bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on the Effects of Nonsmooth Surfaces on Backward-facing Step Flow
Authors: Zhang Mingxiao , Song Xiaowen 
Published: November 2019

Abstract
To achieve the purpose of backward-facing step flow control, a passive control approach, which consists in introducing nonsmooth structures in solid walls, is applied to the upstream of the backward-facing step. Based on STAR CCM+ software, the standard k-ε turbulence model was established to simulate flow characteristics of the right angle step, fillet step and nonsmooth fillet step. The introduction of the nonsmooth surface leads to a significant reduction in recirculation region length (17.5%) and a decrease in downstream wall pressure coefficient. According to the analysis of separation point position and turbulent kinetic energy, the delay of separation point and the enhancement of momentum exchange are the main reasons for the success of flow control. Compared with the right angle step, the delay of flow separation of the fillet step leads to a reduction in step expansion ratio (ER), and the existence of the nonsmooth structure enhances the turbulent kinetic energy at the fluid separation points and the momentum mixing at the downstream of the step, thus reducing the reattachment length and the downstream wall pressure coefficient.
Topology optimization of truss support systems for a point- supported glass curtain wall based on truss-like continua
Authors: Cui Hao , Zhou Kemin 
Published: November 2019

Abstract
Steel truss structures for point-supported glass curtain walls with a web member configuration are presented using topology optimization based on truss-like continua. The initial structure comprises chords and partial web members. The initial design domain, surrounded by the members of the initial structure, is filled with a truss-like continuum, which is used to simulate the distributive web members of a steel truss. The structure members, together with the truss-like continuum, are analysed and calculated under horizontal point forces. The densities and orientations of the truss-like members at every node are taken as design variables and optimized. The members in the truss-like continuum are optimized using the fully stressed criterion. The topology optimization problem of minimum compliance with volume constraints is solved. Thus, an optimal web member configuration that suitably reinforces the lateral stiffness of the structure is obtained.
Numerical Analysis of the Influence of Atmospheric Plasma Gun Structure on Plasma Flow
Authors: Tan Chao , Tao Li 
Published: November 2019

Abstract
To investigate the gun structure influence on gas flow characteristics during plasma spraying process, a simplified 3-D computing model was developed to calculate the multi-physical properties of the gun. The geometric model included cathode and anode, and electrodes boundary layers. Besides the temperature of ions and electrons was treated separately. In other words, the model used a two-temperature plasma model, which took into account ionization and recombination reactions of ions and electrons, the plasma flow inside the spray gun was studied. From the calculation results, decreasing of gun throat diameter caused the increase of velocity and decreasing of temperature. The change of velocity behaved a linear relationship with diameters, while temperature decreasing slowed down when the diameters reached a certain value. The research will provide theoretical guidance for the optimal design of spray gun.
Improved IGBT Dynamic Model and Electro-Thermal-Mechanical Multi-Field Coupling Failure Analysis
Authors: Zhou Jianbo , He Yigang , Liu Jiacheng , Ni Huadong , Peng Zhangsheng 
Published: November 2019

Abstract
Failure of insulated gate bipolar transistors (IGBTs) can make a serious impact on the entire rectification or inverter system. IGBTs are used in different practical applications, causing a large difference in the form of failure of its solder layer. Therefore, it is necessary to study the aging failure law of IGBT solder layer. Firstly, the improved IGBT dynamic model is used to build a three-phase rectifier circuit and correct its circuit power consumption error. Then constructing three-dimensional finite element model of IGBT and analyzing its chip temperature and solder layer stress distribution under electro-thermal-force multiphysics coupling. Finally, the randomly generated solder layer defects are used to investigate the effects of voids, cracks, etc. on solder layer failure, and the aging failure mechanism of the solder layer is obtained. The simulation results show that after the solder layer defect area ratio is higher than 15%, solder layer voids, cracks and shedding have a significant effect on chip junction temperature and solder layer stress. Among them, shedding and cracks have a greater influence on the stress of the solder layer.
Design of Power Converter for Aluminum Air Battery
Authors: LI Xunda , Wang Yuhua , HE Hongbo , LI Gang , Liu Weiming , Zhang Shuxiong 
Published: November 2019

Abstract
In order to improve the output voltage performance of the aluminum air battery and improve the conversion efficiency, according to the output voltage characteristics of the aluminum air battery pack, we propose an LLC resonant converter based on integral separation PID control and voltage feedforward control. Then the main parameters of the converter were designed and finally simulated by MATLAB/Simulink. The experiment proves that the control method adopted by the aluminum air battery converter effectively improves the dynamic performance index of the system compared with the conventional PID control.
DOUBLE WINDING TRANSFORMER ARTIFICIAL INTELLIGENCE VOLTAGE REGULATION COMPENSATION ALGORITHM
Authors: Sheng Zhong 
Published: November 2019

Abstract
To solve the current double-winding transformer voltage regulation effect is not good, and so on, put forward the double-winding transformer artificial intelligence voltage regulation compensation algorithm. Based on double winding transformer voltage regulation control method and the configuration parameters optimization, reasonable setting standards regulating parameters of artificial intelligence, in order to guarantee the accuracy of the pressure regulating compensation, combined with the optimization allocation algorithm of artificial intelligence pressure regulating compensation standard parameters setting, so as to complete the double winding transformer voltage regulation compensation algorithm of artificial intelligence research. Finally, it is proved by the experiment that the algorithm of artificial intelligence voltage regulation compensation of double-winding transformer can restrain voltage harmonics effectively and guarantee the voltage regulation compensation effect of artificial intelligence of transformer.
Comparative Analysis of Inventory Compilation Methods for Ship Emissions
Authors: Li Yue , Li Mingjun , Cheng Jinxiang , Wang Renjie , Xu Honglei , Zheng Chaohui 
Published: November 2019

Abstract
In recent years, a variety of inventory compilation methodologies have been developed for ship emissions. With a detailed comparative analysis of the 5 major methods on applicability scope, calculation difficulty, accuracy, time and space distribution etc., this paper aims to be of reference for the selection of the most appropriate approach to emission inventory compilation.
Multi-objective disassembly sequence optimization aiming at quality uncertainty of end-of-life product
Authors: Li Shengqiang , Zhang Hua , Yan Wei , Jiang Zhigang , Wang Han , Wei Weijie 
Published: November 2019

Abstract
Remanufacturing plays a vital role in circular economy due to its enormous contribution in promoting resources recycling and utilizing. Disassembly of end of life (EOL) products, as a prerequisite of remanufacturing, is an effective means to improve resource utilization and reduce environmental impact. However, because of the complex quality conditions of EOL products, different disassembly method and sequence for components may lead to different effects. Based on this, a multi-objective disassembly sequence optimization model considering the quality uncertainty of EOL products is proposed in this paper. Firstly, remaining life of each component of an EOL product is calculated by using the Weibull distribution and artificial neural networks (ANN), and then the disassembly modes could be chosen according to their quality conditions. Secondly, a multi-objective disassembly sequence optimization model which takes minimum disassembly time and cost as the objective is established, and the particle swarm optimization (PSO) algorithm is employed to solve this model. Finally, a case study of drum washing machine disassembly is provided to verify the feasibility and superiority of the proposed methodology.
Analysis of Influencing Factors and Experimental Study on Properties of Laser Cladding Layer
Authors: Cui W H , Wang H , Shao D Q , Han B , Lin J Y 
Published: November 2019

Abstract
Laser cladding is an additive manufacturing or surface modification technique for parts. The quality of cladding layer is the key to determine the performance of cladding parts. The influence of pretreatment and post-treatment on the quality of cladding layer is analyzed. Through the experiment, the pretreatment process suitable for small, medium and large automobile moulds is explored. The effects of laser power, scanning speed, powder feeding speed and defocusing amount on the morphology, quality and property of the cladding layer were studied. With 45 steel material as the substrate and Fe15Cr1.9Ni1.2B1.23Si0.55Mo0.24C as cladding material to manufacture laser surface cladding. The samples with 50% cladding layer are made and the tensile tests are carried out. The mechanical properties of metallurgical bonding layer and cladding layer between matrix and cladding layer were studied, and the cladding quality of laser cladding of ferroalloy was explored.The test results are as follows: After laser cladding of 45 steel matrix, the metallurgical combination of matrix and cladding layer is good, the tensile strength of the metallurgical binding layer and cladding layer is greater than the tensile strength of the substrate.
The optimum design of the flapping-wing mechanism
Authors: Yafeng Zhang , chunming Yu , Xvhui Zhang , Liang Yao , Jvxin Qu 
Published: November 2019

Abstract
This paper presented a numerical model of flapping-wing mechanism and optimized mechanism parameters by genetic algorithm. The result of optimization shows right-and-eft asymmetry of mechanism motion was greatly reduced to 17.07% of initial mechanism. The right-and-left asymmetry of wing motion of flapping-wing was greatly improved. It proves the feasibility and veracity of genetic algorithm applied on optimization design of flapping mechanism.
Fluid Storage Structure Optimization Based on Fluid-Solid Coupling Analysis and Response Surface Method
Authors: Bao Shigang , Jiang Cuixiang , Ding Junyan , Hu Wenwen 
Published: November 2019

Abstract
The optimal structure parameters of the reservoir structure are investigated in this work. Based on bidirectional fluid-solid coupling analysis, a design of experiments (DOE) using the Latin hypercube sampling (LHS) is employed to build the response surface model of the reservoir structure. Response surface models have been shown to have good fitness. Multi-objective genetic algorithm (MOGA) is presented to search a precisely Pareto-optimal frontier for the problem. Numerical results show that the optimization method based on response surface model and response surface method can effectively overcome the limitations of experience dependence and obtain most efficient solutions for the problem. Through the optimization, the weight of the reservoir structure is reduced by 16.4% while the strength and stiffness of the structure has a little change.
Research on Talent Ecosystem of High-end Equipment Manufacturing Industry in Zhenjiang High-tech Zone
Authors: Li Xinying 
Published: November 2019

Abstract
Aiming at the talent ecosystem of high-end equipment manufacturing industry in Zhenjiang High-tech Zone, studies the mechanism and law of interaction between talent and talent environment from the perspective of ecology. Applies the theory of talent ecosystem to the practice of talent development in high-tech zone, establishes the talent ecosystem of high-end equipment industry in Zhenjiang High-tech Zone from the perspective of ecology, finds and solves the problem of high-tech. The problems existing in the talent system in the region provide new solutions for the construction of high-level talent system in high-tech zones, provide talent support and intellectual support for the promotion of high-quality development in Zhenjiang.
Stability analysis of Hoist Vertical Shiplift chamber under pitching motion
Authors: Lang Shi , Yang Zhang , Hao Chengxiong , Ji Zhou , Wei Shiduan , Re Xia 
Published: November 2019

Abstract
Aiming at the stability problem of large Hoist Vertical Shiplift chamber under pitching motion. A fluid dynamic model based on the Housner theory is built to study the sloshing in the ship chamber. The theoretical formulas of the capsizing moments are derived to research the effect of sloshing. To study the whole shiplift pitching stability, the system coupled by pitching motion, torsional vibration of main hoist and sloshing is built. Then, the critical distance of lifting points is obtained by using the Hurwitz theory. Taking seven built typical Hoist Vertical Shiplifts as examples, it is verified that the expression about the critical distance of lifting points is rational. The calculation results show that the sloshing in the ship chamber and the capsizing moment produced by the convective pressure acting on the sidewall of ship chamber could not be neglected in the design of the Hoist Vertical Shiplift. According to the successful experience of the Hoist Vertical Shiplift, it is suggested that the safety factor S of the shiplift under pitching motion should be more than 1.5.
Research on Improvement Measure of Fast Fault Point Transfer Technology
Authors: Qi Zheng , Diao Chunyan , Zheng Yuhang 
Published: November 2019

Abstract
The fast fault point transfer technology has been widely used in China. Aimed at the single-phase arc-grounding fault in the neutral point non-effective grounding system, the principle is to suppress arc re-burning by grounding the faulty phase bus directly to limit the voltage of fault phase. However, the on-site operation found that the technology could not guarantee the arc on the fault point extinguished reliably. The effects of arc characteristics, bus grounding time, impedance of lines, load current and transition resistance on arc extinguishing are analysed in depth. Among these factors, the grounding time is the only controllable factor. The improvement measure of grounding the faulty phase bus at the zero point of the arc current is proposed, and the hardware and software flow are designed. The proposed method was simulated and analysed by ATP software. The simulation results verified the reliability and accuracy of the proposed method.
Dynamic Modeling and Attitude Control System of Underactuated Fuel Slosh with Flexible Appendages
Authors: Hussein Mokhtar , Qian Longjun 
Published: November 2019

Abstract
This paper investigates the dynamics and attitude control of the pitching motion of an axisymmetric liquid-filled satellite with flexible appendages under the conditions of zero gravity and constant thrust (fixed axial acceleration). Using Lagrange method, the dynamics model of the flexible liquid-filled satellite is established. The flexible appendages are considered as Euler–Bernoulli beams, and the sloshing liquid is modeled as a spring-mass model. Considering the motion of the satellite in the orbit plane and pitching attitude motion, a sliding mode controller is designed by decoupling the satellite dynamics equation into a typical underactuated system. The influence of the vibration of flexible appendages and the slosh of liquid fuel on the attitude control of the spacecraft is considered. The results show that the designed controller can effectively suppress the liquid sloshing and the vibration of the flexible appendages in such a manner as to achieve the desired result and control target.
Performance analysis on an in-service escalator driving chain
Authors: Ren Facai , Liu Xiaochang , Liang Xiao , Wu Xinghua 
Published: November 2019

Abstract
The performances of an in-service escalator driving chain were investigated. The tensile properties were analyzed by conducting tensile tests. The chain plate was investigated based on the optical microscope and scanning electron microscope analysis. The results show that the surface of the outer chain plate has poor and decarbonized phenomena.
Research on Power Grid Environmental Protection Management Information System Based on Time Series Characteristic
Authors: Dan Yang , Jinyang Li , Rui Li , Shimeng Dai , Ning Luo 
Published: November 2019

Abstract
With the continuous improvement of the voltage level of power system and the continuous expansion of the scale of power grid, the problem that the environmental protection information data of power grid is single and can not be centralized analyzed and utilized is highlighted. It is necessary to strengthen the construction of information management for power grid environmental protection. The time series characteristic is an orderly set of elements composed of the recorded value of a physical quantity and the time node. Through the time series characteristic, it provides data query, analysis and transmission line electromagnetic environment parameter prediction function for power company, provides the basis for power grid environmental protection management and technical supervision and monitoring, and realizes the electronic management of power grid environmental protection information system.Real-time monitoring of electromagnetic environment parameters of power transmission and transformation lines, providing technical support and data support for the formulation of environmental protection policies and solving environmental disputes, and realizing information management of power grid environmental protection. It is convenient and quick to increase the grid environment monitoring node, and the networking is flexible and simple; the monitoring center has a friendly interface, which can realize multi-point control of a large number of terminals.
Current situation and prospect of air pollutant emission standards for ships
Authors: Li Mingjun , Li Yue , Cheng Jinxiang , Xu Honglei 
Published: November 2019

Abstract
The emission limits and measurement methods of pollutants from ship engines (China’s first and second stages) implemented on July 1, 2018 (GB15097-2016) marked the initial establishment of China’s ship air pollutant emission standard system. Based on the study of the development of China’s ship air pollutant emission standards, this paper analyzes the applicable ships and the types of pollutants controlled by China’s ship air pollutant emission standards system, and puts forward some suggestions to improve China’s ship air pollutant emission standards system.
Study of wind-solar complementary power system in zhongshan station of antarctic
Authors: Zhang Ling , Dou Yinke 
Published: November 2019

Abstract
Due to the environmental and transportation problems caused by conventional diesel power supply of the Antarctic Zhongshan Station,the wind-solar complementary power generation technology can not only guarantee the power supply demand but also protected the environment of the polar regions.Combined with the meteorological data of the Antarctic Zhongshan station and the data of the load electricity consumption,the system energy matching calculation is carried out,which shows that the wind-solar complementary power generation system can meet the load demand of the Antarctic Zhongshan station.Aiming at the extreme polar day-night phenomena and the perennial low-temperature environment,the energy management scheme in Antarctic Zhongshan station are proposed and a Maximum Power Point Tracking control strategy simulation experiment is carried out,the simulation results verify the feasibility of the control strategy.
Development and Application of Foreign objects Removal Device for High Voltage Transmission Line
Authors: Liang Yuhe , Yang Feng 
Published: November 2019

Abstract
This paper presents a device for removing foreign objects on high-voltage transmission lines in the power system.The device aims to solve current difficulties including high labor density and low success rate.Firstly, the main functional components of the foreign object removal device are analyzed, then the design innovation points and the key technology of the device are proposed. Besides, the device has been applied to the actual work site of power transmission line maintenance for the field test and data analysis. Experimental result demonstrates that it has lower labor intensity, remarkable social benefit and economic effect.
A Scheme for Image Encryption And Decryption of Chaotic System Based on memristors
Authors: Hua Honghu , Zhu Xi , Liu Haijun 
Published: November 2019

Abstract
In this paper, a scheme for image encryption and descryption of chaotic system based on memristors has been proposed. A memristor-based chaotic circuit is simulated and demonstrated it has chaotic characteristics. Then, a memristor-based XOR operation is introduced. At last, image encryption and decryption is presented based on these two structures. Simulation results indicate that chaotic system consisting of memristor-based chaotic circuit and memristor-based XOR operator can achieve image encryption and decryption.
A Method for Anti-electric Theft Based on User Electricity Load Forecasting and Historical Load Data
Authors: Zhang Zhi , Dong Xianguang , Liang Bo , Dai Yanjie , Chen Zhiru , Wang Pingxin 
Published: November 2019

Abstract
With the development of socioeconomic and the increasing demand for electricity, the electricity safety requirements are getting higher and higher and the importance of anti-electric theft has become increasingly prominent. At present, the phenomenon of electric theft is frequent, but the quality of relevant inspectors and related technologies are inadequate in identifying electricity stealing. In view of the above problems, this paper proposes a new method for anti-electric theft, which can predict the load of users. User load forecasting curve is formed[1], and combined with user history data, user forecasting load curve and industry load characteristic data, logistic regression algorithm is used to establish user electric theft judgment model and judge the possibility of user electric theft . The experimental results on the relevant datasets show that the proposed algorithm has a good effect.
Calibration for Axis Misalignment Angles between Photoelectric and Inertial Navigation System of Integrated Landing Navigation System
Authors: Zheng Hang , Wang Wei 
Published: November 2019

Abstract
Aiming at the photoelectric/inertial integrated landing navigation system, this paper proposes a calibration scheme for the axis misalignment angles between photoelectric and inertial navigation system. This paper expounds the calibration scheme, analyzes the influence of various error factors on the calibration accuracy in detail, and gives the computer simulation results. The simulation results show that the calibration accuracy of pitch misalignment angle is better than 30″, the calibration accuracy of azimuth misalignment angle is better than 85″. Therefore, this scheme meets the application requirements of integrated landing navigation system.