Advanced Materials Research Vols. 317-319

Abstract: Springback is the prominent problem in bending forming of sheet metal, which is difficult to control accurately, especially for the bending plate with complicated shapes. In this paper, the scheme of intelligent bending control system of wide quadrangle plate was proposed by using the neural network technology, and the experimental system of sheet bending intelligent control was also established. The key contents of the experimental system are real-time acquisition and control to signal, which is the technical support for achieving intelligent control of sheet bending successfully, including monitoring, collection, processing and control to signal. Control system and signal acquisition of intelligent bending for wide quadrangle plate was developed in this paper by using the virtual instrument technology and LabVIEW (Laboratory Virtual Instrument Engineering Workbench) as system control software. The experimental results show that the error of side-wall angle and flange angle of plate after springback is small, which indicates that the control system of intelligent bending with the signal acquisition and control system as the core is feasible.

Abstract: A time-delay predictive control algorithm based on immune computational intelligences is proposed in this paper. The predictive control parameter was optimized through immune clonal selection. Which avoids calculate Diophantine equation and inverse matrix, reduces the input dimensions of the nonlinear map. Simulations were conducted on the time-delay system, non-minimum phase of the process system, divergent system illustrate that this approach is a feasibility and effectiveness way and demonstrate its rapid responds, small overshoot and high adaptability for time delay system.

Abstract: In order to make Russian-made atmosphere computer can be connected the domestic ATC（Air Traffic Control） transponder, the interface circuit, consisted of single chip microcomputer, A/D converter, level converter, driver circuit, isolator and electrical power, is designed. The data correlation and anti-jamming techniques are adopted to simplify hardware and to enhance conversion precision of height data and anti-jamming performance of the system. The test shows that the interface circuit can convert the analog height signal to digital encoding signal fit the requirements for domestic ATC transponder.

Abstract: The malfunction of short-circuit protection became increasingly serious in the fully mechanized face casused by large power equipment, more kind of loads and long distance power. According to the field requirements, the electrical characteristics between motor starting and three-phase short-circuit are compared, the phase-sensitive protection circuit combining current signal amplitude with power factor is designed, the protection data is tested and the protection characteristic is analyzed. The phase-sensitive protection circuit has been uesd in KJZ-4000-10（6）/3.3 flameproof and intrinsically safe load control center. The circuit is stable, sensitive and reliable. It has been proved that the short-circuit protection of power in underground is reliably realized.

Abstract: With the development of science and technology, higher and higher quality requirements were needed by the electrical consumers about the power energy in power supplying and distributing. For this objective, many kinds of power electronic equipments are applied in power supply systems and distribution systems in order to improve the system running stability with their rapid response operation characteristics. But at the same time, the power electronic equipments may generate some hidden dangers that can not be overlooked to the system, particularly to the reliability of protection.

Abstract: In this paper, it mainly researches control arithmetic of electro-hydraulic servo system. In a tele-operated master-slave control system, a Fuzzy PD control strategy is adapted. In order to obtain real time track control to system and improve dynamic and static characteristic of system, three control parameters of PD are optimized by Genetic Algorithm (GA). Experimental results are shown that the sense of force is produced on the joy stick and the operator is able to feel sensitively the reaction forces. Secondly, the novel control strategy and optimization fuzzy PD arithmetic has good track precision and improves master-slave track characteristic of displacement and force feedback characteristic. At the same time, it has rather strong self-adaptability and anti-jamming capability.

Abstract: Steady operation was one of the main objectives of wind turbine controlling. Online monitoring and fault diagnosis system had been installed on the wind turbine, the characters of system natural frequency were obtained by comparing collecting datum in site with theory analysis result. Wind turbine rotation speed should avoid [8.4r/min,10r/min] base on the characters to guarantee no resonance and avoid severe vibration. Such realizes wind turbine steady operation.

Abstract: Check valve is an important fluid control component of pressure pipeline system, shuttle-type high-temperature, high-pressure, anti-erosion special valve is a new type of check valve. The simulation with CFD software Fluent and analysis for its internal temperature field was done, and then make a comparison between Shuttle-type high-temperature, high-pressure, anti-erosion special valve and swing check valve, and it can be concluded that the former doesn't exist local thermal stress concentration. Ultrasonic speed in high-pressure water and steam rely on its temperature, according to this relation, it can be calculate the temperature of fluid in the valve by measuring the transit time of ultrasonic.

Abstract: Due to the high-speed, short-time countermeasure and small target strength of underwater high-speed small targets (UHSST), it is difficult to use a traditional method to accurately detect UHSST. So a novel passive detection model based on three-dimensional hyperbeam forming (3D-HBF) and fuzzy support vector data description (FSVDD) is proposed, where these advantages of beam width reduction and side lobe suppression for 3D-HBF and excellent target-detection capability for FSVDD are combined. The model consists of two stages. In the first stage, 3D-HBF is carried out to obtain the beam respond vectors (BSV) from original underwater acoustic signals. In the second stage, the BSV are input into the detector based on FSVDD to detect and locate the underwater targets intelligently. This model is applied to target detection of UHSST, and these testing results show that the proposed model has better detection performance than the conventional beam forming method, with a high detection success rate and localization capability.

Abstract: The campaign life of a modern blast furnace is determined by the residual thickness of the refractory in the hearth and it can be prolonged by adjusting operating conditions based on a reliable online monitoring system. A new methodology, combining a 1-D heat transfer model and a statistical model to predict the inner profile and the refractory lining of a blast furnace during operation respectively, was established in this study. The application of the developed online monitoring system on a blast furnace was used to demonstrate the effectiveness of the models.