Damage Localization in a Space Truss Model Using Modal Strain Energy Distribution
This paper summarizes the experimental program, the modal test results, the extracted modal shapes and an analysis implemented to localize the damage via modal strain energy distribution. The modal test results consist of the vibrational signatures due to different damages on the structure. The extracted modal results are implemented in a global damage detection/evaluation theory bared on modal swain energy distribution. The strain energy distributions due to the static shapes of the modes are computed before and after the inflicted damage. The differences from the normalized strain energy distributions are multiplied timer element weight factors proportional to the strain energy distribution of the damaged structure. The weighted modal strain energy differences are lumped into the connecting nodes of the elements to provide indications of the locution of the inflicted damage. The technique is able to locate the complete damage and the partial damage, but was no, able to detect the GUI damage.