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<p align="justify">Control Moment Gyro (CMG) is a type Attitude Control System (ACS), a system used to change the attitude of satellite along its orbit. CMG generates required gyroscopic torque by spinning a number of rotors, and directs the torque by changing the orientation of thos...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/27967 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | <p align="justify">Control Moment Gyro (CMG) is a type Attitude Control System (ACS), a system used to change the attitude of satellite along its orbit. CMG generates required gyroscopic torque by spinning a number of rotors, and directs the torque by changing the orientation of those rotors using gimbals. CMG is capable of generating a large amount of torque with relatively low power which makes it suitable to be used as a satellite ACS. A major problem encountered with the use of CMG in practice is the presence of singularity,a state in which, the CMG is unable to produce torque in a particular direction, and thus causing a loss of control on the satellite. To overcome this problem, various steering algorithms have been developed including Singularity Robust Inverse (SR-I), Null Motion Algorithm, and Off-Diagonal Singularity Robust (o-DSR). <br />
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In this thesis, Simulink based satellite-simulator is developed, which include satellite dynamic model, CMG dynamics model and three steering algorithm, ie., Singularity Robust Inverse (SR-I), Null Motion Algorithm, and Off-Diagonal Singularity Robust (o-DSR). The performance of each steering algorithm will then be tested in term of their capability to overcome singularity problem in pyramid array of 4 CMG. In addition, to represent the real condition of CMG system, the effect of maximum gimbal rate to the performance of each steering algorithm will be studied. The best performing algorithm will then be selected and used in satellite attitude control simulations. <br />
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The results show that the developed simulator is capable of simulating satellite attitude control using CMG. The tests of various algorithms show that weighted o-DSR has the best performance. Furthermore, the simulation results also show that attitude control using CMG is successfully done and weighted o-DSR is able to overcome singularity problem encountered during reorientation maneuver. <p align="justify"> <br />
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