Abstract:
A reaction wheel momentum distribution method is provided, which improves the attitude control mobility of satellite by calculating the zero torque of wheel through the simple calculation. The current speed and momentum of wheel are measured in real time. The measured current speed and the momentum are compared with the top speed and momentum set in advance. According to the current speed, momentum and top speed, and the difference of the momentum, the zero torque is calculated. The wheel torque required for the attitude control and stability of satellite is added to the zero torque. By using the input torque of the wheel, the wheel is made in the optimum bias momentum state.
Abstract:
PURPOSE: An inspection device for a three-axis posture control is provided to preciously perform a three-axis posture control inspection by providing an inspection circumstance similar to a cosmic environment and to preciously analyze performance of a satellite in the actual cosmic environment. CONSTITUTION: An inspection device for a three-axis posture control comprises a support unit(110), a ball bearing unit(120) for supporting, a ball bearing unit(130) for rotation, and a mounting unit(140). The support unit is formed at a constant height. The ball bearing unit for supporting is fixed on the top of the supporting unit and formed into a cylindrical shape in which an opening is formed on the top and a ball bearing unit is formed along the inner circumference of the opening. The bottom of the ball bearing unit is inserted into the opening, thereby being seated in the ball bearing unit. The ball bearing unit for rotation is supported to be rotated by the ball bearing unit. An inspection object for a three-axis posture control test is placed on the mounting unit.
Abstract:
본 발명은 선박의 동요를 억제하는 선박 안정화장치에 관한 것으로, 저렴하며, 부피가 작으면서도 운항 및 정지 중에 우수한 감요 성능을 제공할 수 있는 자이로스코프를 적용한 선박 안정화장치에 관한 것이다. 이를 위한 본 발명의 선박 안정화장치는, 선박의 좌우방향으로 이어진 축을 피치축, 선박의 전후방향으로 이어진 축을 롤축, 선박의 상하 방향으로 이어진 축을 요축으로 각각 정의할 때, 선박의 선체에 고정되는 베이스블록과, 상기 베이스블록에 고정되며 선박의 피치축을 중심으로 회전하는 짐벌축을 구비한 짐벌모터와, 요축을 중심으로 회전하는 스핀축을 구비하며 상기 짐벌모터의 짐벌축에 결합되어 피치축을 중심으로 회전하는 스핀모터와, 상기 스핀축에 결합되어 스핀모터에 의해 요축을 중심으로 회전하여 모멘트를 발생시키는 휠을 포함하여 구성되어, 선박의 롤축을 중심으로 한 동요를 억제하는 롤축 제진용 자이로스코프와; 상기 롤축 제진용 자이로스코프의 작동을 제어하는 제어기를 포함하는 것을 특징으로 한다. 선박, 자이로스코프, 안정기, 스태빌라이저, 안정화장치
Abstract:
PURPOSE: A maneuverability and controllability improvement method is provided to improve the attitude maneuver performance of a satellite by simultaneously applying a reaction wheel-based and thruster-based attitude controller when a part of the reaction wheel is out of order. CONSTITUTION: A thruster-based attitude controller(110) controls the drive of the thruster loaded in a satellite. A reaction wheel-based attitude controller(120) controls the drive of the reaction wheel of a satellite. A satellite dynamic mechanics model(130) diversifies the attitude of a satellite. In a satellite, a plurality of reaction wheels are included. A reaction wheel speed controller(121) produces a reaction wheel torque by using an input value from the reaction wheel-based attitude controller. A reaction wheel model(122) produces the angular momentum and the second torque of a reaction wheel by using inputted reaction wheel torque. A summer(103) sums a first torque calculating from a thruster model and a second torque calculating from the reaction wheel model.
Abstract:
본 발명은 인공위성의 위성체 자세기동 시 사용하는 구동기 중 반작용휠과 추력기를 동시에 사용함으로써 기동성능 및 가제어성을 향상시키는 방법에 관한 것이다. 위성체 자세제어 시스템은, 위성체에 탑재된 추력기의 구동을 제어하는 추력기 기반 자세제어기(Thruster-Based Attitude Controller), 상기 위성체의 반작용휠의 구동을 제어하는 반작용휠 기반 자세제어기(Reaction Wheel-Based Attitude Controller) 및 상기 위성체의 자세를 변화시키는 위성체 동역학 모델(Spacecraft Dynamics)을 포함하여 구성된다. 여기서, 상기 위성체에는 상기 복수개의 반작용휠이 구비되고, 상기 반작용휠 중 일부의 고장으로 인한 결손 시 상기 추력기 기반 자세제어기와 상기 반작용휠 기반 자세제어기를 동시에 적용함으로써 위성체의 자세기동을 보정하게 된다. 인공위성 자세제어, 반작용휠(Reaction Wheel), 추력기(Thruster), 반작용휠 고장
Abstract:
PURPOSE: A posture angle sensor three dimensional misalignment correcting method using a monoscopic image is provided to implement the three dimensional misalignment calculation by using a single image information photographed by a camera. CONSTITUTION: A ground control point reference vector is calculated(S100). A ground control point observation vector is calculated by using the image information(S200). A posture error matrix is calculated by using the ground control point reference vector and the ground control point observation vector(S300). A posture angle sensor misalignment correction is implemented by using the posture error matrix calculation value(S400).
Abstract:
A moment gyro cluster for three axis attitude control of an artificial satellite is provided to improve torque performance by using an MPP(Moore-Penrose Pseudoinverse) driving law. A moment gyro cluster is mounted with a predetermined rotation angle(sigma) between 0° and 360°. Sequential torque inputs are applied as much as rotation amounts of an artificial satellite along an axis direction using a new pyramid shape which the moment gyro cluster is mounted with the predetermined rotation angle. Torque inputs corresponding to x, y, and z axes are sequentially applied in accordance with an artificial satellite attitude movement range in respective axes such that an artificial satellite attitude movement is performed.