A time Reversal Imaging Method Without Relying on Transfer Function for Impact and Damage Monitoring of Composite Structures
Composite structures adopted in aerospace structures have attracted much interest to structural health monitoring (SHM) for localization of impact and damage positions due to their poor impact resistance properties.Propagation mechanism and frequency dispersion characteristics of Lamb wave signals on composite structures are more complicated than that on simple aluminum plates.Recently,much attention has been paid to the research of time reversal focusing method because this method shows a promising advantage to give a focusing image of the structural damage,improve the signal-to-noise ratio and compensate the dispersion of Lamb wave signals.In this paper,aiming at developing a practical method for on-line localization of impact and damage on aircraft composite structures which can take advantage of time reversal focusing and does not rely on the transfer function,a new phase synthesis based time reversal focusing method is proposed.Impact and damage images are given out directly through time reversal focusing based on phase synthesis process of the signals.A SHM demonstration system is built on a composite panel of an aircraft wing box with many bolt holes and stiffeners using the phase synthesis based time reversal focusing method.The demonstration results show that this method can estimate the positions of impact and damage efficiently with a low sensitivity of velocity errors.
structural health monitoring time reversal focusing phase synthesis impact and damage imaging composite structure
Lei QIU Shenfang YUAN Tianxiang HUANG
The State Key Lab of Mechanics and Control of Mechanical Structures, the Aeronautic Key Lab for Smart Materials and Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
国际会议
济南
英文
542-548
2013-05-18（万方平台首次上网日期，不代表论文的发表时间）