Modification of Finite Element Modeling of Cable Tray Based on Measured Data
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Abstract
The complex bolted structure of cable tray in the finite element model have been simplified, the cable tray finite element model is modified based on the measured data. The modal analysis of cable tray structure is carried out by ANSYS finite element analysis software, X and Y to the overall vibration of the first order modal natural frequencies is extracted. In order to validate the model, the white noise excitation experiment is designed, and the modal identification was carried out by using the stochastic subspace identification, and measured data of the structure was obtained. The bolt parameters are corrected by using virtual material. The relative error of the modal frequencies and measured frequency is 1.3% in X direction, and it is 26.7% in Y direction before modification. Similarly, the relative error of the modal frequencies and measured frequency is 0.04% in X direction, and it is 2.2% in Y direction after modification.The modified cable tray model is used for process analysis, the results of simulation and experimention are compared, the results shows that the modified finite element model simulation results are in good agreement with the experimental results, it can be more truly reflect the structural dynamic characteristics.
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