CAJ | 학술논문

文章揭示了模态的跳跃现象对振动分析的影响，并给出了一种新的结构优化设计的方法。首先通过特征分析获得了频率密集程度不同的3种密频状态系统，并给出了接近密频与接近重频系统的概念，同时指出密、重频系统存在模态跳跃现象；其次对设计参数取不同值时所对应的多个密、重频系统，利用频响函数矩阵计算结构在简谐激励下的动力响应；最后通过响应曲线的对比分析，得出有关模态跳跃现象对振动分析影响的结论。
문장게시료모태적도약현상대진동분석적영향，병급출료일충신적결구우화설계적방법。수선통과특정분석획득료빈솔밀집정도불동적3충밀빈상태계통，병급출료접근밀빈여접근중빈계통적개념，동시지출밀、중빈계통존재모태도약현상；기차대설계삼수취불동치시소대응적다개밀、중빈계통，이용빈향함수구진계산결구재간해격려하적동력향응；최후통과향응곡선적대비분석，득출유관모태도약현상대진동분석영향적결론。
The effect of modal jumping phenomenon on vibration analysis was discussed ,and a new method of structural optimization design was proposed .Firstly ,three kinds of closed‐frequency sys‐tems with different closed extents were obtained by eigenproblem analysis ,and the concepts of quasi‐closed‐frequency system and quasi‐multiple‐frequency system were defined .It was stated that the mo‐dal jumping phenomena exist exactly in closed‐frequency and multiple‐frequency systems .Secondly , in terms of several closed‐frequency and multiple‐frequency systems corresponding to different values of design parameters ,the dynamic responses of them under simple harmonic excitation were computed based on frequency response matrix .Finally ,some conclusions about the effect of modal jumping phe‐nomenon on vibration analysis were drawn through contrasting different response curves obtained .