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en:stabilization [2018/10/12 15:24]
golikov
en:stabilization [2019/07/31 15:34] (current)
golikov
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-===== Why do we need stabilization mode =====+=====Lesson 04===== 
 +==== Why do we need stabilization mode ====
  
 Satellite stabilization mode means maintaining a zero angular velocity. This mode is necessary, for example, to obtain clear images or transfer them to a ground receiving point, when the data transmission time is long and the satellite antenna is not allowed to deviate from the ground receiving point. The theory described in this lesson is also suitable for maintaining any desired angular velocity ​ (not  only zero velocity), and for such tasks as tracking a moving object. ​   ​ Satellite stabilization mode means maintaining a zero angular velocity. This mode is necessary, for example, to obtain clear images or transfer them to a ground receiving point, when the data transmission time is long and the satellite antenna is not allowed to deviate from the ground receiving point. The theory described in this lesson is also suitable for maintaining any desired angular velocity ​ (not  only zero velocity), and for such tasks as tracking a moving object. ​   ​
  
-===== How to implement stabilization mode =====+==== How to implement stabilization mode ====
  
 You can change the satellite’s angular velocity using flywheels, jet engines, electromagnetic coils, and gyrodyne engines. In this example we consider the control over the control moment using the flywheel. The action of this device is based on the Law of conservation of angular momentum. For example, when the flywheel engine spins in one direction, the spacecraft (SC), respectively,​ begins to rotate in the other direction. It happens under the action of the same unwinding moment, but directed in the opposite side in accordance with the Newton'​s Third Law. If, under the influence of external factors, the spacecraft begins to turn in a certain direction, it is enough to increase the rotation speed  of the flywheel in the same direction. So, the unwanted rotation of the spacecraft will stop because the flywheel will "​take"​ the rotational moment instead of the satellite. . The information about the angular velocity of the satellite will be received ​ by use of angular velocity sensor. In this example, we  consider how to calculate control commands for the flywheel from the indications of the angular velocity sensor and data on the speed of the flywheel. It is needed for the satellite to stabilize or maintain the required angular velocity ​ You can change the satellite’s angular velocity using flywheels, jet engines, electromagnetic coils, and gyrodyne engines. In this example we consider the control over the control moment using the flywheel. The action of this device is based on the Law of conservation of angular momentum. For example, when the flywheel engine spins in one direction, the spacecraft (SC), respectively,​ begins to rotate in the other direction. It happens under the action of the same unwinding moment, but directed in the opposite side in accordance with the Newton'​s Third Law. If, under the influence of external factors, the spacecraft begins to turn in a certain direction, it is enough to increase the rotation speed  of the flywheel in the same direction. So, the unwanted rotation of the spacecraft will stop because the flywheel will "​take"​ the rotational moment instead of the satellite. . The information about the angular velocity of the satellite will be received ​ by use of angular velocity sensor. In this example, we  consider how to calculate control commands for the flywheel from the indications of the angular velocity sensor and data on the speed of the flywheel. It is needed for the satellite to stabilize or maintain the required angular velocity ​
en/stabilization.txt · Last modified: 2019/07/31 15:34 by golikov