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Optical disc drive comprising switching gains for forcing phase states to follow a sliding line trajectory in a servo system
Optical disc drive comprising switching gains for forcing phase states to follow a sliding line trajectory in a servo system
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机译:光盘驱动器,包括用于强制相位状态跟随伺服系统中的滑线轨迹的切换增益
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摘要
An optical disc storage system comprises a sliding mode controller for actuating an optical read head assembly over an optical disc during focus capture, focus tracking, track seeking and centerline tracking. The sliding mode controller is a non-linear control system which operates by switching between positive and negative feedback in order to force certain phase states (such as the read head's position error and velocity) to follow a predetermined phase state trajectory. Sliding mode control provides improved compensation to parametric variations, external load disturbances and other transients such as, for example, the focus capture transient. Furthermore, the sliding mode positive and negative feedback gains need only be within a predetermined range, thereby allowing gain values of 2.sup.n which significantly reduces the complexity and cost of the gain multipliers.
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