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| Operational Modal Test of Geotechnical Centrifuge Combined with Acceleration and Vibration |
| Received:March 23, 2019 Revised:May 05, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2019.10.018 |
| KeyWord:modal test, geotechnical centrifuge,vibration and centrifugal field |
| Author | Institution |
| E Lin-zhong-yang |
1. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China;2. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang , China |
| DU Qiang |
1. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China;2. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang , China |
| WANG Yu-jun |
1. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China;2. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang , China |
| LUO Zhao-yu |
1. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China;2. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang , China |
| WEI Xiao-zhen |
1. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China;2. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang , China |
| SUN Ai-jun |
1. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China;2. Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang , China |
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| Abstract: |
| Objective To obtain dynamic characteristics of centrifuge in static and different operating states. Methods In modal test with SIMO identification method, force hammer was used to generate transient excitation, calculate the frequency response functions between excitation point and response points, and obtain the modal parameters (frequency, damping and mode of vibration) of the structure by modal fitting.In operational modal test, structure responses were measured and amplified. Two or more reference points were selected for cross-spectral analysis to obtain operational modal parameters. Results When the centrifuge was stationary, the first two modes were deflection around Y axis and X axis; the frequencies were 3.23 Hz and 9.94 Hz respectively; and the first order bending frequency was 11.17 Hz. With different rotational accelerations, the first working frequency was rotational frequency, and the second working mode was deflection around Y axis. The frequency increased with the increase of rotational acceleration. Conclusion Modal parameters under the static and different operating conditions of the centrifuge are obtained through modal test analysis, which can provide reference for modification, structural design and optimization of finite element model. |
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