Papers by Keyword: Servo Control

Abstract: Blanking noise and blanking vibration are causes of pollution. At the same time, blanking vibration disturbs the high precision of a press work product, and shortens the life expectancy of the press machine and the press die. Recently, the use of a servo press has been developed to improve these problems, using low speed blanking and pulse vibration banking. However, these methods lengthen the blanking time, so it is necessary to control the servo press properly in the case of blanking. In this study, we describe a principle for the reduction of blanking vibration when using a servo press, and we propose an active vibration control method for the reduction of blanking vibration. We used a crank servo press of 450kN in an experiment, which has a pulse motion of 10Hz. We conducted a simulation and an experiment of blanking using an active vibration control method, which we named “counter pulse blanking.” We confirmed that counter pulse blanking is effective in reducing vibration as a result of the simulation and the experiment.

Abstract: The paper points out a minimum variance based performance index for restricted controller structure, known in literature and applied in process industries. The theory is introduced briefly. As core of the paper adaption to the topic of speed control for electromechanical drives is shown. Simulational and experimental results for various single and dual-mass systems show good sensitivity to relevant parameters. As main drawback, the index prefers tough controller settings.

Abstract: Hydraulic generation system on helicopter generally consists of flight control hydraulic actuating circuit, landing gear retraction/extension hydraulic circuit, and wheel brake circuit. This paper studies on a volumetric speed control system applied in helicopter flight control actuating system. The system performance curve, deduced from the modeling, simulation and testing of the tail-actuating system, reveals that this volumetric speed control system meets the requirements of helicopter control system actuating.

Abstract: An intelligent robot system is designed based on MK60DN512 embedded microprocessor, in the process of system design, the laser sensor detection sub system is researched, and microprocessor is used to control the multiple steering for robot walking posture adjustment between the robot joint angles, multi actuator position control is obtained, and humanoid robot adjust posture recognition is realized, according to the recognition results, the posture is adjusted, humanoid robot hardware design is taken, humanoid robot hardware design includes surface monitoring subsystem, space orbit simulation part, etc. The humanoid robot software design of robot is taken, combined with the robot walking track rules, the software structure of intelligent robot is designed, 7 degrees freedom coordinate system and link coordinates are constructed based on D-H theory, robot working space is obtained. The hardware part includes 4 parts: MK60DN512ZVLQ10 servo driven, power board, and main control board. The test results show that the humanoid robot has high control precision, the entire race walking of robot control system is simulated with 3cm/s, and the performance is stable, it shown good application value in the robot design.

Abstract: The method of dual sensors closed-loop control is designed for the flat panel control system base on free pendulum.With this method, the angle of the free pendulum is detected firstly by adopting incremental photoelectric encoder,and then with the free swing angle as the set-point,the real time rotation angle feedback of the flat panel is detected by the angle sensor to form closed-loop control. The test results shows that this method well accomplishes the detection function,and implements high precise control.

Abstract: The servo control methods of 6-DOF motion configuration are researched. Based on analysis for characteristic of the motion configuration, the control strategy and control law used on the motion control system are presented. The controller in velocity tracking loop and location loop are respectively designed by frequency correcting method and normal control method which belongs to classical control theory. Sliding mode variable structure control method is presented for location control law designing, against the super low velocity creep caused by friction disturbance, so that the problem of location control loop low velocity creeping is solved, and a simulating experimentation demonstrate the effectiveness of the proposed approach.

Abstract: -In this paper , performance of fuzzy PD , fuzzy PI , fuzzy PD+I , fuzzy PID controllers are evaluated and compared. This paper also describes the speed control based on Linear Quadratic Regulator (LQR) technique. The comparison is based on their ability of controlling the speed of DC motor, which merely focuses on performance index of the controllers, and also time domain specifications such as rise time, settling time and peak overshoot. The controller is modelled using MATLAB software, the simulation results shows that the fuzzy PID controllers are the best performing candidates in all aspects but it as higher overshoot and IAE in comparison with optimal LQR. The Fuzzy PI controller exhibited null offset but suffers from poor stability and peak overshoot, whereas the fuzzy PD controller has fast rise time, with no overshoots but the IAE is much greater. Thus, the comparative analysis recommends fuzzy PID controller but it is usually associated with complicated rule base and tedious tuning. To circumvent these problems, the proposed LQR controller gives better performance than the other controllers.

Abstract: The servo control methods of motion configuration are researched. Based on analysis for characteristic of the motion configuration, the control strategy and control law used on the motion control system are presented. The controllers are respectively designed by frequency correcting method and normal control method which belongs to classical control theory. Sliding mode variable structure control method is presented for location control law designing, so that the problem of location control loop low velocity creeping is solved, and a simulating experimentation demonstrate the effectiveness of the proposed approach.

Abstract: For large inertia servo system, improving the system response speed and control precision has always been a difficulty. This paper presents an improved auto disturbance rejection control (ADRC) strategy, which has good control performance for this kind of system. Firstly, transition process is arranged for input signal, which can solve the contradiction between overshoot and rapidity, can also increase the regulation range of feedback gain; secondly, linear extended state observer is designed to identify load changes and other fluctuations; then, for the control plant after observation compensation, a nonlinear feedback controller is designed to obtain better control performance and better disturbance rejection capability. The simulation results show that, compared with the traditional PI controller, with the control strategy suggested in this paper the system has rapid response but very little overshoot, and has strong ability to suppress interference. The design of this controller is simple, easy to implement in Engineering, so it may have important reference value for this kind of large inertia system. Keywords: servo control; large inertia; auto disturbance rejection control; torque ripple; low speed

Abstract: In modern industrial processing of the materials, the solution spraying technology is widely used. Spraying a layer of special solution plays an important role to change their physical and chemical properties. Based on single-axis servo control, precision solution spraying system is able to spray a very thin and a uniform layer of solution on the surface of materials as required. The spraying system mechanical structure is mainly composed of these parts: housing, single-axis servo translation stage, push-pull syringe, multifunctional nozzle and other components. The servo translation stage is capable of providing precise control of speed and stroke by using a specialized controller and driver. The system is running stably and smoothly throughout the experiments after the completion of the entire system assembly and it can fully comply with the requirements of customers with excellent sealing performance, feature-rich and human-friendly control interface and compact mechanical structure.