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The characteristic of the driving torque generated by the superconducting motor is analyzed. The magnetic field distribution of the stator coils and the driving torque at the different position are calculated by FEM software. According to the rotation position detected by the fiber optic sensor measurement system, the motor can drive the rotor accelerating or decelerating rotation conveniently by...
The electrical jointing of superconducting wires / tapes is a key issue for the construction of the scientific superconducting magnet that required high field stability, such as NMR, FTICR-MS and some inertial navigators. In this paper, the preliminary experiment of electromagnetic formed NbTi superconducting joint was done. The fabrication technique was researched by changing the parameters. The...
Nickel nanowires were successfully prepared on a large scale at room temperature through a simple and low cost liquid reduction method with the application of an external magnetic field of 0.3 T. The effect of uniform magnetic field on the morphology and properties of magnetic nickel was studied. The morphology, crystal structure, and static magnetic properties were measured by SEM, XRD, VSM, respectively...
Testing of Multi Phase High Power Permanent Magnet Synchronous Motor (PMSM) having multiple units is a difficult task. In this paper, prediction problems to obtain the overall characteristics for such motor under limited experimental conditions have been analyzed. A simplified testing model of the motor is established for testing of the overall characteristics and calculation methods were studied...
Epoxy resin insulation affects the stress distribution inside a superconducting coil. In this study, the effect of insulation was calculated by adopting an improved wire dynamic simulation method. A real Nb3Sn coil was used as an example. The strain distribution was obtained by calculating the motion of the wires and the forces applied on each wire. The strain distribution was compared with that obtained...
Economic operation of complicated distribution network is an important problem. A bilevel optimal operation model of complicated distribution networks with microgrids integration is built. In the model, the day-ahead optimal operation of complicated distribution networks is on the upper-level and the optimal operation of the microgrid is on the lower-level. Electricity exchange price constraints are...
In order to analysis the fluid-structure coupling acoustic properties of a designed piezoelectric micro-jet which is worked at slapping mode, the inside acoustic situation created by the vibration of vibrator is analyzed in this paper depend on the finite element software ANSYS Workbench. The effect of the properties of the liquid and shell to the ejection performance of the micro-jet is analyzed...
Rectangular hexahedron sonotrode has remarkable advantage as a platform to realize auxiliary ultrasonic vibration of workpiece with its abundant resonant frequency. However, the three-dimensional coupled vibration characteristics of rectangular hexahedron sonotrode is hard to meet the requirement of ultrasonic assisted micro forming process, which should be made structural optimization for improving...
Modular multilevel converter (MMC) has been a research hotspot in the past decade in the high-voltage high-power applications. The basic working principle is analyzed in depth in this paper firstly. A precise control law is deduced to control the output voltage and the circulating current directly and precisely. Different from the conventional control law, arm inductor voltages are considered in the...
The application of reduced common mode voltage pulse width modulation methods bring much high order harmonics to the variable speed drive system, which causes considerable iron loss inside the electric motor. In this paper, an improved iron loss model considering those high order harmonics is proposed. Iron loss coefficients are obtained based on experimental data by utilizing multiple linear regression...
In this paper, we present a robust line segment detection algorithm to efficiently detect the line segments from an input image. Firstly a parameter-free Canny operator, named as CannyPF, is proposed to robustly extract the edge map from an input image by adaptively setting the low and high thresholds for the traditional Canny operator. Secondly, both efficient edge linking and splitting techniques...
An accurate, repeatable and noninvasive measurement of kidney volume is an important but difficult task for nephrologists. This paper proposes a new kidney volumetry method by reconstructing the kidney surface from three-dimensional ultrasonography (3DUS) using statistical shape model (SSM). The measurement starts with picking sparse points on the kidney contour from 3DUS images. Then an accurate...
Superpixels are an oversegmentation of an image and popularly used as a preprocessing in many computer vision applications. Many state-of-the-art superpixel segmentation algorithms rely either on minimizing special energy functions or on clustering pixels in the effective distance space. While in this paper, we introduce a novel algorithm to produce superpixels based on the edge map by utilizing a...
In this paper, we propose a novel line segment detector, named as NETLines, which can produce a set of accurate line segments and a set of node-connected line-networks formed by connection of the line segments and the image boundary. Based on the line segments generated by other line segment detectors (e.g., EDLines [1]) on an edge map, the proposed algorithm efficiently makes use of the gradient...
In the traditional hydraulic actuation system, the temperature-change of the hydraulic oil was small in operation, however, the temperature-change of the hydraulic oil could be hundreds of degrees in EHA system. The wide temperature-change would affect the parameteres of the hydraulic oil and the efficiency of the pump. Therefore, the thermal-hydraulic model would not be applicable to the thermal...
With the profusion of the Linked Open Data, background knowledge base is playing an increasingly important role. For example, it can provide a basis for ontology alignment, but the background knowledge base is insufficient in metallic materials domain. However, a large amount of metallic materials knowledge exists in Yago, which can provide knowledge structure for background knowledge base. In this...
A reasonable unit restoration plan is pivotal for the restoration of a power system after blackout. In this paper, the units to be restored are divided into two types: network-layer units and plant-layer units. By analyzing their interactions between each other and the respective contributions to the system restoration, an optimization method of unit restoration based on NNIA for power system restoration...
Feature selection is a crucial step in the development of a system for identifying emotions in speech. Recently the interaction between features generated from the same audio source was rarely considered, which may produce redundant features and increase the computational costs. To solve this problem, emotional feature selection of speaker-independent speech based on correlation analysis and Fisher...
Fisheye image rectification and estimation of intrinsic parameters for real scenes have been addressed in the literature by using line information on the distorted images. In this paper, we propose an easily implemented fisheye image rectification algorithm with line constrains in the undistorted perspective image plane. A novel Multi-Label Energy Optimization (MLEO) method is adopted to merge short...
Airborne relaying is of potential to extend wireless sensor networks (WSN) to human-unfriendly terrains. Challenges arise due to lossy airborne channels and limited battery of unmanned aerial vehicles (UAVs). We propose an energy-efficient relaying scheme to overcome the challenges. A swarm of UAVs are deployed to listen to remote sensors from distributed locations, improving packet reception over...
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