Drag-free control is one of the key technologies for the verification of Taiji-1 satellite. In the direction of sensitive axis, the drag-free controller receives the measurement signal from the high-precision gravitational reference sensor on the satellite, and instructs the micro-thruster system to counteract the disturbance force acting on the sensitive axis, so that the microgravity level in the sensing axis direction of the satellite can reach the order of 10−9 m/s² in the measurement band. In order to fully verify the drag-free control system, a ground one-dimensional drag-free semi-physical simulation system is built to simulate the performance of various payloads in the drag-free control loop, and to verify the performance and technical targets that the drag-free control system can achieve in the ground control loop. Through the small angle approximation, the equivalent relationship between the rotation of the experimental model and the translational motion of the experimental satellite in the direction of drag-free is demonstrated. In the condition of neglecting the stiffness and damping of the suspended pendulum, the parameters of the suspended pendulum are designed according to the principle of equal acceleration, and their effectiveness is verified by numerical simulation. According to the operation mode of on orbit drag-free control, the ground drag-free experimental scheme and drag-free controller are designed, and the experimental research and verification are carried out. The results show that the controller can effectively control the displacement and acceleration of the experimental model, and also can effectively suppress the disturbance of certain amplitude and frequency.

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一维无阻力控制的地面半实物仿真实验研究

无阻力控制是太极一号卫星验证的关键技术之一。在敏感轴方向，无阻力控制器接收来自卫星上高精度重力参考传感器的测量信号，并指示微推力系统抵消作用在敏感轴上的扰动力，使微重力卫星感测轴方向电平可达10级-9米/秒²在测量范围内。为全面验证无阻力控制系统，搭建地面一维无阻力半实物仿真系统，模拟无阻力控制回路中各种有效载荷的性能，并验证其性能和技术指标。无阻力控制系统可以在地面控制回路中实现。通过小角度近似，证明了实验模型的旋转与实验卫星在无阻力方向的平移运动之间的等效关系。在忽略悬摆刚度和阻尼的情况下，根据等加速度原理设计悬摆参数，并通过数值模拟验证其有效性。根据在轨无阻力控制运行模式，设计了地面无阻力试验方案和无阻力控制器，并进行了试验研究和验证。结果表明，该控制器能有效地控制实验模型的位移和加速度，并能有效抑制一定幅度和频率的扰动。