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A Study on Optimum Modification of Dynamic Characteristics of Stiffened Plate Using Simplified Equation of Natural Frequency  

박성현 (목포해양대학교 해상운송시스템공학부)
남정길 (목포해양대학교 기관공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.26, no.1, 2002 , pp. 48-58 More about this Journal
Abstract
There is a purpose of this study for the proposal of the optimum technique utilized for the vibration design initial step. The stiffened plate structure for the ship hull is made for analysis model. To begin with, dynamic characteristics of stiffened plate structure is analysed using FEM. Main vibrational mode of the structure is decided in the analytical result of FEM. The simplified equation on the natural frequency of the main vibrational mode is induced. Next, sensitivity analysis is carried out using the simplified equation, and rate of change of dynamic characteristics is calculated. Then, amount of design variable is calculated using this sensitivity value and optimum structural modification method. The change of natural frequency is made to be an objective function. Thickness of panel, cross section moment of stiffener and girder become a design variable. The validity of the optimization method using simplified equation is examined. It is shown that the result effective in the optimum modification for natural frequency of the stiffened plate structure.
Keywords
Stiffened plate structure; Main vibrational mode; Simplified equation; Sensitivity analysis method; Optimum structural modification;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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