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| Dynamic Stiffness Analysis and Test Validation on Connecting Structure of Civil Aircraft |
| Received:June 18, 2018 Revised:September 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.09.007 |
| KeyWord:theoretical analysis on dynamic stiffness fem analysis on dynamic stiffness frequency response analysis dynamic stiffness test hammer test |
| Author | Institution |
| REN Yong-feng |
Shanghai Aircraft Design and Research Institute, Shanghai , China |
| YAN Ling |
Shanghai Aircraft Design and Research Institute, Shanghai , China |
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| Abstract: |
| To get the dynamic stiffness of civil aircraft by analysis and test. Methods Theoretical method was used to get the derivation formula of dynamic stiffness and the FEM software was used to have frequency response analysis to get the dynamic stiffness of connecting structure. Hammer test was also carried out to get data on the dynamic stiffness test and carry out experimental verification. Results The test results were affected by signal attenuation. It was hard to get static stiffness under low frequency. But it could be obtained by model analysis. The test result of dynamic stiffness did not fluctuate greatly in the beginning, tending to be stable in the range of high frequency and was finally stabilized near to the stiffness value. When the dynamic stiffness was not affected much by frequency in analysis results, then the average dynamic stiffness in analysis result can be used as the finally stiffness for different frequency. Conclusion By frequency response analysis, the curve of dynamic stiffness for connecting structure of civil aircraft is get. The FEM method is confirmed by dynamic stiffness test. From the comparison, it can be seen that the FEM method can get the accurate dynamic stiffness and can be used in the engineering practice. |
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