密度モデルを用いた均一振動のための大型超音波工具のトポロジー最適化に関する和田助教の論文が Japanese Journal of Applied Physics に掲載されました。
Yuji Wada, Kentaro Nakamura. Topology optimization of large ultrasonic tools for uniform vibration using density model, Japanese Journal of Applied Physics, vol. 62, no. SJ, SJ1023, March 2023.
The uniform vibration of vibrating tools for ultrasonic welding is important for industrial applications but the design requires considerable know-how due to the nature of the wave phenomena. Topology optimization is a structural optimization technique that achieves the desired objective by controlling the material distribution in the design region including voids. In this study, we propose an objective function that maximizes the amplitude of a specific target point in phase with the input. A uniform vibration is obtained by maximizing the point with the smallest amplitude among multiple target points. Optimization is performed using a commonly used density model, resulting in a vibration distribution with an aligned phase on the output surface. In addition, we perform an eigenvalue analysis of the structure by isosurface extraction to study the frequency error and the deterioration in the uniformity of the assumed vibration mode.