Abstract
A new damage identification method with a fusion index to locate the damage position and identify the damage extent of beam structures is presented by integrating the modal strain energy and natural frequency sensitivity. The modal strain energy, which is with the limitation on obtaining the damage extent, is adopted to locate the damage position with avoiding the interference of structure itself. The natural frequency sensitivity, which is with false detection and interference happening when solely used, is adopted for identifying the damage extent. In order to further improve the precision of the damage quantification, additional masses are added on the beam structure to obtain more information about the natural frequency sensitivity. Then, the fusion index for damage identification is established through combining the modal strain energy and the natural frequency sensitivity before and after adding masses on beam structures. The results obtained by finite element analysis and experimental tests show that the presented method can locate and quantify damages on beam structures in an accurate and convenient way.
Highlights
Structures such as architectural structures, mechanical structures and vehicle structures are correlated with all around of people’s lives
The dynamic characteristic of the structure is the intrinsic property of the structure and it can be changed if the damage exists
This study proposes a simple damage identification method which combines both advantages of using modal strain energy and natural frequency variation
Summary
Structures such as architectural structures, mechanical structures and vehicle structures are correlated with all around of people’s lives. The method proposed by Shi et al [13, 14] based on the variation of modal strain energy in each element shows good results on locating single as well as multiple damages. Hu et al [24] proposed a CMSE (cross-modal strain energy) method which combines both modal shapes and modal frequencies in the estimation of damage extent including scenarios with single or multiple damages. This study proposes a simple damage identification method which combines both advantages of using modal strain energy and natural frequency variation. Results from finite element analysis as well as elaborated experiments demonstrate the proposed integrated method can locate and quantify damage and precisely
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