基于正则化频率变化率的排架渡槽支撑体系损伤定位研究

Study on damage location of aqueduct support system based on normalized change ratio of frequency

针对目前渡槽的支撑体系易出现的健康状况问题,提出了基于固有频率变化率指纹的渡槽支撑体系损伤定位方法。采用CFD(computational fluid dynamics)方法计算不同水深工况下矩形损伤渡槽-水耦合体的自振频率,并进行正则化分析,得到在不同水深条件下,不同损伤程度的正则化频率变化率变化关系并不受水体影响。根据相似理论,建立排架渡槽的正则化频率变化率指纹库并对排架渡槽支撑体系进行损伤定位。研究结果表明:运用正则化频率变化率指纹法进行渡槽损伤定位是可行的,为渡槽损伤的进一步研究提供了思路。

Aimed at the health problem of aqueduct support system,the paper proposed a method which determine the damage position of aqueduct support system based on the change rate of natural frequency. CFD（ computational fluid dynamics） method was applied to calculate the natural frequency of the rectangular damaged aqueduct- water coupling body under the condition of different water depths. The results show that the condition of different water depths and degrees of injury do not affect regular rate of change frequency. Based on similarity theory,the fingerprint database was established to research the damage location of aqueduct support system. The results indicated that the method which uses fingerprint of the rate of change frequency of aqueduct to judge the damage location is feasible. The results provide a guideline for further study of aqueduct damage.