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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 39068 (45)
- University: Sharif University of Technology
- Department: Aerospace Engineering
- Advisor(s): Malaek, Mohammad Bagher
- Abstract:
- The main goal of this research is to reduce aircraft design cycle period, by reducing the necessary number of design cycle iterations. The Design cycle period is one of the main characteristics of the design process and design cycle iterations play a major role in the design cycle period. To achieve the above mentioned goal, we present a mathematical model of iterations for the aircraft design process. This model describes the design coupled tasks as a discrete-linear time invariant dynamic system. This model also helps identify tasks which are the most important for generating iterations. This new method basically helps break information cycles that create iterations among important tasks. Studies conducted on a General Aviation airplane design process, show the success of the suggested approach. This procedure eventually leads to an expedited convergence rate for the design iterations. That is, through proper breaking of information cycles, the convergence rate of the most dominant design mode could be increased up to 31%. Second case study conducted on the same airplane design process, in order to reduce effect of increasing iteration convergence speed on design quality by use fuzzy logic. This study shows the success of the fuzzy approach. After imply the approach, the convergence rate of the most dominant design mode could be increased up to 30% and 5.7% decrease influence of increased iteration speed on design quality
- Keywords:
- Design Process ; Design Management ; Design Structure Matrix ; Fuzzy Decision Making
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