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Design of Tensegrity Structure as Supporting Structure of Mesh-Like Deployable Antenna for use in Micro-Satellites

Talebi, Behnam | 2008

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39431 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Abedian, Ali
  7. Abstract:
  8. Deployable structures have been used on small satellites since the beginning of such space programmes. Here, the design sequence for a special tensegrity structure, for use as supporting structure for deployable mesh-like antenna will be proposed. The design process is conducted to prevent structural elements from failure, and satisfy the minimum specified natural frequency. In this research, structural modeling is performed based on two external geometric parameters (overall height and diameter), and three internal geometric parameters (elements cross-section properties). The pre-stress in structural element is the last design parameter. Also, materials are pre-assigned. Internal forces of elements are not independent of each other; so with assuming one of them it is possible to calculate others analytically using static analysis. Therefore, it is possible to design elements independently based on an initial guess. Having these, it will be possible to evaluate model natural frequency using numerical modal analysis. With using this process, it is possible to find relationship between initial guesses, mass and natural frequency of final model. With omitting the initial guess from two obtained design graphs, an important design graph, which explains relationship between models weight and natural frequency, will be obtained. This graph can be useful for satellite designers for deciding about this kind of antennas
  9. Keywords:
  10. Vibrational Analysis ; Design ; Microsatellite ; Tensegrity Structure ; Mesh-Like Antenna

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