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| Dynamic Simulation of Boundary Conditions in Environment Vibration Experiment |
| Received:June 25, 2018 Revised:September 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.09.015 |
| KeyWord:environment vibration experiment dynamic boundary condition modal frequency mode shape optimal design |
| Author | Institution |
| HE Shi |
Aircraft Strength Research Institute of China, Xi'an , China |
| WANG Long |
Aircraft Strength Research Institute of China, Xi'an , China |
| ZHANG Zhi-jun |
Aircraft Strength Research Institute of China, Xi'an , China |
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| Abstract: |
| Objective To improve the reliability of environment vibration experiment. Methods A typical titanium alloy honeycomb sandwich panel test article was taken as an example. A method for simulating dynamic boundary conditions was proposed. In this method, the test article was connected with the elastic connectors around, and then was connected with the vibration table through a rigid transfer tool, to simulate the dynamic boundary conditions of the test article, with modal frequency and mode shape of the elastic connector as the optimization targets, and with the outline dimension and thickness of the elastic connector as optimization variables. Results The optimization of the elastic connector made the difference between the first two modal frequency of the test article and the test requirements be less than 8%. Location of nodal line of modal shape were coincidence with the test requirement. The design objective for the actual dynamic boundary conditions of simulating the test article was realized. Conclusion The method which introduces elastic connector based on the traditional rigid fixture could simulate dynamic boundary conditions of the test article well, and improve reliability of environment vibration experiment. At the same time, the method has little influence on the expenses and the period of the experiment, which would have good engineering application prospects. |
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