentioning

confidence: 99%

Evaluation of Override Ship Maneuvering Simulator Using Augmented Reality

Takaseki

Okazaki

2015

2015 IEEE International Conference on Systems, Man, and Cybernetics

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This paper proposed a ship handling simulator using actual training ship for third grade pilot trainees. The ship handling simulator was achieved by developing the control system which reproduced a large vessel's maneuverability on the actual training ship. Moreover, visual system that gave scenery from large vessel's bridge for trainees by using Augmented Reality was developed. In order to evaluate the influence of the developed system on trainees, trainee's mental workload when the system was used was measured at the actual ship experiment. The experimental result showed that developed system derives trainee's high motivation for maneuvering training.

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On the Measurement of Added Mass and Added Moment of Inertia for ship Motions

Cited by 9 publications

References 1 publication

Planing craft modeling in forward acceleration mode and minimisation of time to reach final speed

Planing craft modeling in forward acceleration mode and minimisation of time to reach final speed

Basic Study on Navigation Aid System when Pilot Trainee Crosses Sea Route

Evaluation of Override Ship Maneuvering Simulator Using Augmented Reality

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