Optimization of Dynamic Properties in Rotating Sandwich Beams with Partial Magnetorheological Core

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Mehrbod, Mehrzad | 2022

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 55551 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Kouchakzadeh, Mohammad Ali
Abstract:
The present study investigates the effect of MR materials on the vibrations of three-layer pretwisted rotating beams. For this purpose, by considering MR material as the core of the rotating beam and using Hamilton's principle, the equations governing the three-layer rotating beam are extracted. After solving the desired equation, we optimize the dynamic behavior of the three-layer beam at different rotational speeds. Using the Genetic Algorithm optimization tool, the desired beam weight will be minimized and maximum damping will be applied to the desired system. The goal is to find the optimum magnetic field strength for maximum damping in the system at any rotational speed, in addition to location the best positions for the MR packs reducing the weight of the beam. The obtained results show that by using magnetorheological materials in the right place along the length of the beam and applying the appropriate magnetic field intensity, the damping of the system can be significantly increased and also the costs can be saved by reducing the weight
Keywords:
Sandwich Beam ; Optimization ; Genetic Algorithm ; Magnetorheological (MR)Fluid ; Smart Materials ; Dynamic Behavior