Applied Mechanics and Materials Vols. 543-547

Abstract: Based on fuzzy logic control adaptive bandwidth PLL design is presented for the problem of tracking poor stability and low accuracy when a certain type of radar tracking dynamic spacecraft. This method is mainly through fuzzy logic controller, adaptive level is determined by control rule of input respectively, and the outputs of rules are weighted combined to control the coefficient of loop filter, thus adjusting automatically the loop bandwidth, and enhancing the tracking stability of radar equipment and improving ranging accuracy. The simulation results show that the fuzzy logic control adaptive bandwidth PLL has higher tracking stability and accuracy.

Abstract: This paper developed a 6-DOF (degree of freedom) PC-Based robotic arm system. The system mainly include in software platform and servo control card, servo control card based on microcontroller STC12C5A60S2 was designed to drive the servomotor connected with each joint of robot. The software was implemented by combining MFC with OpenGL. By using the OpenGL functions, the software is able to draw and simulate the 3D kinematic scheme of the robot, it also provides 3D motion planning simulation feature. With the help of simulation in the GUI, users can visualize the manipulator motion planning. Furthermore, user also can control the real robotic arm through this software. Finally, point-to-point motion and continuous path motion are all tested in simulation and real robot control. The entire system has been successfully implemented.

Abstract: In this paper, we focus on the configuration software programmable controller (PLC) teaching in applications by the simulation examples of the mechanical hand, delivering car and elevator control system. The development of this system includes PLC programming design and program development of configuration interface control. The former requires programming and hard ware design of PLC based on the basic function and control requirements of controlled objects. For the latter, the configuration software is used designing simulation interface and program. Through the connectivity and communication between configuration software and PLC equipment, teacher can develop various configuration simulating control system in need to achieve the implementation of PLC programming teaching in visualization.

Abstract: A design of regenerative braking system (RBS) for a pure electric bus was presented in this paper. A design of regenerative braking system for a pure electric bus was presented in this paper The control of regenerative braking was achieved by Pneumatic ABS and improve braking energy recovery under the premise of ensure braking performance. Regenerative braking control algorithm was mainly composed of two parts for the identification of the drivers intention and the brake force distribution. The regenerative brake control model was built in the matlab/simulink environment, rapid prototyping control was achieved by Autobox and vehicle test was carried on. Result shows that the control strategies can effectively make the pneumatic brake system and motor brake system work harmoniously.

Abstract: A model reference adaptive modeling method of ball screw feed system is proposed. Using a low-level system with excellent dynamic characteristics as the reference model and ball screw feed system as the controlled object, this paper establishes model reference adaptive system by Narendra program, achieving exact match between the adjustable system and the reference model through experiment and deriving the low-level model of the ball screw feed system. Then taking the X axis of X-Y work table as an example, a second-order model of the ball screw feed system is established by this method. When 40000 pulse signals are input into the model and the ball screw feed system in 160s respectively, the output error between the two is within ± 0.005mm, thus testifying the higher accuracy of the model obtained.

Abstract: Accurately identifying road condition can send relevant information to the motor control system, so that control system of the motor can adjust the control strategy timely, eventually, the intelligent and optimal control of electric vehicles is realized. In this paper, according to these mathematical model, the permanent magnet synchronous motors simulation model and vehicles simulation model are proposed. Then, output torque of motor and speed of motor are served as the input of RBF neural network, which helps road condition to be identified. The simulation result shows that the road condition is well identified by proposed method based on RBF neural network.

Abstract: Traffic congestion is a major concern for many cities throughout the world. Developing a sophisticated traffic monitoring and control system would result in an effective solution to this problem. In order to reduce traffic delay, a novel urban arterial traffic signal coordinated control method is presented. The total delay of downstream and upstream vehicles is considered and the function describing the relationship between vehicles delay and signal offset among intersections is established. Finally, comparing the performance of traffic signal under method proposed in this paper with the traditional isolated traffic signal control method, the microscopic simulation results show that the method proposed in this paper has better performance in the aspect of reducing the vehicles delay. The offset model is tested in a simulation environment consisting of a core area of three intersections. It can be concluded that the proposed method is much more effective in relieving oversaturation in a network than the isolated intersection control strategy.

Abstract: Aerospace plane, the next generation manned spacecraft has the characteristics of high reliability and high security. Therefore, a five modular redundancy byzantine fault tolerant architecture is propose for the guidance, navigation and control (GNC) system. This architecture can give the system characteristic of double fault resilience, and is also suitable for solving Byzantine general problem. A semi-physical simulation is done, which is based on 1553B data bus and VxWorks operating system. The simulation result has verified the fault tolerant architecture and feasibility of the system implementation.

Abstract: An automatic programming controller system based on the milling processing feature was proposed in this paper. Firstly, through the analysis of milling feature and the relationship of that, a part milling machining feature model is established. Secondly, on this basis, the article introduced the XML files technology into the automatic programming system and designed structure of XML files for storing parts process and shape feature information. At last, this paper sets up the automatic programming controller system composed of the human-machine interface module; XML files access module and NC program algorithm module. The advantage of the controller is easy to maintain and upgrade and there is a certain practicality in machining.

Abstract: For the control of greenhouse environment parameters, a combined control system of the temperature and humidity inside the greenhouse according to the fuzzy control theory is design, which is of distributed control structure. The whole control system is divided into upper computer (personal computer) and the lower machine (SCM). Upper machine and lower machine adopt the Modbus fieldbus to communicate, which can effectively improve the efficiency of communication, to ensure accurate communication. Tracking control of temperature and humidity in the control system uses fuzzy control technology, which can effectively summarize and utilize human control experience, and regulate the environmental parameters according to need of crop growth automatically. Finally, through experiment, it is proved that the control system has achieved the anticipated target.