FE Model Updating for Damage Detection-Application to a Welded Structure
Finite Element (FE) model updating is initially developed to update numerical models of structures to match their experimentally measured modal properties (i.e.,natural frequencies and modes).In FE model updating,uncertain physical parameters of a structure are modified so that the discrepancies between the numerically estimated and experimentally measured modal properties are minimized.The process of updating is employed not only in parameter identification;it can also be developed for structural damage identification.In this work,a welded structure that is intended to represent a common configuration used in automotive body construction is investigated.It is known that presence of any damage in the welds of such a structure could affect its dynamic behavior.So,in theory modal test data can allow damage to be assessed accurately.As a typical automotive body contains thousands of welds,the effects of damage in the welds could be influential.The FE model updating process using experimental data is presented.It is carried out using NASTRAN optimization code.The procedure aims to adjust the uncertain properties of the FE model (from the weld joints) by minimizing the differences between the measured modal properties and the corresponding numerical predictions.The initial parameter values used in the numerical model are the nominal values.The procedure brings the numerical results of the structure as close as possible to the experimental ones,according to an objective function,therefore altering some of the FE model parameters of the structure.It may be concluded that when the identified values of certain parameters deviates from the nominal values to certain extent,there is a fault or damage at that particular joint.
welds automotive structure finite element model updating damage identification
Nurulakmar Abu Husain Andy Snaylam Hamed Haddad Khodaparast Simon James Geoff Dearden Huajiang Ouyang
Department of Engineering,Harrison-Hughes Building,The University of Liverpool,Brownlow Hill,Liverpool L69 3GH,United Kingdom
国际会议
The 8th International Conference on Damage Assessment of Structures(DAMAS 2009)(第八届结构损伤评价国际学术会议)
北京
英文
393-400
2009-08-03（万方平台首次上网日期，不代表论文的发表时间）