Tsuneishi Shipbuilding Co.

Fukuyama, Japan

Tsuneishi Shipbuilding Co.

Fukuyama, Japan
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Patent
Kobe Steel, Asahi Shipping Co., TSUNEISHI SHIPBUILDING Co. and MIURA Co. | Date: 2016-08-17

A heat energy recovery system includes an evaporator, a superheater, an expander, a power recovery device, a condenser, a pump, and a controller. The controller includes: an engine load calculation section; a maximum rotation speed determination section for determining a maximum rotation speed of the pump which is obtained when a pinch temperature reaches a target pinch temperature, based on a relational expression representing a relationship between the engine load and the maximum rotation speed, and an engine load; and a rotation speed regulation section for regulating the rotation speed of the pump in such a way as to allow the degree of superheat of the working medium flowing into the expander to be equal to or greater than a reference value, and to allow the rotation speed to be equal to or less than a maximum rotation speed determined by the maximum rotation speed determination section.


Wada Y.,Hiroshima University | Wada Y.,Japan National Maritime Research Institute | Hamada K.,Hiroshima University | Hirata N.,Hiroshima University | And 2 more authors.
Journal of Marine Science and Technology (Japan) | Year: 2017

Shipbuilding is an industry in which the change in demand has been extremely drastic. Therefore, it is important to develop a method of demand forecasting for new ships to realize sustainable development of the shipbuilding industry. In this paper, a system dynamics model for demand forecasting of ships is discussed. The target ship type is the bulk carrier, and the target cargo commodities are iron ore, coal, and grain. To express shipbuilding market characteristics, causal relations between economic growth, sea cargo movement, ship bottoms, ship orders, construction, and ship scrapping are examined, and the cargo transportation prediction model, order prediction model, construction model, and scrap model are defined. Thus, demand-forecasting simulations using the proposed model are conducted, and the effectiveness of the proposed model is shown. © 2017 JASNAOE


Pei Z.,Tsuneishi Shipbuilding Co. | Iijima K.,Osaka University | Fujikubo M.,Osaka University | Tanaka Y.,Japan National Maritime Research Institute | And 3 more authors.
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2012

For a bulk carrier in alternative heavy loading condition, it is noted that the double bottom of an empty hold is subjected to both longitudinal thrust due to hull girder bending in hogging and local bending caused by high pressure loads on bottom plating. In order to examine the influence of local bending of double bottom on the ultimate hull girder strength, a series of nonlinear calculation is performed applying three different methods. The first method is Smith's method using in-house code, HULLST, to evaluate ultimate hull girder strength under pure bending. The second is the application of new system recently developed by the authors. This method is a combination of load/motion analysis and progressive collapse analysis. The third is nonlinear FEM analysis using a commercial code, MSC.Marc. It has been found that bending deformation is produced not only in double bottom but also in bilge hopper tank, and the ultimate hull girder strength is reduced by roughly 20% due to this local bending. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).


Pei Z.-Y.,Wuhan University of Technology | Tanaka S.,Hiroshima University | Fujikubo M.,Osaka University | Yao T.,Tsuneishi Ship Building CO.
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2016

When heavy cargos such as ore are loaded on bulk carrier, they are usually loaded only in cargo holds of an odd number, which is called alternate heavy loading condition. Under such situation, double bottom structure is subjected to local bending, and this reduces the ultimate hull girder strength in hogging. In this paper, a simple method is proposed which can account for the influence of local bending of double bottom on the ultimate hull girder strength in the framework of Smith's method. Two-beam theory is applied and local bending of double bottom as a plate is also considered. The calculated results are compared with the FEM results, and the proposed method is assessed. © 2016, Editorial Board of Journal of Ship Mechanics. All right reserved.


Pei Z.,Wuhan University of Technology | Iijima K.,Osaka University | Fujikubo M.,Osaka University | Tanaka S.,Hiroshima University | And 2 more authors.
Marine Structures | Year: 2015

To ensure the safety of navigating ship, working loads and structural load-carrying capacity are two important aspects. In the present paper, a total simulation system combing load calculation and structural collapse analysis is applied to simulate progressive collapse behaviour of a single-hull Kamsarmax type bulk carrier. A three dimensional singularity distribution method is adopted to calculate pressure distribution with time history. A mixed structural model, collapse part simulated by ISUM elements and remaining part by elastic FEM elements with relative coarse mesh, is proposed for collapse analysis. Progressive collapse behaviour obtained by ISUM is good agreement with that by nonlinear software package, MARC. However, the calculation time of ISUM analysis is about 1/70 of MARC analysis. The applicability to structure system, high accuracy and sufficient efficiency of ISUM had been demonstrated. © 2014 Elsevier Ltd.


Pei Z.-Y.,Wuhan University of Technology | Zhang S.-L.,Wuhan University of Technology | Yao T.,Tsuneishi Ship Building Co.
Gongcheng Lixue/Engineering Mechanics | Year: 2015

Research on the subjected loads and progressive collapse behaviour of ship structures has implications in ensuring the safety of navigating ships, making designs safer, and designing rational ship structures. In this research, the loads/motion analysis is performed using the three dimensional singularity distribution method based on potential theory. The obtained loads with time history are applied to the entire structural model. Progressive collapse analysis is performed by MSC. Marc considering geometrical and material nonlinear behaviours. The ultimate capacity of the ship structure is thus obtained. Assessments on structural safety can be conducted when the external loads and structural capacity are known. The degree of safety can be enhanced by increasing the plating thickness or stiffener size in the collapse region. ©, 2015, Tsinghua University. All right reserved.


Yamamoto M.,Hiroshima University | Shinozaki K.,Hiroshima University | Kadoi K.,Hiroshima University | Fujita D.,Tsuneishi Shipbuilding Company | And 3 more authors.
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society | Year: 2011

In this study, hot-wire laser welding was used to develop the welding method for the lap joint of 980MPa class high-strength steel sheets (thickness: 1 mm) with a wide gap. Detailed phenomena of wire melting and bead formation during welding were understood using the high-speed camera, and then the optimum welding condition and the mechanical properties of weld joints were investigated. The fiber laser with hot wire was used for welding the lap joint with the gap of 1 mm. The welding parameters such as the laser output of 3kW, spot diameter of 1.5mm ø, welding speed of 1.5m/min and the wire feeding speed of 3.8 m/min were fixed. The welding parameters of hot wire such as wire insertion angle, wire insertion position, and current of wire were varied. Moreover, shear test of the weld joints were done. As a result, upper and lower sheets with gap of 1 mm were well joined without weld defects in the welding parameters such as the wire insertion positions (from the laser spot center) of 3mm and the wire insertion angle of 70° and the wire currents of 102∼116A. Moreover, the tensile shear strengths of weld joints were 500∼600MPa regardless of the wire current.


Patent
Kobe Steel, MIURA Co., Asahi Shipping Co. and TSUNEISHI SHIPBUILDING Co. | Date: 2015-03-19

A waste heat recovery device including: a heater which evaporates an working medium by exchanging heat between supercharging air supplied to an engine and the working medium; a heat exchanger which heats the working medium by exchanging heat between the working medium which has flowed out from the heater and a heating medium; and an expander into which the working medium which has flowed out from the heat exchanger flows; a motive power recovery device; a condenser which condenses the working medium; and a pump which sends the working medium to a heater.


Patent
Kobe Steel, MIURA Co., Asahi Shipping Co. and TSUNEISHI SHIPBUILDING Co. | Date: 2015-03-19

A waste heat recovery system includes: a heater which evaporates a working medium by exchanging heat between supercharged air supplied to an engine and the working medium; an expander which expands the working medium which has flowed out from the heater; a power recovery device connected to the expander; a condenser which condenses the working medium which has flowed out from the expander; a cooling medium supply pipe for supplying a cooling medium to an air cooler which cools the supercharged air which has flowed out from the heater; a cooling medium pump which is provided in the cooling medium supply pipe and which sends the cooling medium to the air cooler; and a branch pipe which bifurcates a part of the cooling medium flowing in the cooling medium supply pipe, to the condenser, in such a manner that the working medium is cooled by the cooling medium.


Patent
Kobe Steel, Asahi Shipping Co., TSUNEISHI SHIPBUILDING Co. and MIURA Co. | Date: 2016-04-01

Disclosed is a heat energy recovery system including: a heat energy recovery circuit that causes a working medium to circulate by means of a circulation pump to exchange heat with supercharged air from a supercharger via a first heater and exchange heat with steam from an exhaust-gas economizer via a second heater, in order to integrally drive a turbine and a generator; and a controller that performs stop control to stop the circulation pump based on the flow state of the steam in a first steam flow path that causes the steam to flow from the exhaust-gas economizer to a soot blower.

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