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| Multi-point Time Domain Load Identification of Connection Interface at Middle and Far Fields in Explosion Separation |
| Received:January 15, 2024 Revised:April 02, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.07.011 |
| KeyWord:explosion separation multi-point excitation load identification Duhamet integral ill posedness optimization |
| Author | Institution |
| HU Jie |
Institute of System Engineering, China Academy of Engineering Physics, Sichuan Mianyang , China;Key Laboratory of Engineering Material and Structure Impact and Vibration, Sichuan Mianyang , China |
| FANG Ye |
Key Laboratory of Engineering Material and Structure Impact and Vibration, Sichuan Mianyang , China |
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| Abstract: |
| The work aims to establish an identification method of multi-point time domain load of connection interface at middle and far fields under the explosion separation impact profile, and analyze and evaluate the structural dynamic response characteristics of the product. Based on the discretization of the Duhamet integral, the structural dynamics analysis method was adopted to establish a transfer function between multiple measurement points (including multiple degrees of freedom) on the product and the force loads acting on the critical interface in the time domain. The force excitation was obtained through load identification, especially that the steepest descent method was used to overcome the ill posedness of the identification algorithm. Finally, the structural response under the identified load was analyzed by the finite element method, providing a basis for evaluating the structural dynamics response. The time domain loads of multiple points and degrees of freedom on the critical interface connecting the explosive bolt box and the product were obtained. The simulated response generated by this load was consistent with the measured data and the dynamic response distribution of the structure was analyzed and obtained. This research proposes a method for identifying multi-point dynamic loads on key interfaces at middle and far fields of explosive load transmission path, and the effectiveness of this method is verified through numerical simulation, which can support the dynamic response evaluation of the structure. |
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