With the development of ultra-high-density optical storage technology, the density of storage media is getting higher and higher, but the increase of the capacity of the optical disk leads to the reduce of the lens-disk interface gap and the tolerance of the focus error dramatically. In the case of extremely small spacing, various external disturbances are highly likely to cause a collision between the optical lens and the disc. In order to avoid the collision between the optical lens and disk, effectively eliminate the deterministic disturbance and suppress the unknown random disturbance, in this paper a multi-objective optimal output feedback controller design approach is proposed within the Q (Youla)-parameterized regulator scheme. The optimal Q parameter in the controller is obtained by solving the properly formulated linear matrix inequalities (LMIs). The experimental results show that the designed Q-parameterized controller can eliminate the influence of various disturbances and suppress the occurrence of collisions effectively.

随着超高密度光存储技术的发展，存储介质的密度越来越高，但是光盘容量的增加导致镜头-光盘接口间隙的减小和光盘的公差。聚焦误差显着。在极小的间距的情况下，各种外部干扰很可能引起光学透镜和光盘之间的碰撞。为了避免光学透镜和光盘之间的碰撞，有效消除确定性干扰并抑制未知的随机干扰，本文提出了一种在Q（Youla）参数化调节器方案内的多目标最优输出反馈控制器设计方法。。最佳Q控制器中的参数是通过求解适当公式化的线性矩阵不等式（LMI）获得的。实验结果表明，所设计的Q参数控制器能够消除各种干扰的影响，有效地抑制了碰撞的发生。