A three-step damage detection procedure using modal data is developed for space trusses. The procedure is based on determining parameters associated with member stiffness matrices using a system identification technique. The first step is the refinement of the matrix using modal data from the undamaged structure. A modal residual vector is then used to determine whether or not damage has occurred. If it has, a minimization scheme is used to determine the parameters for only those members found to have been damaged. An eight-bay, hybrid-scaled truss designed and tested at NASA's Langley Research Center is used to verify the procedure. One damage case is used to illustrate the success of the procedure.
展开▼
机译:使用模态数据的三步损伤检测程序为空间桁架开发。该过程基于使用系统识别技术确定与成员刚度矩阵相关联的参数。第一步是使用来自未损坏结构的模态数据进行矩阵的改进。然后使用模态残留载体来确定是否发生了损坏。如果有的话,最小化方案用于确定只有那些发现已损坏的成员的参数。在NASA的Langley Research Center设计和测试的八架混合级桁架用于验证程序。一个伤害案例用于说明程序的成功。
展开▼