bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of MHz Wireless Power Transmission Distance Based on GaN Device
Authors: Ju Shengyun , Jiang Ying , Sun Hao 
Published: December 2022

Abstract
Aiming at the problems of low natural frequency and small transmission distance of traditional magnetically coupled resonant wireless power transfer systems, the GaN device is used as an inverter bridge to widen the natural frequency domain of the system, and the influence of the natural frequency and working frequency of the system on the transmission distance is studied in the high-frequency range. The natural frequency of the system is taken as a variable parameter from the perspective of the equivalent circuit, and together with the working frequency and transmission distance, it is used as the influencing factor affecting the output power of the wireless power transmission system. The expression of the system-normalized transmission power is obtained, and the relationship between the transmission distance and other parameters is analyzed. Finally, a complete set of a series-series wireless power transfer system based on GaN devices is designed. The results are promising and in agreement with theoretical analysis, verifying that under the system detuning coefficient of 0, the transmission distance corresponding to the maximum transmission power of the system will increase with the increase in the natural frequency of the system.
Laser Induced Single Event Upset (SEU) Testing of Commercial Memory Devices with Embedded Error Correction Codes (ECC)
Authors: Han Yang , Liu Yurong , Lei Zhifeng , Zhang Zhangang , He Yujuan 
Published: December 2022

Abstract
Results of laser-induced single event upset testing of devices with embedded error correction codes are described. Specifically, the memory system, consisting of a Micron MT41K256M16TW-107 IT: P 32 Meg×16×8 banks Dual Dynamic Random Access Memories (DDRs) was tested on a self-made test board. Two samples of each memory system or device type were irradiated with a pulsed laser. The units were irradiated by using a continual read/write correct loop in several bit patterns. Results for both correctable and uncorrectable errors are presented along with soft error data records.
Design and Numerical Simulation of High Performance Heat Dissipation Axial Flow Fan
Authors: Zhang Shengli , Ma Xiaofei , Sun Yupei , Xiao Chunsheng , Wang Changhao 
Published: December 2022

Abstract
The airfoil used in axial fan blades is one of the important factors that affect the efficiency of the axial fan. In this paper, the design process of the axial flow fan is realized by FORTRAN language, and then the traditional airfoil CAP2021 and the new high-performance airfoil CAP2021-Mod designed by us are applied to the design of the axial flow fan, and the impellers of two axial flow fans are designed, and the design results are compared and analyzed. Finally, the CFD numerical simulation of the two axial flow fans is carried out, and the Aerodynamic performance and flow field characteristics of the two fans are obtained. The simulation results show that the axial flow fan with a high-performance airfoil has better Aerodynamic performance, and it is verified that the high-performance airfoil can be used in the design of a high-performance axial flow fan.
Design and Analysis of LPDA Fed Parabolic Reflector Antenna
Authors: Zhang Yangyang , Liu Xingfu , Liu Huijie 
Published: December 2022

Abstract
In this research, a parabolic reflector antenna fed by a log-periodic dipole array (LPDA) was designed for the broadband requirement in the space very long baseline interferometry (SVLBI) project. Geometric parameters for LPDA and reflector were calculated and selected based on the major performance indicators, then the simulation and results were obtained in the software ANSYS Electronics 2021. The realized antenna gain exceeded the engineering requirement of 15 dB, and related issues were also studied and analyzed.
An improved LED junction temperature test method based on FCM
Authors: Zhang Jie , Zhang Junchao , Xu Bingshe , Fu Qiang , Wang Chen , Zhao Haodi 
Published: December 2022

Abstract
High junction temperature (Tj) of LED will affect the performance and life of LED, so this paper proposes a high-power LED junction temperature test method. Mainly aiming at the problem that the accuracy of the forward current method (FCM) will be affected by the calibration procedure, equipment aging, and technical differences when batch testing LED Tj, this paper uses the relationship between relative current and Tj to calibrate the procedure based on this method, to limit the negative affection of sample heterogeneity. Ten LED samples were tested in the experiment, and the Tj errors under two test methods were obtained. The results showed that the improved method was more accurate than the traditional method. Then, the Tj error of the improved method was compared with that of the forward voltage method, and the error of the new method was smaller.
Demagnetization Fault Diagnosis of Permanent Magnet Synchronous Motor Based on Empirical Mode Decomposition
Authors: Zhang Meng , Yu YinQuan 
Published: December 2022

Abstract
The demagnetization failure of the permanent magnet synchronous motor (PMSM) will be accompanied by a magnetic leakage phenomenon. The degree of magnetic leakage will affect the utilization of the permanent magnet. If the magnetic leakage is serious, the motor can not run normally. To study the problem of the demagnetization fault degree of PMSM when partial demagnetization fault occurs, this paper employs the finite element method to simulate the radial magnetic leakage signal 1cm outside the 8-pole 48-slot surface-mounted PMSM. The amplitude of the harmonic wave of the radial magnetic leakage signal is analyzed when partial demagnetization occurs in the permanent magnet synchronous motor. The results show that the spatial order amplitude of the motor radial flux leakage signal decreases along with the increase of demagnetization, which can be used as a check for the demagnetization degree of the motor.
PMSM Demagnetization Fault Diagnosis Based on Back-EMF Signal
Authors: Nian Fule , Yu Yinquan 
Published: December 2022

Abstract
To study the irreversible demagnetization fault of the permanent magnets (PMs) in the permanent magnet synchronous motor (PMSM), a two-dimensional Finite Element (FE) model of the PMSM is built by the Finite Element Method (FEM). Analysis of demagnetization faulty mechanism of the electric and magnetic signals under local demagnetization conditions is conducted. The no-load Back-EMF signal is adopted as the indicator of the demagnetization faults of PMSM. In this paper, the faults of uniform demagnetization and single magnet demagnetization are studied through FEA. Therefore, the relationship between the amplitude of the back EMF and the degree of demagnetization is obtained. Moreover, the fitting curve is obtained by using the least squares method from multiple sets of FEA results. The results show that the method can effectively diagnose the demagnetization fault of the PMs of the PMSM, and could provide the guideline for online health monitoring of the PMSM in future research works.
Research on Line Loss Prediction Method Based on Improved DBN Model
Authors: Ma Yunlong , Fang Lei , Wang Liming , Ni Chao 
Published: December 2022

Abstract
The line loss rate is an important indicator for measuring the technical and non-technical losses in the distribution process. This paper proposes a prediction method for power distribution networks based on an improved Deep Belief Network (DBN) model and deep learning for line loss prediction in medium and low-voltage courts. Considering that the line loss data is time series data, this paper proposes the Cycle_DBN_A model. In the model’s training process, the greedy algorithm performs unsupervised pre-training layer by layer on the network layer in the model. Then the Adam optimizer is used to perform supervised global fine-tuning on the Cycle_DBN_A model. Test sets are to verify the algorithm. The Cycle_DBN_A model is superior to other models as it has a Mean Relative Error (MRE) of 2.0662% and is also the best in multi-data verification.
Adaptive Control for Joint Module of Bionic Arms
Authors: Guo Yuting , Li Baojiang , Wang Haiyan , Bai Jibo 
Published: December 2022

Abstract
Minimizing the influence of unknown external disturbances while satisfying complex control requirements in daily life is one of the difficulties of bionic arm control. However, the control of modular joints often ignores the dynamic characteristics and coupling relationship of the system, which can not meet the control requirements of a bionic arm prosthesis. In addition, the large vibration caused by unknown interference is not conducive to human-computer interaction. In order to solve this problem, we proposed an adaptive feedback control (AFC) method based on magnetic field-oriented control for the joint module to realize intelligent control of the bionic arm. The disturbance of the joint module is obtained by real-time parameter calculation. At the same time, the controller regulated the output voltage to eliminate the influence of uncertain disturbances. Theoretical analysis and simulation results show that the controller has a good effect on improving the dynamic performance of the joint module system, and maintaining the stability of the system in the interference, satisfying the requirements of bionic arm control.
Smart Micro-grid Functional Features and Planning Indicators Evaluation
Authors: Duan Junhong , Yuan Xiaoyan , Bao Chengjia , Wang Jian , Wei Kai , Ma Xiping , Li Yaxin 
Published: December 2022

Abstract
This paper focuses on the comprehensive perspective of society and analyses the operating costs and income of microgrids in the balanced power network mode in order to comprehensively evaluate the economy of microgrids. It is critical for the rational planning of the micro-grid and developing a scientific evaluation indicator is an effective way to test the rational test. Research on the functional characteristics, evaluation standards, evaluation indicators, and economics of microgrids, we analyze the functional characteristics and the cost benefits of micro-grid. Meanwhile, we also establish an evaluation indicator feature library model, and build a data model of regional weather wind, light, and water power generation, simulating production. The indicator strategy and complete process will establish a solution assessment method based on the indicator space distance from a multi-dimensional space angle. Verify the effectiveness of this method through an example of an independent microgrid for the island.
Efficiency Analysis of Phase Shift LLC Resonant Converter
Authors: Lu Zhiqi , Fang Ziwen , Huang Jun , He Xiaobin 
Published: December 2022

Abstract
Compared with pulse frequency modulation, a phase-shift modulated LLC resonant converter has a wider voltage modulation range and better EMI characteristics, but the efficiency is relatively lower. In this paper, the working process and power loss characteristics of PSM LLC are analyzed, the efficiency optimization method of PSM LLC is proposed, and the relevant conclusions are verified by simulation.
Research on Three Cylinder Synchronous Control Based on Tracking Differentiator and Fuzzy PID
Authors: Xu Cong , Wang Xin , Xin Shaojiie 
Published: December 2022

Abstract
Aiming at the problem of three-cylinder asynchronous caused by nonlinear factors in the three-cylinder synchronous control system, a fuzzy PID synchronous control method with a tracking differentiator based on an adjacent cross-coupling control strategy is proposed. Fuzzy PID control is used to adjust P, I, and D parameters online, and the tracking differentiator is used in fuzzy control to filter the input error and error differential of fuzzy control. After the controller design is completed, the combined simulation model of the three-cylinder control system is built by AMESim and Simulink. The simulation results verify that the performance of the fuzzy PID controller with tracking differentiator is smaller than the maximum synchronization and average error of the ordinary PID, which can be better applied to the three-cylinder synchronous control system.
Research on Elevator Operation Harmonic Current Characteristics Analysis and Electrical Fire Detection Technology
Authors: Qiu Xiaoyun , Li Xiaobai 
Published: December 2022

Abstract
The elevator will generate high-frequency harmonic current during operation, and the leakage current generated by the high-frequency harmonic current to ground will cause interference to the residual current type electrical fire monitoring detector due to the existence of parasitic capacitance in the distribution line. This paper analyzes the high-frequency interference signals generated during the operation of elevators and studies the residual current analysis method based on digital filtering technology. Firstly, the causes of false alarms generated by residual current type electrical fire monitoring detectors are analyzed according to the residual current interference signals generated during elevator start-up. Then, the frequency characteristics of the disturbance signal of the elevator in different operating states are proposed by analyzing the spectrum of the disturbance signal during the stationary, ascending, and descending processes of the elevator. Finally, the method of using a fast Fourier transform to analyze the residual current in elevator distribution lines is presented. The experimental results show that the frequency of the residual current interference signal generated when the elevator is running is mainly distributed above 3000 Hz, the energy of the interference signal at 3700 Hz is the largest when the elevator is stationary, and the energy of the interference signal at 4500 Hz is the largest when the elevator is ascending or descending. The amplitude of the signal can be used as a criterion for whether the distribution line generates leakage.
Research on Harmonic Diagnosis Technology and Device Development of Coal Mine Electrical Equipment
Authors: Li Zhongkui , Wu Wenzhen , Zhang Ziliang , Hua Dong 
Published: December 2022

Abstract
In view of the time-varying harmonic problem existing in the coal mine, two methods of segmented FFT transform and wavelet packet transform are used to detect the time-varying harmonic. Based on the research on the power quality index and harmonic generation mechanism of the key power supply equipment of the underground branch power grid in the coal mine, combined with the actual production of the coal mine, a practical and effective power quality detection method is proposed, and an intelligent diagnosis system for the health status of the power supply equipment in the coal mine is developed. Through the real-time monitoring of the harmonic parameters of the power grid, the operating parameters of the power grid, and through the comprehensive analysis and judgment of the working status of the equipment of the underground power grid, the system can achieve the comprehensive judgment of the fault of the key equipment of the underground branch power grid and achieve the purpose of fault location and early warning.
Design and Implementation of Multi-output Flyback Switch Power Supply
Authors: Wang Qianqiu , Yang Bin , Li Junjie , Ye Xiaoying 
Published: December 2022

Abstract
The switching power supply with flyback topology type has the advantages of easy design, lightweight, and high efficiency, and it is widely used in occasions with low power and multiple outputs. In order to solve the problems of low efficiency and low output precision of switching power supply in the current market, this paper proposes an improved 90~264Vac to +5V, +15V, -15V three-way output flyback with a power of 43.5W. The experimental test results show that the proposed switching power supply has the advantages of strong anti-interference, strong robustness, high efficiency, and low cost, and it can be widely used in various electronic devices.
Design and research of stripping tool for live-fired cable based on the distribution network
Authors: Shan Xiaofeng , Guo Xiang , Han Xianguo , Tang Xuming 
Published: December 2022

Abstract
High-voltage live cables are often required to be live-fired in the transformation and maintenance of power grids. The traditional live fire connection operation is mainly manual fire connection, which has great potential safety hazards, the fire connection efficiency is low, and the fire connection quality is uneven. This paper designs and develops a peeling tool based on a 10kV live fire connection operation. In view of the problems of low fire connection efficiency and uneven connection quality of traditional live fire connection tools, hierarchical operation, intelligent control, and instantaneous dynamics simulation based on Anasys Workbench are adopted. The design and development of peeling tools are based on 10kV live connection work. Test experiments show that the live cable stripping tool can realize the live cable stripping operation of 10kV cables and has the characteristics of a high degree of automation and stable fire connection quality.
Sensitivity Enhanced Touch-mode Capacitive Pressure Sensor with Double-cavity
Authors: Fu Yingchun , He Fan , Guo Wei , Qu Xichun , Duan Zhiyong , Hu Mengwen , Ma Liuhong 
Published: December 2022

Abstract
Capacitive pressure sensors that consume less power with less temperature sensitivity have undergone many design modifications, in order to improve the performance for meeting the application needs of various fields. In this paper, the sensitivity of micro-pressure capacitive sensor is improved by adding a novel double-cavity structure and a gas hole. The double-cavity feature can amplify the amplitude of the upper diaphragm, and the gas hole can alleviate the repulsive effect of the gas pressure in the chamber on the diaphragm bending deflection. This paper provides an in-depth theoretical analysis model for the designed sensor structure using Finite Element Method Simulations. The simulated results indicate a significant enhancement in linearity range and capacitance in comparison with traditional structure. Besides, the sensor shows an enhanced sensitivity of about 1.83 times when the volume ratio of the upper cavity to the lower is 4:1, compared to the sensor having two cavities with the same volume. It is expected to realize the micro-pressure detection technology, which integrates the characteristics of high sensitivity, large linearity range, and anti-overload technology.
The Reuse method of the Part CNC process based on 3D feature matching
Authors: Zeng Fenfang , Fan Hu , Li Huanqing , Wang huachang 
Published: December 2022

Abstract
Aiming at the problem of efficient reuse of existing parts CNC process, this paper presents a reuse method of the part CNC process based on 3D feature matching. It’s assumed the part which is the most similar to the 3D features of the new part has been found in the CNC history library. To reuse the CNC process of the existing part, the CNC programs and machining parameters of the existing part are imported into the new part as the machining template firstly, then the improved 3D polar radius surface moments are used to extract the 3D shape and position vectors of the machining area of each CNC program of the existed part and each face of the new part, finally the weighted Euclidean distance is used as a metric to find the most similar matching of each machining area in the new part, and the matching result is optimized by the greedy algorithm based fragmented surface matching algorithm and the overall optimization algorithm. Hundreds of sets of 3D feature similar parts were verified in the prototype system based on this method. The results show that this method can effectively reuse the existing CNC parts, and significantly improve the efficiency of CNC programming.
Research on the Torsional Vibration Response Characteristics of Parallel Operation Steam Turbine Generator Unit Shafting
Authors: Tang Guangyao , Li Luping , Liu Rui , Ouyang Minnan , Xiang Moyu , Yang Changxing 
Published: December 2022

Abstract
With the continuous increase of unit capacity and the widespread application of series compensation devices in power transmission systems, the risk of coupling oscillation between units and power grids and between units has increased significantly, which seriously endangers the safe operation of units and power grids. In this paper, the torsional vibration response of each unit after grid failure is calculated by establishing a lumped mass model of the shafting torsional vibration of the parallel unit. The effects of fault type, series compensation degree and fault location on the torsional vibration of parallel unit shafting are studied. The results show that the three-phase short-circuit fault in the grid has a greater impact on the unit; the influence of series compensation degree on the torsional vibration of the shaft system decreases first and then increases; when the transmission line fails, it will produce a certain torsional vibration excitation effect on the shafting of all units; when a short-circuit fault occurs at the outlet of a generator, the torsional vibration excitation of the unit is the largest, but it will also produce a certain degree of torsional vibration excitation to other units in the same network.
Study on the application of wavelet threshold denoising in the detection of coal spectra by LIBS
Authors: Wang Shouya , Meng Deshuo , Zhang Ke 
Published: December 2022

Abstract
Laser-induced breakdown spectroscopy (LIBS) is a fast spectral detection technology, which has been widely used in coal composition detection and soil pollution detection in recent years. In the process of detection, due to various reasons, the spectrum obtained is mixed with noise, which has a negative impact on the accuracy of subsequent analysis. In this paper, taking the detection of coal by LIBS spectrum as an example, wavelet threshold denoising is used to denoise the detection spectrum containing noise. Different threshold methods are used to compare the denoising effects through simulation, so as to make full preparations for further accurate analysis of the spectrum.
Analysis of the Impact of Circular Contour Error Based on CNC Machine
Authors: Zhang Qiujie , Shen Huiming 
Published: December 2022

Abstract
To improve the processing accuracy of the CNC machine, the errors caused by uneven pitch spacing between the servo feeding axes of the NC machine are analyzed. With the combination of the principle of plane circular contour motion track synthesis, the influence of the pitch errors produced by the X and Y axes on the circular contour errors is analyzed. Finally, the experimental platform is adopted to analyze the data before and after screw pitch error compensation with a spherical rod. The results verify that the screw pitch errors impact the outline errors, and the proportion of mismatch errors was reduced by 96.88% after screw pitch errors compensation.
Coordinate Extraction of Measuring Points for Sensing Optical Fibers on Wafer Surface
Authors: Zhang Qingfa , Zhu Pingyu 
Published: December 2022

Abstract
In order to solve the problem of difficulty in extracting the coordinates of actual measuring points in the detection of precision components by distributed sensing optical fiber, a method of extracting the coordinates of optical fiber measuring points based on machine vision is proposed. Firstly, a strip light source should be applied to side lighting to avoid the specular reflection of the wafer. Take pictures from four directions of 0°, 45°, 90°, and 135°, and then superimpose them into a completely original image. And this image is preprocessed by image contrast enhancement and bilateral filtering. Secondly, the Canny algorithm is adopted for sub-pixel edge recognition of optical fiber images. The optical fiber is extracted segment by segment by using the Gaussian line detection method and obtaining the full optical fiber path. Finally, the coordinates of the measuring points along the sensing optical fibers can be determined under different spatial resolutions of the distributed optical fiber system.