نتایج جستجو برای: ship model
تعداد نتایج: 2117437 فیلتر نتایج به سال:
The manning of a ship is a major driver of total ownership cost. The Government Accounting Office (GAO) states that “the cost of the ship’s crew is the largest expense incurred over the ship’s lifetime” [1]. This cost is largely determined by decisions made during concept design, which may include significant new support costs ashore. Consequently, reliable manpower estimates and related design...
The coupling motion of heave, pitch and roll of intact ship and damaged ship in waves, and the flow of flood water in damaged tank have been simulated based on viscous theory. The calculation model is a 29000 t tanker model moving at a constant speed with damaged tank in midship area. Three cosine waves including head waves, beam waves and oblique waves are simulated by boundary input method re...
With the rapid development of optical remote sensing satellites, ship detection and identification based on large-scale remote sensing images has become a significant maritime research topic. Compared with traditional ocean-going vessel detection, inshore ship detection has received increasing attention in harbor dynamic surveillance and maritime management. However, because the harbor environm...
Singapore has one of the busiest ports in the world. Ship berthing is one of the problems faced by the planners at the port. In this paper , we study the ship berthing problem. We first provide the problem formulation and study the complexity of the problem with different restrictions. In general, the ship berthing problem is NP-complete, although, some of its variants may be solved quickly. Wh...
Double cycling is an efficient tool to increase the efficiency of quay crane (QC) in container terminals. In this paper, an optimization model for double cycling is developed to optimize the operation sequence of multiple QCs. The objective is to minimize the makespan of the ship handling operation considering the ship balance constraint. To solve the model, an algorithm based on Lagrangian rel...
0957-4174/$ see front matter 2012 Elsevier Ltd. A doi:10.1016/j.eswa.2012.01.176 ⇑ Corresponding author. Tel.: +65 65165494; fax: + E-mail address: [email protected] (Q. Meng). The traffic volume in the Singapore Strait will be significantly increased according to the prediction by the United Nations Conference on Trade and Development. Therefore, it is important for the maritime authorities (e....
This chapter covers the concerns with a problem of adaptive ship control synthesis in the case of substantially limited knowledge of the plant model. In fact we have at our disposal only its highly general structure in the form of Norrbin’s-like representation with unknown nonlinearities. Two tasks of ship control are considered. The first task is concerning the ship course-keeping system desig...
A control system is proposed for the regulation problem of the roll-motion of a manned sea-surface vehicle. Taking into account the roll-ship equations coming from the Conolly theory, a novel stochastic model has been proposed for the uncertainties driving the total mechanical torque acting on the vehicle, deriving from the wind and/or the sea-wave action. The proposed model results in a biline...
The design of ships is an inherently complex process. This complexity is significantly increased when the particular ship being designed is a naval surface combatant. Naval combatant designers, or more appropriately, design teams, must not only address the factors common to all seagoing vessels such as hull form, propulsion, and maneuverability, but additionally must consider the selection, pla...
Local Vibrations represent one of the most critical parameters for the comfort evaluation on board of the ship. Normally a limit value of vibration is defined in the ship specification and the shipyard has the responsibility to assure that the specified values are not exceeded. Depending mainly on the extension, vibration phenomena could be divided in Global Hull vibrations and local vibrations...
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