bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on modeling method of honeycomb plate and its application on solar wing
Authors: Luo Haitao , Fu Jia , Wang Haonan , Li Yuxin
Published: August 2019

Aerospace products need to simulate the complicated working conditions through dynamic simulation analysis to ensure the high reliability of product design. In this paper, the equivalent modeling method of honeycomb sandwich plate based on finite element analysis is studied, and the mechanical characteristic parameters of honeycomb core structure are obtained. At the same time, the composite components of satellite solar cell array are modeled and simulated. The modal analysis and frequency response analysis are carried out to provide an important basis for the design and improvement of the structure.
Evacuation Entropy Path Planning Model Based on Hybrid Ant Colony-Artificial Fish Swarm Algorithms
Authors: Wang Fang , Wang Jian , Chen Xiaowei
Published: August 2019

The artificial fish swarm algorithm is introduced to construct the evacuation entropy path planning model of hybrid ant colony-artificial fish swarm algorithm to improve the convergence speed of the model. In the early stage of the model, the advantage of artificial fish swarm algorithm is used to search the optimal solution quickly and generate the initial solution. In the later stage of the model, the strong positive feedback mechanism of ant colony algorithm is used to quickly iterate out the optimal path. At the same time, the crowding factor of artificial fish swarm algorithm is introduced to update local pheromones adaptively combined with evacuation entropy. The simulation results show that the hybrid ant colony-artificial fish swarm algorithm has fast convergence speed and can avoid falling into local optimum.
Numerical simulation of solitary wave interacting with gasbag-type floating bridge using the ALE method
Authors: Lou Yun-feng , Ma Zhi-qiang , Chen Rong , Jin Xian-long
Published: August 2019

The dynamic numerical modeling theory and wave impact calculation method of gasbag type floating bridge (GTFB) were studied by using the multi-material Arbitrary Lagrangian-Eulerian (ALE) method and penalty function method. The air and seawater were described by the ALE method, the structure of floating bridge was described by the Lagrangian method and the coupling force between floating bridge and flow field was calculated by penalty function method. The floating bridge-fluid coupling models were established by HyperMesh software. Then, the models and calculation parameters were validated. The structural responses of the GTFB under solitary wave impacting were analyzed. The results show that the maximum contact force of hinge and maximum stress of gasbag appeared at the ends of the floating bridge, and the maximum bending moment of hinge appeared in the middle section.
Finite element analysis of the structure of an electronic equipment shelter
Authors: Zhang Qi , Gao Dinghan , Wang Huang
Published: August 2019

Due to the special structure of the shelter, the cost of trial production and experimentation in the design stage is very high. In order to research the static characteristics of the electronic equipment shelter, the structure of the electronic equipment shelter is discussed. The ANSYS finite element analysis software is used to establish the equivalent finite element model of the overall structure of the electronic equipment shelter and the bearing platform. The static simulation of the body structure under specific working conditions is carried out, and the stress and strain state are obtained. At the same time, the modal superposition method is used to analyse the overall transport vibration response spectrum of the electronic equipment shelter and the bearing platform. The results show that the maximum stress value of the electronic equipment shelter is less than the allowable stress, and the maximum deformation is also in full compliance with the requirements. At the same time, it meets the requirements of the transportation vibration environment adaptability of the electronic equipment shelter, and provides design reference for the similar electronic equipment shelter.
Application of Wavelet Analysis in the Vibration Signal of the High Dam Drainage
Authors: Gu Yujie , Xi Ruichao
Published: August 2019

Wavelet analysis is a localized time-frequency analysis method,it uses the combination of time domain and frequency domain to show the characteristics of a signal. In this paper uses the wavelet analysis to decompose the vibration signal in different frequency band. And we can get the energy of the signal in different frequency band and the vibration characteristics of the slab by decomposing different frequencies and the different scales of the signal analysis at the different frequency band. According to the signal noise sigma, doing the wavelet threshold noise reduction uses the general threshold, the threshold set by Birge-Massart strategy, the threshold set by penalty strategy and the strategy of the threshold to estimate sample signal, then gets the best scheme.
Parameters identification of PMSM based on self-adaptive DE algorithm with hybrid mutation operator
Authors: Wang C , Liu Y C , Wei Y , Chen Y , Xu M Y , Guo H H , Zhang Q J , Liang X L
Published: August 2019

The parameter identification of permanent magnet synchronous motor (PMSM) is an important and challenging task of power electronic systems, which has an important impact on the control performance of the drive system. Due to hardware limitations, this problem requires both a higher solution quality and a faster convergence speed. Aiming at the parameter identification problem, an adaptive differential evolution algorithm based on hybrid mutation operator (SHDE) is proposed. In this method, a randomly selected optimal solution is mixed with the current population, and a new mutation operator is developed, called “current to best archive”. Therefore, the algorithm can use the best search memory to date to generate promising solutions, resulting in a faster evolutionary process. In addition, the SHDO corresponding control parameters are adaptive without the need of trial and error and error processing, and the appropriate control values are obtained. In addition, the parameter estimation program is introduced into the permanent magnet synchronous motor simulation and solved by the Newton-Raphson method without prior assumption and simplification. The framework can be used in any interference-prone working conditions and, unlike other publications, has a wider range of applications. The parameter identification method of permanent magnet synchronous motor drive system under two different operating modes was evaluated. Comprehensive results and statistical analysis show that SHDE can find higher quality solutions with higher convergence speed and probability than other most advanced algorithms.
The Software System Implementation of Speech Command Recognizer Under Intensive Background Nosie
Authors: Song Jingyu , Chen Bo , Jiang Kun , Yang Miaosheng , Xiao Xi
Published: August 2019

A device for speech command recognition is designed and implemented in this paper. The adaptive filtering technique is adopted for speech enhancement by using two microphones for sampling the background noise and noisy speech signal correspondently. The connected-word speech recognition algorithm based on HMM is employed for speech command recognition. The experiment shows that the equipment can work well under the background noise of 90dB.
Fault Detection of UAV Fault Based on a SFUKF
Authors: Zhong Wang , Xin Chen
Published: August 2019

The UAV system is a typical closed-loop control system. Its good robustness can inhibit the fault signal, which poses certain difficulties for the detection of early or small amplitude faults. In this paper, a nonlinear longitudinal control system model of a class of UAVs is established, and a fault detection method based on the suboptimal fading unscented Kalman filter (SFUKF) is designed. Aiming at the common failure of actuators and sensors of the drone, this paper proves that the method realizes the fault detection of the airspeed tube blockage and the elevator part failure by simulation.
An Improved Rotor Position Estimation Method for PMSM Based on Pulsating Square-Wave-Type Voltage Injection
Authors: Lin Cheng , Sun Jiaxu
Published: August 2019

This paper presents a pulsating high-frequency square-wave-type voltage signal injection based sensorless rotor position estimation method for permanent magnet synchronous motors (PMSM). In order to increase the injection frequency so as to enhance the control system’s bandwidth, square-wave-type voltage is injected instead of sinusoidal voltage. To avoid disturbances, the sampling frequency is set as equal to the PWM switching frequency so that the injection frequency can be half of the switching frequency. Due to the characteristics of the square-wave-type voltage, the signal processing is further simplified without the use of filters, which can eliminate the time delay and increase the system’s computational efficiency and feasibility. As a result, the rotor position estimation performance is improved and the sensorless control system’s dynamics is enhanced. Results of simulation verify the effectiveness of the proposed method and its applicability to PMSM sensorless control systems.
Analysis of Characteristics of Industrial Power Load in a Certain Region
Authors: Tiantian QIAN , Ke WANG , Fei SHI , Kedong ZHU
Published: August 2019

Cluster analysis was done on the industrial load in the same class industry, based on the industrial daily load data collected in a certain region. The results obtained indicate that even in the same industry, there are still large differences in load characteristics, and there is a certain similarity between loads in different industries. Compared with the traditional results of cluster analysis of the overall industrial load, cluster analysis by industry will help power companies to carry out more precise load management.
Theoretical Modeling and Experimental Verification of Rotating Ultrasonic Drilling
Authors: Sun Hong
Published: August 2019

Aiming at the problems of large drilling ability and serious wear of drill bit tool in the process of drilling, the connecting plate workpiece in the high strength engineering mechanical connection parts of carbon fiber reinforced composites is studied, and the theoretical model of ultrasonic drilling is established, and the simulation analysis is carried out by using the professional numerical calculation software MATLAB. The influence of the main parameters such as tool feed speed, spindle angular velocity and ultrasonic amplitude on the drilling force during ultrasonic drilling is studied, and the relevant parameters under the same working conditions of simulation are verified by experimental method. The simulation and experimental results show that with the increase of tool feed speed, the drilling force shows the trend of increasing gradually, and with the increase of spindle angular velocity and ultrasonic amplitude, the drilling force shows a decreasing trend, and the simulation value of maximum drilling force under different parameters is basically close to the experimental value, which verifies the correctness of the theoretical model. It provides theoretical basis and important reference for the improvement of the comprehensive performance and product quality of the ultrasonic drilling parts of carbon fiber reinforced composites, the popularization and application of the theoretical model of ultrasonic drilling, the optimization of ultrasonic drilling process parameters, and the ultrasonic processing and molding of composite materials.
Application of micro wire on the sample made from asphalt mixture with using bitumen
Authors: Bokomlaško J , Mandula J
Published: August 2019

The micro wire are new possible sensors, when serves for the contactless measurement of the deformations, which arise in the sample. We can have correct measurement, with right length, diameter and application of the micro wire on the sample. The micro wire was used to two samples, which were made of asphalt mixture AC 11. Bitumen was used in order to glue the micro wire to the test sample. The signal was sufficiently strong for both test specimens. Measurement was made on a sample in the form of a beam. The reaction of the micro wire to the load applied was evaluated. Measurement was done in cycles. In total, three measurement cycles were performed. Measurement results were evaluated.
Evaluation of the effect of concrete strength increase on buckling resistance of concrete filled tubes
Authors: Bukovska P
Published: August 2019

The paper deals with the behaviour of steel tubular columns filled by high-strength concrete at compression load. Attention is paid especially to the strength of the used concrete and its effect on the buckling resistance of column. Results of the experimental part of research have shown that increasing of concrete strength is efficient only to a certain extent. It was found in the experimental analysis that the use of concrete class C80/95 has only little effect on increase of buckling resistance as compared with the use of concrete class C55/67. In order to evaluate the efficiency of the concrete strength increasing, a theoretical study was carried out, the results of which are presented in this paper. The paper also discusses the possibilities of using other types of concrete (light-weight concrete or slightly reinforced concrete) with regard to their contribution to improving the bearing capacity and taking into account the production costs of the steel - concrete tubular column.
Effect of water wall prototype on air humidity
Authors: Čákyová K , Vranay F
Published: August 2019

The presented document focuses on the effect of the water wall on air humidity (humidification and dehumidification of air). For the purpose of impact verification, a water wall prototype that was tested under laboratory conditions (climate chamber) was designed and built. Also a set of measuring sensors has been installed, these sensors are able to continually record air temperature and humidity and water temperature. In the case of air humidification, the water temperature and air temperature were equalized approximately after 2 hours and after 6.5 hours the air relative humidity reached 92%. This represents an increase in the specific humidity of 4.5 g/kg versus the initial state. The article also describes methodology and measurement of condensation ability of the prototype. In case of air dehumidification process, three different relative humidity was tested at the same air temperature. During the measurement periods, there was increasing the amount of condensate several times by increasing the relative humidity.
Slab deformations caused by shrinkage – experiment vs. numerical calculation
Authors: Kušnírová D , Priganc S
Published: August 2019

This article gives an overview of the experiment, which aims to detect the effect of the shrinkage on the stress and the strain of the slabs reinforced at one surface by different types of reinforcement (steel and GFRP reinforcement). Some partial results from the strain measurements on steel reinforced slabs and their comparison with numerical calculation are also reported in the article. From publications found larger bending tensile creep towards compression creep can explain the difference between calculation and experiment.
New aspects of shore stabilization
Authors: Slezingr M , Fernandez P A , Ondrejka Harbulakova V , Pelikan P
Published: August 2019

The basis for a design of stabilization measures for banks of watercourses and reservoirs is an assessment of the bank from the perspective of the material it consists of, the existing slope inclination, and the current elements of natural or artificial stabilization. Another important step is to assess the potential cause of the bank damage, the probability of its occurrence, and the significance of possible damage with respect to the bank usage. If the basic assessment of the current state of the riparian area concludes it is really possible that erosion damage to the bank may appear and develop, one of the types of bank reinforcements has to be designed.
Evaluation of the antimicrobial efficiency of slag based composites
Authors: Smolakova M , Vojtkova H
Published: August 2019

Degradation of cement mortar composites occurs due to a variety of causes such as corrosion (sulphate or chloride attack) cracking or shrinkage. Chemical agents often play a major role in corrosion processes, however recent research has revealed the importance of biological agents. Microbiological corrosion is caused by the presence and activities of microorganisms, including algae, bacteria, yeasts and fungi. These microorganisms produce substances like biogenic organic and mineral acids that can disrupt the matrix of mortar composites. The most effective method for improving the resistance of cement based composites is the addition of pozzolans like blast furnace slag. Slag is often used in preparation of cement composites to improve the acid resistance, impermeability and crack resistance of mortars. This article presents the investigation of antimicrobial efficiency of blast furnace slag regarding the selected species of bacteria (Pseudomonas aeruginosa, Micrococcus luteus), yeasts (Candida albicans, Saccharomyces cerevisiae) and algae (Chlorella vulgaris). Antimicrobial properties were studied on mortars with different share of slag (65% - 95%). Antimicrobial efficiency for the tested species of microorganisms was found moderate to low.
How and where to use technology of laser scanning and aerial photogrammetry for building purposes – case study
Authors: Tkáč M
Published: August 2019

Laser scanning is a method of high – accuracy mapping or reality capture that uses laser beams to quickly capture complete detail of the entire building construction project in a short time. Laser scanners are a great tool for measuring existing buildings but not always because they have the same problem as visual surveys-if you can’t see it, you can’t scan it, i.e. the laser beam from the scanner can’t measure a certain part of the surface of the structure if this part isn’t in the scanner’s field of view. In particular, this limitation applies to the surfaces of the roof structures and certain parts of the facades. In these cases, the resulting point cloud may contain no information from the building surface what may be a problem for the final results. A possible solution is a combination of two technologies, terrestrial laser scanning and aerial photogrammetry. Aerial photogrammetry (or airborne imagery) means taking of photographs from an unmanned aerial vehicle (i.e. “drones”). The aim of this paper is to describe the use of these two technologies, it means, when it is better to use these technologies separately and when it is better to make their integration. As a reference building the Faculty of Civil Engineering, located in Kosice, Slovakia was chosen
Zero house by 3D printer technology
Authors: Wawrek I
Published: August 2019

Implementation of 3D printing technologies into building process is recently one of the most developing sectors. Research teams come every day with new ways of use of this technology. Research is focused on testing thermal – technical properties of certain wall structure built by 3D printing additive technology. Based on results of calculation and measurements will be done optimization of design of mentioned wall structure. The goal of the research is to design wall structure with performance of “zero” house. Another goal is to extend knowledge in area of 3D printing and create new possibilities to better adaptation autonomics 3D printing to building process of the future.
Research on lightning radiation electromagnetic field of induced thunder on the ground of perfect conductor
Authors: Li Mu , Li Tao , Ye Chunyong , Fang Shubo
Published: August 2019

The influence of lightning on smart substation mainly includes three aspects, one of which is lightning striking the grounding body of adjacent smart substation and affecting smart components through space electromagnetic induction. When the lightning strike point of induction lightning is in the station, its radiation field is closely related to the location of the lightning strike point. It is necessary to verify whether it meets the electromagnetic compatibility level of intelligent components of lightning radiation field according to the actual situation. Firstly, the simulation model of intelligent component under the influence of induction mine is studied, and the steps of simulation modelling are given. On this basis, through derivation, the calculation method and corresponding formula of lightning current radiation field on the ground of perfect conductor are given in detail.
First-Principles Study of Structural, Elastic, Electronic and Optical Properties of Zinc Ferrite Spinel
Authors: Meng Yifeng , Shi Weimei , Lu Chao , Yang Shiqing , Yang Qingxue , Deng J. G.
Published: August 2019

Structural, electronic,elastic and optical properties of ternary spinel oxides ZnFe2O4 have been studied by using first-principles calculation. The results show that all elastic constants are consistent with the mechanical stability criteria for cubic crystals, which indicated that ternary spinel oxides ZnFe2O4 are mechanically stable. The perfect spinel ZFO has the properties of direct bandgap semiconductor, which decreases with the increase of pressure.The DOS and Mulliken overall analysis shows that the Zn-O bonds and Fe-O bonds are covalent, and the Zn-O bond is stronger than the Fe-O bond. The results of the calculation show that the optical properties are in good agreement with the recent experimental results.
Simulation Analysis of Six-axis Manipulator
Authors: Tian Zhihong , Li Yaoyao , Tian Shuo , Ning Peiying
Published: August 2019

The D-H parameter method is used to model the six-axis manipulator. Based on this model, the forward and inverse kinematics equations of the manipulator can be derived, so that the relationship of manipulator joint angle and the pose of manipulator can be obtained. Using the fifth-order polynomial interpolation method realizes the manipulator trajectory planning. In this paper, using the free Robotics Toolbox to simulate manipulator, the results show that the simulation of the manipulator is accurate and intuitive, which can provide theoretical basis and reference basis for the actual design and motion control of the manipulator.
RGV Dynamic Scheduling Strategy Based on Network Cellular Automaton and Marko Model
Authors: Yin J Y , Chen N , Zhang Z T , Chen S S
Published: August 2019

In an intelligent processing system, if a Rail Guide Vehicle (RGV), also known as automated guide vehicle, is provided with the optimal dynamic scheduling strategy, the work efficiency and economic profit of the workshop can be greatly improved. This paper considers the variable number as well as the types of Computer Number Controller (CNC) and regards the real problem as the Job Shop Scheduling Problem (JSSP). To solve JSSP, this paper use Network Cellular Automaton (NCA) to abstract the flexible workshop system and apply the rule of one-step trial-and-error for the core link between the network cellular automaton and the Markov Transition Probability Matrix. Further this system is simulated using Markov chain in probabilities to expand the solution space with the optimal solution among according to the Monte Carlo experimental principle. Finally, the result can jump out of the local optimal solution and approximate the global optimal dynamic scheduling strategy by trial-and-error rule and Transition Probability Matrix. To verify the NCA-Markov model, this paper use an intelligent flexible workshop which produces two-process materials. By simulating this system with the model, the efficiency of the intelligent processing system can be greatly improved.
Speed Trajectory Tracking Control for Free-Floating Space Robot with Uncertain Inertial Parameters
Authors: Qi Tian , Yanfei Liu , Zhong Wang , Pengtao Zhao
Published: August 2019

A speed trajectory tracking control (STTC) approach is proposed to optimize the end-effector trajectory tracking control for free-floating space robot (FFSR) with uncertain inertial parameters, where two stages controller are designed by the state dependent Riccati equation (SDRE). Firstly, the first-stage SDRE nominal optimization controller is designed by using the nominal system model. Next, by analyzing the error transfer process resulting from uncertain parameters under the nominal control law, the second-stage SDRE compensated controller is designed by the state dependent matrix (SDM) of the system state errors. Then, the optimization tracking control for the FFSR with uncertain inertial parameters is achieved by combining the first-stage SDRE nominal optimization controller and the second-stage SDRE compensated controller. Finally, numerical simulations are given to demonstrate the proposed approach which satisfies the precision of the tracking error and the optimization requirement of the input torque.
Back pressure optimization of direct air-cooled condenser considering anti-freezing and low-load operation
Authors: Feng Pengyuan , Luo Zhiling
Published: August 2019

Direct air-cooled condensers are widely applied in northwest China because of water-saving. In order to improve the economical operation of the direct air-cooled condenser, based on the mechanism model, this paper calculates the optimal back pressure considering anti-freezing and low-load operation with considering the switching state of the exhaust steam isolation valves, and ensuring the minimum exhaust steam. The influences of ambient temperature and load ratio on optimal back pressure and energy saving are studied, which provide guidance for cold-end optimization and economic operation of direct air cooled condensers.
A New Ultrasonic Gas Meter for Household Application
Authors: xiaodan Xu , fuzeng Li , fugen Zhou , weiguo Zhao
Published: August 2019

This paper proposes a new ultrasonic gas meter based on the time difference method. The gas flow measurement model is derived to reduce the environmental impact. A fluid pipeline structure is designed to reduce the impact of the flow field on the measurement. The max35104 time measurement chip is selected and the corresponding transmit and receive circuits are designed. Finally, the ultrasonic gas meter is tested in a standard device. The experimental results show that the designed household ultrasonic gas meter has an accuracy rating of 1.5 level.
Influence of CNC Tools on CNC Machining Technology
Authors: Yinsheng Wan
Published: August 2019

The continuous development of China’s production technology has brought a broader space for the development of CNC technology, bringing a new intelligent development direction for the machinery manufacturing industry, which has a great impact on the production of tools. The birth of CNC tools has promoted the development of the CNC industry and promoted the CNC machining process. This paper aims to analyze and study the CNC tool and its machining process.
Security Monitoring of Railway Power Cable Joints Based on AD7606 AC Synchronization Sampling
Authors: Liu Jiajun , Du Zhiliang
Published: August 2019

To avoid the frequent accident of burning loss of railway 10kV power cable joints, an online monitoring device is developed based on tanδ, the tangential value of loss angle of the cable’s main insulation, and other state variables, to carry out real-time monitoring and safety evaluation of the cable’s running state, so as to timely alarm and predict hidden accident danger for abnormal cable joints. The measurement of tanδ adopts a frequency correction method based on AD7606 AC synchronous sampling and FFT phase difference frequency correction, which can avoid the spectrum leakage effect of asynchronous sampling and the phase-locked loop synchronization circuit with complicated cost. This paper regards the current source of grounding wire of railway cable when no electric locomotive passes through the railway electrical section as leakage current of the main insulation of cable. Tanδ is monitored by collecting and processing the voltage of cable bus-bar potential transformer and the current of cable grounded wire.
Research and Simulation of High Precision Signal Generator Based on Single Chip Microcomputer
Authors: Yue Jiaxin , Pu Aimin , Zhao Jingzhe
Published: August 2019

The function signal generator uses the integrated circuit IC8038 for signal generation. After filtering, signal amplification, relay network signal strobe, and resistor divider, it outputs square wave, triangle wave and sine wave with adjustable amplitude ranging from 0V to 10V and adjustable frequency ranging from 100Hz to 20KHz. The relay network is controlled by the single-chip STC12C5A60S2, and the signal selection and output are controlled by the single-chip microcomputer, too. The function signal generator can generate triangular, square and sinusoidal signals from 100HZ to 20KHZ. It has the characteristics such as low cost, good signal quality and easy operation, thus improving the intelligence level of the signal generator.
Design of Safety Drive Module for DC Switch Machine without Relay
Authors: Ren Xiguo , Ding Huan , Han Shuai , Ge Shumin
Published: August 2019

Aiming at the shortcomings of centralized control in the railway signalling system interiorly. This paper introduces a safety driving module of the DC switch machine, which utilizes the advanced power electronics technology based on the “Failure-Safety” principle and could reach SIL4 level. The module is directly installed in the trackside control cabinet. After receiving the control command of the control centre, the module could ensure safe and reliable operation trackside DC switch machine without relay. At the same time, the module solves the problem of current surge when the DC Switch Machine is starting operation. The module is running stable, strong practicability by experiment. It will play an important role in the distributed trackside control system.
Research on Collaborative Method of Road Smart Lighting
Authors: Wang Zun , Wang Zhisen
Published: August 2019

Road Smart Lighting uses networked street lights and smart models for research and application, enabling them to meet the different needs of urban road lighting dynamically. The article goes deep into the understanding of the concept of smart lighting and clarifies the difference between intelligent lighting and smart lighting, which is of great significance for the application optimization of smart lighting. According to the road lighting standard, this paper proposes a street lamp terminal coordination scheme based on the perception layer to solve the problem of insufficient linkage of street lamp terminals. In addition, the energy consumption caused by the "Constant light mode" in road lighting and the lack of coordination and coordination of streetlight terminals in the lighting control system is improved.
Oracle RAC performance Comparison on Physical Servers and VMware VSAN Servers
Authors: Wei Ying
Published: August 2019

The physical performance of the Oracle RAC hardware architecture directly affects Oracle’s output performance. In this paper, we perform performance tests on three Oracle RAC hardware architectures, and the test data is simulated using real teaching management system data on campus. The simulation results show that the two new oracle RAC hardware architectures are respectively occupied by the TPM and IOPS indicators, and the overall is stronger than the traditional external storage architecture.
Application of Mechanical Automation Technology in Manufacturing
Authors: Qian Xuejun , Wang Shenyin
Published: August 2019

Absrtact

With the continuous emergence and development of high-tech industry, more and more fields began to try automation technology, and under the promotion of automation technology has made extensive achievements. In this paper, the concept and components of mechanical automation technology are analyzed through the practical application of automation technology in the field of mechanical manufacturing. This paper discusses the main application fields of automation technology in mechanical design and manufacturing industry, such as the contribution of computer, virtualization, intellectualization and so on, as well as the improvement of enterprise competitiveness and product quality, in order to promote people’s understanding of automation technology.
Design of PMSM Speed Control system based on simulink Model
Authors: Liu Wengliang , Xu Pengfei
Published: August 2019

The application of motor speed control system in industrial production, automatic control, aerospace and other fields is more and more extensive, but more and more complex speed control system makes the programming of digital controller become more and more difficult.This paper presents a simulation model of permanent magnet synchronous motor (PMSM) speed control system based on magnetic field oriented control (FOC) based on MATLAB/Simulink software, through which the executable code engineering files of DSP are generated automatically.In addition, the algorithm model built by Simulink is only suitable for the pure software environment, and the model can not be directly applied to the actual digital control.Therefore, this paper first builds the FOC control model based on pure software simulation, then converts it into a pure discrete control model. Finally, by configuring some necessary parameters, the model automatically generates DSP executable C language code.This method accelerates the development speed of digital controller code in the speed regulation system, reduces the difficulty of the system code development, and has great practical application value.
A Positive Feedback Mechanism of Adaptive Dynamic System
Authors: Wang Pengchao , Chen Fucai , Cheng Guozhen
Published: August 2019

Address dynamic technology can effectively counter reconnaissance of attackers, protect Intranet hosts by hiding their real addresses. This paper combines address dynamics technology with honeypot technology, and provides adaptive strategy guidance for address dynamics by analysing attackers’ scanning tendencies. This paper designs and implements an adaptive dynamic system(ADDS) that disguises IP and MAC adaptively based on SDN. The experimental results show that the MAC and IP adaptively dynamic can achieve the optimal balance between benefits and costs, effectively deceive attackers who are sniffing in the internal network, delay the detection speed, reduce the success rate of the attackers in identifying the host, and interrupt the continuity of network attacks.
Robust control of refrigeration system based on disturbance observer
Authors: Shang Yujia , Liu Xiaojing , Lu Tielin
Published: August 2019

This paper presents a robust control algorithm combining the disturbance observer to compensate the serious parameter perturbation and model uncertainty in the refrigeration system. The nonlinear disturbance observer is designed to estimate the composite disturbance value. Based on the 5th-order simplified model of the refrigeration system, the sliding mode control method is designed for the evaporator and the condenser respectively to compensate the disturbance. Comparison result with the integral nonlinearity method demonstrates the superior capability of the proposed method on disturbance rejection, which can effectively guarantee the efficient and stable operation of refrigeration system.
Design and Modelling of a Hydraulic System for Detecting Solenoid Valve Based on Bond Graphs Method
Authors: Fan Xiangwen , He Yongyi , Fang Minglun , Cheng Pengfei
Published: August 2019

A novel system is developed in this paper for detecting solenoid valve which is a key component in many industries as automobiles, power equipment, chemical engineering, etc. The numerical model of system is developed by the Bond graphs method, which is widely utilized because they enable easy identification of the parameter process and consider interactions within the hydraulic system. The system model is divided into mechanical section, hydraulic section and electromagnetic section and established to analyse the dynamic performance of the system respectively. Simulations are implemented to verify the rationality of the designed system. In the end, it demonstrates that the simulations results are consistent with the pressure control law of solenoid valve, and the designed system can meet the detecting requirements of solenoid valve.
SDN Flow Entry Adaptive Timeout Mechanism based on Resource Preference
Authors: Li Ziyong , Hu Yuxiang , Zhang Xueshuai
Published: August 2019

Software-defined networking brings rich and more efficient means to network control management. However, the fixed timeout mechanism of flow entry causes the waste of flow table resources and controller computing resources. This paper proposes an SDN flow entry adaptive timeout mechanism. The mechanism allocates a suitable timeout for different flows based on the characteristics of the data flow, and dynamically adjusts idle timeout value to prevent the flow table from overflowing. The experimental results show that the proposed adaptive timeout mechanism can make full use of flow table resources and controller computing resources to achieve higher average network throughput.
Research on Power System Automation Communication Technology for Smart Grid
Authors: Chen Junsong
Published: August 2019

The development of distribution network automation is the inevitable result of electricity market and economic construction. Nowadays, both enterprises and households have put forward higher requirements for the power quality of power grid companies. This forces power companies to ensure continuous power to users, and in the event of a power outage, the normal delivery of power should be restored in the shortest possible time. Therefore, this paper designs a distribution network automation communication system, which provide the functions of data collection, data processing, remote control, distribution network analysis application, etc. It can ensure the reliability of power supply, shorten the time of power failure, and effectively improve the operation management level.
Modification Simulation Research on Handle Speed of Faucet Test System
Authors: Li Bin , Xu Jingyuan , Chen Jie , Sun Jianguo
Published: August 2019

In order to improve the accuracy and the repeatability of the faucet sensitivity test in the faucet test equipment, this paper proposes an improved scheme for adding a camera system into the rotation control device. This paper first explains the working principle of the rotation control device, then establishes and analyzes the motion model of the motor driven faucet handle rotation, and then proposes a motor speed compensation scheme based on the image processing result according to the model. The accuracy of the faucet handle speed under the compensation scheme is obviously improved.
Human Acupoint Positioning System Based on Binocular Vision
Authors: Lin Sheng , Yi Pinqiao
Published: August 2019

To realize accurate positioning and recognition of human acupoints in medical treatment, the automatic human acupoints recognition system based on computer binocular vision technology is considered by us. We studied a camera calibration method by plane calibration lattice. To verify and accurately locate human acupoints in medical treatment, the method adopted the principle of binocular vision technology to collect different images of human body limbs to obtain three-dimensional coordinates of space, and the positioning errors of each marker point measured by binocular vision calculation and three-dimensional coordinate measuring instrument are compared. The results show that the system can assist medical personnel to complete the human acupoints recognition and positioning, and respond to the needs of the clinical application.
A survey of industrial control system testbeds
Authors: Geng Yangyang , Wang Yi , Liu Wenwen , Wei Qiang , Liu Ke , Wu Haolan
Published: August 2019

Industrial Control System(ICS) testbed is the basis of ICS safety research. In order to build an ICS testbed, it is necessary to have a deep understanding of the current research status. This paper introduced the structure and composition of the typical ICS system. Then it simply analyzed the technical characteristics, system framework and advantages and disadvantages of four types of typical ICS testbeds. Finally, it summarized application scenarios of ICS testbed and pointed out some problems in testbed construction and the development direction of ICS testbed with the fusion of cyber and physical.
A Design of Water Cannon Control System with Remote Control Function and Automatic Mode
Authors: Jin Yucheng , Zang Chunhua
Published: August 2019

Traditional manual fire-fighting water cannons cost much physical strength to operate due to its own weight and lasting fire-fighting process. In order to reduce the physical stress of firefighters and ensure their safety, a remote control system for water cannons based on STM32 using freeRTOS is introduced in this paper. It has both manual mode and automatic mode with distance of remote control over 250 meters. Power consumption performance has been additionally optimized to extend the standby time considering it’s battery-powered.
Cryptanalysis of A Mutual Authentication Scheme for Smart Healthcare Systems under Global Mobility Networks Notion
Authors: Yang Shuying , Xu Chengbo
Published: August 2019

Authentication and key agreement scheme is an important mechanism for legal users to access the services of smart healthcare systems under global mobility networks notion. However, the design of authentication and key agreement schemes is still quite a challenging problem. In this paper, we analyse a novel mutual authentication scheme for smart healthcare systems under global mobility networks notion proposed by Wu et al. in 2018, and point out the scheme is vulnerable to malicious user impersonation attack, offline guessing attack and suffers from low efficiency.
Short-term Load Forecasting Based on Electricity Price in LSTM in Power Grid
Authors: Cai Ruyi , Li Shixin , Tian Jiecai , Ren Liqiang
Published: August 2019

In the electricity market, accurate short-term load forecasting can ensure the safe and stable operation of the grid, but the real-time fluctuation of electricity price increases the complexity of load changes and increases the difficulty of forecasting. In response to this problem, this paper studies the correlation between electricity price and power load, and provides a basis for the prediction of short-term load in the active distribution network. Based on the correlation between electricity price and power load, this paper proposes a short-term load forecasting model for long-term and short-term memory-cycle neural networks. Taking the power data of a certain area as an example, the LSTM model and other models were used to carry out simulation experiments. The results show that the proposed method outperforms other models in terms of prediction accuracy and stability.
Forecast and Application of GA Optimization BP Neural Network Tourism Demand in High-speed Railway Era
Authors: Wang Meiyu , Zhang Han , Wu Zhongjun
Published: August 2019

The arrival of the high-speed rail era has profoundly affected China’s tourism demand, making it towards uncertainty, and traditional tourism demand forecasting methods need to be innovated. Using Matlab (2014a) to construct a BP neural network model based on genetic algorithm (GA) optimization, taking the number of tourists and tourism income of Sanjiang Dong Autonomous County in Guangxi as sample data, the model is trained repeatedly, and the number of tourists and tourism income are predicted and analyzed, and the model is applied to the forecast of tourism demand in the era of high-speed railway. The example simulation results show that the GA-optimized BP neural network model in the high-speed rail era has better adaptability and prediction accuracy in tourism demand.
Modeling of intelligent distribution network self-healing control state transition based on FSM
Authors: Hao Binbin , Tang Minan , Yu Fan , Xu Xiyuan
Published: August 2019

In order to realize effective prevention from faults, cut-off the fault quickly and power supply recovery from power loss load in intelligent distribution network, this paper proposed a state transition model of self-healing control for intelligent distribution network based on Finite State Machine (FSM). We divided the running states into normal state and fault state, added finite variables to FSM. determined the operation state transition control schemes of intelligent distribution network self-healing control. Considering distributed generation(DG), we established the state transition model of intelligent distribution network self-healing control system on Matlab/Stateflow platform and applied to simulation example. The results show that the proposed state transition scheme is feasible and effective.
Vehicle Target Tracking Method for Crooked Roads Based on UKF and Sensor Fusion
Authors: Li Lifu , Zhang Wenying , Liang Yi , Zhou Hui
Published: August 2019

Aiming at the problem that mm-wave radar tracking target is easy to lose when in crooked roads, a vehicle target tracking method based on Unscented Kalman Filter (UKF) and sensor fusion is proposed. This method uses mm-wave radar and camera to obtain vehicle targets’ information in crooked roads at the same time. Then, according to whether mm-wave radar tracking target is lost or not, different tracking methods based on UKF are adopted. When the mm-wave radar tracking target is not lost, the historical and current data information of mm-wave radar are taken as the state information and measurement information, directly calculating the tracking vehicle parameters such as position, distance and speed; When the mm-wave radar tracking target is lost, a sensor fusion strategy is adopted. The historical data information of mm-wave radar is still the state information, and the camera vision image information of the tracking target becomes the measurement information, integrating the two sensors’ information to get the tracking vehicle parameters. And the result will serve as next moment’s state information for continuous tracking to solve the mm-wave radar tracking target loss problem in crooked roads. Finally, the validity of this method is verified by real road experiments.
Task Scheduling in Graphic Processing Units Heterogeneous With Density of The Graph
Authors: Wang Xuecheng , Ma Jinquan , Yue Chunsheng , Yang Di
Published: August 2019

An efficient scheduling algorithm is significant to achieve high performance in heterogeneous consisted by the central processing units (CPU) and the graphic processing unit (GPU). However, most of the scheduling algorithms are not suitable to meet the present demands of the heterogeneous. According to the characteristics of the direction acyclic graph, the direction acyclic graph nodes density list scheduling algorithm (DAG-NDLS) was proposed. The algorithm had two important phase, the first phase was task prioritizing, selected the ready task with highest priority, defined by the summation of the node density and the transmission between the node and child nodes, and the second phase was processor selection, selected the processors for the tasks with the earliest finish time minimum. In the end, compared the performances of the proposed algorithm with the heterogeneous earlier finish time algorithm and the high performance task scheduling algorithm, the results of the proposed algorithm were the best in case of the efficiency and utilization.