Pusat Pengajian Kejuruteraan Aeroangkasa - Monograf

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Wheel momentum dumping using magnetic torquer
(2009-04-01)
Abdul Razak, Mohd Firdaus
The wheel momentum unloading is an important process in the small satellite based on momentum bias. Usually the process is achieved by the magnetic torquers because it’s easily to designed and low cost saving. The main purpose of this thesis is to develop control algorithm for wheel momentum dumping using magnetic torquer. To develop the appropriate control algorithm the dynamic equation of the satellite is defined and need to be linearized. The control algorithm then carried out in the MATLAB and Simulink to observe the wheel momentum unloading performance. The result is compare with the performance of the wheel without the unloading process and it shows that the momentum unloading process give the better performance of the momentum wheel. For the demonstration purposes, the Tiung-Sat satellite has been chosen to simulate the wheel momentum unloading using magnetic torquer for the small momentum bias satellite. The performance of the momentum unloading process exhibits that the angular momentum wheel steady state error is achieved with accuracy value in range of 0 to 0.008 Nms. Thus, the magnetic torquer is a promising option for the small momentum bias satellite.