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Robust output feedback stabilization for a flexible marine riser system.

Zhijia Zhao1, Yu Liu2, Fang Guo3

  • 1School of Automation Science and Engineering, South China University of Technology, Guangzhou 510640, China; School of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou 510006, China.

ISA Transactions
|December 5, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces an adaptive boundary control to reduce flexible marine riser vibrations, even with uncertain parameters and inaccurate states. The method ensures system stability and accurate state estimation for improved performance.

Keywords:
Boundary controlDistributed parameter systemFlexible marine riserOutput feedback controlRobust adaptive control

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Area of Science:

  • Marine Engineering
  • Control Systems Theory
  • Oceanography

Background:

  • Flexible marine risers are critical offshore structures susceptible to vibrations.
  • Parametric uncertainties and inaccurate state measurements pose significant challenges in controlling riser dynamics.
  • Effective vibration reduction is essential for operational safety and efficiency in marine environments.

Purpose of the Study:

  • To develop an adaptive output feedback boundary control strategy for vibration reduction in flexible marine risers.
  • To address challenges posed by parametric uncertainties and inaccurate system state estimations.
  • To enhance the robustness and stability of marine riser systems under dynamic conditions.

Main Methods:

  • An adaptive output feedback boundary control approach is proposed, integrating observer-based backstepping and high-gain observers.
  • Parameter adaptive laws are designed to compensate for system uncertainties.
  • A disturbance observer is incorporated to mitigate external environmental disturbances.
  • Lyapunov analysis is employed to rigorously prove the uniform boundedness and stability of the closed-loop system.

Main Results:

  • The proposed control strategy effectively suppresses riser vibrations.
  • The state observer error is demonstrated to converge exponentially to zero.
  • The uniformly bounded stability of the closed-loop system is rigorously established without simplifying dynamics.
  • Simulation studies validate the performance of the control under various conditions.

Conclusions:

  • The developed adaptive boundary control is effective for vibration reduction in flexible marine risers with uncertainties.
  • The integration of observer-based techniques and adaptive laws ensures robust stability and accurate state estimation.
  • This approach offers a promising solution for enhancing the operational reliability of marine riser systems.