Use of finite-element models for preparation of ground vibration test |
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| Affiliation: | 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Advanced Aero-Engine Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China;1. Institute of Materials Science and Testing of Polymers, Montanuniversitaet Leoben, Otto Gloeckel-Straße 2, 8700, Leoben, Austria;2. Institute of Polymer Processing, Montanuniversitaet Leoben, Otto Gloeckel-Straße 2, 8700, Leoben, Austria;3. Centre for Polymer and Material Technologies, Department of Materials, Textiles and Chemical Engineering, Ghent University, Technologiepark 130, 9052, Zwijnaarde, Belgium;4. Department of Neurosurgery, Medical University of Graz, Auenbruggerplatz 29, 8036, Graz, Austria;1. School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, China;2. Shenyang Institute of Automation Chinese Academy of Sciences, Shenyang, China;3. State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, China;4. National Engineering & Technology Research Center for Digital Switching System, Zhengzhou, China;5. School of Mechanical Engineering, Jiangsu University, Zhenjiang, China;6. Department of Aerospace Engineering, Ryerson University, Toronto, Canada;1. Holcombe Department of Electrical and Computer Engineering, Clemson University, Clemson, SC, United States;2. Department of Genetics and Biochemistry, Clemson University, Clemson, SC, United States |
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| Abstract: | The paper discusses possibilities to make use of the finite element model (FE model) to prepare and analyse ground vibration tests (GVT) on large aircraft. It reports about experiences gained in the preparation stage and of research GVT on an Airbus A340-300.The observability and controllability of the expected structural modes can be investigated on the basis of FE calculations during the preparation of the GVT. By this means, the engineering skill strictly necessary to set up a GVT can be backed up with analytical findings potentially resulting in improvements of the pick-up and excitation plan. During and after the test the performance of orthogonality checks as well as the calculation of generalized masses on the basis of the measured mode shapes and the analytical mass matrix provide useful additional information for the evaluation and interpretation of test results. The detection of deviations of the measurements from the analytical model might influence the test procedure drawing attention towards the least precisely predicted modes which can prove to be very useful for the updating of the FE model.A prerequisite for any activity related to the FE model is a proper association of the test data with the analytical calculations. For this task the use of a generalized static expansion technique is recommended which is a suitable tool during both the preparation and analysis stage of a GVT. |
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