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Mechanical characteristics analysis and control algorithm for floating raft system with mass variation.

Liang Shi1,2, Guanghui Cheng1,2, Wenjun Bu3,4

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|June 10, 2023
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Summary
This summary is machine-generated.

Ship floating raft systems face challenges with changing liquid mass affecting equipment stability. An adaptive control method stabilizes raft displacement and ensures vibration isolation performance.

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Area of Science:

  • Marine Engineering
  • Mechanical Vibration
  • Control Systems

Background:

  • Ship floating raft systems integrate liquid tanks and rafts for equipment vibration isolation.
  • Variable liquid mass in tanks causes raft displacement, altering modal characteristics and stability.
  • This poses risks to equipment safety and degrades vibration isolation performance.

Purpose of the Study:

  • To analyze the impact of time-varying liquid mass on ship floating raft systems.
  • To investigate changes in raft displacement, isolator load distribution, and modal frequencies.
  • To develop and validate an adaptive control method for maintaining system stability.

Main Methods:

  • Established a mechanical analysis model for floating raft systems with time-varying liquid mass.
  • Analyzed the effects of mass change (up to 40% of total raft mass) on system dynamics.
  • Proposed and tested an adaptive variable load control method for raft attitude balance.

Main Results:

  • Liquid mass variation significantly displaces the raft and alters low-order modal frequencies.
  • The proposed adaptive control method effectively manages raft displacement.
  • Controlled raft displacement from approximately 10 mm to 1.5 mm under variable load conditions.

Conclusions:

  • Variable liquid mass in ship floating raft systems presents significant challenges to equipment safety and performance.
  • The developed adaptive variable load control method successfully mitigates these challenges.
  • This method ensures the stability and reliability of vibration isolation systems in dynamic marine environments.