结构运营模态测-辨相和理论  

Intercoordination theory of testing and identification for structural operational modes

作　　者：伊廷华[1] 周广东[2] 曲春绪[1] 李宏男[1] Yi Tinghua;Zhou Guangdong;Qu Chunxu;Li Hongnan(Dalian University of Technology,Dalian 116023,China;Hohai University,Nanjing 210098,China)

机构地区：[1]大连理工大学,辽宁大连116023 [2]河海大学,江苏南京210098

出　　处：《土木工程学报》2020年第10期72-81,88,共11页China Civil Engineering Journal

基　　金：国家重点研发计划(2019YFC1511000);国家自然科学基金(51625802,51978128,51678218)。

摘　　要：运营模态是表征实际工程结构动力特性的重要参数。从结构动力学基本理论出发,阐释了振动测试与模态识别的动力学互馈本质,指出传统模态测试精度不高的根本原因在于两者的割裂操作,提出"振动测试正向服务模态辨识、模态辨识逆向指导振动测试"的动力学统一范畴,建立了结构运营模态测-辨相和理论,给出由响应强度、识别误差和重构精度三大系列评价准则构成的理论体系框架,以健康监测基准模型模拟数据和某大跨径桥梁实测数据为例,共同印证该理论可有效解决以往振动测试的盲目性和模态识别的被动性。文末,总结并展望了结构运营模态测-辨相和理论的发展趋势。The operational mode is an important parameter for describing the dynamic characteristics of practical structures.Based on the basic theory of structural dynamics, the essence of the dynamic mutual feedback mechanism between the vibration testing and the modal identification is explained.The primary reason for the low accuracy of traditional modal testing is the separation of the vibration testing and the modal identification.The concept of dynamic coordination, with the vibration testing serving the modal identification in a forward way and the modal identification guiding the vibration testing in a backward way, is put forward. Following that, the intercoordination theory of testing and identification for obtaining structural operational modes is established.Furthermore, the theoretical framework consisting of the criteria of the response strength, the identification error and the reconstruction accuracy is developed.Based on the simulation data of a structural health monitoring benchmark model and the field measured data of a long-span bridge, it is concluded that the intercoordination theory can effectively solve the blindness of the vibration test and the passiveness of the modal identification.At the end, the future work of the intercoordination theory for structural operational modes was summarized.

关 键 词：运营模态 测-辨相和理论 振动测试 测点优选 模型修正 

分 类 号：TU311.3[建筑科学—结构工程]