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| A Method and its Application for Improving the Validity of Ground Testing of Mechanical Environment’s effects on Aircraft Structure |
| Received:August 12, 2016 Revised:September 09, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.05.002 |
| KeyWord:vibration test mapping relation model finite element analysis test validity |
| Author | Institution |
| 阎桂荣 |
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| 董龙雷 |
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| 宋利强 |
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| Abstract: |
| Objective To study the way of improving the validity of the aircraft structure ground test. Methods The finite element models of the specimen structure in flight and ground test condition are calculated, then the test model of the specimen structure in ground testing is measured to verify the validity of the finite element model. The vibration response of feature points in flight and ground testing are calculated; the mapping relation model of the feature points is calculated by machine learning methods, then the responses of each point in ground testing is determined by the flight telemetry data. Finally, the load imposed on the test system is determined. Results With a slender body structure as an example,the maximum relative error between the finite element model and measured model of the test system is 6.76%. Using measurring points during ground testing and the mapping relation model, the vibration response of the feature points in flight state can be predicted; the vibration response of the corresponding ground testing points can be determined and the equivalent load on these ponints can be solved using the method of load reverse. Thus, the last load to be applied to the test system can be determined.Conclusion By the unified method of the flight-ground numerical calculation and the ground testing, the load to be applied in the ground test can be determined without deliberately simulating the boundary conditions in flight state, which improves the validity of the aircraft ground testing. |
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