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Mitsubishi Group, Tsuneishi Holdings Corporation and Hitachi Zosen Corporation | Date: 2010-09-15

In a marine diesel engine equipped with a plurality of turbochargers, when the turbochargers are switched from single operation to parallel operation or from parallel operation to single operation, surging in the turbocharger to be started or stopped is prevented. The marine diesel engine includes an exhaust pipe (L2) via which an exhaust manifold (6) mounted on an engine body (2) communicates with a turbine part (4a), a turbine inlet valve (10) connected somewhere in the exhaust pipe (L2), a supply pipe (L4) via which a compressor part (4b) communicates with a supply manifold (7) mounted on the engine body (2), a check valve (11) that is connected somewhere in the supply pipe (L4) and that becomes open when the outlet pressure of the compressor part (4b) reaches or exceeds the outlet pressure of a compressor part (3b); an air vent pipe (L9) having one end thereof connected somewhere in the supply pipe (L4) between the compressor part (4b) and the check valve (11), and an air vent valve (12) connected somewhere in the air vent pipe (L9).

Pei Z.,Tsuneishi Shanghai Ship Design Co. | Takami T.,Osaka University | Gao C.,Tsuneishi Shanghai Ship Design Co. | Fu J.,Tsuneishi Shanghai Ship Design Co. | And 4 more authors.
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2010

Idealized Structural Unit Method (ISUM) is known as a simple but efficient method to simulate progressive collapse behaviour of ship structures. The ISUM plate element under combined bi-axial thrust and bending has been developed by some of the authors. In the present study, shear collapse behaviour is newly introduced in the existing ISUM plate element firstly. Through a series of comparison analyses using nonlinear FEM and developed ISUM shear plate element, the accuracy and effectiveness are examined including the cases of buckling/plastic collapse behaviour under pure shear, combined bending and shear, and combined transverse thrust and shear. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).

Pei Z.,Tsuneishi Shanghai Ship Design Co. | Ji Y.,Tsuneishi Shanghai Ship Design Co. | Nakamaru K.,Hiroshima University | Tanaka S.,Hiroshima University | And 3 more authors.
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2010

New non-rectangular quadrilateral ISUM (Idealised Structural Unit Method) element is developed in accordance with the formulation of isoparametric FEM element. Calculated results applying the new element are compared with those by nonlinear FEM analyses and the validity of the proposed ISUM element is discussed. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).

Tanaka S.,Hiroshima University | Okazawa S.,Hiroshima University | Okada H.,Tokyo University of Science | Xi Y.,Tsuneishi Holdings Corporation | Ohtsuki Y.,Tsuneishi Holdings Corporation
International Journal of Offshore and Polar Engineering | Year: 2013

We present a new approach to calculate stress intensity factors of three-dimensional surface cracks in welded joints of a ship structure. We analyze problems involving very different length scales, using a shell-solid mixed finite element model. In this technique, the shell element model is used on the whole ship structure, and the solid element model is adopted for the part of the welded joint with a three-dimensional surface crack. The solid model is constituted of the quadrilateral tetrahedral elements. The shell model and the solid model are connected using the semi-auto RBE3 connecting technique, which enhances the tractability of the shell-solid mixed modeling. The Virtual Crack Closure-Integral Method for the tetrahedral finite element method is used to calculate the SIFs of the surface crack. In this paper, the numerical approach and the application are demonstrated. © by The International Society of Offshore and Polar Engineers.

Kose N.,Okayama Prefectural University | Kose N.,Tsuneishi Holdings Corporation | Nakagawa T.,Okayama Prefectural University | Nakagawa T.,Tsuneishi Holdings Corporation | And 2 more authors.
Kagaku Kogaku Ronbunshu | Year: 2012

In order to introduce and expand the use of natural energy, research has recently been conducted on smart communities that manage the energy balance in a specific region. For a system combining photovoltaic power generation (PV) and electric vehicles (EV), we have developed a model to quantitatively evaluate the change in energy use by EV together with other energy in a specific region with multiple EV. Using this model, we have examined a method to optimize PV use in the case of conversion to EV use based on data of actual vehicle movement. As a result, for designing a combined system PV and EV, we have defined two new indexes: PV rate of electric consumption by EV, and EV usage rate of PV. By using the new indexes, we have shown that it is possible to design the installation site, scale of PV and battery capacity of EV according to the use of EV.

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