代表モード抽出法による多点入力時の主要振動形状の抽出

抄録

Research on reduction of the number of modes has been made to shorten the analysis time when vibration analysis is performed in a frequency band having a high mode density. In the principal modal analysis, which is a previous study, since the similarity of modes is not taken into consideration, the reduction number may be affected in some cases. Although the similarity is considered in the mode grouping method, the reproducibility of the response by the representative mode is not considered. Therefore, one of the authors proposes a representative mode extraction method to solve these problems. In this research, we conducted the representative mode extraction method at multipoint input and confirmed the reproducibility of response. Since the transfer function can not be calculated at multipoint input, the representative mode was extracted from the response waveform on physical coordinates. In addition, since it is considered to be complicated in consideration of the phase difference, it is treated as having no phase difference this time. When compared with the response reproduction result by the principal modal analysis for the multistage beam model, it was confirmed that the response could be reproduced more accurately with the same number.