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Design and Analysis of Solar Tracking System Using Coupled Multi-physics Fields Based on Opto-thermo Electro Mechanical Actuators

Mahmoudpour, Masihollah | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 42871 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Vesaghi, Mohammad Ali; Zabihollah, Abolghasem
  7. Abstract:
  8. Photostrictive type of opto-thermo-electro-mechanical materials, called PbLaZrTi (PLZT), are a recently emerged family of smart materials, that are able to generate strains under illumination of near violet light and attract much attention in a variety of wireless and remote control applicati-ons, including the areas of material science and engineering, micro-electro-mechanical system (MEMS) and Optical MEMS, and smart structures. This research presents an analytical and finite element investigation into ultraviolet photo-induced multi-physics responses of 0-3 polarized PLZT photocantilever and a comparison of the measured bending displacement. The finite element formulation of the transverse deflection for multi-physics analysis of PLZT ceramics by including the photovoltaic and optothermic effects has been discussed. The coupled photo-induced electrical, thermal and mechanical fields are considered in the formulation. The transverse displacements of a 0–3 polarized PLZT photo-cantilever are predicted using the finite element method and compared with the analytical solution for a silicon cantilever beam with a PLZT actuator bonded on the whole top surface of the beam. The effect of temperature is also investigated by considering the thermal field described in PLZT materials and compared with neglecting temperature effect. In the present research photostrictive thin films are analyzed to evaluate their use as actuators in a micro “light source tracking” device, which is designed to function as a result of irradiation, having neither lead wires nor electric circuits. Finally, an experiment is presented to demonstrate the capabilities and performance of coupled multi-physics model for a PVDF bonded on a steel cantilever beam which is compared with PLZT when they are exposed to temperature.
  9. Keywords:
  10. Finite Element Method ; Microelectromechanical Systems (MEMS) ; Piezoelectric Actuator ; Multi Physics Fields ; Photostriction

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