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Zhang Han-zh - One of the best experts on this subject based on the ideXlab platform.

  • Optimization Research on Assembly Work on Dock Based on a Hybrid Genetic Algorithm
    2014
    Co-Authors: Zhang Han-zh
    Abstract:

    To minimize the time on Building Berth, reduce the cost and equipoise the resource load in assembly work on dock, assembly work is analyzed and modeled. And a particular hybrid genetic algorithm is designed. The software is also developed. The process of decoding embodies the goal of minimizing the time on Building Berth, which guarantees the uniqueness of the decoding. Moreover, the process of evaluation and selection embodies the goal of reducing the cost. The schedule for the assembly work on dock created by this method plays a guiding role in practical production. Finally, an example is given to verify the feasibility and effectiveness of the method.

Wei Yong-xian - One of the best experts on this subject based on the ideXlab platform.

  • Optimizing ShipBuilding Process and Shortening Time on Building Berth
    2007
    Co-Authors: Wei Yong-xian
    Abstract:

    This paper introduces the new advances of Shanghai Shipyard Chengxi Shipyard Co., Ltd. in the endeavour to develop fabricated block joining, block pre-outfitting and precision-control shipBuilding technology, and to improve the completion of block fabrication and joined blocks before their erection on the slipway (dry dock) and ship launching, which make the shipyard key facilities of slipway (dry dock) be mostly effective in shipBuilding production.

Masao Yoshiki - One of the best experts on this subject based on the ideXlab platform.

  • The Thirty-fifth Thomas Lowe Gray Lecture DESIGN AND CONSTRUCTION OF LARGE TANKERS IN JAPAN
    2016
    Co-Authors: Masao Yoshiki
    Abstract:

    This lecture first presents an outline of research work by which many troublesome problems in the design and construction of large tankers were solved, and secondly introduccs the largest tanker ever built in Japan, the A’issho Maru, of 130 000 deadweight tonnage. With regard to design of such tankers, two points, that is, (1) reduction in length of ship (L), and (2) increase in depth (D), should be taken into account from the standpoint of weight saving and of easy fabrication. Researches into structural problems of tank parts and into the dynamic pressure of cargo oil tank, due to ship motions, are described briefly, and show that the maximum impulsive pressure in model tests may be up to 5 times the static fluid pressure and may be observed at the tank top when the natural period of fluid in the tank is resonant with the oscillation period of the ship. Special care should be taken in thc detailed design of Iongitudinals, struts and so on, otherwise cracks will initiate easily at the point of stress conccntration. As regards hull construction practices in such large tankcrs, there secm to be no special problems except in the fabrication and welding of very thick plate of up to 50 mm thickness. Very thick plates thus offer several problems to be solved such as groove shapes, application of ‘Unionmelt’, doubling plate, weld cracking, and back-wave welding technique, ctc. Brief discussion and some test results on these problcms are included and mention is made of the superiority of KZ-typc groove for automatic single-pass submerged-arc welding and of ‘Uranami ‘ welding electrode (which offers a perfect one-sidc welding without backing plate). Finally, construction methods for large tankers are briefly introduced to give an idea of the hull construction of such large tankers in the Building Berth

Eddie Adler - One of the best experts on this subject based on the ideXlab platform.

  • The National ShipBuilding Research Program. Limitations of Computerized Lofting for Shell Plate Development
    1994
    Co-Authors: Thomas Lamb, Thomas Perrine, Shelby Anderson, Eddie Adler
    Abstract:

    Abstract : Some shipyards are not satisfied with the current computer aided lofting (CAL) shell development systems that they use. This dissatisfaction manifests itself in fit up problems and the need for excess material ( green or stock ) to be left on some butts and seams to allow corrections to be made at erection. Most shipbuilders desire a cut to neat size approach. This is obviously to eliminate labor intensive fitting cutting in and edge preparation for welding, on the assembly plattens or Building Berth. On the other hand, most CAL developers recommend that stock material be left on one seam and one butt for each shell plate block with significant curvature. They claim that this is to take care of inaccuracies due to the platers skill level and limitations of the forming machinery, rather than inaccuracies in the shell development systems. This study was undertaken to help put the shell plate development problems in their correct perspective and to determine if the shipbuilders goal of cutting all shell plates neat is reasonable. The study was performed in two phases to suit funding restrictions. Phase I developed the Problem and Solution Description and Phase II covered the development of the Shell Plate Test Cases and the preparation of the Ship Designers Manual.

Pardi P. - One of the best experts on this subject based on the ideXlab platform.

  • Analisis Potensi Pasar dan Pemilihan Lokasi untuk Perencanaan Pembangunan Galangan Kapal di Kabupaten Bengkalis
    'Politeknik Negeri Bengkalis', 2017
    Co-Authors: Afriantoni A., Pardi P.
    Abstract:

    Penelitian ini bertujuan untuk menganalisis potensi pasar dan menentukan lokasi terbaik pada perencanaanpembangunan galangan kapal di Kabupaten Bengkalis sehingga selanjutnya dapat dilakukan perencanaan fasilitas, sarana dan layout galangan kapal yang akan direncanakan. Analisis potensi pasar dilakukan dengan mengkaji data-data yang ada dan untuk bangunan baru juga dianalisis dengan metode forecasting. Pemilihan lokasi dilakukan dengan pembobotan sederhana untukbeberapa lokasi yang menjadi target dengan menilai kriteria dan sub-kriteria pada 4 lokasi desa yang dinilai berpotensi. Hasil analisis potensi, pasar utama reparasi adalah kapal Tugboat, Penumpang/Ferry dan Barge.Sedangkan hasil forecasting, permintaan pembangunan kapal baru masih besar terutama tipe kapal Tugboat dan Penumpang/Ferry.Pada analisis pemilihan lokasi, desa Sejangat terpilih sebagai lokasi paling potensial dengan hasil pembobotan sebesar 68,4% untuk komposisi penilaian lokasi atau komposisi rasio 26,9%.Untuk perencanaan fasilitas utama galangan telah direncanakan masing-masing 2 area untuk fasilitas produksi seperti Building Berth danslipwaydengan ukuran 25 x 80 m2 dan 25 x 100 m2untuk bangunan baru,dan 20 x 80 m2& 20 x 100 m2 untuk kegiatan reparasi, serta juga perencanaan bengkel-bengkel produksi. Pada perencanaanlayout galangan, dipilih layout tipe I dan direncanakan tenaga kerja langsung 38 orang dan tidak langsung 25 orang. Kata Kunci - potensi pasar, pemilihan lokasi, fasilitas galangan kapa

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