351 遠心力を受ける複合材積層板の振動解析

概要

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Since composite materials are known to have high specific stiffness and strength, they have been widely used many industrial fields, including windmill turbine blades. Such light-weight composite structures under body forces are required to study their vibration characteristics to prevent fatigue failure or noise. In this report, the effect of centrifugal forces is studied on natural frequencies of composite laminated plates as a model of blade. The stress distribution of plates under centrifugal forces is first solved by the Ritz method, and natural frequencies under in-plane stresses are calculated by the Ritz method using in-plane stress distributions found in the first problem. The numerical results obtained by the present method are compared with those from the calculation assuming the stresses distributed uni-directionally. It is found that for the plate with high aspect ratio, both results agree well and this validates the present calculation method. Next, lay-up configurations of composite laminated plates are optimized to maximize the fundamental frequency under centrifugal forces by a layerwise optimization (LO) method. The optimum lay-up configuration determined by the LO method with both the present and the simple uni-directional stress models results in higher fundamental frequencies than plates with typical lay-up configurations.
一般社団法人日本機械学会の論文
2011-09-05