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On the directional stability of ships
International Shipbuilding Progress, 1980A nonlinear second order ordinary differential equation in yaw rate is used to study the directional stability of a surface ship when the ship moves with randomly varying forward speed. Randomly varying forward speed may be caused by surge motion in random following (or oblique) waves.
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A directional spectrum evolution model for ship noise
The Journal of the Acoustical Society of America, 2023A radiation transport equation that describes the spatiotemporal evolution of the directional spectrum of underwater acoustic noise is presented and applied to ship noise. A ray-based algorithm is used to solve the transport equation and numerically simulate the evolution of the directional noise spectrum produced by a passing ship. The model described
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A framework for analysing long‐range direct shipping logistics
Industrial Management & Data Systems, 2005PurposeTo present a decision support system (DSS) enabling the analysis of the cost‐effectiveness of direct‐shipping long‐haul road transport policies, including full truck load (FTL) and less than truck load (LTL) modes, and to select the optimal carrier.Design/methodology/approachAnalytical estimation of transportation costs is provided in a ...
CAPUTO A. C +2 more
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A multi-objective DIRECT algorithm for ship hull optimization
Computational Optimization and Applications, 2017The paper is concerned with black-box nonlinear constrained multi-objective optimization problems. Our interest is the definition of a multi-objective deterministic partition-based algorithm. The main target of the proposed algorithm is the solution of a real ship hull optimization problem.
Emilio Fortunato Campana +7 more
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Analysis of Direct Shipping Policies in an Inventory-Routing Problem with Discrete Shipping Times
Management Science, 2008We consider the problem in which several products have to be shipped from a supplier to a set of retailers over an infinite time horizon. Each product is made available at the supplier and absorbed by each retailer at given constant production and consumption rates.
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Direct and Remote Sensing Observations of the Effects of Ships on Clouds
Science, 1989Under certain conditions ships can affect the structure of shallow layer clouds. Simultaneous observations of two ship track signatures in stratus clouds from a satellite and in situ from an aircraft show that in the ship tracks the droplet sizes were reduced and total concentrations of both droplets and particles were substantially increased from ...
L F, Radke, J A, Coakley, M D, King
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Direct Ship Guidance for Aerospace Companies
2021<div class="section abstract"> <div class="htmlview paragraph">This document is limited to the aerospace industry, where an approved manufacturer requests a supplier to ship an article against the approved manufacturer’s quality system directly to a customer.
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New directions for research in shipping economics
Maritime Policy & Management, 1980The beginning of the decade of the 80s is characterized everywhere by a slow-down in growth and great uncertainty in world output and trade, as well as insecurity in international monetary affairs. Consequently, there is anxiety about the current state and prospects for shipping.
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Directional Stability and Control of Ships in Waves
Journal of Ship Research, 1972The stability and oscillatory motions of ships (automatically steered and unsteered) in the horizontal plane were examined on a digital computer for the case of regular following seas. Available hydrodynamic data for Series 60 hull forms were used. Analysis of directional stability was made for the case of zero encounter frequency (i.e., the ship runs ...
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Wireless direction-finding in steel ships
Journal of the Institution of Electrical Engineers, 1923The problems of direction-finding which are peculiar to ships are discussed. A method of regarding the action of a ship on wireless waves is given, as well as means of correcting for the deviations so produced. The precautions to be observed in the calibration of a ship direction-finder are indicated.
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