Papers by Keyword: PID

Abstract: A new generation of crane controllers with higher reliability and controllability is designed compared with present home and abroad crane controllers. Its power unit is isolated from the control unit with optical fibers. It has two layers of power isolation. The voltage value of input signals is raised. The interference resisting capability is raised by replacing transistor circuits with PWM firing technology. There are six control points to control brakes. Besides, the control system reliability and performance are enhanced by superseding mere PID control with combination of PID control and stator current close loop. Tests proved the effectiveness.

Abstract: This paper designs the core structure of fuzzy parameters self-tuning PID controller on the basic of nonlinear tracking-differentiator. Through constantly testing error E and rate of change EC, makes the controlled object have good dynamic and static performance. In order to meet the different requirements of controller parameters in the different constant of E and EC, the system can modify three parameters online in operation, and realizes the comprehensive and simulation process based on VHDL.

Abstract: The building heating energy consumption has drawn peoples attention gradually. Heat transfer station, as the central part of the heating system, has the characteristics of great inertia, pure delay in the temperature control system. Considering these characteristics, the GA-PID arithmetic was presented, and a simulation model was created in this dissertation. Comparing with traditional PID control, GA-PID control system has a half overshoot, shorter adjustment time, higher accuracy, and enters into the steady state faster. The simulation results prove the correctness and effectiveness of the proposed control scheme.

Abstract: The system models for analysis and optimization of an electro-hydraulic proportional synchronous system is presented based on AMESim. This paper studies the control strategy for the improvements of the response time, steady-state accuracy, stability and synchronization of the system. The speed of a hydraulic motor can be controlled through regulation of the PID controller by the genetic algorithm. Simulation results show that performances of the system have been improved and expected results can also have been obtained.

Abstract: This paper focus on the instability of asynchronous motor direct torque control system which caused by PID parameter changes. In order to improve the self-tuning capabilitiy of PID countroller, enhance the speed and stability of control system. fuzzy adaptive method was adapted to optimize PID parameter. Simulation results show that: this strategy improved the performance of direct torque control system significantly.

Abstract: A novel parallel control strategy based on the CMAC controller and PID control is proposed which is to solve the problem of extraneous torque which exists in the load simulator. In which, the CMAC controller realizes feed forward control, yet conventional PID controller only realizes feedback control, and using the PD algorithm improves system. The simulation results show that output of the conventional PID controller completes unceasing on-line learning by the CMAC neural network. Effectively suppress the extra torque of the load simulator, the Load Simulator system performance has been improved significantly.

Abstract: Aiming at a kind of state unpredictability of the fuzzy input large time-delay systems, the author designs a fuzzy observer with the application of Parallel Distributed Compensation (PDC), puts forward the PID control method based on the fuzzy observer, and provides a new sufficient condition which guarantees the asymptotic stability of fuzzy large time-delay system. With the employment of generalized Lyapunov function and linear matrix inequality, this paper proves the asymptotic stability of fuzzy input large time-delay systems and offers the separation design algorithm to control and observe gain matrix. The simulation results of the experiment further verify the effectiveness of the methods and conditions raised in this paper.

Abstract: Before casting, use filtering technology to reduce the impurities and inclusions in the melt. Whether aluminum melt processing is good or not can affect the quality of the products and then, affect the subsequent processing materials product quality. Therefore, aluminum melt filtering technology is an important part of the aluminum production technology. This paper discusses the PLC application in the aluminum melt filtration according to present situation of aluminum production..

Abstract: The mathematical vector model of a permanent magnet synchronous motor (PMSM) has first been discussed in this paper, and a servo control system based on Space Vector Pulse Width Modulation (SVPWM) has been designed, in which a enhanced Microprogrammed Control Unit (EMCU) is combined with drive chips and the relevant control software to achieve the precise control of PMSM. In order to control the position, speed and current of the PMSM, six SVPWM signals are generated with the motor vector control method, and the vector control strategy with three closed loops is projected. According to the control principle, the circuits of the hardware modules are designed and built, and the program of the control process is compiled and downloaded the EMCU, and then the human-computer interaction interface of the system is implemented by LabVIEW. The results of the test show that the control system designed can control the rotating speed and the high-speed pendulum operation of PMSM precisely.

Abstract: This document presents an application of a PID (proportional, integral and derivative) controller designed by the pole placement technique and applied to a Maglev (Magnetic Levitation) train system plant. The linearization with Taylor Series is demonstrated including the development of the formulas to calculate the parameters of the controllers to three operation points and the performance of each controller is tested under disturbances, and switching controllers between the plants for different operating conditions.