bluuebunny/crossref_metadata_2025 huggingface dataset:
Two Dimensional Simulation of Electromagnetic Waves on Metal Materials Using the FDTD Method
Authors: Firdaus R A , Khoiro M , Dzulkiflih  , Rahayu V , Mutmainnah
Published: December 2022

It is challenging to picture the physical phenomenon known as electromagnetic wave simulation. The purpose of this work is to model the propagation of electromagnetic waves on a two-dimensional medium. FDTD is a method that is quite relevant to be used in visualizing electromagnetic waves. One can utilise Maxwell's equations to describe discrete electromagnetic waves having TM mode. The simulation is in the form of a Gaussian pulse with the magnetic field H and the electric field E having position and time domains, respectively. The proposed simulation conditions have considered the program's boundary conditions and numerical stability. The differential equation method methodology is used in the FDTD method. The simulation results show that the wave without PML is impeccably reflected, and with PML, the wave is reflected by the material utilized. Materials with high conductivity will make the waves decay and reduce their intensity. This research can be used in the investigation of materials and communication media innovation.
Improving Critical Thinking Skills (CTS) of Students Through Wave Energy Learning Project (WELP) on Environmental Physics Lecture
Authors: Satriawan M , Rosmiati R , Saputra O , Habibbulloh M
Published: December 2022

This study aims to encourage the critical thinking skills (CTS) of students through the Wave Energy Learning Project (WELP) program, which is applied with an early-assisted project-based learning model (EA-PjBL) in Environmental Physics lectures. The research focuses on the topic of the environment as a renewable energy source, especially ocean wave energy. In the WELP program, there is a prototype of ocean wave energy that has been developed as a teaching aid and an initial project model that pre-service physics teachers will develop. The data collection instrument used was a description test of the concept of ocean wave energy based on CTS, performance and product assessments, peer performance assessments, lecture observation sheets, and pre-service physics teachers’ perception sheets. The research subjects were 31 pre-service physics teachers in the sixth semester of the Physics Education study program at one of the academic staff education institutions in West Nusa Tenggara. The research data were analyzed using descriptive statistics, N-gain test, t-test, and effect size analysis. The data analysis results show a strong influence on the use of the WELP program through the EA-PjBL learning model on improving the CTS of pre-service physics teachers. The CTS of pre-service teachers has increased by category after attending lectures using the WELP program. This research implies that the WELP program developed can be a model for developing lecture programs on other renewable energy materials that enhance the development of higher-order thinking skills. The project in this research triggers the younger generation to contribute to overcoming the global electrical energy crisis.
Low-temperature heat transfer and stress analysis of LNG loading arm pipeline supports
Authors: Li Meng , Zhou Yi , Yu Bo , Shi Guang Zhi , Xia Hua Bo
Published: December 2022

The pipeline support is a complex component structure in liquefied natural gas (LNG) loading arm. In order to study the impact of ultra-low temperature conditions on the mechanical performance of pipeline brackets, the heat transfer analysis and thermal stress calculation of the pipeline support of the LNG loading arm are carried out under low-temperature conditions in this paper. Based on the principle of steady-state heat transfer, the finite element method is used to study the sensitivity of ambient temperature to heat transfer results of pipe support, the results show that the heat dissipated by the duct support is proportional to the temperature difference. The temperature field distribution of the pipe-bundle rib on the duct support under ice-free and ice-covered conditions is analyzed, and two different paths are selected to study the temperature distribution law of the structure, and the conclusion that the ice has the effect of cooling is drawn. Finally, based on the temperature field distribution results obtained by the heat transfer analysis, the low-temperature stress analysis of the pipe support is carried out. According to the thermal stress results, the corresponding improvement measures are proposed. It provides some guidance for the structural design of the loading arm.
Study on the Vibration Characteristics of the Spraying Needle Excited by Electro-hydraulic Source Based on Luminous Energy Method
Authors: Liu Jian-he , Yan Chen-yang
Published: December 2022

When one kind of liquid was atomized by a metal needle in the electric field, violent vibration of the spraying needle could be observed clearly, and the atomizing stability was affected by it seriously. To explore the cause of the needle’s vibration and weaken its negative effect, an optical energy method was adopted and some characteristics of the vibration were investigated. The principle of the optical energy method was very simple, it was just a transformation from mechanical information of the needle’s vibration to an optical signal composed with luminous energy features and received by a photodiode. The prototype of it was composed by a luminous source system and a testing circuit cored with MCU STC89C52. After the electronic signal transferred from the luminous energy was analysed, some characteristics come from different needles under different working conditions can be obtained. Some results are: the cause of the vibration comes from dual incentives of the electrostatic field and the atomized liquid jet, in view of mechanical structure, the length and diameter of the spraying needle was the main factors affecting the vibration amplitude and frequency, considering the flow rate flow through the spraying needle, there are different starting vibration voltages for different flow rate at the same length and diameter.
Orderly charging strategy for electric vehicles based on carrier wave communication
Authors: Lv Linjun , Zhang Zhaoyun , Jia Peiru
Published: December 2022

To solve the problem of the poor wireless signal in the use of charging piles in residential communities, this paper proposes a communication method using a power line carrier in the community charging system to achieve safe and reliable data communication. And the problem is that a large number of electric vehicles charging in a disorderly manner leads to an increase in the total peak load of the grid and affects the safe operation of the grid. In this paper, we propose to develop a suitable orderly charging plan to ensure the safe operation of the grid, with the least electricity price as the optimization target, and combined with V2G technology. The users are guided to charge during the valley period of electricity consumption, and when the grid operation load is too high, the grid operation pressure is linked by discharging electric vehicles to the grid. This strategy takes into account the security of the grid and the economy of the users, and to a certain extent, realizes the purpose of grid scheduling is to cut the peaks and fill the valleys, avoiding the sudden load change
Design of Electric Bicycle Charger Protection Device Based on Anti-Electrode Reverse Connection Technology
Authors: Qiu Xiaoyun , Li Xiaobai
Published: December 2022

According to studies, electric bicycles are used in large numbers in ancient villages as the main means of transportation. Electric bicycles are the primary source of fire risk in old villages, where the majority of houses are huge, fire-prone timber and brick constructions. In this paper, an electric fire safety device for electric bicycle chargers based on anti-electrode reversal technology is devised in order to avoid electrical fires produced by electric bicycle chargers. First, based on statistical data, the primary reasons why electric bicycle chargers catch fire are introduced. Then, the software design scheme of the system is built, and the architectural form of the electrical fire prevention device for electric bicycle chargers and related circuits is designed for the sources of fire. The created protection device can manage battery charging by observing the charging voltage to prevent the fire produced by thermal runaway of the battery as a result of overcharging. It can also protect the charger from burning caused by battery reversal during charging.
Optimization of MHz Wireless Power Transmission Distance Based on GaN Device
Authors: Ju Shengyun , Jiang Ying , Sun Hao
Published: December 2022

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Design of intelligent window opening system based on multi-sensor fusion
Authors: Zhou Wenhao , Huang Yong , Sun Xianbo , Yi Jingqiao , Gao Lin , Liang Shuxian , Ye Jiancong
Published: December 2022

The traditional electric window opener has the problems of low efficiency and single control mode. In view of the above shortcomings, an intelligent electric window opener control system based on multi-sensor fusion is designed. The system uses data acquisition, data processing, wireless communication, remote control, and other technologies to realize the real-time monitoring of environmental status through the fusion of temperature, light intensity, smoke, rain, and other sensors. When the monitoring data reaches the set value, the intelligent window opener will automatically open or close. The whole system is based on an STM32 single-chip microcomputer and uses the ESP8266 Internet of things module to realize the remote monitoring and control of the platform. In the aspect of window opening motor control, the proportional integral derivative (PID) is used to control the DC motor for the accurate window opening. The experimental results show that the overall operation of the system is stable, the response is rapid, the sensor accuracy is high, the system error is less than 5%, and the long-term operation shows good stability and reliability.
Inverse Kinematics Solution and Trajectory Planning of Redundant Manipulator Based on Improved Gradient Projection Method
Authors: Chang Shuai , Fu Yongling , Sun Jian , Hu Zixiang
Published: December 2022

With the rapid development of high-speed railways, the water injection way for the train is developing in the direction of full automation. To enable the water-carrying robot arm on the train to cope with various emergencies during the operation, it is necessary to keep the robot arm more flexible. In this paper, the improved gradient projection algorithm (IGPM) is combined with the rapidly expanding random tree algorithm (RRT), and the optimal goal is to maximize the manipulator’s degradation operability and obtain a path with the best fault tolerance under the continuous joint angle. Finally, with the 4R redundant manipulator serving as an example, the feasibility and superiority of the algorithm in this paper are compared and verified through the numerical simulation method.
The design and simulation of the actuator valve block of the integrated self-powered brake system
Authors: Qiao Weizhi , Gao Xiang , Lu Honglin , Mu Wenkan
Published: December 2022

In recent years, regenerative braking has been gradually proposed. Modular regenerative braking devices are installed near the wheel to recover the rotating kinetic energy when landing and convert it into hydraulic energy for braking. The core part of modular and integrated design is the actuator valve block. It is necessary to organically integrate all hydraulic components of an aircraft brake system, such as the on-off valve, hydraulic pump, motor, oil tank, accumulator, temperature and pressure sensor, one-way valve, relief valve, and oil filter. At the same time, it is very difficult to ensure high reliability, high strength, and a high power-weight ratio, and the temperature near the wheel is high, which can reach about 600°C when working. This is challenging for the design of the actuator valve block. In this paper, the integrated and modular brake actuator valve block is taken as the research object, and the actuator valve block is designed and developed using new technology, new structure, and new materials. Finally, the strength, stiffness, reliability, and weight of the actuator valve block meet the requirements of the brake system.
An Extended Configuration Design of High-Throughput Satellite
Authors: Tao Cheng , Zhang Lei , Wang Yihong , Hu JiaNing , Shan YingLei , Ma Kai , Han MingFen
Published: December 2022

The high-throughput satellite (HTS) adopts multi-spot beam technology, which enables the satellite design process to be featured by a large number of antenna horns, large-scale arrays, heavy support structures, and complex interfaces with the transponder. To solve the layout problem of complex payloads of high-throughput satellites, this paper proposes a configuration design scheme for the satellite expansion module. With the configuration design optimization of the high-throughput satellite payload module of the DFH-4E platform serving as an example, the mechanical analysis software PATRAN was used for modeling and mechanical analysis, and the configuration was optimized according to the analysis results. The optimization results show that the configuration design scheme of the expansion module is adopted to solve the layout requirements of high-throughput payloads effectively. The relevant indicators will meet the requirements of the system. And the design scheme is reasonable and feasible, which can provide a reference for the configuration design of high-throughput satellites.
A study on the Decommissioning and Renewal Strategy of Aged Equipment with Integrated System Risk Assessment and Benefit-cost Analysis
Authors: Niu Xin , Zhang Long , Li Xuyang
Published: December 2022

In response to the current problem of over-aged assets in large systems and relatively weak management of over-aged equipment in power companies, this paper uses Monte Carlo simulation to evaluate the annual risk loss cost due to the use of over-aged equipment. By establishing a gray G (1, 1) forecast model of operation and maintenance cost, the future operation and maintenance cost of over-aged equipment is found. Then, according to the benefit-cost analysis, the revenue gained by delaying the renewal of over-aged equipment is calculated. Finally, the net benefit function is constructed, and the optimal value is calculated to obtain the optimal retirement year. The article uses the proposed method to study the retirement of an aged line in a network, and the results show that the method can make full use of the value of the aged assets and maximize the benefits.
Design and Improvement of Digital Communication System Based on EDA Platform
Authors: Chen Wei
Published: December 2022

The design of digital circuit systems based on EDA tools can greatly improve design efficiency. In this paper, a multi-mode communication signal modulation and demodulation system are designed with FPGA as the hardware carrier. Furthermore, this paper puts forward a teaching and experimental scheme of communication circuits, that is, using the EDA platform to realize different modulation and demodulation modes. The advantage of this scheme is that it can not only be realized in hardware, but also can analyze the performance accurately and that the waveform is intuitive. This scheme can make students feel the advantages of EDA Technology in complex logic circuit design. Students can understand new communication modes deeply by using EDA technology.
Operational optimization of an integrated electricity-thermal energy system considering demand response under a stepped carbon trading mechanism
Authors: Wang Yongli , Qin Yumeng , Du Boxin , Liu Yiran , Xu Shenzhi , Li Da , Wang Dong
Published: December 2022

To further explore the potential role of the normal demand-side in reducing carbon emission reduction, we propose an operation optimization model for integrated power-thermal plants that considers demand response under a tiered carbon trading mechanism. First, carbon emissions from the microgrid are reduced by introducing a tiered carbon trading mechanism in the planning model. Finally, an optimal model for low-carbon operation of the integrated power system is developed using the sum of power purchase cost, carbon trading cost, and operation and maintenance cost as objective functions, and the effectiveness of the proposed model is tested using four typical scenarios. The results confirm the validity and effectiveness of the proposed model and serve as a reference for optimizing the operation of integrated power and heat systems under a tiered carbon trading mechanism, taking demand response into account.
Data Quality Evaluation of Photovoltaic Power Station based on Entropy Weight Method and Grey Comprehensive Evaluation Method
Authors: Xie Hongbin , Ma Xiaoguang , Zhao Junyong , Han Bitong , Shan Yu
Published: December 2022

The increasing necessity of renewable energy utilization has fueled the successful development of photovoltaic power generation technology. Distributed photovoltaic power stations have been rapidly promoted because of their small installed capacity and low initial investment costs. Scientific and comprehensive data evaluation of distributed PV is conducive to improving the operational efficiency of the power station. An index evaluation system is constructed for distributed power station data in each province. The entropy weighting method is used to determine the weights of different dimensions. Then, the data quality evaluation level is contrasted with the help of the gray evaluation method. Simulations of the proposed method were conducted. Finally, the results showed that the data of the tested distributed PV were at an excellent level, which verified the applicability of the method. In addition, the causes of data quality deficiencies are preliminarily explored.
Effect of Building Height on Wind Load Characteristics of Photovoltaic Arrays
Authors: Zheng Gensheng , Yao Jianfeng , Tu Zhibin , zhou Xing
Published: December 2022

The present study is carried out by FLUENT software, and the wind load characteristics of photovoltaic arrays installed on different building heights are analyzed. The analysis results show that the higher the building height, the larger the radius of the main vortex formed above the photovoltaic array. When H=0 m, the absolute value of the overturning moment coefficient of the photovoltaic array is much larger than those of the array installed on the roof, and it’s along the decreasing trend of the incoming flow. The shape coefficient of the photovoltaic array shows an obvious gradient change, and as the height of the building increases, the shape coefficient of the building also follows decreasing.
Energy Demand Forecast Analysis Based on Improved Grey Forecast Model
Authors: Hu Jiankun , Chen Zhijian
Published: December 2022

As China is on its way to achieving its carbon peaking and carbon neutrality goals, forecasting energy demand is increasingly important. Aiming at the problem of energy demand forecasting, this paper uses the logistic equation and Markov Model to improve the traditional Grey Forecast Model. And based on the data of China's total energy consumption from 2002 to 2021 as the original data, an improved grey prediction model was established. The validity of the prediction model in this paper is verified by the comparative analysis with the prediction results of the STIRPAT and LSTM prediction models. The results show that compared with the STIRPAT and LSTM prediction models, the predicted results of the improved Grey Forecast Model have smaller relative errors, more accurate prediction results, and better prediction performance.
Optimization of new comprehensive energy service system in industrial parks under the dual carbon target
Authors: Zhang Bo , Tang Liang , Dong Ranhao , Yang Junwei
Published: December 2022

Given the poor effect of the current new integrated energy management service, this paper puts forward the optimization strategy of the new integrated energy service system of industrial parks under the dual carbon goal, optimizes the functions of the new integrated energy service system in combination with the dual carbon goal, standardizes the monitoring data evaluation system of the new integrated energy, and constructs the new integrated energy consumption evaluation algorithm of industrial parks. Finally, it is confirmed by experiments. The optimization method of the new integrated energy service system of industrial parks under the dual carbon target proposed has high practicability.
Nanostructures of silicon anodes in Li-ion batteries
Authors: Du Yuxuan
Published: December 2022

As the application scenarios of lithium-ion batteries expand to many fields including electric vehicles and wearable devices, the energy density of current Li-ion batteries should be improved for satisfying the raising demand. In recent years, various methods have been gradually intensified, in which battery anode materials have received widespread attention. One of the most effective ways for improving battery performance is the use of silicon with different nanostructures, such as structures with different dimensions and different elemental doping, as the anode material, which can effectively improve the stability of solid electrolyte layers, enhance the number of reversible cycles and reversible capacity. This review summarizes the latest advances in silicon nanostructured anodes for lithium-ion batteries including nitrogen-doped carbon-caged silicon nanoparticles, silicon nanotubes made of layered CaSiO3, layered porous silicon encapsulated in carbon nanotube cages, silicon nanoparticles encapsulated in carbon-coated mesoporous silicon shells, and three-dimensional hierarchical porous structures. These nanostructures with excellent electrochemical properties can provide directions for the evolution of high-performance lithium-ion batteries.
Implementation of TCM grid-connected inverter based on STM32
Authors: Li Jian , Ren YiFeng
Published: December 2022

In this paper, STM32 is used to realize the control of TCM grid-connected inverter, which replaces the traditional control mode of digital logic controller and MCU combination, and simplifies the controller structure. A simple method for calculating the negative driving voltage of gallium nitride is presented. In this paper, the circuit parameters of each part of TCM inverter are designed, and the design scheme of each part of the circuit is given. Finally, a 200W prototype is built to verify the feasibility of the design scheme.
Research on the Demand Response Model for the Peak-Shaving Auxiliary Service Market Based on Large Users
Authors: Jiang Wenqian , Zhang Fan , Zhang Kun , Li Fusheng , Lin Xiuqing , Lin Xiaoming
Published: December 2022

The current electricity market reform has become a historical trend. Among them, large enterprises and users will face profound changes in the characteristics of the energy market and the industry's operating environment. Through the feasibility analysis of large users' participation in demand response and based on the potential of large users to participate in demand response, this paper establishes a bidding model for large users in the peak shaving market. Finally, in combination with specific parameter settings, a case analysis of large industrial users participating in peak shaving market transactions was carried out to verify the feasibility of the built model. At the same time, the large user quotation strategy for each time under the case was obtained and analyzed.