摘要
提出了一种基于反馈控制结构动力特性的损伤统计识别方法。该方法采用基于独立模态空间的反馈控制法,有目的地配置闭环系统的极点,根据损伤前后闭环系统的特征值构造损伤指标,并以该损伤指标构造统计量,采用假设检验法识别损伤是否发生。三跨梁和Benchmark结构的数值算例表明该文提出的损伤识别方法能够较显著地提高损伤指标的灵敏度,在低信噪比的环境下能准确有效地检测结构小损伤是否发生。
A statistical method using dynamic characteristics of structures under control is proposed for detecting small damages. In the study, feedback control based on independent modal space control is used to assign the pole of the system intentionally. A damage indicator consisting of eigenvalues of the close-loop systems with and without damages is proposed and utilized to constitute the statistical quantity. Therefore, hypothesis test method is employed to identify the occurrence of damages. Simulation results obtained from a three-span continuous beam and a Benchmark structure show that the sensitivity of the damage indicator can be enhanced greatly by using the proposed method. The proposed damage detection method is capable of detecting the occurrence of small damage of structures with lower signal-to-noise ratio.
出处
《工程力学》
EI
CSCD
北大核心
2008年第1期116-121,136,共7页
Engineering Mechanics
基金
国家自然科学基金项目(50479050)
关键词
损伤检测
小损伤
受控结构
动力特性
独立模态空间控制
假设检验
damage detection
small damage
controlled structure
dynamic characteristics
independent modal space control
hypothesis test
