Structural Engineering and Mechanics

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Modal-based mixed vibration control for uncertain piezoelectric flexible structures

  • Xu, Yalan (School of Electronic & Mechanical Engineering, Xidian University) ;
  • Qian, Yu (School of Electronic & Mechanical Engineering, Xidian University) ;
  • Chen, Jianjun (School of Electronic & Mechanical Engineering, Xidian University) ;
  • Song, Gangbing (Department of Mechanical Engineering, University of Houston)
  • Received : 2014.02.24
  • Accepted : 2015.06.20
  • Published : 2015.07.10
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Abstract

H-infinity norm relates to the maximum in the frequency response function and H-infinity control method focuses on the case that the vibration is excited at the fundamental frequency, while 2-norm relates to the output energy of systems with the input of pulses or white noises and 2-norm control method weighs the overall vibration performance of systems. The trade-off between the performance in frequency-domain and that in time-domain may be achieved by integrating two indices in the mixed vibration control method. Based on the linear fractional state space representation in the modal space for a piezoelectric flexible structure with uncertain modal parameters and un-modeled residual high-frequency modes, a mixed dynamic output feedback control design method is proposed to suppress the structural vibration. Using the linear matrix inequality (LMI) technique, the initial populations are generated by the designing of robust control laws with different H-infinity performance indices before the robust 2-norm performance index of the closed-loop system is included in the fitness function of optimization. A flexible beam structure with a piezoelectric sensor and a piezoelectric actuator are used as the subject for numerical studies. Compared with the velocity feedback control method, the numerical simulation results show the effectiveness of the proposed method.

Keywords

References

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