Advanced Materials Research Vols. 299-300

Abstract: In the cable car work process, the performance of valve control motor system directly influences the drum controlling accuracy and stability. In order to analyze the dynamic characteristic of servo hydraulic system and optimal design parameters, cost reduction and shortened product development cycles. Aiming at the cable car valve control motor major components of hydraulic system are analyzed, establishment of the math model, and deduces the transfer function. Using matlab software of system analysis of time domain. The results show that the system well meet the design requirements, and has good stability, and to the cable car drum the servo control system design and testing has laid a solid theoretical foundation.

Abstract: Design and implementation of system of wireless-monitoring for goods train is based on ZigBee technology. The system is consisted of ZigBee monitoring nodes on-site and handheld display terminal. The JN5139 wireless microprocessor is used as the master controller for ZigBee monitoring nodes, which is produced by JENNIC Ltd. in Britain. ZigBee device nodes automatically form wireless sensor networks, and use door magnetic sensor circuit which has high sensitivity and fast response to monitor the status of the door. The alarm information about the status of the door will be transmitted to the handheld wireless terminal to display and alarm. RFID technology is useful in conditions that mobile and car numbers are arbitrarily setted for freight transport in the process of practical design. Furthermore, modular design is used to facilitate the maintenance of the system and improve the capabilities of real-time, reliability, stability and anti-jamming.

Abstract: Association rules mining is an important branch of data mining. Apriori algorithm is a classical algorithm of mining association rules. Based on the original Apriori algorithm an improved Apriori algorithm is analyzed according to the multiple minimum supports and support difference constraint. An experiment has been conducted and the results showed that the new algorithm can not only mine out the association rules to meet the demands of multiple minimum supports, but also mine out the rare but potentially profitable items’ association rules.

Abstract: The problem of H_∞ control for networked interconnected system with unknown disturbance is discussed. The Takagi-Sugeno (T-S) fuzzy model is adopted for fuzzy modeling of the networked interconnected system, considering the problems of time-delay and data packet dropouts for networked control. According to the Lyapunov stability theory and decentralized control theory of interconnected system, based on LMI method, the paper proposes the sufficient condition that ensures the asymptotic stability and satisfies the H_∞ performance. Finally, the numerical example and simulations have demonstrated the validity of the method.

Abstract: In this paper, it is first time that partial squares sum combined with orthogonal design according to the characteristics of quality assurance system, and applied to the reliability predicting and allocation, therefore, We may get the best reliability allocation.it has more important role to device new production.

Abstract: An iterative learning servo controller with RBF network feed-forward position compensation is proposed to control the mover of permanent magnet linear servo system to track reference position signal. The structure of RBF feed-forward position controller is analyzed in detail. The effective estimation of nonlinear load is realized by higher-order D-type iterative learning identification method. The feedback position control law was made up of load identification and feedback error signal. Finally, the simulation results demonstrate that this method can assure system obtains good servo performance.

Abstract: A novel quasi-resonant single-stage single-switch PFC flyback converter is analyzed. By the additional winding, power factor correction can be achieved, and the topology can be simplified. The circuit can work in quasi-resonant mode, so the switching loss is reduced. By means of digital frequency reduction, the efficiency of the converter is improved further.

Abstract: With the rapid progress of Computer and automatic technology, automatic control has widely used in the production, which brings fresh vigor to the sewage treatment.The application of PLC technology to the sewage treatment process of the oily water station, not only improves the operation of the sewage station efficiency and economic, but also reduce the amount of labor of workers. This article designs the sewage treatment system, descrips conduct details for each object function, improves the backwash of frequency conversion control system, and realizes the scientific management of sewage treatment station.

Abstract: A new Structural analysis method of voltage stability in large power grid is proposed based on the eigenvalue Method in this paper. the method establishes an improved current injection model of Y+D matrix of the topological structural characteristics, which is helpful to the study of mechanism of voltage instibility. Through calculating the eigenvalue of the Y+D matrix, influence of network topology structure to the voltage stable in the electrical power system is analyzed. The simulation results show that voltage stability has close relationship with topological structure of the power network structure.

Abstract: The heavy shell ring rolling process was taken as subject investigated. Because the size of shell ring is very large and the material of shell ring is special, in order to make the shell ring to be bitten smoothly and make the rolling process stable, the double drive rolls was proposed in the shell ring rolling mill. The thermal simulation test of heavy shell ring material was made on the Gleeble 3500 thermal simulation test machine. Based on FEM, the three dimensional thermal mechanical coupled model of shell ring rolling process was built in this paper. The influences of process parameters on the stress field, strain field and mechanical parameters were investigated. Simulation results show that, with the increase of feed velocity, the strain of shell ring increases, the forging penetration condition becomes good; With the increase of friction coefficient, the equivalent plastic strain of shell ring surface layers increases, the equivalent plastic strain of shell ring middle layers has little change. The conclusions are significant for designing equipments of shell ring rolling mill and developing new rolling schedule.