Browsing by Author "Badawy, A"

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    High Accuracy Spacecraft Orbit Propagator Validation
    (AMME, 2018-04) Refaat, A.; Badawy, A; Ashry, M; Omar, Adel
    The Space Situational Awareness (SSA) problem is becoming an exponentially significant concern for satellite operators. The threat of on-orbit collisions endangers satellites, spacecrafts and astronauts themselves especially in low-earth orbits (LEO). Many collisions occurred between satellites and debris that include natural, operational and non-operational objects in space. The collision between Russian cosmos 2251 and American iridium 33, for instance, imposed the need for an accurate orbital propagation module. In order to perform successful collision avoidance maneuvers, the mission operators need the orbit prediction to be highly accurate. Simple impractical number of collision avoidance maneuvers represents dreadful solution to escape of collision. Fake warning means waste of fuel and resources of satellite. This paper introduces an enhanced model to increase the accuracy of propagation estimation based on a precise perturbation model.
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    Passive vibration attenuation: A comparison study
    (IOP Publishing Ltd, 11/17/2020) Abdelghany, A.A; Hegazy, M.M; Badawy, A
    A comparison study between two different approaches for passive vibration attenuation of solar array had been presented. A powerful finite element software “Ansys” was used to perform this study. Finite element models of a cantilever rectangular aluminum plate are created in order to model the satellite solar array. Stiffeners and circular patches (passive masses) are used separately in order to attenuate the vibration of the plate. The output results of the mode shapes and the FRF of the plate are investigated in order to figure out the best and adequate vibration attenuation technique for satellite solar array, the results showed that using stiffeners have a better effect on vibration attenuation more than using circular patches. A further investigation for vibration attenuation using stiffener is conducted to study the effect of changing the aspect ratio of stiffener.