Applied Mechanics and Materials Vols. 313-314

Abstract: With the purpose of remote centralized monitoring for DC Power, the paper has the scheme of the system of on-line real-time monitoring based on Web, and emphatically introduces the design and development of the monitoring server. The system realizes collecting, storage and real-time display of multiple DC Power, which makes the crews monitor the real-time working condition of DC wherever they could access the Internet. The system has good extensibility and a promising prospect in practical.

Abstract: In this paper, trajectory tracking control of the brushless DC motor system (BLDCMS) with parameter unknown deadzone nonlinearity and viscous friction is investigated. Firstly, a global differential homeomorphism based on the recently established differentiable deadzone model is developed to linearize BLDCMS. Then, a model reference robust controller is presented to suppress the uncertainties. Finally, uniformly ultimate boundedness of the closed-loop system is proved and simulation results show validity of the proposed controller.

Abstract: In order to meet the requirements of paper envelope production automation, a synchronous control method for multiple AC servo motors is proposed and the four AC servo motors synchronous control system for paper envelope production base on a DSP is designed. In this system, DSP works as core of control, and four HCTL_2020 counters are used as decoding circuit to realize signal feedback. Feedback signals are the output signal of optical encoder on the AC servo motors, which connect to the corresponding decoder respectively. The output signals of four decoders connect to the GPIO ports of DSP in parallel. Real-time speed and position information of motors are obtained by computing unit of DSP. The PID control algorithm is designed to realize synchronous precision of four motors in speed and position. The field experiment results show that the control method is practical and the system has good stability, accuracy and efficiency in paper envelope production.

Abstract: This paper designs an automatic spectrum control circuit when the temperature change the LED spectrum can maintain stably. Automatic spectrum control circuit has two control modes, one kind for red LED another kind for green and blue LED. When temperature increases that the LED spectrum are all toward long wavelength shift. When LED current increases, the R-LED spectrum to the long wavelength shift, the GB-LED spectrum to the short wavelength shift, so at R-LED is to reduce the current as the automatic spectrum control circuit and the GB-LED is to increase the current as the automatic spectrum control circuit. It is confirmed that the proposed system provides stable spectrum within a temperature range of 10°C at R-LED and a temperature range of 70°C at GB-LED.

Abstract: Fractional order controllers which has mostly used recently have investigated in this paper. It is benefit from ball & beam system to show effects of controllers. Fractional order controller and its integer form are compared with simulation results for the mentioned system. Parameters of controllers have obtained by using evolutionary algorithms techniques which are particle swarm optimization (PSO) and genetic algorithms (GAs). According to results, it is confirmed the advantage of fractional controllers. Beside, PSO has a little bit superiority over GAs technique for determining optimum values of controller parameters.

Abstract: t is designed by adopting SUNPLUS SPCE061A version 16-bits Single Chip Microcomputer; it has realized functions as manual setting temperature, automatic temperature control, showing the real-time temperature of water. The testing mode of water temperature adopts AD590 version integrated analog temperature sensor to perceive the temperature of water in vessels and uses operational amplifier to amplify minute analog voltage signal outputted by sensor. It employs keyboard scan mode to set target temperature (40°C~90°C) and displays dynamically the real-time temperature of water with digestion. The system controls the guide circuit and closing of the heating device by using relay circuit, achieving the aim of keeping design temperature constant essentially. PID algorithm is adopted in water temperature control method. The proportion, integration and differential constant in PID algorithm are debugged with experiments in order to control the proportion of heating time and reduce the adjusting time of the system. The system boasts the advantages of high controlling precision, stability and reliability, flexible operation, strong currency.

Abstract: The dissertation comes up with an optimized design for ADRC inverted pendulum system controller based on Generic Algorithm. This design making full use of ADRC method ,which can coordinate the ability to the response time and overshoot meanwhile it can also be provided with the characteristic of high anti-jamming ability, well Robustness ability ,designing ADRC inverted pendulum system controller for improving the performance of inverted pendulum system .At the same time ,aiming at more parameter of ADRC implement-designed ,more difficult to carry on designing problem ,it conducts more excellent design of excellent parameter with applying generic optimization algorithm ,and obtains the most excellent parameter of performance .At last simulate the control model with the help of MATLAB. Emulation result indicates ,the ADRC inverted pendulum system control method that the dissertation showing has provided with well evanescence and stabilization ,less responding time without overshoot ,with more control effect.

Abstract: This paper presents the design of auto-stabilization control technique for a quadrotor system. Aquadrotor is a highly nonlinear and has to be stabilized by a suitable control technique. Therefore, the main focus of this research is to design an appropriate control algorithm that able to auto-stabilize the quadrotor at hover. The dynamic modeling of the quadrotor is described by sets of equations of motion that are derived based on the Newton-Euler formalism with the implementation of UKF for parameter identification and state estimation. The control strategy adopted includes feedback linearization coupled with Proportional-Derivative (PD) controller for the translational subsystem and backstepping based Proportional-Integral-Derivative (PID) controller for the rotational subsystem. It is developed in MATLAB/Simulink platform and is validated via real-time implementation. Both controllers give satisfactory simulation results, where acceptable peak of overshoot and small steady state errors are achieved. Experimentally, the throttle is controlled in manual mode while attitude angles are stabilized automatically. The simulation and experimental results show that the proposed controller is able to effectively stabillized the quadrotor.

Abstract: A kind of multi-sampling rate MIMO Multi-Input & Multi-Output) networked control system with state feedback in which the controller of each control loop is connected with the sensor and actuator by a network and each control loop has a different sampling period, is studied in this paper. At first its model is set up, and then this linear time-varying multi-sampling rate system is converted into a single high-dimensional linear time-invariant system by lifting technological method. Next the delay-dependent stability condition was deduced based on the Lyapunov stability criterion and the linear matrix inequality approach and the delay systems theory Finally, a given numerical example demonstrates the correctness and the effectiveness of the derivation method in this paper.

Abstract: Direct feedback linearization control was applied to permanent magnet synchronous generator (PMSG) wind energy conversion system (WECS), which was to reduce the cost of wind energy conversion system and improve its performance. The PMSG-based wind energy conversion system was constructed with mathematical models of aerodynamics subsystem, drive train subsystem and simplified electromagnetic subsystem. With feedback linearization control theory based on differential geometry, the coordinated transformation and nonlinear state feedback were obtained and PMSG wind energy conversion system was linearized. With MATLAB/Simulink platform, the model and control strategy was established and the simulation result shows this control system with feasible speed tracking performance, which can effectively implement maximum energy capture.