防撓板構造の防振設計に関する研究

概要

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The dynamic optimum design of stiffened plate is studied, considering the dynamic characteristics, control of the natural frequency and lightening of stiffened plate. For the beginning, the vibration characteristics of stiffened plates are examined by the finite element method. In addition, an approximate formula cosidering the rotatory inertia of the stiffener is proposed in order to obtain the natural frequency of the stiffend plate. Next, the optimization which control of the natural frequency of the specific vibration modes and reduce the weight of the stiffened plate by the applicatioin of multistage optimization method is done. The processes of the design are as follows. In the first step, the natural frequency is controlled for the two-dimensional model of stiffened plate by following tow optimization methods; sensitivity analysis using the sensitivity of the eigenvalues of the stiffened plate and the fuzzy reasoning algorithm. In the second step, the cross-section of the stiffener is decided so that the weight is minimized under needed constraints. In the third step, the three-dimensional model is made based on the results of the first step and the second step, and confirmation and finer tuning of the frequency are carried out. It is shown that the results are effective in the design for vibration of stiffened plates.
社団法人日本船舶海洋工学会の論文
1998-09-04