- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | SONG Qinghui, XIAO Linjing, JIANG Haiyan, LIU Xiujie, YAN Fangping. Longitudinal Vibration Characteristics of Deep Sea Mining Pipe Based on ABAQUS[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 821-829. doi: 10.3969/j.issn.0258-2724.20210389
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In order to study the longitudinal vibration characteristics of the stepped lifting pipe with a complex structure under the action of the ocean current and mining vessel heave motion, the longitudinal vibration performance of a 5000 m long lifting pipe was analyzed using the vibration theory of continuous elastic rod. Firstly, a mathematical model of the longitudinal vibration of the lifting pipe was established according to the D’Alembert principle, and the natural frequency equation of the pipeline was derived by the method of separating variables. Then, the mass normalization of the vibration mode was carried out. Finally, a finite element model of the lifting pipe was established using ABAQUS software to study the longitudinal dynamic response of the pipeline. The results show that the first-order longitudinal resonance frequency of the lifting pipe is in the frequency band where the wave energy is concentrated in the mining area. With an increase in the buffer mass, the natural frequency of the lifting pipe decreases gradually, and the influence of the buffer mass on the high-order natural frequencies becomes more obvious. With the wave frequency increasing, the longitudinal amplitude, axial force and axial stress first increase and then decrease, and reach their peaks at the first-order natural frequency, which occurs at 5000, 0 and 1000 m along the lifting pipe length, respectively. As the heave amplitude of the mining vessel increases, the dynamic response of the lifting pipe increases gradually; after the heave amplitude is greater than 1.5 m, the growth rate of the dynamic response of the lifting pipe slows down. When the first-order longitudinal resonance occurs in the lifting pipe, the vibration displacement and axial force first increase and then make constant-amplitude steady-state oscillation. With the increase of seawater depth, the vibration amplitude along the length of the pipe increases gradually, the vibration equilibrium position moves down, and the vibration response time is delayed; meanwhile, the axial force and axial stress decrease gradually, and the axial stress between each pipe string segment increases sharply.
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