固有振動数の変動最小化を目的とした確率有限要素法に基づくロバスト設計法

抄録

Recently, in a mechanical structure development focusing on noise and vibration, a numerical analysis like finite element method is the most famous method to expect and improve noise and vibration characteristics of the structure. However, the method is not taken account of uncertainties in structure like part shapes and connecting parts in many cases. It leads to differences between actual these characteristics and results from numerical analysis. And, the quality of the product is probably deteriorated by the uncertainties. Therefore, it is important to suppress the variation of the noise and vibration characteristics by the uncertainties, which is called robust design. In this paper, it is discussed about robust design method to minimize the variation of the eigen frequency by the uncertainties. The robust design method is based on stochastic finite element method and structural optimization. To evaluate the ability of the method, the robust design method is applied to an FE model and a spring mass system, and the method is also tested by the actual structure to confirm the performance.