新しい位相最適化法の開発と折紙輸送箱への適用

（固有周波数の最適化手法について）

抄録

We have developed many types of transport boxes by origami-operation and space filling operation. But it has not been solved that the fruits and vegetables such as strawberries, cells, blood and a bottle of sake are damaged, broken during transportation. It is the greatest factor in the situation that there is a vibration frequency range where these are easy to scratch and these are prone to death. If there are eigenfrequencies within the frequency range, it is re-designed such that the eigenfrequencies within the frequency range are moved out of the range. But it is difficult to apply the existing topology optimization. The traditional method, it is difficult to select a great number of eigenfrequencies and set several each objective frequency depending. For example, if it is making any hole arbitrary point, some eigenfrequencies are high, and others are low. When it making any hole in each section, it is important to understanding that the eigenfrequency is higher or lower in advance. First, it clearly articulates the kinetic energy density or the strain energy density. And, the method to control the eigenfrequency by identifying the position of the hole from the energy density is proposed in this paper.