Efficient Acoustic Optimization Using Perturbation Method with Complementary Term

摘要

In these days finite element method is often used "to design and develop products effectively. Product design using finite element models reduces the need for expensive, time-consuming prototype tests, and allows designers to repeat the trial and error design processes. In this case dynamic characteristics prediction method of much changed structure is very important. Yamazaki and Hagiwara developed the new perturbation method with complementary term for this purpose and showed that this method can reduce the time of analysis drastically [1, 2], but this method causes the extreme long calculation time and calculation instability problems when the structure changed widely. Here, we propose the new complementary vector computation method and efficient responses calculation method to solve these problems, and evaluate these methods' accuracy, calculation speed and stability. After that, we apply the proposed methods to acoustic optimization problem to show the efficiency and practicality.