Advanced Materials Research Vols. 718-720

Abstract: Compared with conventional switching power supply, EV on-board charger has more performance indicators and wider output range so the test is more complex. It need set various conditions to test charger electrical performance and the test will generate large volume of data. Although the precision and function of data acquisition equipment have increased dramatically, but the equipment cant directly determine the performance of a charger. Analysis software of the on-board EV charger testing data is developed based on the on-board EV charger testing hardware platform. The real-time database is used in the software for data management and the algorithms are used for analyzing the test data. The user can choose automatic mode or manual mode to achieve the analysis. The software can comprehensively analyze large amounts of test data, so that the test result is more reliable and accurate. Development of the software provides a way for realizing rapid automatic test to on-board charger.

Abstract: In order to measure heat flux in micro scale space, a thin film heat flux sensor is designed, fabricated and calibrated. Vacuum coating technology is applied to fabricate the sensor with a total thickness of 0.49μm. Silicon dioxide wafer is used as substrate. Cobalt and stibium is deposited on the substrate to form thermopile. Correlation coefficient R is 0.94025. Sensitivity of the heat flux sensor is 0.05062 μV/(W/m²). Time constant of the sensor is 0.66044 seconds. Dynamic test shows that the heat flux sensor responds rapidly to periodic heat flux which is supplied by halogen lamp.

Abstract: The present work is a preliminary work on the development of NIR camera photograph as alternative tool for corrosion product identification. Corrosion products were taken from two different carbon steel tubes side, one is from thinning tube side, the other is from normal tube side. From optical microscope data, it was observed that the thinning tube side surface has elongated microstructure while the other has normal microstructure. It was also observed that more stable oxide in the form of hematite formed on the thinning tube side, while the other side has siderite and magnetite as the corrosion product. From NIR camera photograph on the scale of both tubes side, it was obtained significant differences in the digital image number. It is expected that after further comprehensive collecting digital image number data on the various corrosion product as well as thickness layer, NIR camera photograph can be used as an alternative method for corrosion product identification.

Abstract: 2351 working face of Daizhuang coal mine is paste filling working face, its mining method is full mining and full backfilling. It is expected that its surface deformation is very small and traditional surface deformation monitoring method is difficult to meet high-precision demand. In order to meet the high precision of measurement area in Daizhuang coal mine, the combination of GPS.RTK and electronic level were studied to measure filled working face, which has achieved good results.

Abstract: The Entropic stochastic resonance (ESR) is the appearance of stochastic resonance (SR) when the dynamics of aBrownian particle takes place in a confined medium. The presence of unevenboundaries, giving rise to anentropic contribution to the potential, may upon application of a periodic driving force result in anincrease of thespectral amplification at an optimum value of the ambient noise level.The ESR provides a way for weak signal detection, and this paper applies it to bearing fault diagnosis. Preliminary numerical simulation andexperimental result of practical bearing test signal show that the ESRhas a good effect on weak feature extraction and bearing fault detection.

Abstract: This paper introduces a spindle error separation technique called orthogonal mixed method. The problem of harmonic suppression is solved by the orthogonal mixed method, which exists in the process of measurement based on three point method.The measuring system consisting of a displacement sensor and a angle sensor is developed for spindle error and roundness measurement. Two sensors, which are placed in the same plane perpendicular to the spindle axis, are mutual into 90⁰. The principle of the critical angle method of total reflection are used by two sensors to separate rotation error from spindle error. Above all, the measured results show that this method indeed solve the problem of harmonic suppression, make the results of measurement more accurate.

Abstract: A multi-sensor integrated solution that combine complementary features of the Global Positioning System (GPS), inertial navigation system (INS), and magnetometer is presented due to GPS-aided inertial navigation system (INS) provides poor observability of heading angle. In addition, Based on the principle of federated Kalman filtering and Adaptive Extended Kalman Filter, the algorithm is presented also for accuracy of positioning and attitude, rapidity, and error tolerance of the navigation system. The algorithm is implemented in the integrated navigation system. Experimental results show that the observability issue is solved and improvement in accuracy.

Abstract: It is of vital importance for the pressurizer to maintain the pressure of primary coolant because the sharp change of coolant pressure has a direct impact on the security of reactor. The study of pressurizers pressure control method is highly important and meaningful. This paper presents the researching and designing on pressure control system of a pressurizer implemented in a nuclear power plant. Both the present situation of the nuclear power and some relevant background have been briefly introduced. Proceeding on the records of simulation, we succeed in establishing the applied modeling of pressurizer and further propose the PID control technology working as control algorithm. The best set of controller parameters are chosen through comparing the results including regulation time, overshoot suppression and stability. On the base of such control method, we attempt to add neural network control technology to achieve further improvement, which turns out available and satisfying.

Abstract: In this paper, a novel approach to improve the infrared cooperative object for accurately landing is proposed. We present the designed cooperative object system and the blurring around the object when its working, and then begin our basic research on the cooperative object. We analyzed the formation principle of thermal blurring in the infrared imaging mechanism. After a detailed analysis infrared thermal blurring from thermodynamic principle, we derived the main factors of the infrared thermal blurring, and used Fluent simulation software to simulate the formation of thermal blurring. At the same time, the paper optimized the design of cooperation target to reduce thermal blurring. Experiments show that the optimum design of the cooperation objectives thermal blurring has significantly improved compared with some other methods.

Abstract: The nonlinear equations of motion were constructed for a supersonic anti-warship missile. In order to estimate the unknown angle-of-attack, a sliding mode observer was designed. The convergence capability of the sliding mode observer was analyzed according to the Lyapunov stability theory. A sliding mode controller was designed to drive the missile normal overload output to track its command, based on the output-redefinition approach. In order to confirm the performance of the designed sliding mode observer and controller, a simulation example was carried out for nonlinear missile model. The simulation results show the fast convergence capability of the designed sliding mode observer and controller.