Model-based flaw localization from perturbations in the dynamic response of complex mechanical structures

Chambers, D H

关键词: DEFECTS;    DETECTION;    MAINTENANCE;    MECHANICAL STRUCTURES;    MONITORS;    REPAIR;    SCHEDULES;    SYMMETRY;   

DOI  :  10.2172/948655
RP-ID  :  LLNL-TR-410827
PID  :  OSTI ID: 948655
Others  :  TRN: US200908%%51

学科分类：工程和技术（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

A new method of locating structural damage using measured differences in vibrational response and a numerical model of the undamaged structure has been presented. This method is particularly suited for complex structures with little or no symmetry. In a prior study the method successively located simulated damage from measurements of the vibrational response on two simple structures. Here we demonstrate that it can locate simulated damage in a complex structure. A numerical model of a complex structure was used to calculate the structural response before and after the introduction of a void. The method can now be considered for application to structures of programmatic interest. It could be used to monitor the structural integrity of complex mechanical structures and assemblies over their lifetimes. This would allow early detection of damage, when repair is relatively easy and inexpensive. It would also allow one to schedule maintenance based on actual damage instead of a time schedule.