A model-free method for structural damage identification based on dynamic strain sensing of distributed fiber optic sensors
Most of vibration-based damage identification strategies to date are traditionally based on the dynamic responses from accelerometers,velocimeters and displacement transducers.Although various algorithms have been developed to make the most of these dynamic measurements,a challenge remains that these responses in translational degrees of freedom are global quantities of structures and have no clear relationship to a specific local damage even near the transducers.Moreover,the situation for multi-damages will be extremely intricate.The mutual influence of structural damages on these measurements makes it difficult to perform effective structural parametric and damage identification.In contrast,strain is a local response and may be used to concentrate on sensing the structural behavior around a localized region.Furthermore,stain measurements can be directly applied for damage detection with no need for an analytical structural model.Based on dynamic macro-strain measurements distributed throughout the full or some partial areas of structures,a model-free method for damage locating and quantifying algorithm is introduced in this paper.Moreover,this work investigates further the superiority of the proposed strategy for damage identification by comparing with the manners based on various features using acceleration measurements.Both numerical and experimental examples are performed for this comparative study.
model-free damage identification dynamic strain sensing distributed fiber optic sensors acceleration comparative study
Zhishen Wu Suzhen Li
Department of Urban and Civil Engineering Ibaraki University,Japan
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）