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The adaptive control using BP neural networks for a nonlinear servo-motor

控制理论与应用（英文版） 2008年第3期6卷 273-276页

作者： Xinliang ZHANG Yonghong TAN Department of Automation School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200030 China College of Mechanical and Electronic Engineering Shanghai Normal University Shanghai 201814 China

The servo-motor possesses a strongly nonlinear property due to the effect of the stimulating input voltage, load-torque and environmental operating conditions. So it is rather difficult to derive a traditional mathematical model which is capable of expressing both its dynamics and steady-state characteristics. A neural network-based adaptive control strategy is proposed in this paper. In this method, two neural networks have been adopted for system identification （NNI） and control （NNC）, respectively. Then, the commonly-used specialized learning has been modified, by taking the NNI output as the approximation output of the servo-motor during the weights training to get sensitivity information. Moreover, the rule for choosing the learning rate is given on the basis of the analysis of Lyapunov stability. Finally, an example of applying the proposed control strategy on a servo-motor is presented to show its effectiveness.

关键词： servo-motor Nonlinearity Neural networks based control Lyapunov stability Learning rate

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Blank Holder Force Control System Driven by servo-motor

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Intelligent Control and Automation 2011年第4期2卷 450-455页

作者： Siji Qin Li Yang Bing Yang 不详

Blank holder force (BHF) control is used to prevent wrinkles of sheet metal in deep drawing process. Based on a novel conception of BHF control technique driven by servo-motor, a new BHF device with six-bar linkage mechanism has been designed and manufactured. Whole control system of the new BHF technique was developed, and the basic structure of the hardware configuration of the system was given. Software analysis, implementation and division of the functional modules have been done. Also, the control software in data acquisition and processing module has been developed in the relevant technology of the BHF control system for the requirements of real-time, stability and accuracy. By the new BHF device combined with the hardware and the software system, the BHF can be regulated accurately variation with the predefined BHF profile in deep drawing process.

关键词： Metal Forming Blank Holder Force BHF Control Driven by servo-motor Six-Bar Linkages

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