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Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
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Robust adaptive vibration control of a flexible structure.

A M Khoshnood1, H M Moradi1

  • 1Aerospace Engineering Department, P.O. Box 16765-3381, K.N. Toosi University of Technology, Tehran, Iran.

ISA Transactions
|April 8, 2014
PubMed
Summary

This study introduces a robust adaptive control system for flexible launch vehicles (FLVs) to suppress vibrations. The L1 adaptive control method effectively reduces vibration effects without compromising system stability or phase margin.

Keywords:
Flexible structureL1 small gain theoremModel reference adaptive systemRobust adaptive controlVibration control

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Area of Science:

  • Control Systems Engineering
  • Aerospace Engineering
  • Vibration Analysis

Background:

  • Adaptive control systems are crucial for high-performance controllers.
  • Robust theories enhance adaptive control approaches.
  • Flexible launch vehicles (FLVs) require effective vibration suppression.

Purpose of the Study:

  • To propose a practical control system for vibration suppression in FLVs.
  • To utilize a model reference adaptive control scheme with robust theories.
  • To adaptively construct control inputs by estimating vibration frequencies.

Main Methods:

  • A model reference adaptive control scheme incorporating robust theories.
  • Shaping control input from the FLV's dynamic model.
  • Estimating undesirable vibration frequencies for adaptive control.
  • Ensuring robust stability using the L1 small gain theorem.

Main Results:

  • The proposed control system significantly reduces vibration effects on FLV performance.
  • Adaptive construction of control input components based on frequency estimation.
  • Robust stability of the adaptive vibration control system is guaranteed.
  • No loss of system phase margin observed during simulations.

Conclusions:

  • The robust adaptive vibration control strategy is effective for FLVs.
  • The L1 adaptive control approach provides high-performance vibration suppression.
  • The method ensures system stability and maintains phase margin, crucial for aerospace applications.