Space Propulsion - IAP/TU Wien
Space Propulsion - IAP/TU Wien
Space Propulsion - IAP/TU Wien
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<strong>Space</strong> <strong>Propulsion</strong><br />
limit cycle without external torque<br />
A limit cycle without external torque swings the spacecraft back and forth between preset<br />
angular limits. When the spacecraft drifts across one of the angular limits Θ L , the attitude-control<br />
system fires a thruster pair for correction. The spacecraft rotation reverses and continues until the<br />
opposite angular limit is reached, at which time the opposite thruster pair is fired. It is important<br />
that the smallest possible impulse be used for the corrections because the impulse must be<br />
removed by the opposite thruster pair.<br />
cont‘d