抗碰振约束的聚焦伺服优化控制器设计与仿真

Design and Simulation of Anti-collision Optimal Controller for Focus Servo Systems

在下一代超高密度光存储聚焦伺服系统中,镜盘间距极小,而光盘翘曲与未知力干扰会对系统产生确定性和随机性的扰动,从而使镜盘发生碰撞。针对有确定性正弦干扰和随机干扰信号的力矩器系统,在抗碰振约束条件下,利用Q(Youla)参数化调节器设计理论构造基于线性矩阵不等式的Q参数多目标优化输出反馈控制器,通过求解线性矩阵不等式的可行解,获得控制器的优化Q参数值,仿真结果表明,所设计的控制器在防止镜盘发生碰撞的前提条件下能有效的跟踪正弦干扰信号,并对随机干扰有较强的抑制作用。

In next generation optical storage focus servo systems, the rotation of the spindle motor could produce disturbances to the focus actuator system due to the skew of the disk and mechanical vibrations, which consequently affects the focus precision and even causes the lens-disk collision. A Q-parameterized multiobjective optimization controller was proposed for the focus servo system. The optimal parameter expressed in the set of Q-parameterized controllers was solved by some properly formulated linear matrix inequalites （LMIs）. Simulation results show that the designed controller has a good capability to deal with both the deterministic sinosodial disturbance and the random unkown disturbance simutaneously under the anti-collision constraint.