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

QingHui Song1, HaiYan Jiang2, QingJun Song2

  • 1Department of Mechanical and Electronic Engineering, Shandong University of Science & Technology, Qingdao, Shandong, China.

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|November 9, 2020
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Summary
This summary is machine-generated.

A new dynamic model and vibration absorber system effectively suppress longitudinal vibrations in deep-sea mining pipe strings. This method enhances the analysis of stepped-pipe strings, crucial for stable deep-sea operations.

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Area of Science:

  • Mechanical Engineering
  • Ocean Engineering
  • Vibration Analysis

Background:

  • Deep-sea mining operations involve complex stepped-pipe strings whose physical properties are influenced by axial force and depth.
  • Longitudinal vibrations in these pipe strings can significantly impact the stability and efficiency of deep-sea mining.
  • Existing analysis methods for stepped-pipe strings may not fully capture dynamic behaviors in complex deep-sea environments.

Purpose of the Study:

  • To derive a dynamic model for rigid space stepped-pipe strings using the Lagrangian method.
  • To design a heave compensation system with a dynamic vibration absorber for longitudinal vibration suppression.
  • To validate the effectiveness of the proposed method through analytical solutions and numerical simulations.

Main Methods:

  • Lagrangian method for deriving the dynamic model of the rigid space stepped-pipe strings system.
  • Lumped element method for designing the heave compensation system with a dynamic vibration absorber.
  • Modal analysis for obtaining analytical solutions under sea breeze excitation.
  • Numerical simulations to demonstrate vibration suppression performance.

Main Results:

  • The derived dynamic model accurately represents the dynamic behaviors of stepped-pipe strings.
  • The designed dynamic vibration absorber effectively suppresses longitudinal vibrations.
  • Optimal combinations of mass ratio, spring coefficient, and damping ratio yield superior vibration suppression.
  • The proposed method is easily implementable for complex multi-degree-of-freedom deep-sea mining dynamic models.

Conclusions:

  • The study successfully developed and validated a dynamic model and vibration suppression system for stepped-pipe strings in deep-sea mining.
  • The dynamic vibration absorber significantly enhances the stability of deep-sea mining operations by mitigating longitudinal vibrations.
  • The findings provide a valuable tool for analyzing and improving the performance of deep-sea mining equipment.