Practical Design of Ships and Other Floating Structures. by You-Sheng Wu, Wei-Cheng Cui and Guo-Jun Zhou (Eds.)

By You-Sheng Wu, Wei-Cheng Cui and Guo-Jun Zhou (Eds.)

This court cases comprises the papers provided on the eighth foreign Symposium on Practical layout of Ships and different Floating Structures held in China in September 2001 - the 1st PRADS of the twenty first Century.

The total goal of PRADS symposia is to strengthen the layout of ships and different floating buildings as a qualified self-discipline and technology by means of replacing wisdom and selling dialogue of suitable issues within the fields of naval structure and marine and offshore engineering. according to the purpose, in welcoming the recent period, this Symposium is meant to extend foreign co-operation and provides a momentum for the recent improvement of layout and creation expertise of ships and different floating constructions for potency, financial system, defense, and environmental production.

The major topics of this Symposium are layout Synthesis, construction, Hydrodynamics, constructions and fabrics of Ships and Floating structures. Proposals for over 270 papers from 26 nations and areas in the topics have been got for PRADS 2001, and approximately one hundred seventy papers have been authorized for presentation on the symposium. With the top of the range of the proposed papers the neighborhood setting up Committee had a tricky job to make a balanced choice and to manage the whole variety of papers for becoming into the allotted time agenda licensed by way of the status Committee of PRADS.

Volume I covers layout synthesis, construction and a part of hydrodynamics. quantity II includes the remainder of hydrodynamics, and constructions and materials.

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It is thus not difficult to understand why a preliminary design stage optimization tool is attractive. a). "LBR-5'" is the French acronym of "Stiffened Panels Software". ) with a rational optimization design module and a minimum construction cost/weight objective function. LBR-5 is this rational optimization module for structures composed of stiffened plates and stiffened cylindrical shells. It is an integrated model to analyze and optimize naval and hydraulic structures at their earliest stages: tendering and preliminary design.

The optimal center and outer hull forms are determined independently in the first step, where each hull keeps the same displacement as the original design while the wave drag is minimized. The optimal outer-hull arrangement is determined in the second step for the optimal center and outer hull forms obtained in the first step. Results indicate that the new design can achieve a large wave drag reduction in comparison to the original design configuration. KEYWORDS Hull form design, Hull form optimization, Wave cancellation multihull ship, Trimaran, Wave resistance, CFD tools, Slender ship approximation, Surface parameterization.

In the first step of the optimal design process, the wave drag for each individual hull is evaluated using Eqns. 1-2, and the center hull and the outer hull are optimized independently for the purpose of minimizing the wave drag of each hull. In the second step of the optimal design process, the total wave drag Cw for the optimal center and outer hull forms obtained form the first step needs to be computed so that an optimal arrangement of the outer hull with respect to the center hull can be determined.

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