基于模态振型的简支梁损伤识别

Damage Identification of Freely Supported Beam Based on Mode of Vibration

相比结构的频率,振型反应的信息更加丰富.振型曲率是对结构损伤十分敏感的一个指标;利用简支梁结构损伤前后的1阶振型曲率差对其进行损伤识别,对损伤位置有较好的识别效果,而利用高阶振型无法进行识别;对于简支梁损伤程度,利用振型曲率差只能进行定性的识别,随着损伤程度的加深,图形突变增大.

Compared with the frequency of structure, the vibration reaction information is more abundant. The curvature of vibration is a sensitive index of structure damage. To identify the location of freely sup- ported beam damage, the difference of mode of vibration 1 is used,but the high rank mode of vibration can- not be used to identify. For the degree of damage, we can identify the qualitative only. With the damage degree deepening, the graph becomes more obvious.