Showing papers by "DNV GL published in 1974"
TL;DR: In this paper, a nonlinear, inviscid boundary-value problem of potential flow is formulated and the steady-state solution is found as a power series in epsilon to the one-third correctly to the order Epsilon.
Abstract: A two-dimensional rigid, rectangular, open tank without baffles is forced to oscillate harmonically with small amplitudes of sway or roll oscillation in the vicinity of the lowest natural frequency for the fluid inside the tank. The breadth of the tank is 0 (1) and the depth of the fluid is either (1) or infinite. The excitation is of the order epsilon and the response is of the order epsilon to the one-third. A nonlinear, inviscid boundary-value problem of potential flow is formulated and the steady-state solution is found as a power series in epsilon to the one-third correctly to the order epsilon. Comparison between theory and experiment shows reasonable agreement. The stability of the steady-state solution has been studied.
218 citations
TL;DR: The superelement method in combination with extensive data generators materialized in the program system SESAM-69 introduce a new dimension to the concept of the Finite Element Method (FEM).
36 citations
TL;DR: In this article, the results from application of shell elements for prediction of quasi static and dynamic stresses in marine propeller blades are compared with experiments, and specially designed data generators are employed to facilitate the helicoidal geometry involved.
23 citations
10 citations
TL;DR: In this article, a linear elastic and static seven level detailed stress analysis is performed on the 190000 tons DWt oil tanker Esso Norway on which full scale measurements have been carried out.
7 citations
TL;DR: The finite element method has given the designer of machinery components and structures a new tool for analysis of stresses, temperatures and dynamic vibrations as discussed by the authors, and some applications of the tool to different problems within this field are shown (by some examples), using the SESAM-69 complex.
5 citations
TL;DR: In this article, a survey of the field of reliability as related to marine engineering is presented, focusing on the reliability and availability of the propulsion, navigation and cargo handling of ships.
Abstract: This paper surveys the field of reliability as related to marine engineering. The problems in marine systems are characterized by availability and safety. However, the two are different aspects of the same problem, and the discipline of reliability engineering provides solution tools for both. Obviously the reliability and availability of the propulsion, navigation and cargo handling are vitally important to the economic operation of ships. Equally important are safe handling of hazardous cargoes and safe navigation through restricted waters and in areas of high traffic density. Experience in dealing with marine equipment and systems has shown that the available techniques and methods of reliability engineering should be applied with care in marine engineering. Special attention should be paid to failure cause, mechanism, and mode. Some proven methods are discussed. In general, there is a lack of data on mechanical components and systems. This is particularly true for marine equipment because of its size, lack of standardization, low sample size and operational environment. A data collection program, now running successfully, is described. Particularly interesting is the conformity of observed values with the negative exponential distribution of failure for some items. The future aspects of reliability engineering in the marine industry are discussed.
4 citations
TL;DR: The use of the automated plane frame design program previously described is discussed in this paper, which includes a special adaptation for tanker transverse frames including more realistic frame support conditions than otherwise obtainable.
3 citations
TL;DR: In this article, the merits of finite element methods in connection with the design of offshore structures are discussed using the Ekofisk Tank as an example, and various design approaches and procedures are evaluated on the same basis.
3 citations