基于改进萤火虫算法的结构损伤识别

发布时间：2018-01-01 22:22

本文关键词：基于改进萤火虫算法的结构损伤识别　出处：《中山大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：提出一种基于改进萤火虫算法的结构损伤识别方法。将结构损伤模拟成杨氏模量的减少。对于没有邻居的萤火虫,让它们在自身位置附近随机搜索,同时引入新的移动方式来提高算法的精度和收敛速度,避免算法过早的陷入局部最优,克服萤火虫算法在高维目标函数中寻优能力不足的问题。采取功能梯度梁(Axial functionally graded,AFG)作为研究对象,利用欧拉-伯努利梁单元建立力学模型。采用了简支梁作为算例,将结果和基本萤火虫算法、领导者萤火虫和自适应步长萤火虫算法作对比,说明改进的有效性。
[Abstract]:A structural damage identification method based on improved firefly algorithm is proposed. The structural damage is simulated as the reduction of Young's modulus. For fireflies without neighbors, they are randomly searched near their own location. At the same time, a new moving method is introduced to improve the accuracy and convergence speed of the algorithm, so as to avoid premature fall into the local optimal algorithm. In order to overcome the problem of lack of optimization ability of firefly algorithm in high-dimensional objective function, the functionally gradient functionally weighted functionally (AFG) is used as the research object. The mechanical model is established by using Euler-Bernoulli beam element. The simply supported beam is used as an example to compare the results with the basic firefly algorithm, the leader firefly and the adaptive step size firefly algorithm. Demonstrate the effectiveness of the improvement.
【作者单位】：中山大学工学院;
【基金】：国家自然科学基金(11572356) 广东省自然科学基金(2015A030313126) 广东省科技计划项目(2016A020223006)
【分类号】：TP18;O346.5
【正文快照】： 功能梯度梁有着出色的力学和热学性能,被广泛应用于各个领域,例如空间和平面桁架,航天器的热防护盾等[1-3]。由于功能梯度梁被应用于各种各样恶劣的环境中,对于它们的结构损伤识别显得尤为重要。结构损伤识别主要分为时域和频域两种。频域法主要根据结构的固有频率、模态、柔

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