Papers by Keyword: Parallel Control

Abstract: A biped robot based its mobility imitating human movements; this development is focused on the movement of the lower limbs. The mobility of the robot is made by servomotors; because they work in a very similar way as the joints of the human’s lower limbs but with some restrictions. The logic of this system was coded on VHDL language to be implemented in a FPGA. The reason for using this hardware; is because it had fast reaction speed, its implementation is friendly and versatile also is able to handle multiple processes in parallel. This paper describes the servo characteristics and how it was used to through an FPGA make possible move a robot who imitates the human movements in the sagittal plane, also show the mechanical design. Shows that the FPGA is better suited in this case than a micro controller to follow multiple paths at the same time.

Abstract: This paper is intended to design a parallel 50v/2A converter. The paper begins with the respective detailed working principles of PWM current control mode and voltage control mode, as well as their differences. By introducing the PWM IC UC3846 for current mode control, in order to meet the demand of duplex output, a full-bridge circuit is designed based on double chip PWM control, and the control circuit and the main circuit are explained in detail. The paper concludes with the proposal of a prototype that meets the expected experimental results.

Abstract: The goal of workflow system is to guarantee that the right activities are executed and completed within the correct and ideal time periods via automation, moreover, in order to help a company to be sufficiently competitive, the workflow system it adopts should be able to ensure activities are carried out to the maximum extent as possible and to manage several workflow instances at the same time. Hence, sufficient consideration of temporal constraints and efficiency should be taken into the design process of workflow system. This paper proposes a model of workflow control based on time axis which is able to ensure one or more workflows to advance in correct time period efficiently and precisely.

Abstract: Vibration excitation of the machine structures caused by high speed drives often leads to production inaccuracies. By coupling two opposed driving and corporate acting linear drives in one drive train the static and dynamic properties can be improved. This arrangement offers the possibility to distribute the forces between both drives. Furthermore the impulse and jerk feedback into the machine structure can be minimized. In addition de-and acceleration energy can be saved in the coupling element. In order to guarantee the requirement for high accuracy in synchronous tracking as well as to realize pretension of both drives for high acceleration, control strategies and controller tuning methods are going to be discussed based on simulation results.

Abstract: To achieve the assembly process control of aerospace complex precision mechanical systems and ensure its dynamic characteristics, parallel control theory and methodology is used in the assembly process. The main point is: assembly parallel control system is built corresponding to the actual assembly ones. The ultimate quality of assembly is guaranteed via alignment influence analysis on the dynamics characteristics of the assembly joint structural and the assembly machine and the dynamic characteristics-oriented alignment process optimization and decision-making to carry out computing operator and process decision-making in the assembly process. The dissertation ,regarding space sophisticated mechanical system assembly and its dynamic characteristics as study object, introduced the parallel control thought, presented the overall framework of assembly parallel control, built the assembly parallel control system(APCS) and given the main process and implement of assembly parallel control.

Abstract: Aiming at wide variations in loads and moments of inertia, large disturbed moment of machine tool servo system, a parallel control structure is proposed, and sliding mode structure controller and PI Ziegler-Nichols controller of the position loop are designed. The sliding mode controller can restrain effects of parameter uncertainties and external disturbances and the PI Ziegler-Nichols can realize the parameter adjustments of the integral and proportion of the classical PI controller. Simulation results show that the designed parallel controller can guarantee high performance of tracking behavior and robustness.

Abstract: This paper presents a parallel control method for the structural dynamic topology optimization problem. The necessary and feasibility of parallel control during the optimization iteration process were discussed, respectively. The parallel control algorithm based on traditional sequential programming method was constructed by introducing MMA. The method proposed in this paper can improve the drawback of low computational efficiency and local convergence in FEA, which has been illustrated in the results discussion section in the end of the paper.

Abstract: In order to improve the generated energy of PV array and adding the utilization ration of solar energy, the photovoltaic tracking system adapts electro-optical tracking techniques which making the solar panels always perpendicular to sunlight. This paper mainly introduces the basic structure of photovoltaic automatic tracking system and the control strategy of the stepper motor. The theories of cerebellum model articulation controller and conventional PID control are also described. And combined with the characteristics of PID control, the compound control based on the cerebellum model articulation controller and conventional PID was applied to photovoltaic automatic tracking system and compared with fuzzy PID control algorithm. The simulation result shows that the cerebellum model articulation controller and conventional PID parallel control algorithm has the advantage of small overshoot, high robustness, fast response, high control accuracy, and so on.

Abstract: Pointing on nonlinear and parameters vary with time in the velocity servo system, and the requirement of servo system is difficult to meet by the traditional PID control scheme. A control scheme of ANN-based PID controller is developed here for velocity tracking control for an electro-hydraulic velocity servo system. In this paper the mathematical model is established for the system, and the PID controller based on cerebellar model articulation controller (CMAC) are designed and connected in parallel. Numerical simulation results indicate that the proposed control scheme has an excellent performance on high precision velocity tracking ability and rejection of disturbance, comparing with conventional PID control strategy.

Abstract: To improve the effectiveness of management measure for the information security, the parallel control approach is employed to the optimization of information security management measure. The simulation software Extend is applied to build the artificial system of information security management system, and the information security management measure is evaluated via the artificial system. A parallel control system is applied to achieve the interaction between the true system and the artificial system to minimize their difference. The computational experiment method is used to continuously adjust the information security management measure, and obtains the satisfied information security management measure finally. Take the public Internet network management as example to illustrate this method can achieve the real-time simulation, evaluation and optimization of information security management measure.