基于柔度矩阵和模糊模式方法的结构损伤识别研究

RESEARCH ON DAMAGE IDENTIFICATION METHOD BASED ON FLEXIBILITY MATRIX AND FUZZY PATTERN

根据工程结构损伤识别的特点,提出一种分步识别结构损伤的方法,首先利用测试模态参数,确定结构柔度矩阵,并通过损伤前后柔度矩阵变化特点确定结构损伤位置,然后在确定损伤位置的基础上,通过模糊模式识别方法对结构损伤程度进行识别,最后通过对一个桁架结构的算例表明,该识别方法稳定性好,抗噪声能力强,能较准确地识别结构的损伤程度,在工程应用中具有一定的实用价值。

Based on the characteristic of damage identification for engineering structure, a method of damage identification is put forward. First, with test modal reference the flexibility matrix of structure is set. And by the eharaeterristie of the change in flexibility matrix before and after the damage to the structure, the position of damage in structure is found. Then based on that position, the damage state in structure is idertifieated by method of fuzzy pattern recognition. At last, by giving a calculation example of a truss structure, it proves that the method has better stability, better anti-noise, and is much more accurate in identification, so it is very practical in engineerings.