Longitudinal vibration compensation model of stepped-pipe strings in deep-sea mining

In this paper, the dynamic model of the rigid space stepped-pipe strings system is derived with Lagrangian method to represent the system dynamic behaviors which enriches the analysis method of longitudinal vibration of stepped-pipe strings. The stepped-pipe strings is constructed of pipes with diff...

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Bibliographic Details
Published in:PloS one 2020-11, Vol.15 (11), p.e0241650-e0241650
Main Authors: Song, QingHui, Jiang, HaiYan, Song, QingJun, Xiao, Linjing, Liu, Qiang
Format: Article
Language:English
Subjects:
Absorbers
Axial forces
Compensation
Computer and Information Sciences
Computer Simulation
Damping ratio
Deep sea
Deep sea mining
Dynamic models
Engineering and Technology
Exact solutions
Heave compensation systems
Marine mineral resources
Materials
Mechanical properties
Methods
Mineral resources
Mining
Modal analysis
Models, Theoretical
Numerical simulations
Physical properties
Physical Sciences
Pipes
Production processes
Sea breezes
Ships
Strings
Vibration
Vibration analysis
Vibration control
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Summary:In this paper, the dynamic model of the rigid space stepped-pipe strings system is derived with Lagrangian method to represent the system dynamic behaviors which enriches the analysis method of longitudinal vibration of stepped-pipe strings. The stepped-pipe strings is constructed of pipes with different diameters and lengths, the physical properties of which mainly depends on the axial force and the depth of deep-sea mining. Based on lumped element method, the heave compensation system with dynamic vibration absorber is designed for longitudinal vibration suppression of the stepped-pipe strings. The analytical solution is obtained by modal analysis method when the mining ship is subjected to sea breeze excitation. The proposed method is easily implementable for rigid space stepped-pipe strings system with complex multi-degree-of-free deep-sea mining dynamic model. Furthermore, the optimal combination of mass ratio, spring coefficient and damping ratio is shown to have a better vibration suppression performance. Finally, numerical simulations on the stepped-pipe strings system with or without dynamic vibration absorbers are provided to demonstrate the effectiveness of the proposed method.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0241650