Advanced Materials Research Vols. 706-708

Abstract: This system based on single chip PWM dimming technology, with LED lamp as light source, STC89C52 be used as the core of the host device. The PWM control technique be used to realize the energy saving of LED lamp, on-off, brightness and so on. The circuit structure is simple, low cost, easy to operate, can be widely applied in real life.

Abstract: Based on the characteristics of the three types of data from the system of WAMS (Wide Area Measurement System), SCADA (Supervisory Control And Data Acquisition) and Fault-recorder, this paper present an algorithm to do the voltage or reactive power optimization based on the primal-dual interior point method, and a new method to filter out the noise in state variable based on the standardized residuals. The flow chart proposes a new scheme to use the WAMS real-time data to improve the accuracy of voltage and reactive power control. Keywords: WAMS, voltage and reactive power control, primal-dual interior point method, standardized residuals.

Abstract: Actuator, as the execution of the terminal unit of the control system is directly related to the safe and reliable operation of the production process, and once actuators in the system malfunction, will bring huge losses. The research on pneumatic actuator not only devote to the study of its structure, but also need to study the basic theory of the actuator system modeling, and Laid a foundation for the study of the actuator fault diagnosis. Firstly, this paper introduces the components and working principle of the pneumatic actuators which mainly include three parts: pneumatic servomotor, positioner, and control valve. Secondly, the DABlib modules of MATLAB/Simulink as the simulation model of actuator failure are introduced. Finally, we analyzed the common faults of the pneumatic servomotor, positioner, and control valve, and in the MATLAB/Simulink environment, the faults are simulated, and describes the phenomenon of two typical fault.

Abstract: In this paper, a new force and force location sensor based on the principle of gas pellicle loading and pressure differentials enlargement is designed, and the structure, the principle and the analysis of flow field studied by simulation software are also introduced respectively. The sensor is widely used in solving the problem of snatching at flexible or crisp workpiece and analyzing the force position and the accurate force.

Abstract: Acceleration sensor with magnetic fluid is a novel application of buoyancy principle of magnetic fluid. The model of the sensor was established in the paper. To improve the design of the acceleration sensor with magnetic fluid, motion equation of the sensor was deduced, which is the second-order vibration equation. From the equation, the damping coefficient is determined by magnetic viscosity coefficient of the liquid and the sensor structural parameters.

Abstract: Based on the analysis of pilot handling behavior characteristics, this paper establishes the pilot transfer function model. According to the characteristics of closed-loop pilot-vehicle system and the relationship between pilot and flight quality, the specific calculation method of pilot model steady state gain was given. Take the aircraft roll angle manipulation for example, and simulate the pilot's manipulation of aircraft of dynamic process. The results show that: the pilot model steady state gain calculation method is simple and feasible, and have a certain reference value for the analysis of closed-loop pilot-vehicle system.

Abstract: In order to meet fast and accurate auto-loading, insure stable system, fast minish error, and minish interference signal influence, RBF network adaptive control based on uncertainty compensation is adopted in this thesis. By simulation, simulation results show that this control method can meet control requiements.

Abstract: The paper first introduces the importance of the time synchronization system in the coal mine power supply system and the common reference clock sources, which are GPS and Beidou system. Then, it analyzes the characteristics of the common working modes of time synchronization system. Finally, the time synchronization system in coal mine gird based on host/standby mode and spare each other mode is proposed, which provides significance for the implementation of such technology in coal mine power supply system.

Abstract: For the characteristics of electro-hydraulic position synchronous control system with long pipelines of the underwater logging device’s airbag ejection mechanism, the mathematic model of the single cylinder subsystem considering pipeline effect is established. On this basis, the tracking controller of subsystem is designed by combining a disturbance observer with a Smith predictor and the tuning method of control parameters is given using ITAE criterion. The fuzzy PI controller is designed based on a composite synchronous control scheme. The simulation results show that the proposed control method has good robust performance and can meet the requirement of high precision synchronous.

Abstract: For the screw’s lead precision dynamic testing needs, the hardware of the design includes two parts: the motion control card and the data acquisition card. We use the motion control card (GT200-SV) as the circular grating and long grating motor controller, and the data acquisition card is consist of FPGA and DSP. FPGA is the core device to realize the synchronous dynamic grating signal and inductive signal data acquisition and DSP is used to realize the function of decoding and communicating to PC by the USB bus protocol. Finally data are evaluated by the software on the computer. The acquisition speed of Screw’s lead precision dynamic detection system can reach 20 KHZ, and it has been successfully applied to a certain type of screw’s lead precision dynamic detection device in a company.