基于模型修正理论和频响函数模式置信准则的简支梁损伤动力评估方法

发布时间：2018-06-23 06:49

本文选题：简支梁 + 频响函数　；参考：《土木工程学报》2017年08期

【摘要】：提出了一种基于频响函数模式置信准则的改进模型修正方法,用以识别各部位的损伤指数,从而对简支梁的损伤进行定量评估。加工制作了4片模型简支钢梁,用切割截面的方式模拟了损伤,进行了动力测试,并利用所提方法进行了损伤识别。简支钢梁数值模拟和模型试验结果表明:利用相邻测点间频响函数模式置信准则指数构造目标函数时,可有效增加识别变量的个数;第1阶频率和第2阶频率之间的区段内频响函数对损伤灵敏度较高,可用SAC指数计算和简支梁损伤识别;所提损伤评估方法对测试系统误差和噪声不敏感,可实现对多个位置损伤的同步定位和定量识别;在传感器数量有限的情况下,采用分步识别法可以实现对损伤位置的逐步接近和损伤程度的精细化识别。
[Abstract]:An improved model modification method based on the confidence criterion of frequency response function (FRF) is proposed to identify the damage index of different parts and to quantitatively evaluate the damage of simply supported beam. Four pieces of model simply supported steel beams were manufactured, the damage was simulated by cutting section, the dynamic test was carried out, and the damage identification was carried out by using the proposed method. The results of numerical simulation and model test of simply supported steel beams show that the number of identifying variables can be increased effectively when the objective function is constructed by using the confidence criterion of frequency response function mode between adjacent measuring points. The frequency response function between the first frequency and the second frequency has high sensitivity to damage, which can be calculated by SAC exponent and damage identification of simply supported beam, and the proposed damage assessment method is not sensitive to the error and noise of the test system. In the case of limited number of sensors, step by step identification method can be used to realize the gradual approach of damage location and the fine identification of damage degree.
【作者单位】：北京交通大学;中交公路规划设计院有限公司;
【基金】：国家自然科学基金(51678032) 国家973计划项目(2013CB036203) 中国铁路总公司科技研究开发计划项目(2015G006-M)
【分类号】：TU317

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