Advanced Materials Research Vols. 655-657

Abstract: According to the idea of the modular design, an intelligent wheelchair control system based on F28335 is designed. This paper introduces this system, including the whole structure, hardware composition and corresponding software design. Control mode of the intelligent wheelchair is divided into manual control and automatic control mode. Using the operating lever, brain wave control signal and hands, users can let the intelligent wheelchair go forward, go backward, turn left, turn right, accelerate and stop. This control system has a lot of advantages, for example, simple structure and easy to expand functions and so on.

Abstract: According to slipping between the driving drum and the belt in motion of the belt conveyor, this article uses the intelligent speed sensor to transfer pulse signal into PLC high-speed counter, then realizes the relevant control through program processing and real-timely shows the value of the belt speed by text display. It completes the detection and display of the belt speed by real-timely, realizes the integration among the belt speed monitor and other control parts, reaches the purpose of slipping protection.

Abstract: In the industrial production of polyvinyl chloride (PVC), large number of loops and low self-control rate can cause a few problems, such as poor loop tuning of PID regulator parameters, poor maneuverability of automation, big device fluctuations, lots of alarms as well as the lack of stability. Thus, control procedure optimizing and PID algorithm are adopted to control the system. Firstly, operating point without automation before is to put into automation now. It aims to improve the operational stability and reach the device self-control rate to more than 95%. Then, advanced control theory is adopted to optimize the controller form and tuning PID parameters to achieve fast response, strong anti-jamming, device control stability effect.

Abstract: On the basis of studying the transformer condition assessment, the paper put forward the monitoring framework of the transformer cooler based on the intelligent electrical grid, and developed the intelligent monitoring system of the transformer cooler based on the DCS and dual PLC. The system used the DCS and dual PLC redundancy, the intelligent controller of the motor, the system’s platform for the centralized monitoring, the environmental control system and the other advanced technology, and implemented the monitoring, remote control and status monitoring of the transformer cooling system to improve the reliability and adaptability of the transformer cooler system. The system can be applied for the intelligent electrical grid. The above technologies are innovative in the high-performance distributed bus, the integrated design of three-phase solid state relay and magnetic latching relay and the cooling technology of the semiconductor in the PLC module, and lie in the leading domestic level.

Abstract: With the oilfield development entering into high water cut stage, ESP (Electric Submersible Pump) was widely used with its strong oil recovery capacity. At present, there is a big gap in ESP control technology between ours and overseas, the traditional line frequency control failures frequently, has low system efficiency, serious energy waste and high operation cost, and frequency conversion control can't real-time automatic adjustment. According to these existing problems, fuzzy control was introduced into ESP system control, a fuzzy control algorithm was put forward by this paper, then fuzzy controller was realize by using PLC programming. This control system not only reserved the flexible, reliable and strong ability to adapt characteristics of PLC control system, and improved the of intelligence level of the system. Ensure esp real-time efficient and reasonable operation, prolong operation life, and enhanced. With this control system, ESP can real -time run efficiently, prolong the operating life, enhance the system efficiency, save energy and reduce consumption

Abstract: In cold strip or foil rolling, flatness control is an integral part of modern mill. This paper introduces two typical flatness control systems, pattern recognisation flatness control system and multivariable flatness control. It is found that the latter is effective and has wider application fields. The FEM models of its core parameters, flatness actuator efficiency, are constructed. Influencing factors, such as the rolling force, bending force as well as the tilting force are discussed. Control strategies are proposed for foil rolling. The results demonstrate that the control strategies can reduce flatness error and improve flatness quality.

Abstract: Because ordinary hydraulic system exists multiple fault, power waste and hard controlling in actuators due to the complexity of actuators and variability of load. A new hydraulic system based on the load sensing technology is designed for the new type steel arch installing machine. The results of the simulation for forearm loop based on AMESim show that the designed hydraulic system is energy-efficient and load sensing function is effectively achieved, the actuator control performance is well.

Abstract: Thrust system is the key system of casing rotator. A thrust hydraulic system with flow adaptive control is designed, operating principle and control method are elaborated as well. In order to investigate the dynamic characteristics of the thrust hydraulic system, simulation analyses with the combined platform of AMESim and MATLAB/Simulink are carried out. The simulation results show that the designed thrust hydraulic system can meet the driving velocity requirement and reduce the overflow loss.

Abstract: Some special operations of chaotic vibration mill require not only has a certain frequency high vibration intensity but also can effectively control overtime and over-limited of vibration intensity. The validity of advanced control decision is key technology for chaotic vibration mill to achieve some special operations such as super-hard and superfine grinding. Through the application based on the intelligent frequency conversion of PLC advanced control system, the high vibration intensity exceeds 15 presents discontinuously and the transient super-high vibration intensity exceeds 20 presents 3 times shortly. By comparing with conventional vibration mill, it shows that the advance control system can control high vibration intensity effectively, and the engineering effects of the deaggregation and refinement of super-hard and superfine grinding is obtained.

Abstract: A simulation model of EV with the software of AMESim was established and the ABS control method with four independent channel by electric brake was designed in Simulink with the fuzzy logic control. The simulation is carried on under the low tire-road friction coefficient. The simulation results show that, the co-simulation model and its control method is able to simulate the actual ABS braking process, ensure the wheel speed well follow the vehicle speed, improve the steerability and stability of the EV. Model parameters can be adjusted, so research on different parameters on the effect of ABS can be carried on, and the simulation model can be used as a well platform for ABS study on EV.