Loading...

Modeling and Control a Flexible Large Deformation Beam Actuated by Some SMA Actuators

Zakerzadeh, Mohammad Reza | 2012

840 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 42832 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Sayyaadi, Hassan; Vossoughi, Gholamreza
  7. Abstract:
  8. Smart structures are the combination of structure, smart material, electronics and control technologies. Changing the shape of the structures by smart actuators is one of the most important applications of Shape Memory Alloy (SMA) in these structures. Having used these actuators, we can effortlessly and continuously deform and reshape the structures. Nevertheless, working with SMA actuated smart structures has one obvious drawback that is their hysteretic and nonlinear behavior, making modeling and control of these structures complex. Another difficulty in the control of smart structures is their great sensitivity to the actuating force that reduces the controllability of these structures. To solve the aforementioned problems, here, the modeling and shape control of the structures actuated by SMA wire actuators is investigated. In this thesis, the initial prediction of the mentioned structures, by performing an analytical modeling, is first made and a test set-up is, then, built. Due to the ineffectiveness of the model in the control process, the phenomenological hysteresis models are compared and contrasted that resulted in selecting the Prandtl-Ishlinskii hysteresis model in predicting SMA actuated structures for modeling and control processes. In addition, during the recent years, the Prandtl-Ishlinskii model, due to its analytical invertible property, has been widely used in the control process of smart materials. This model, parallel with a simple feedback controller, can lead into more accurate results in tracking control. Also, to control the temperature of SMA actuators, an adaptive controller was used to make it robust against ambient disturbances. Finally, implementing the control system in structures with two active SMA actuators can yield great results not only in controlling the shape of the structure, but also in large deformation mode.
  9. Keywords:
  10. Smart Structures ; Shape Memory Alloy ; Control ; Large Deformation ; Hysteresis Modeling

 Digital Object List

 Bookmark