Abstract:The local temperature of Castresin drytype power transformer overheated can largely reduce the service life of drytype power transformer. In this thesis, a SC9 castresin drytype power transformer whose foiltype LV winding has one air duct and layertype HV winding has no duct is investigated. A simplified 2D axisymmetric physical model of drytype power transformer is established. A finite element analyzing software ANSYS is used to simulate the steadystate temperature field of the castresin drytype power transformer. This thesis also establishes and analyzes the drytype transformers’ equivalent thermal circuit model by using the analytic method of thermal circuit. The transient temperature field and the steadystate temperature field of the drytype power transformer are respectively solved by using the method of thermal circuit based on measured surrounding air temperature, furthermore, a computer program based on Visual Basic is developed.

Abstract:The telemetry data processing system is used for the tests of weapon system, and the telemetry data processing of slow variation parameters and fast variation parameters is completed in the meantime. In order to overcome the drawbacks of the old system and build a highly efficient and reliable system software, the object oriented analysis and the design method are used in this paper．On the basis of detailed analysis of system function and requirement, the use case model, the static structure model and dynamic behavior model are established using UML’s standard and general characters in modeling expression. The function structures of the system are demonstrated by visual graphical interfaces. The models describe the information exchange between system objects and system for dynamic events processing, which makes the system software design and development work more standardized and reasonable, also shortens the software development cycle. Finally, the system construction is completed and applied to the actual task successfully, and the applications prove the feasibility and validity of these models．

Abstract:This paper reports an ultralow noise sensor consisting of a novel tantalum electrode and a low noise chopper amplifier for marine electric field measurement. The tantalum electrode is manufactured by sintering high purity tantalum powders into a tight body and forming the tantalum oxide dielectric layer by anodizing the body. Electrochemical impedance spectroscopy is used to electrically characterize the interface. Noise circuit of the chopper amplifier is modeled. Electrical properties such as source impedance, frequency response and noise were measured. The measurement results imply that the chopper amplifier has a noise of 0.42 nV/rt(Hz), tantalum electrode has a noise level equivalent to a perfect resistor of 27 ohms, and the sensor system has a noise of 0.83 nV/rt(Hz). The ultralow noise sensor could be used for marine electric field measurement with high precision.

Abstract:Required discharge amount when applying UHF partial discharge transformer to detect precisely calibrated, the paper model design, build relationships UHF signal energy and discharge capacity, through visual indicators to determine the amount of partial discharge, assessing equipment operation situation.In this paper, the partial discharge source model as a transmitting antenna processing, and the introduction of Friis transmission equation, the calculation is equivalent to the antenna transmission. Experimental data measured by the statistical model built discharge collectible display, UHF signal energy and the discharge amount quadratic relation is consistent with the theoretical model.

Abstract:This paper presents a global positioning system (GPS) unmanned geophysical acquisition distributed systems. Use Cyclone V EP5CEBA4F17C and ARM Exynos 4412 as the hardware node detection equipment design. The device utilizes field gate array (FPGA) as a master. FPGA receives data from the ADS1282 merge data collected with the local GPS chip collected timestamps. ARM embedded system for realtime analysis combined data and storage. On PC terminal,aggregating data for each device and aligned according to the time stamp. Finally get synchronized distributed geophysical data of 3D image. Testing with the device showed that the system initially realized the longdistance, largescale geophysical data acquisition synchronization.

Abstract:First, the autopilot of the unmanned aerial vehicle(UAV), based on the open source architecture, is designed and developed. Secondly, the small hexcopter UAV is built for the forest fire monitoring. The significant detection method is adopted to deal with the returned fire video, and the process such as the fire candidate region selection, feature fusion, feature classification, threshold judgment is employed to judge the occurrence of forest fires. If a fire occurs, the algorithm can compute the shape, area and spread speed and other information of the fire automatically, and start warning with the help of the photoelectric smoke sensor. The system has the characteristics of vertical takeoff and landing, low demand for weather, low use and maintenance costs.

Abstract:The quick and precise locating of partial discharge(PD) inside switchgear is important in eliminating the hidden faults promptly and ensuring the safety and stability of the power system. PD source will be located at a certain compartment of switchgear by setting up multiple sensors with different arrangement. Then, using the hyperbolic method and spatial grid search method can finally determine an accurate position of PD source in a compartment based on the simulation results of a simplified compartment XFDTD model. A switchgear PD location experimental platform is established in laboratory which verify the validity of the positioning method.

Abstract:In order to improve the maintenance efficiency and realize the rapid diagnosis of the single board fault, the fault detection platform of the inertial navigation system is designed and developed. The detection platform hardware based on FPGA logic cell and communicated with PC by ISA bus, the software develop driver program and call functions program called by the upper procedure using Visual C ++, the user interface, test procedures and control process using Virtual Instrument LabVIEW. Finally, with SM_MB card as an example implementation of single board fault detection platform test. The results show that, the platform is easy to operate and trustworthy, to meet the requirements of the fault rapid diagnosis test of the inertial navigation system electronic single board of the tracking ship.

Abstract:To solve the problem that low measuring accuracy and bad realtime caused rocket engine working condition analysis difficult. Based on the characteristics of a rocket engine turbopump rotational speed signal and telemetry signals rules this paper proposed a cycle method measuring the rotational speed of liquid rocket engine turbopump based on CPLD. Designed the speed signal cycle extraction, transmission and channel coding method in telemetry system. Using the Quartus II software simulation process of speed cycle measurement. An original products took part in the telemetry system test. The results show that digital engine speed measurement method better than lower frequency method in measurement accuracy and realtime performance. It can solve the problem that rocket engine is immeasurable In the period of Speed change quickly like accelerating period and shutdown periods.