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4 Polish Maritime Research

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Hull strength assessment of the designed ships

100%

Bogdaniuk M. , Górecki Z.

tom S 1

54-56

The paper presents the method and scope of analysis of the hull strength of four ships designed in the Eureka project. Criteria of the Det Norske Veritas rules for classification and construction of ships were used in the analysis. Specific features of the structure of each hull have been described and the resulting problems connected with ensuring adequate strength.

FEM analysis of ultimate strength of steel panels

80%

Bogdaniuk M. , Górecki Z. , Brzóska M.

2006

tom S 1

21-23

A method was described of ultimate strength calculation of compressed steel panels proposed for shipbuilding applications. The calculations consist in applying Finite Element Method (FEM) to a model composed of finite shell elements. Large displacement values and plastic flow of material are taken into consideration. Results of ultimate strength calculations of an example panel under compression were compared with those from experimental tests. Accuracy of a proposed simple method of ultimate strength assessment based on the longitudinal bending theory of rod with initial deflections, was also investigated.

Concept of barge hull structure made of extruded aluminium panels

80%

Bogdaniuk M. , Górecki Z. , Łukowski R.

2006

tom S 2

88-90

A design of the hotel barge of 52 m overall length and 9 m breadth , intended for inland waterway shipping on the route from Berlin to Kaliningrad, is presented. Hull of the barge is characterized by a unique structure consisted of densely stiffened aluminium panels of 4.5 mm plate thickness and 70 mm depth of stiffeners, supported by transverse walls or girders. The stiffeners of the panels are longitudinally directed. Also, are described problems associated with assurance of adequate strength and stiffness of such structure, resulting from a limited maximum depth of the barge.

Selected problems concerning strength of a floating dock with roof

80%

Bogdaniuk M. , Górecki Z. , Puch W.

tom S 1

51-55

The paper presents models and results of the structural strength analysis of a roofed floating dock. Computed thickness of the roof structure walls capable of withstanding the environmental loads is 24 mm. Heavy sliding roof segments generate the dock pontoon floor plate stresses reaching 25% of the permissible stress value. The dock pontoon structure effort under the roof and docked ship weight load was minimized by seeking an optimum balancing ballast distribution. The problem was solved in two ways: analytically, by means of a simplified model of a continuous beam on elastic foundation and numerically, using the linear programming method to construct an accurate discrete FEM model.