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| Reformulation of FRF-based Substructuring Method and Its Applicationin Environment Prediction |
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| DOI：10.7643/issn.1672-9242.2023.04.004 |
| KeyWord:FRF-based substructuring method random vibration environment prediction frequency response function transfer function displacement impedance |
| Author | Institution |
| CHEN Jiang-pan |
Beijing Institute of Electronic System Engineering, Beijing , China |
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| Abstract: |
| The work aims to efficiently and precisely predict the random vibration environment of complex structure systems according to the FRF-based substructuring method. First of all, the FRF-based substructuring method considering elastic connections was reformulated based on the Sherman-Morrison-Woodbury formula to break the bottleneck that the application field of the existing method was limited by the singularity of displacement impedance matrix of elastic connection systems. Secondly, according to the transformation relationship between the force-displacement frequency response function and the acceleration transfer function of complex structure systems, the prediction method for random vibration environment based on the FRF-based substructuring method was proposed. A simulation example for "simulating random vibration experiment" was designed. The finite element model and the method proposed in this work were used to predict the simulation and calculation of the random vibration environment for the simulation example. The predicted results of the two methods were consistent. A random vibration environment prediction method based on the FRF-based substructuring method is proposed. It provides a new idea for environmental prediction of complex structure systems. |
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