结构损伤识别中的生物地理学优化算法

Biogeography-based optimization algorithm for structural damage detection

为将生物地理学优化(BBO)算法有效应用于结构损伤识别中,结合余弦迁移模型、自适应迁入函数和精英机制对算法进行改进。以简支梁结构为例,进行不同损伤情况下的损伤位置和损伤程度的识别。算例计算结果表明,改进后的算法在结构损伤识别中具有计算简便、收敛速度快、识别精度高、稳定性好的特点,相比于BBO性能明显提升,能够在结构损伤识别问题中加以有效地应用。

In order to apply the biogeography-based optimization（ BBO） algorithm to the structural damage detection,the algorithm is improved with the cosine migration model,the adaptive immigration function and the elitist mechanism. With the example of a simply supported beam under different damage situations,BBO algorithm is applied to detect not only the damage position but also the damage degree. The result indicates that compared with previous BBO algorithm,the improved one has the advantage of easier calculation,faster convergence speed,higher identification precision,and better stability,thus it can be effectively applied to the structural damage detection.