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Chen X.,Anhui Press and Publication Vocational College | Zhang C.,Anhui Press and Publication Vocational College
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2012

The characteristics and Bode diagrams analysis indicated that there was a highly complementarity between the PID control and the piezoelectric ceramic (PZT) micro-actuators in the positioning control process of DC motor. Taking advantage of this complementarity, we can build up the composite positioning control (CPC) system. The CPC system has been modeled and simulated by using the Matlab software. The dynamic response curve showed that, while loaded by step and continuous reference displacement signals, the system would automatically switch between the PID control and the PZT control, complete dynamic tracking to target objects, according to the magnitude of the reference signal and the requirement of the positioning accuracy. This behavior brings it a more prompt and precise result in positioning process than any of the single positioning controllers. Source


Chen X.,Shihezi University | Li W.,Shihezi University | Gong L.,Shihezi University | Chen X.,Anhui Press and Publication Vocational College
International Journal of Control and Automation | Year: 2015

During the design process of the DC motor composite positioning control system (CPCS), in order to solve the contradiction between the positioning accuracy and the stability, we introduce the equioscillation and equiprecision lines in the root locus plane, analyze and compare root locus maps, the frequency characteristics, and the dynamic responses for PID and CPCS on MATLAB. The results show: within the high-order control system root locus configuration boundary, there always exist three specific boundaried subspaces. Under the condition of simplifying the transferring function to fifth-order from using zero, poles cancellation method, the subspaces' controllability and observability are not changed. The determination of status feedback matrix K and estimator gain L for the high-order control system can be transformed to solving the third-order dynamic equations for specific boundary conditions, and by constructing the dynamic regulator or compensator achieve zero-pole optimal configuration. © 2015 SERSC. Source


Chen X.-D.,Anhui Press and Publication Vocational College | Cheng F.,Anhui Press and Publication Vocational College | Feng P.,Anhui Press and Publication Vocational College
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2014

Root locus maps, the frequency characteristics, and the dynamic response curves were analyzed and compared for composite positioning control system (CPCS) and PID systems on MATLAB in order to solve the contradiction between the positioning accuracy and the stability during the design process of the DC motor CPCS. Results show that the high-order control system transferring function can be simplified as the basic five order form of a real zero, a real pole, and two pairs of complex conjugate poles by using reduced-order method. Further analysis of the zero and pole's impact on system dynamic performance indicates that the positioning accuracy can be improved by changing the dominant pole damping ratio and handover frequency value. The process will inevitably lead to reduced system stability and can cause velocity oscillation. The oscillation can only be suppressed or eliminated by regulating the non-dominant complex conjugate poles B. Source


Zhou Y.-S.,Anhui Press and Publication Vocational College | Chen X.-D.,Anhui Press and Publication Vocational College | Cheng F.,Anhui Press and Publication Vocational College | Feng P.,Anhui Press and Publication Vocational College
Chinese Journal of Engineering Design | Year: 2015

Aiming at the problem of model uncertainty caused by the change of external disturbance, DC motor conditions and the modeling error, robust DC servo motor speed control system was designed using μ control theory. Firstly, by introducing fictive uncertainty, the robust performance problem was transformed into robust stability problem of augmented system. Secondly, the DC servo motor speed control system design was constructed into the general framework of μ synthesis according to the principle of interference suppression,and weighting functions was selected properly to get the augmented controlled object. Lastly, the D-K iteration algorithm was used to solve the seventeen-order controller, and this controller was reduced to fourth-order successfully using the Hankel singular values and dominant-pole procedure. Robustness analysis was performed in term of the controller,results showed that the reduced-order μ controller yielded the desired robust stability as well as the robust performance. Source

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