【摘 要】
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Dear editor,rnRecently,considerable attention has been devoted to out-put feedback control and practical tracking of nonlinear sys-tems[1,2].Unfortunately,limitations of sensor techniques can cause sensitivity errors in practical environments.For example,
【机 构】
：
Institute of Automation,Qufu Normal University,Qufu 273165,China;School of Mechanical Engineering,Ha
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Dear editor,rnRecently,considerable attention has been devoted to out-put feedback control and practical tracking of nonlinear sys-tems[1,2].Unfortunately,limitations of sensor techniques can cause sensitivity errors in practical environments.For example,Ref.[3]showed that the displacement sensor of a magnetic bearing suspension system experienced ±10％sensitivity error in practice.Thus,investigating nonlinear systems with unknown measurement sensitivity is valuable.
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