Applied Mechanics and Materials Vols. 556-562

Abstract: This paper presents a protocol to improve traditional CSMA protocol: DP-CSMA/CA protocol. In this paper, it is used in the design of WSN communication system based on FPGA. By using the method of the averaging period, we give the throughput parameters of this improved system. Simulation results confirmed that the DP-CSMA/CA protocol improves the system performance. The FPGA design is also effective to improve the performance of module in WSN. We completed the design of system based on DP-CSMA with FPGA. The test results show that: throughput are improved, packet collision is reduced, and channel utilization is improved in different load. This system has the features of simple circuit, high reliability, and programmable upgraded.

Abstract: In order to achieve the anti-submarine capabilities of helicopter, it is essential to design the automatic transition controller. According to the basic requirements of automatic transition control mode and the rational use of limiter and exponential law, the control loop of altitude and ground speed is designed. And the control between the two channels must be coordinated, so that when altitude descends to hovering altitude, ground speed close to zero simultaneously. In this paper, the method of model reference adaptive is used to correct the altitude deviation which makes altitude trajectory followed the set rules. The simulation shows that the method can make the altitude trajectory track the desired trajectory in good.

Abstract: Concerning the intelligent technique control of automatic winder in textile production, the tension of yarn in unwinding and winding process is a key factor among various technical parameters, the speed known as linear and rotational speed and the position of yarn layer on bobbin will definitely affect the dynamic tension of yarn during the winding process. the photoelectric encoder sonser is used for measurement of the rotationtional and linear speed of cyclinder of winder machine. Position sonser can detect the amount of the remaind yarn layer on bobbin so as to regulate the position of the tension controller to make the dynamic tension to be uniform and approporite.

Abstract: In order to make the shell production automatically and efficiently, reduce the injury to the worker’s health caused by the harmful dust, this paper describes an automatic shell production line controlled by PC and PLC. The executive body of the shell production line is robots, PLC transmits signals between robot and PC. The new automatic shell production line can not only stucco but also possess the features of smooth operation for shell making and reliable use and low noise. It has been proved that the shells automatic production line has improved production efficiency, reduce the contact with harmful environment of manipulators greatly, and make the production process are controlled well and safely.

Abstract: This paper designs a single neuron PID controller for the loading system which can simulate the load in the process of landing gear turning. As artificial neurons have the adaptive, self-learning and more fault-tolerant characteristics, the controller based on single neuron PID can improve performance of loading system. To assess the effectiveness of controller, united simulation between Matlab/Simulink and AMESim was conducted. Obtained results show the proposed approach is satisfactory in fast response, small overshoot, high control accuracy, strong anti-interference ability and robustness when compared with traditional PID controller.

Abstract: In this paper, we study the flux-weaken control with the method of the advanced angle of currents in the interior permanent magnet synchronous motor of the electric cars. We adopt the first-order digital filter to handle the data acquired from three phase currents and realize the speed and current double closed loop control by the incremental PI regulation. In Matlab/Simulink, we build the flux-weaken control system simulation model with the double closed loop. For the 40kw IPMSM, we develop the experimental platform based on TMS320F28335. The simulation and experiment archive a good control effect.

Abstract: Since the resource of the sever in embedded remote control system is limited, an approach is presented which use CGI and XML technology to realize remote monitoring computer and embedded Web server for dynamic interaction. Combined with the basic requirements of embedded remote control system, the idea of component design is proposed, the major components of system functions are defined. According to the system functional requirement, the software is designed and realized. The practice prove , the scheme realize the remote control of the transmitter by the small cost . And the system is convenient and safe. The definite reference value is offered to the offspring complex remote control system.

Abstract: Avoiding obstacle control strategy of Mobile robot based on Artificial Potential Field is addressed in this paper, detecting ambient by use of sonar sensor .Setting target point and the moving speed arbitrarily in mobile simulation environment, these avoid obstacle moment are conducted successfully.

Abstract: Using wavelet packet achieve the reduction of the Multispan deep hole drill pipe system, effectively reduce many-degrees of freedom system.It gets a good control effect according to ER / MR damper characteristics and semi-active control theory, designs neural network controller according to intelligent control theory and proposes semi-active control algorithm that has been created the neural network of deep hole drill system. The project supported by the National Natural Science Foundation:Research straightness control of deep hole processing technology based on multi-body system theory (51175482) and National and international cooperation: Cooperative research key technologies of sophisticated and efficient deep hole machining (2013DFA70770)

Abstract: This paper mainly studies the reliability of trackside subsystem of the CTCS-3 train control system. Dynamic fault tree method is used for reliability analysis. The fault tree is decomposed into static and dynamic sub-trees. Based on Markov method, precise quantitative analysis is performed on the dynamic sub-tree. The failure probability of the trackside subsystem is calculated. Through analyzing the structural importance degree and pivotal importance degree of the bottom events, suggestions for improving the reliability of the system are concluded.