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Vibration Control of Micro-Satellite Shelves Using Shpae Memory Alloy

Hedayati Dezfuli, Farshad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40181 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Abedian, Ali
  7. Abstract:
  8. Dynamic properties such as the natural frequency of a structure have a significant role in the design process. The importance of this consideration is because of resonance. In this case, the amplitude of the vibration is magnified to levels that may lead to a catastrophic event. While the usual design process depends on the collected experiences and statistical data, a developing trend is to implement smart technologies to develop smart structures that are capable of self-monitoring, diagnostics and repair. Smart material components such as shape memory alloys (SMAs) and piezoelectric ceramics are increasingly being used by vibration control practitioners. Shape memory alloys are applied as actuator and damper in several industries. The main goal of this project is designing a smart system for vibration control of satellite shelves. In this case, natural frequencies of composite plates change using Nickel-Titanium (NiTiNOL) shape memory wires, based on classical composite plate theory and finite element method. The governing equations are solved analytically and numerically to show the effect of stress acting in wires due to SMA transformation caused by temperature changes, on the plate’s stiffness and hence its natural frequency. The natural frequencies of composite plate increase by temperature increasing of SMA wires at temperatures above the austenite finish temperature. In order to optimize the control system, the effect of number, size and arrangement of SMA wires for different B.Cs are studied.
  9. Keywords:
  10. Shape Memory Alloy ; Natural Frequency ; Vibration ; Control ; Stiffness Analysis

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