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Magnetic torquer based satellite attitude control of gravity gradient stabilized satellite /Eric Chieng Ching Hun

Magnetic torquer based satellite attitude control of gravity gradient stabilized satellite_Eric Chieng Ching Hun_A2_2012_NI

Abstract Graviti kesukaran stabil satelit adalah sejenis satelit yang menggunakan hanya kaedah kecerunan graviti stabil untuk menstabilkan sendiri. Ia adalah sejenis sistem kawalan pasif yang menggunakan geometri satelit untuk melaksanakan penstabilan. Walau bagaimanapun, satelit stabil tidak boleh mencapai sepenuhnya penstabilan 3-paksi sebagai salah satu paksi adalah un-stabil. Pelbagai sistem kawalan sikap telah dianggap untuk menstabilkan paksi dengan keadaan satelit itu mengorbit di sekitar Low Earth Orbit (LEO). Torquers magnet menjadi pilihan yang baik kerana kelebihan ia menyediakan. Torquer magnet diletakkan pada 3paksi satelit untuk menyediakan kawalan 3-paksi untuk menstabilkan satelit. Oleh itu, pelbagai model matematik telah dilakukan untuk menganalisis medan geomagnetik, prestasi sikap, ketika dipole magnet dan daya kilas kawalan. Perbandingan antara kecenderungan yang berbeza telah dilakukan untuk mengenal pasti kecenderungan yang menyediakan paling kestabilan kepada satelit. Simulasi dijalankan pada SIMULINK ®, perisian komputer yang menyediakan penyelesaian untuk membina model aliran. ___________________________________________________________________________________ Gravity Gradient Stabilized Satellite is a type of satellite that uses merely gravity gradient stabilized method to stabilize itself. It is a type of passive control system which uses the geometry of satellite to perform stabilization. However, the stabilized satellite cannot achieve fully 3-axis stabilization as one of the axes is un-stabilized. Various attitude control system had been considered to stabilize the axis with condition the satellite is orbiting around Low Earth Orbit (LEO). Magnetic torquers become a good choice because of the advantage it provides. Magnetic torquer is placed on the 3-axis of the satellite to provide 3-axis control to stabilize the satellite. Therefore, various mathematical modelling had been done to analyse the geomagnetic field, attitude performance, magnetic dipole moment and control torque. Comparison between the different inclinations are been done in order to identify the inclination which provide more stability to the satellite. The simulation is run on SIMULINK®, computing software which provides solution for flow model building.

Contributor(s): Eric Chieng Ching Hun - Author Primary Item Type: Final Year Project Language: English Subject Keywords: satellite ; gravity gradient stabilized ; magnetic torquers First presented to the public: 6/1/2012 Original Publication Date: 8/10/2020 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Aerospace Engineering Citation: Extents: Number of Pages - 60 License Grantor / Date Granted:   / ( View License ) Date Deposited 2020-08-10 10:18:57.698 Submitter: Nor Hayati Ismail

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