Loading...

An Investigation of the Effects of Structural Nonlinearity on the Performance of Active and Passive Control Systems

Khansefid, Ali | 2013

696 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44724 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadizadeh, Mehdi
  7. Abstract:
  8. This study is an investigation of the effects of structural nonlinearities on the performance of different structural vibration control systems, including active control using LQR algorithm and passive control using viscous fluid dampers and hysteretic dampers. By designing the control systems for linear structurs and comparing their performances in nonlinear response range, the abilities of these control systems to handle structural nonlinearities are compared. In other words, the dependency of these control systems on the properties of the structure (which may be altered by nonlinearities or uncertainties in estimations) is assessed. It is demonstrated that as a general trend, the ability of control devices to improve the structural response decreases as the controlled structure enters its nonlinear response range. Further, it is shown that among all control systems studied herein, viscous dampers are affected the least by the alteration of structural properties through nonlinearities. As a result, the superiority of active control systems above passive viscous fluid dampers is somewhat mitigated. In addition, it is shown that the severity of earthquake excitation along with the choice of the performance index significantly affect the determination of the best-performing system, and despite the usual expectations, active control systems do not always result in the best structural response
  9. Keywords:
  10. Active Control ; Passive Control ; Viscous Damper ; Hysteresis Damper ; Structural Nonlinearity ; Performance Index

 Digital Object List

 Bookmark

No TOC