摘要
本文计算了无损板在给定模态下各单元的能量,求得每个单元对该阶模态下全板能量的贡献,并通过模态实验得到损伤前后各阶固频的变化.分析发现两者之间存在着内在联系,从而得到一种分析小损伤位置和范围的新方法.
Fault diagnosis of composite material structure is increasingly followed with great interest. It is attractive to diagnosize damage by means of vibration technique. In this paper,a new energy diagnostic method is used for damage detection of composite laminated plates. The damage quantity and its location can be easily and accurately judged by evaluating the modal energy distribution of undamage composite laminated plates and measuring the eigen-frequency reduction caused by the damage. An important conclusion of this method is that the ratio of each order modal energy contribution in one element or domain is equal to the ratio of the change rate of each eigen-frequency approximately if the same element or domain is damaged. Energy distribution diagrams are given for analysis. The results of illustrative examples and experiments show that the method proposed is both effective and feasible.
出处
《振动工程学报》
EI
CSCD
1991年第4期54-58,共5页
Journal of Vibration Engineering
关键词
复合材料
层合板
固有频率
composite materials, laminated plates, natural frequency, fault diagnosis, modal test
