Applied Mechanics and Materials Vols. 313-314

Abstract: Based on the hybrid vehicle model in AMESim, the real working conditions of an induction motor are analyzed and the drive system’s physical simulation models are built in AMESim. The direct torque control system is designed. And the control system runs by AMESim/Simulink co-simulations. Hence, the feasibility and effectiveness of the proposed design is verified.

Abstract: A fuzzy-PID controller is developed and applied to the active suspension system for the ride comfort enhancement of a half-vehicle model. A four degree-of-freedom vehicle model with active suspension system is proposed, which focused on the passenger’s ride comfort performance, and a fuzzy-PID controller is developed by incorporating the fuzzy logic control mechanism into the modifications of the PID structure. The performance of the proposed controller has been verified by comparing it with passive control method in MATLAB/Simulink. The simulation results indicate that the developed fuzzy-PID controller enhances the ride comfort performance of the vehicle active suspension system by reducing the body acceleration and pitch angle significantly.

Abstract: In order to provide stable and adjustable current source for portable systems, this paper designs a digitally controlled constant current source. According to the input of independent key, the output of the microcontroller digital volume controls digital-to-analog converter by Voltage-Current conversion module to get the constant current output. The output module consists of the operational amplifier and the power transistor TIP122, which is used for voltage-current conversion. At the same time, the value of output current is obtained by sampling resistor to convert the real-time acquisition and monitor the output of constant current source. The experimental results show that the system output ranges from 0 mA to 240 mA. The value of constant current can be controlled by stepper key, and the measurement error ratio can meet the requirement of design.

Abstract: This paper focuses on the composition of the Heavy-medium coal separation automatic control system, control methods and its functions. Introduced the main testing instruments and actuator in the control system. The system achieved good results in the Tangshan Rongyi Coal Preparation Company.

Abstract: Based on S7-200 PLC, pressure sensors and amplifiers, this paper uses PID instruction to establish the closed-loop pressure control system of the required thrust in turning airbags. So in the automatic overturning airbags, it is capable to real-time control the push rods running status.

Abstract: The paper presents an asymmetrical structure of X-quadrotor, which is different from the traditional quadrotor and is more complicated in the analysis of control forces and moments. A novel control method based on backstepping is applied in the attitude loop. And the compensation for perturbations of outer environment and noise of the measurements has been done. Then, various simulations are performed and the results show the system has a quick response with small overshoot and good dynamic characteristics. Finally, the experiments are implemented on the prototype. The flight test data has validated the robustness of the control algorithms.

Abstract: An indirect adaptive fuzzy sliding mode control scheme for a class of discrete-time systems with model uncertainty and external disturbance is developed. In this approach, a discrete-time exponential reaching law is used to obtain the ideal sliding mode control law. Then, two fuzzy systems and a third one are used to approximate unknown functions of the system and the switch-type control in the ideal control law, respectively, wherein the consequent parameters are adjusted by an on-line adaptation law with parameter projection. Towards to Tank pressurization system, experiment results have shown the effectiveness of the algorithm.

Abstract: C8051F021 is a fully integrated mixed-signal System-on-a-Chip MCU. It is applied to rolling bearing testing, and portable rolling bearing testing machine is realized. Performance and integrated level of the system are improved greatly for C8051F021 application. The hardware structure of the system is discussed in this paper, and the key codes of information acquire is also given.

Abstract: Weighted multiple model adaptive control is a combination of off-line design and on-line decision, which combines a finite number of simple controllers by weighting algorithm. Its an effective means to solve the control problems of complex and uncertain systems. Active Disturbance Rejection Control (ADRC) is a new digital control technology with high accuracy and strong robustness. This paper introduces ADRC as local controller in the weighted multiple model adaptive control system. The simulation results show that the proposed system has strong robustness in a wide range.

Abstract: The traditional heating system just controls the heat source by the PLC,but it dose not control the heating pipe.so it can not solve the problem that it is hot near the heat source but cold when far away from it.The problem of pipe network imbalance also can not be solved.To solve these problems,we design an intelligent control system of pipe network,which combine the traditional heating control system to realize saving energy.This paper introduces the design thought of the application of Siemens programmable controller in heating pipe network,and elaborate on the hardware design and the software programmable of the control system.The actual system operation shows that the remote monitoring system of heating pipe network based on Siemens PLC is high reliability and high stability, and the effect in energy saving is remarkable.