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Probabilistic Seismic Demand Analysis Using Endurance Time Method
, Ph.D. Dissertation Sharif University of Technology ; Esmail Pourestekanchi, Homayoon (Supervisor)
Abstract
In the field of estimating the expected performance of structures under the excitation of earthquakes of different magnitudes, the Endurance time method has been introduced as a fast method in recent years. What is needed now in this method is to study the assumptions and definitions used in this method, to choose more logical definitions, to unify them, and to prove the statistics of this method in the overlapping and generalizable range of different structures. For this purpose, in this dissertation, different definitions have been evaluated in the process of using the Endurance time method and IDA. The results of different definitions for the target time equivalent to each earthquake...
Design and Development of a Propeller Blades in order to Produce Lift and Thrust Simultaneously Inspired by the Maple Seed Aerodynamics
, M.Sc. Thesis Sharif University of Technology ; Javadi, Khodayar (Supervisor)
Abstract
Drawing inspiration from natural phenomena can provide simple solutions for creating new inventions. The graceful spinning and aerodynamic properties of maple leaves motivated a study on their rotation mechanics and physics, ultimately leading to the design of a propeller blade inspired by their shape and properties. Given that each maple tree produces thousands of leaves varying in dimensions, an average shape was calculated using digitizer software and Excel. Due to the small size of the leaves, one leaf was selected for 3D scanning. From various sections of the scanned leaf, airfoils were extracted and propellers were designed using SolidWorks software. Observing that these leaves...