分割試験におけるモード打ち切リ誤差の検討 : 第1報,はりモデルによるシミュレーション

概要

論文の詳細を見る
As a testing method for large structures, such as aerospace structures, substructure testing was considered. The main subject of this investigation is modal truncation. As the characteristics of substructures are represented by the lower vibration modes, an error due to truncated higher modes is inherent. In order to evaluate the truncation error, numerical analyses were performed on the flexural vibration of simple beams. Modal parameters of the beam were calculated based on the beam theory. Then two or three beams were coupled analytically using these parameters. The relations between the frequency error and the number of component modes were examined under various conditions. The results of the analyses indicate that the process of modal truncation depends highly on the types of system mode shapes. When substructures are tested on free end boundary conditions, a great number of component modes are required, and testing must cover very high frequencies.
一般社団法人日本機械学会の論文
1985-07-25