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| Application of FRF Based Sub-structuring Method in Prediction of Mechanical Environment |
| Received:September 08, 2018 Revised:November 25, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.11.005 |
| KeyWord:FRF Based Sub-structuring Method mechanical environment prediction rigid joint elastic joint spatial beam element |
| Author | Institution |
| CHEN Jiang-pan |
Beijing Institute of Electronic System Engineering, Beijing , China |
| WANG Dong |
Beijing Institute of Electronic System Engineering, Beijing , China |
| LIU Yi |
Beijing Institute of Electronic System Engineering, Beijing , China |
| LIU Yan |
Beijing Institute of Electronic System Engineering, Beijing , China |
| ZHANG Wei-wen |
Beijing Institute of Electronic System Engineering, Beijing , China |
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| Abstract: |
| Objective To predict the mechanical environment of structure correctly and efficiently with FRF Based Sub-structuring Method (FBSM). Methods The FBSM employed to predict the mechanical environment of structure with rigid and elastic joint were deduced, respectively. Meanwhile, two example structures, with rigid and elastic joint respectively, were designed to validate the obtained FBSMs via comparing the corresponding calculation results of FRF achieved through FBSM and Finite Element Method (FEM). The elastic joint was equivalent with spatial beam element and the advantages of this equivalent method were compared with 6-DOF scalar spring to simulate the elastic joint. Results The calculation results obtained by FBSM were in good agreement with them achieved via FEM no matter the joint was rigid or elastic. Additionally, since the node stiffness matrix of the spatial beam element was a non-diagonal matrix, spatial beam element held the advantages of simulating the actual engineering elastic joint more precisely compared with 6-DOF scalar spring. Conclusion FBSM could predict the mechanical environment of structure correctly and efficiently. Moreover, the spatial beam element and other equivalent elastic connection could be used to predict mechanical environment of elastic connection structure. |
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