欠驱动航天器滑模速率阻尼控制

针对具有推力器执行机构的航天器，在一轴推力器失效的情况下，设计滑模变结构速率阻尼控制器，证明系统的稳定性;分析控制器的抗干扰能力，给出控制器参数选取的指导原则;通过将惯量积视为外界干扰的方法，解决了非对角惯量阵航天器的欠驱动控制设计问题.从工程实际情况出发，考虑了推力器的开关工作特性、角速度测量幅值受限、外界干扰和非对角惯量阵的影响.最后通过数学仿真验证了控制器的有效性和工程实用性.

Sliding Mode Control for Rate Damping of Underactuated Spacecraft

A sliding mode rate damping controller is designed for underactuated spacecraft with one of the three axes actuators invalid. The stabilization problem of the system is addressed, and the disturbance rejection performance is analyzed. The guideline of tuning parameters for the controller is presented. By regarding product of inertia as external disturbance, the problem of designing a controller for underactuated spacecraft with non-diagonal inertia matrix is resolved. The application aspects are considered, such as the switching feature of thrusters, the saturation characteristics of rate gyroscope, the existence of external disturbance and the non-diagonal property of the inertia matrix. Numerical simulation results demonstrate the effectiveness and practicability of the designed controller.