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In this paper, a novel X-Y parallel piezoelectric-actuator driven nanopositioner is studied from the perspectives of design optimization, dynamical modeling, as well as controller design for high precision positioning. FEM (Finite Element Method) and dynamical modeling are provided to analyze the mechatronic structure of the proposed two-dimensional nano-stage, where the system model including hysteresis...
Due to the existence of various sources of delays, the dynamical model of HDD (Hard Disk Drive) servo systems is actually infinite dimensional, although most of the control algorithms simplified the model with Padé expansions or other finite dimensional approximations. In this paper, a robust loop shaping algorithm is developed for the HDD model with delays by using an ℋ∞ synthesis approach for infinite...
To improve the dynamic response, regulation precision and robustness of the closed-loop system, a novel adaptive pattern recognition based PID (PR-PID) control policy was proposed for industrial processes by combining the adaptive control, pattern recognition and PID control technique. The proposed method can achieve better performance by identifying the output of the system on line with different...
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