Transactions of Nanjing University of Aeronautics & Astronautics
Damage Identification of General Overhead Travelling Crane Structure Based on Model Updating by Sensitivity
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Abstract:
A model based damage identification was proposed by facilitating parameter sensitivity analysis and applied to a general overhead travelling crane. As updating reference data, experimental modal frequency was obtained by operational modal analysis (OMA) under ambient excitation. One dimensional damage function was defined to identify the damage by bending stiffness. The results showed that the model updating method could locate the damage and quantitatively describe the structure. The average error of eigenvalues between updated model analysis and the experimental results was less than 4% which proved the accuracy reliable. The comparison of finite element analysis and the test results of the deflection under the capacity load further verified the feasibility of this method.
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