bluuebunny/crossref_metadata_2025 huggingface dataset:
Detection of Back Attack based on Interval Temporal Logic
Authors: Zhang Juan , Gu Fenfei
Published: June 2020

Contrasted with other detection methods, based on temporal logic the intrusion detection method can deal with complex network attacks actively. However, due to the lack of network attacks temporal logic formula, common back attack cannot use the above methods of detection. Therefore, the Propositional Interval Temporal Logic (ITL) is used to establish temporal logic formulas for back attack. Firstly, the attack principle of back attack was analyzed. Secondly, the critical steps of the attack were break up into atomic actions and the atomic proposition was defined. Finally, the temporal logic formula for the attack was established based on the logical relationship between the atomic propositions. According to the principle of model checking, the obtained temporal logic formula can be used as the input for the model checker (intrusion detector). The automaton was utilized to model the log library as another input to the model checker. And the intrusion detection method for these three attacks was given. and it proved the validityof the novel method by some Simulation experiments
Research on the Handoff for Urban Rail Transit Based on IGM-BP Algorithm
Authors: Wei Wei , Liu Xiaojuan , Li Yao
Published: June 2020

Aiming at the problem that the reference signal received power (RSRP) value received by the urban rail transit train during the handoff fluctuates greatly, which causes frequent occurrence of ping-pong handoff, combined with the A3 event in the TD-LTE standard, the improved grey prediction-BP neural network (IGM-BP) algorithm was proposed to improve RSRP fluctuations. The terminal access unit (TAU) will receive the first four sets of RSRP values at time t to establish a grey model GM (1,1) and get a set of predicted values. Take the average of the predicted value as the expected value, and finally the predicted values, modified by the BP neural network algorithm, are used to obtain the expected RSRP value. The simulation results show that the proposed algorithm, compared with the traditional handoff algorithm and the grey prediction algorithm, decreases the RSRP value fluctuation range, reduces the ping-pong handoff rate and meets the requirement that the TD-LTE system handoff success rate reaches 99.5%.
Research on the Construction of Knowledge Service Model of Port Supply Chain Enterprise in Big Data Environment
Authors: Bo Yang , Junqing Mao
Published: June 2020

In the context of the rapid development of big data and artificial intelligence, with the help of the knowledge service theory system and big data technology to build a smart port supply chain knowledge service model to provide a personalized, intelligent, and diversified knowledge-based service system platform solution to port supply chain enterprises, which is of great significance to realization of port supply chain transformation and upgrading and intelligent integrated operation. This paper analyzes and summarizes the research status of knowledge service demand and port supply chain knowledge service during the development and operation of port supply chain, and applies big data and artificial intelligence technologies such as knowledge matching, knowledge fusion, and natural language processing. The port supply chain knowledge service model including knowledge acquisition, knowledge organization and knowledge service modules is constructed. Ontology method is used to construct the ontology knowledge base of port supply chain, and based on this, computational reasoning experiments are performed. The experiments show that the ontology technology shows good effectiveness and superiority in constructing the knowledge service system model of the port supply chain in terms of knowledge representation and knowledge reasoning.
Study on involute rotor profile based on pressure angle reduction
Authors: Liu Linlin , Chen Peijun , Du Jinqiao , Wang Xinyi
Published: June 2020

By adopting the method of reducing the pressure angle, this paper carried out an improvement on the profile of traditional involute rotor. It’s whole tooth profile is described exactly by combining the meshing principle of gears with parameter equation. The study made clear that there were drops to some extent on the area utilization coefficient of the improved profile of involute rotor when compared with the traditional profile of the same structure, yet its coincident degree was increased along with the decreased of pressure angle. It raised the stability of rotor transmission and in the mean time raised the bearing capacity of rotor transmission.
Experimental research on efficient irrigation system with mixed fertilizer in integration of water and fertilizer
Authors: Ren Longlong , Zhang Hongmei , Zhang Shuai , Fan Guiju , Li Yang , Song Yuepeng
Published: June 2020

China is a country with relatively insufficient water resources. Saving water and fertilizer and improving the utilization of water and fertilizer have become one of the most urgent problems in fruit industry. Water and fertilizer integrated irrigation technology is one of the means to solve the above problems. In this paper, a new efficient mixed fertilizer irrigation system is developed and field experiments are carried out. With Box-Behnken experimental design method, a quadratic regression model indexed by undissolved amount of three fertilizers is established. Through the interaction of the model and the analysis of response surface, the influence of stirring speed, stirring time and submerged depth of stirrer on response index is obtained. These work may provide some idea when engineers design this kind of system.
Analysis of error probability in aero ordnance maintenance
Authors: Wang Xifeng , Hu Junhua , Liu An
Published: June 2020

Aero ordnance maintenance is a very important part in aviation maintenance, which has such characteristics as elusive, inconvertibility and danger. The specificity of aero ordnance maintenance is analyzed, and the error model fitting well with the actual situation is built. The maintenance error probabilities are calculated by Bayesian network. Besides, the influences of organization management, professional skill and other typical factors are analyzed in this paper. The related results have some reference and guiding meaning to the aero maintenance work.
Study on developing application fields of micro differential pressure sensor with magnetic fluid
Authors: Hao Ruican , Liu Huagang , Xing Feifei , Ma Jinru
Published: June 2020

Magnetic fluid is a new novel nano magnetic material which could be applied in many engineering fields. Micro differential pressure sensor is a potential application field for measuring technology. Magnetic fluid is introduced. The potential engineering application fields are explored and researched, which includes industrial boiler, converter in steelmaking furnace, measuring the weight of solid, the distribution of pressure field, air volume, respirator, mine passage, warehouses, bioengineering, textile workshop, predicting leakage of container, fluid throttle, medical devices, and so on. Sensors with magnetic fluid could certainly create a new way for engineering application.
Research on the Performance of Accumulators Driven by an Electronically Controlled Hydraulic Vehicle
Authors: Zhu Xiaoji , Wang Qiang , He Xiaohui , Du Qiangmao , Sha Yigang
Published: June 2020

In order to study the performance of an accumulator during the start up of an electronically controlled hydraulic vehicle, theoretical analysis and establishment of a 1/4 vehicle experimental platform for experimental verification were conducted, in order to study the performance characteristics of the hydraulic circuit during driving. Control experiments show that the accumulator does not affect the acceleration performance and the torque of the hydraulic motor when an electrically controlled hydraulic vehicle is driven. The accumulator can be used as an auxiliary power component to absorb partially wasted energy during driving to improve the energy utilization efficiency. The energy absorbed by the accumulator during driving can increase the maximum speed; the use of the accumulator can alleviate the hydraulic shock at the entrance of the hydraulic motor.
Design and on-orbit test of RBF network friction compensation sliding mode control algorithm for Luojia1-01 satellite attitude
Authors: Qu Zhi , Xu Kai , He Xin , Chen Zhigang , Li Feng , Liu Mengmeng , Xie Yanhao
Published: June 2020

Aiming at the attitude maneuver mode of Luojia1-01 satellite attitude control system, this paper designs an RBF network friction compensation sliding mode control (SMC) algorithm. Firstly, the satellite attitude motion model is derived according to the needs of the imaging working mode. Secondly, a fast Terminal sliding mode control law is designed based on the tracking error motion model described by the error quaternion. Considering the suppression of disturbance, an extended state observer (ESO) is introduced to observe the total disturbance of the system. Then, the RBF network friction compensation system is used to approximate the switching term on line and further reduce the vibration, thereby reducing the switching gain in the sliding mode control law. The simulation results of RBF adaptive control algorithm and RBF network friction compensation sliding mode control algorithm are carried out to prove the perfect effect of the proposed algorithm. Finally, the on-orbit test and summary of Luojia1-01 satellite attitude control system are carried out. The results show that the attitude pointing accuracy is better than 0.02°, the attitude control stability is better than 0.005°/s, and the accuracy of control moment is 0.01mNm. This method satisfies the overall requirements of Luojia1-01 satellite’s working mode.
Analysis of Turning Process of Slim Shaft Based on Finite Element Method
Authors: Wu Mingming , Zhou Tao
Published: June 2020

Based on the analysis of turning bending deformation of the ordinary turning (forward) machining method of the slender shaft, a reverse turning machining method of the slender shaft is proposed, the bending deformation analysis of the reverse turning of the slender shaft is performed, the finite element method is used. The machining accuracy of the two turning solutions is simulated respectively. Finally, it is verified through experiments that reverse turning can improve the turning accuracy of slender shaft parts to a certain extent.
Control of Permanent Magnet Synchronous Motor Based on Active Disturbance Rejection Control
Authors: Tian Xin , Xiong Hejin , Lei Deming
Published: June 2020

For the control of permanent magnet synchronous motors, the proportional integral controller has the characteristics of simple structure and strong versatility, and has been widely used. However, in some occasions with the higher requirements for anti-interference, the proportional integral controller cannot fully meet the control requirements. Therefore, it is proposed to apply active disturbance rejection controller to control permanent magnet synchronous motors to achieve the purpose of improving the control performance of the system. The models of the proportional-integral controller and active disturbance rejection controller were built using MATLAB, and compared with each other under the premise of ensuring that both parameters were optimal. The situation proves that the permanent magnet synchronous motor with applying active disturbance rejection controller has better anti-interference performance in the interference environment.
A Magnetic Distance Measuring System For Drilling Multiple Vertical Wells Simultaneously
Authors: Ding Xudong , Gao Xu
Published: June 2020

With the increasing demand of oil, gas and mineral exploration and development and the development of logging technology, when drilling two or more wells, people need to carry out accurate measurement and positioning. a magnetic distance measurement system diagram for drilling multiple wells simultaneously. This paper presents a magnetic distance measuring system for drilling multiple vertical wells simultaneously. According to the magnetic field data, the geometric relationship between the two BHAS is determined, and the distance and orientation between wells are automatically located to maintain a predetermined geometric relationship, and then simultaneous drilling is realized. The algorithm is simple, the error is within the acceptable range, and it can further improve the efficiency of drilling operation, save time and reduce cost.
Two-step Calibration Method for Triaxial Magnetometers
Authors: Wang Xianran , Wang Anju , Wang Weilin , Qin Yijie , Ge Xu , Yao Chang , Ouyang Jun
Published: June 2020

In this paper, two important sources of the non-orthogonal errors of triaxial magnetometers were analysed. The non-orthogonal error mainly come from the transverse sensitivity of uniaxial sensor or non-orthogonality between the three axes of magnetic magnetometer. These two error sources were separated by mathematical analysis. Then a two-step calibration method of triaxial magnetometers was designed. It showed that the peak-to-peak value of the calculated result of the scalar of magnetic field could be reduced to 56nT from 350nT within the range of 50000nT.
Research on the detection of high-speed current transformer core corrosion based on LabVIEW
Authors: Fan Guangen , Li De-cang , Yue Qiang , Zhang Yatong
Published: June 2020

Aiming at the corrosion degree of current transformer cores in high-speed EMUs, a corrosion detection system of current transformer cores in high-speed EMUs is developed by using LabView as a development tool and combining with wireless transmission technology based on TCP/IP remote communication. The system includes two subsystems: vehicle unit and vehicle unit. It realizes signal acquisition, data processing, parameter display of rust determination, real-time wireless transmission of data, parameter preservation and alarm prompt. It also realizes portable and portable data acquisition requirements combined with relevant hardware equipment. The test results show that the system can meet the requirement of iron core corrosion detection of current transformer in high-speed EMU, and the hardware equipment adopted make the system more convenient to use and meet the practical application requirements. It has a certain reference value for the construction of automatic fault detection system for high-speed EMU.
Design of Health Care for Elderly Living Alone Based on ZigBee
Authors: Weichao Cai , Xianhui Wang
Published: June 2020

Now the society has stepped into the aging stage, because of the rapid pace of life in cities and hollowing out of villages, a considerable number of older adults living alone. The health of the older adults living alone becomes a concern for their children. The aim of this study is to provide a health monitoring program that does not interfere with the life of the elderly. Research data show that the biggest threat to the health of the elderly is falls and cardiovascular attacks. The design uses wireless wearable technology to monitor the motion status and ECG signals of the elderly. PC is used as data storage and transmission center and has the ability of simple data processing. The experimental results show that the design can transmit the acceleration signal and ECG signal to the personal computer through wireless mode, and the processed data can meet the needs of professional medical staff.
A LabView-based Smart Aquaculture system
Authors: Shufen Huang , Wei Cheng , Shuiyin Xu
Published: June 2020

To facilitate aquaculture farmers’ management of fish ponds and realize automatic detection and real-time response of water quality, we developed a LabVIEW-based smart aquaculture system. This system uses applications developed on the LabVIEW platform as the control centre, and uses the NI USB-6001 data collection card to collect parameters like dissolved oxygen, pH scale, water level from sensors, and displays and releases warnings on the monitoring warning interface. When the parameters of dissolved oxygen (DO), pH scale and water temperature fall below the standard values, the system will automatically start the oxygen generator, the pump and the heater to realize automatic control.
Finite Element Analysis and Topology Optimization Design of Seat Bracket for New Energy Bus
Authors: Zhang Enguang , Wang Li
Published: June 2020

This paper used NX8.0 to carry out the finite element analysis and topology optimization design of the electric bus seat bracket and the mechanical properties before and after optimization are compared. The results show that when the volume is reduced by 8.9%, the maximum deformation is reduced by 47.8%, the maximum stress is reduced by 66%, the average deformation is reduced by 50%, and the average stress is reduced by 54%. In this process, light weight is achieved, and the mechanical properties of the product are improved significantly. All processes are completed under the same software, which ensures the data consistency and editability. As the case involves new energy vehicles, parametric design, finite element analysis and topology optimization design, it is introduced into the CAE course as a project case under the background of “new engineering” and achieves good results.
Nonlinear Robust Control of a Stewart Parallel Robot
Authors: Chen Liang , Sun Hanxu , Jia Qingxuan , Yu Tao , Zhao Wei
Published: June 2020

In this paper, the control problem of a Stewart parallel robot is investigated, and a sliding mode control method based on self-tuning sliding mode disturbance compensator and double power reaching law is presented. The presented control method can realize fast regulation of a Stewart parallel robot system, and has good robustness and adaptability towards the system uncertainties. The design of a self-tuning sliding mode disturbance compensator is included in the presented control method. The designed sliding mode disturbance compensator does not need the upper bound information of the system uncertainties, and can accurately estimate the system uncertainties. The double power reaching law can not only ensure fast convergence of the system states, but also maintain the continuity of the sliding mode controller. Lyapunov stability theory is adopted to prove the stability of the closed-loop control system, and the validity of the presented control method is verified by a numerical simulation test.
Design and implementation of infrared lamp automatic screening system
Authors: Ge Zheyang , Dong Hao , Wen Jing , Zhang Xi , Wang Qingyu
Published: June 2020

To improve the efficiency of infrared lamp screening during the vacuum thermal environment test, an automatic screening system for infrared lamps is designed in this paper. The paper first introduces the main indicators required for the infrared lamp screening system and the main components of the system. The detailed design of each part of the system was completed on the basis of investigating the relevant detection methods according to the needs of use. Specifically, it includes mobile device design, circuit design, and software design. According to the design scheme, the machining of each part was completed and the main body of the instrument was assembled. Using the assembled system to complete the automatic test of infrared lamp screening, the test results meet the needs. In addition, the system has a high degree of automation, which greatly improves the work efficiency.
Fault Detection of Areo-engine Actuator Based on Adaptive Radial Basic Function Observer
Authors: Li Dingzhe , Peng Jingbo , Li Shuaiguo , Wang Weixuan , Xu Ruosong
Published: June 2020

Aiming at the fault detection problem of aero-engine actuators, a fault diagnosis method for aero-engine actuators based on adaptive RBF network observer is proposed. Firstly, the system model is established for the faulty actuator, and then the observer-based actuator fault diagnosis principle is established. Secondly, for the problem that the traditional observer is not sensitive to the gradual fault, the nonlinear approximation characteristics of the RBF network are used. The adaptive fault observer design method based on RBF network is applied. At the same time, the sufficient conditions for the convergence of the observer error system are given by using the Lyapunov stability analysis method. Finally, the simulation experiments of different types of actuators for a turbofan engine are carried out. The results show that the adaptive RBF observer designed in this paper is more effective in detecting faults and has certain fault estimation ability.
Establishment of polynomial regional ionospheric delay model by using GNSS dual-frequency combined observations
Authors: Li Weiguo , Chen Yanhong
Published: June 2020

The Global Navigation Satellite System (GNSS) is currently one of the more effective observation methods for measuring the Total Electron Content (TEC) of the ionosphere. At the same time, the ionospheric delay is also one of the most serious error sources affecting the accuracy of GNSS technology. The establishment of the ionospheric model can eliminate and weaken the delay error and improve the accuracy of navigation and positioning. There are many existing ionospheric delay models. For small regions, the ionospheric delay error is usually polynomial model, but the parameters and precision of the polynomial model are not studied deeply. In this paper, by means of Continuously Operating Reference Station (CORS) and precise ephemeris, the data is preprocessed and the combined observation of the P code pseudo-ranges is smoothed by combined observations, so that polynomial ionospheric delay model with different parameters and joint hardware delay of receiver and satellite are generated. And then the accuracy of the model is analyzed and evaluated, it can be concluded that the parameter value of the polynomial regional ionospheric delay model (i=2,k=3) is appropriate, the Klobuchar model can correct the ionospheric delay error from 2.5m to 3.5m, the polynomial model can reach 0.263m or even higher, especially in today’s multi-frequency and multi-satellite system development.
Design of UWB snowflake slot antenna based on Koch fractal
Authors: Wang Liang , Cao Liping , Liu Guijie , Sun Xubao
Published: June 2020

There are many forms of wide-slot aperture printed antennas. This paper presents a new type of ultra-wideband antenna with compact structure from the fractal field. The slot structure of the antenna is composed of the third iteration of the Koch curve, and the tri-band is achieved by etching the snowflake slot on the side of the Rogers RT/duroid 5880 dielectric substrate with a relative dielectric constant of 2.2 and a thickness of 1.6 mm. On the other side, a hexagonal adjustment branch is used to enhance the coupling between the slot and the feeder to widen the bandwidth. The test results show that the antenna’s operating frequency band covers 2.2 to 13.4GHz. The H-plane radiation is omnidirectional, and the gain peak up to 10dB, which is suitable for ultra-wideband wireless communication.
Application of T-Test Method in The High Temperature Test of Air Traffic Control Monitoring Equipment in Civil Aviation
Authors: Yang Yuhang , Zhang Ye , Zhang Huaicai , Luo Qiming
Published: June 2020

Civil aviation ATC equipment needs to fully consider whether it meets environmental requirements before being put into operation. This article introduces the classification of air traffic control equipment and the different harsh environments to which various types of equipment will be subjected. It also introduces the details of the various effects of high temperature on the equipment. Then, taking the high temperature test of the secondary surveillance radar of the civil aviation ATC as an example, this article detailly introduces the test steps according to GB2423.2 for carrying out the high temperature test of this type of equipment. The receiver’s dynamic range was tested during the test. After the test, the test results were calculated using the t-test method. Then, the calculated results are compared with the t-distribution critical value table to judge whether the equipment has passed the high temperature test.
Design of Animal Detector Based on Thermal Imaging Sensor
Authors: Wang Zhaoming , Liu Xiaomin
Published: June 2020

Wandering in the city of stray animals to the life of urban residents, sanitation, safety, etc., bring a lot of trouble and become a thorny problem in urban management. In order to facilitate the search and rescue of stray animals by animal protection organizations, a low-cost animal detection system based on infrared thermal imaging technology was designed in this paper. Based on the infrared thermal imaging technology, the system adopts the Atmega328 microcontroller as the control core, and uses the infrared array senor to detect the external infrared radiation and converts the voltage fluctuations caused by the thermal radiation into digital signals through the built-in ADC. The master control convseudo color images through SPI bus, and interacts with the system through ESP8266 to acherts the temperature information collected by AMG8833, controls the color LCD to display infrared pieve remote control. The infrared detection system has the advantages of small size, low power consumption, low cost, wireless communication and portability. It can realize the search and rescue of small animals in urban areas and the monitoring function of indoor animals.
Degree of Articulatory Dispersion: An Introduction to a Model of Coarticulation
Authors: Hanbin Zhang
Published: June 2020

The purpose of the study is to introduce a new Model of Coarticulation, namely, Degree of Articulatory Dispersion. This paper reviews the Models of Coarticulation, and then the validity of the Degree of Articulatory Dispersion is proved by finding the correlation between the dispersion of DAD and the slope of LEM in the four groups of Monguor consonants classified by the manner of articulation. The finding shows that there is a significant negative correlation between the dispersion of DAD and the slope of LEM. Therefore, Degree of Articulatory Dispersion can be a valid Model of Coarticulation to measure the degree of coarticulation.
The motor testing system design based on SINAMICS S120 inverter
Authors: Zhengtang Liu , Xiangdong Li , Lin Zhang
Published: June 2020

In this paper, an induction motor testing system based on Sinamics S120 inverter is designed and implemented. This system adopts Siemens S7-300 programmable controller as the main control unit, and the Sinamics S120 inverter as the actuator of the companion and subject motors. Because the whole working process is fully automatic controlled by PLC, it has high working reliability. All inverters on one DC generatrix decrease power consumption and have remarkable energy-saving effect and practical value.
Analysis and Treatment Process of abnormal manual Shutdo wn of 1000MW thermal Power Unit
Authors: Ruifu Song , Zhizheng Du
Published: June 2020

The unit 2 of a power plant was shut down manually due to the fire detection fault of coal seam and oil layer. The paper analyzes the specific causes of the incident, points out the problems exposed in the production process, and puts forward the handling and preventive measures.
Development of Distributed Low Voltage Distribution Remote Monitoring System
Authors: Hu Xie Hong , Chen Qiong
Published: June 2020

Intelligent power distribution monitoring technology is an important technology to improve the intelligence and automation level of the power distribution system. However, because the current power distribution monitoring methods in low-voltage power distribution rooms are not very developed, regular manual inspections and manual data recording are needed, leading to efficiency very low, so the research and development of intelligent distribution monitoring system in low-voltage distribution room is very necessary.This system is mainly composed of intelligent electrical parameter collection terminal, 4G data transmission module, Alibaba Cloud Internet of Things platform, and remote power host computer, and each device can perform effective data communication. The system is assigned to each low-voltage power distribution room for unified management and viewing. The low-voltage power distribution real-time monitoring system can realize the real-time monitoring of transformer parameters and wireless transmission, and control the 4G communication module to receive or send data to the Alibaba Cloud Internet of Things platform. The remote cloud can monitor and query electrical parameters in real time, and can also send control instructions to the intelligent collection terminal. The terminal host receives various data (such as the three-phase voltage and current of the transformer, active and reactive power, power factor, frequency, harmonics, environmental temperature and humidity, etc.) from the data collector in real time and analyzes it. Once the data exceeds The set threshold will cause an alarm to prevent potential safety hazards in the low-voltage power distribution room. The experimental results prove that the system can monitor the working status of various electrical equipment in the power distribution room in real time, accurately and efficiently, thereby ensuring the safety and stability of the entire power distribution system, and has certain research value.
Design of Voltage Source for Step Response Calibration System of DC Voltage Transformer
Authors: Zhai Shaolei , Liu Jing , Wei Ling , Chen Ye , Deng Tao
Published: June 2020

Aiming at the lack of the theory and test methods for the transient characteristics of DC (direct-current) transformers and the difficulty of the existing test power supply to meet the test requirements, the step response characteristics of the transformers are studied by designing the step voltage source system of the DC voltage transformers. Capacitor energy storage technology design capacitor energy storage square wave power supply. At the same time, the control loop uses voltage feedback to improve the output voltage stability. The simulation results show that the top of the waveform of the step voltage source system is very flat, there is no obvious overshoot at the leading edge of the output voltage waveform, the stabilization time is much less than 100 μs, and the leading edge rise time is less than 10 μs, which meets the system requirements.
Design and Development of the High Voltage Capacitor Step-down Power-taking Device
Authors: Shuai Zhang , Cong Ma , Peng Wu , Lin Xing
Published: June 2020

The designed device uses high voltage capacitor in series with a voltage transformer to take power. It uses the capacitance voltage resistance and the transforming characteristics of voltage transformer, and the monitoring system is supplied with power by subsequent rectifier filtering and switching circuit. As high voltage capacitor step-down has the problem of limited energy, the set of device uses voltage transformer to increase power output, and the required power are provided to the load end on the basis of the changing of the load end power, and through the relay’s on or off to control the connection or disconnection of the front-end resistance. 10kv voltage transformer are used for 110kv line, and the primary side voltage of the voltage transformer is controlled at 10kV by using the voltage stabilizing function of the rear-connected circuit. Through The overall test of power output is stable, the device operates well.can provide stable and effective low-voltage power supply for the on-line detection device of 110kV high-voltage multiple circuit..
Research and Analysis on Relay Protection of AC-DC Hybrid Distribution Network
Authors: Zhao Xiaomin , Yang Bingyuan
Published: June 2020

The construction of Alternating Current and direct current (AC-DC) hybrid distribution networks is the future development trend. Due to the large number of distributed generation (DG) and power electronic devices, the fault characteristics on the AC side are more complicated. At the same time, due to the control strategy and topology, conventional protection methods has adaptability problems to the power system containing power electronics equipment. Therefore, it is of great significance to study the adaptability analysis of AC-DC hybrid distribution network protection to ensure the safe and reliable operation. This paper summarizes the research on the topological structure, fault characteristics, and protection principles, then analyzes the impact of AC-DC interactions on the protection configuration of the AC-DC hybrid distribution networks.
Wireless Transmission Important Technology and its Impact on the Grid
Authors: Shuai Zhang , Peng Wu , Lin Xing , Ning Wang , Yan Li , Yuan Hu , Shuo Wang
Published: June 2020

With the progress of science and technology, wireless transmission has entered people’s field of vision as a new transmission method. This paper describes the background of wireless transmission technology, and then introduced in detail the short distance transmission of electromagnetic induction, the basic principle of magnetic resonance coupling transmission, and the long-distance transmission of microwave laser, and then discusses the development of wireless transmission technology in detail, and then introduced the important technology that need to be focused on nowadays. Finally, the impact of wireless transmission technology on the grid and its future development direction are illustrated from three perspectives including smart grid introduction, power transmission and distribution, and distributed power supply.
Research on fault diagnosis method of 750kV substation based on Bayesian network and fault recording information fusion
Authors: Shang Poli , Dong Haiying , Li Xiaonan , Ren Wei
Published: June 2020

Aiming at the complexity of the 750kV substation system and the uncertainty of the fault information, this paper studies the fault diagnosis method of Bayesian network and fault recording information. In order to solve the problem of single-source, DS evidence theory is used to fuse the two diagnosis results. Through case analysis, it is proved that the method can effectively improve the accuracy of fault diagnosis.
Analysis and Rectification of Power Line Conducted Emission Test Exceeding Standards
Authors: Shichao Guo , Dandan Guo , Qiongyu Zhang , Nankai Wu , Jiaxin Deng
Published: June 2020

The power transmission emission test (CE102) is the key to electromagnetic compatibility (EMC) testing. The device exceeded the limit at multiple frequencies in the CE102 test. The analysis was performed to locate the curve. The filter was selected based on the frequency characteristics of the filter components and the DC-DC conversion was performed. The harmonic emission of the switching frequency of the converter was analyzed and effectively suppressed. The filter module circuit was set according to the characteristics of the interference source, the key parameters of the filter module was calculated, the rectification method was formulated, and CE102 test was performed again to determine the accuracy of the rectification plan.
Simulation and Analysis of Frequency Hopping Communication Jamming
Authors: Zhang Xiaolu , Quan Houde , Cui Peizhang , Sun Huixian
Published: June 2020

In modern warfare, the victory of electronic warfare has become one of the key factors affecting the victory of war. It is an important part of electronic warfare that high-efficiency jamming is used to interfere with enemy frequency hopping (FH) communication systems. Firstly, Simulink is used to establish models of a FH communication system, noise jamming, tone jamming, sweep jamming, and follower jamming. Secondly, performance of the four jamming is analyzed. Finally, bit error rate (BER) is used to evaluate and compare the performance of them.
Research on Visual Control System of Inverted Pendulum Based on Pixel Displacement
Authors: Liu Bing , Zhan Bin , Zhang Changda , Yang Lisi
Published: June 2020

In inverted pendulum visual servo control system (IPVSCSs), how to achieve the fast and effective measurement of the state information of the inverted pendulum is an important task. In this paper, the characteristics of the inverted pendulum are considered and a series of image processing and positioning algorithm of the pendulum are proposed. Furthermore, the inverted pendulum control system model based on the pixel displacement is established and the LQR controller is designed. Finally, the feasibility and superiority of the proposed method are verified by real-time control experiments.
Design of Multi-point Intelligent Temperature Monitoring System for Transformer Equipment
Authors: Na Qu , Wen You
Published: June 2020

With the development and progress of industrial technology, the temperature range of factory substations is required strictly, and most of the temperature measuring devices widely used in the market at present are single-point measurements, with the disadvantages of slow transmission speed and imprecision, etc., it is disadvantageous for the controller of the substation equipment to make a decision in time according to its temperature change. This subject is based on single-chip microcomputer as the core of the control components, the acquisition temperature through the acquisition channel multiplexing technology, to achieve multi-point temperature monitoring and recording. A temperature measurement and control system is composed of a / D conversion photosensitive triode, a temperature sensor and a light intensity acquisition, detection and display. The temperature sensor is controlled by a single-chip microcomputer to collect the temperature, and the temperature is fed back to the single-chip microcomputer to make corresponding analysis and processing, it has powerful data processing function, intuitive display, friendly interface and high cost performance, and can be widely used in industrial and agricultural control, mechatronics engineering, smart home and many other fields.
Control Strategy of Coolant Flow Rate and Temperature of Battery Pack Based on Double Fuzzy Controller
Authors: Zhao Yang , Wang Hengfu , Zhou Qinkai , Luo Yuan , Zhang Meixia
Published: June 2020

The temperature and flow rate of coolant have a great influence on the performance of the cooling system. Too low temperature of coolant will increase the temperature difference between single batteries, and too high temperature will not be conducive to battery cooling. If the flow rate of coolant is too high, it will lead to the increase of system energy consumption and reduce the vehicle’s mileage, but too low flow rate of coolant will lead to the increase of battery temperature, which will bring safety risks. In order to solve these problems, this paper takes both the maximum temperature and the maximum temperature difference of the battery into consideration and proposes a double fuzzy controller. Compared with the step control scheme, the maximum temperature is reduced by 3 °C, and the maximum temperature difference is reduced by 1.75 °C, and the energy consumption is reduced by 13.3%.
Research on Kernel-Distance-Based AEWMA-t Control Method
Authors: Yang Yatang , Chen Fumin , Tian Yiyu
Published: June 2020

Aimed at the complex data correlation among multivariate quality characteristics of products, inability to obey the assumptions of traditional control methods, low data volume in small and medium batch production, and inaccurate parameter estimation in process control, an AEWMA-t control method based on kernel distance data is proposed. Firstly, based on the support vector data description algorithm, the hypersphere is trained by normal samples. Then the kernel distance from the sample to the center of the hypersphere is calculated and the kernel distance is normally converted. Finally, the process is controlled with AEWMA-t control method. Case analysis shows that, compared with the traditional multivariate control methods, this method has good ability to detect anomalies in the mean deviation interval of each process, and is not restricted by the distribution and size of the data samples.
Carrier phase shift modulation and voltage equalization control strategy in modular multilevel converter
Authors: Zhiqi Xu , Xiancang Ai
Published: June 2020

In order to solve the problem of voltage fluctuation of sub-module capacitors in Modular Multilevel Converter, based on carrier phase-shifted sinusoidal pulse width modulations, this paper analyzes the effect of different carrier phase shift modulation and the number of sub-modules on a single bridge arm on the number of output levels and uses proportional control to make capacitor voltage balance and PI control to suppress bridge arm circulation. The method has a good stability effect on the sub-module capacitor voltage.A 31-level model is built in MATLAB/simulink to analyze the capacitor voltage fluctuation, output current and voltage distortion rate, and bridge arm current of the sub-module. The voltage and circulation fluctuation range is compared when there is no circulation suppression. It is verified that the method is simple and effective.
Interference Control of Cognitive Network Based on Swarm Intelligence Algorithm
Authors: Chi Yunbing , Zhang Luyong
Published: June 2020

This paper proposes a non-cooperative spectrum allocation algorithm based on game theory in a multi-cognitive wireless network scenario. The interference is selected as the basis for establishing the utility function. In order to avoid problems such as excessive calculation of the iterative algorithm and failure to obtain the optimal solution, etc. In this paper, an improved swarm intelligent bat algorithm is proposed. Compared with the original bat algorithm, the improved bat algorithm is richer and more accurate in speed and location update strategies, which improves the diversity of the population. The improved algorithm is applied to the spectrum allocation problem. By rationally allocating spectrum resources, the interference level of the multi-cognitive wireless network system is effectively reduced. It is applicable to dealing with the interference control problem in distributed cognitive radio networks.
Load-Frequency Control Strategy of Power Grid with High Penetration Wind Power Based on Active Disturbance Rejection Control
Authors: Xu Tianqi , Zhuang Yuan , Li Yan , Zhang Enmu , Kong Lingling
Published: June 2020

After large-scale wind power is integrated to the grid, the randomness and uncertainty of wind power will cause problems of active power imbalance and frequency fluctuations, which puts forward higher requirements for load-frequency control of power grids with wind power integrated. Based on the analysis of the load-frequency control system of power grids with wind power integrated, a novel load-frequency control model based on active disturbance rejection control considering random fluctuating wind energy is proposed. The simulation results show that not only the proposed model can effectively maintain the system frequency, but also the control effect is significantly better than the conventional PI load-frequency controller.
Quantum sensing networks for the estimation of linear functions
Authors: Rubio Jesús , Knott Paul A , Proctor Timothy J , Dunningham Jacob A
Published: June 2020

The theoretical framework for networked quantum sensing has been developed to a great extent in the past few years, but there are still a number of open questions. Among these, a problem of great significance, both fundamentally and for constructing efficient sensing networks, is that of the role of inter-sensor correlations in the simultaneous estimation of multiple linear functions, where the latter are taken over a collection local parameters and can thus be seen as global properties. In this work we provide a solution to this when each node is a qubit and the state of the network is sensor-symmetric. First we derive a general expression linking the amount of inter-sensor correlations and the geometry of the vectors associated with the functions, such that the asymptotic error is optimal. Using this we show that if the vectors are clustered around two special subspaces, then the optimum is achieved when the correlation strength approaches its extreme values, while there is a monotonic transition between such extremes for any other geometry. Furthermore, we demonstrate that entanglement can be detrimental for estimating non-trivial global properties, and that sometimes it is in fact irrelevant. Finally, we perform a non-asymptotic analysis of these results using a Bayesian approach, finding that the amount of correlations needed to enhance the precision crucially depends on the number of measurement data. Our results will serve as a basis to investigate how to harness correlations in networks of quantum sensors operating both in and out of the asymptotic regime.
Development of Anger Reduction Animated Video for Indonesian Car Driver
Authors: Putranto L S , Tajudin A N , Rostiana
Published: June 2020

Driving, especially in congested traffic, might trigger anger and this could be calmed down by accepting appropriate advice through animated socialization video. In this paper, we will discuss the development of anger reduction animated video for Indonesian Car Driver based on driver anger scale measurement in Denpasar, Manado, and Padang. In each city, we asked 200 respondents to fill the driver anger scale consist of 100 motorcyclists and 100 car drivers. Therefore, the overall sample was 600 respondents. A mean different analysis with 2.5 (the departure from not angry to angry) was conducted on 14 items of the scale. In general, the mean responses were less than 2.5 or only marginally above 2.5 except for items 3 (other road users keep changing lanes), 9 (a car moving back without looking) and 13 (a truck kicks up gravel to your vehicle). Therefore, we only design the animated socialization videos for these items.
Classification on Shape of Granitoid Boulder Based on Size and Surface Roughness from Various Weathering Zones for Site Investigation Purposes
Authors: Md. Dan @ Azlan Mohd Firdaus , Naja Marcos Marcelia , Mohammad Edy Tonnizam , Komoo Ibrahim , Madun Aziman
Published: June 2020

Boulder is often posed challenges to earthwork activities such as cut slope and foundation excavation especially in tropical weathered rock like Malaysia. In addition, the guidelines for hard material or rock excavation related to boulder provided by Department of Works Malaysia (JKR) are limited and there is a need to be revised. Therefore, this study aims to establish a classification chart of boulder’s shape in different weathering zones for site investigation purposes. The parameters of size, volume and characteristics of surface roughness from moderately to completely weathered zone were measured and analysed statistically. Results of this study show that the increase of weathering zone from zone 3 to 5 significantly reducing the size and volume of boulder with reduction of 27% and 38.3%, respectively. Boulder in Zone 3 to Zone 5 can be classified into six typical sphericities: very flat, flat, sub- flat, sub-spherical, spherical and well-spherical. The results also revealed that the physical parameters of boulder can be classified into six classes based on Roundness Ratio (Rr) and Surface Roughness Index (SRI). Based on these results, a boulder shape classification chart was developed and useful as a guideline for engineering application especially in soil investigation purposes.