由有限多个传感器测点诊断结构破损位置的试验研究

EXPERIMENT OF STRUCTURAL DAMAGE LOCALIZATION FROM LIMITED SENSOR INFORMATION

提出了结构动态试验传感器测点位置的优化方法 ,发展了基于有限多个传感器测点信息的结构破损定位方法。该方法以结构各自由度的破损信息为条件 ,通过优化方法从结构的全部自由度中去掉那些所含结构破损信息很少的自由度 ,得到了有限个传感器测点的数目和位置 ,并且运用灵敏度分析和相关性分析方法 ,建立了直接利用不完整的实测模态振型诊断结构破损位置的破损定位方法 ,解决了测试振型不完整给结构破损诊断带来的困难。空间桁架结构破损诊断的实验研究表明 ,该方法能成功地诊断出结构单个或多个破损的位置。

A method of optimizing sensor placement in the structural dynamic test and localizing structural damage from limited sensor information in a structure is presented in this paper. The sensor placements are optimized according to the ability of collecting structural damage information for each degree of freedom (DOF) of the structure. Only a limited number of structural DOF including plentiful damage information are instrumented. Incomplete mode shapes yielded from these limited sensor placements are directly used to localize structural damage so that the incompleteness of experimental mode shape to block the development of structural damage detection is solved. Experimental research shows that the proposed method can be successfully used to localize single or multiple damages on the three dimension truss structure.