Element level structural damage detection with unknown excitation

摘要：

A finite-element based time domain system identification algorithm is proposed to identify the element parameters of structures subject to some unknown(unmeasured)excitation inputs.In the algorithm,only limited numbers of acceleration measurements of structures are utilized.Structure state vectors are treated as implicit functions of structural dynamic parameters and excitations.The unknown structural dynamic parameters and excitation inputs are identified by an algorithm based on recursive least squares estimation with unknown excitations(RLSE-UI).Structural damage at element level is detected by the degrading of stiffness of damaged structural elements.Numerical simulation results of a three-story plan shear building with proportional damping and a one-story plane steel frame structure with Rayleigh damping demonstrate that the proposed algorithm can identify structural element stiffness parameters and detect structural damage at element level with good accuracy.

关键词： Damage detection system identification unknown input time domain analysis recursive leastsquaresmethod finite element model

作者: Y. Lei J.Y. Lei Y. Song

作者单位: Department of Civil Engineering,Xiamen University,Xiamen,China

会议类型: 国际会议

会议名称: 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)

会议地点: 重庆·南京

会议语种:英文

在线出版日期: 2007-05-01（万方平台首次上网日期，不代表论文的发表时间）