bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on critical speed of three-watt tilting pad bearing-rotor system
Authors: Kongxing Ding , Faxin Zhu , Xianbin Teng , Qijiang Yang , Wenxiang Chen , Zhaojian Wang , Ming Chen 
Published: June 2021

Abstract
By establishing the model of three-watt tilting tile bearing and rotor system and studying the critical speed of three-watt tilting tile bearing and rotor system, the factors affecting its critical speed are obtained. The oil film stiffness coefficient and damping coefficient of sliding bearing and the mass of the counterweight plate added in the mixed bearing supporting rotor system all have a certain influence on the overall critical speed of the system. In this paper, a rotor model was established using DyRobes rotor dynamics analysis software. The critical rotational speed of the three-watt tilting tile bearing/rotor system was investigated by means of the oil film stiffness of the three-watt tilting tile bearing at different rotational speeds and changing the weight of the counterweight plate.
Application of Hydraulic Transmission Technology in Mechanical Manufacturing and Practice of Leakage Control
Authors: Shen Shiying 
Published: June 2021

Abstract
With the continuous development of the machinery manufacturing industry, people’s application requirements and standards for technology are gradually increasing. Many researchers have begun to pay attention to hydraulic transmission technology in machinery manufacturing to avoid new troubles for the development of the entire industry. This article summarizes the application content of hydraulic transmission technology in machinery manufacturing based on previous work experience. The author discusses the leakage control measures of the hydraulic transmission system from four aspects: controlling the leakage of the hydraulic system, strengthening the control of the original seal, controlling the oil pollution, and reducing the shock and vibration probability of the equipment.
Research on the course, form and strategy of autonomous driving competition
Authors: Yang Fenghua 
Published: June 2021

Abstract
Autonomous driving is the future development trend, which will greatly change the way human beings appear and the form of entertainment. Based on the background of the rapid development of autonomous driving technology, this article summarizes the development status of autonomous driving competitions at home and abroad, analyzes the integration of the motorsport industry and the autonomous driving industry, and proposes strategies to promote autonomous driving racing events.
The Design of Automatic Carton Packing System of Tobacco Based on STM32
Authors: Zhai Yuyi , Wang Le , Liu Yunjia , Jiang Tao , Jiang Houyong 
Published: June 2021

Abstract
This article is aimed at the requirements of a cigarette factory’s off-site technical transformation task, and it needs to transfer part of the stem and expanded silk produced by the new factory to the old factory. Therefore, it is necessary to construct a set of fully automatic carton packing system for shredded tobacco to improve production efficiency and reduce labor intensity. The system is divided into mechanical equipment layer, equipment control layer and production monitoring layer. The mechanical equipment layer is the design of the process flow between the various machinery and equipment of the tobacco packing production line; the equipment control layer is based on the STMicroelectronics32(STM32) single-chip microcomputer as the control core, through Modbus The protocol controls each device and performs data transmission, and communicates with the upper computer through the industrial Ethernet and Modbus Transmission Control Protocol(Modbu TCP) protocol; the production monitoring layer is based on the Qt programming tool for interface design and data transmission with the lower computer, and the relevant data is stored in My Structured Query Language (MySQL) In the database. This solution realizes the automation, networking and intelligence of industrial production lines, liberating manpower and improving efficiency.
Design of millimeter-wave chipless tag based on variable angle arc resonator
Authors: Zhang Qianglin , Zou Chuanyun , Jiao Liangyu 
Published: June 2021

Abstract
Faced with the development of miniaturization and compactness of chipless radio frequency identification (RFID) tags, and to reduce the cost of traditional chip tags, this paper proposes a miniaturized, polarization-insensitive, passive, and chipless based on a variable-angle arc resonator. Chipless tags have a high coding density of 44.44 bits/cm2 in the frequency range of 20GHz∼31GHz, and a coding capacity of 4.04 bits/cm2/GHz. The patch on the substrate determines the signature of each resonant frequency, thereby determining the number of identification data bits. To accommodate more data bits and pass barriers between resonant features, the metal patches are orthogonally polarized so that adjacent resonant features will not interfere with each other. As the mm-Waves ultra-wideband (UWB) chipless tags, it can be easily printed on various IoT applications and has great potential for low cost and identity verification. This work makes it easier to implement highly robust, inexpensive, and flexible chipless tags for IoT applications in the mm-Wave band.
Research on a course control strategy for unmanned surface vessel
Authors: Luo Zhigang , Qian Tonghui , Ye Xi , Huang Jiahui , Yu Linwen 
Published: June 2021

Abstract
With the development of intelligent control and modern communication technology, Unmanned Surface Vessel (USV) will soon become another important unmanned platform after drones and unmanned vehicles. Unmanned vessel are easily disturbed by wind, waves and currents during navigation. Solving the problem of unmanned vessel’s course keeping control during navigation has become one of the key technologies in the research of unmanned vessel. Aiming at the course control problem of the unmanned vessel in the course of navigation, this paper firstly carried out mathematical modeling and data analysis on the dynamic model of the experimental unmanned vessel, carried out related design simulations and experiments through the constructed model, and propose an optimal control strategy based on PID controller. On this basis, the accuracy and effectiveness of the control strategy proposed in this paper are verified through a simulation platform, which can ensure the course stability of the unmanned vessel during the navigation process. Key technologies such as UAV obstacle avoidance and coordination provide a theoretical basis.
Control Methods for Quadrotor’s Stability
Authors: Pang Shengyuan , Tian Linzhe 
Published: June 2021

Abstract
Quadrotor unmanned aerial vehicle (UAV) has become more and more popular due to its high maneuverability, vertical take-off, landing and hovering capability, and ease of operation. However, it is subject to various disturbances during the flight, such as turbulence. This paper provides a comprehensive survey of control methods proposed for quadrotor stability. According to the relationship between the controller and the controlled model, this paper divides the quadrotor stability control methods into three categories, namely classical control, optimal control, and intelligent control, for detailed discussion.
Research on Automatic Test Method of Radio Block Center Based on Script Technology
Authors: Zhao Jingjing , Zheng Wei 
Published: June 2021

Abstract
Radio Block Center (RBC) is the wayside core equipment of high-speed railway train control system, which is the key to achieve the safe operation of trains. In order to ensure the correctness of the function of RBC equipment and to send movement authority information to the train correctly, it is necessary to verify the consistency of RBC function with the RBC requirement specification. Therefore, the RBC functional testing is the basis and key to ensure the safety of train operation. The execution of testing cases has a great impact on testing efficiency. How to automatically execute testing cases and fully cover the system specifications is the key issue of RBC functional testing. Aiming at the shortcomings of traditional RBC functional testing, such as low efficiency, long time consuming, huge workload, and low accuracy of fault simulation, by studying the preparation of automatic test environment and the execution of automatic testing cases, this paper proposes a script based automatic functional testing method, and takes the RBC functional testing as an example to verify the correctness and effectiveness of this method. The practical application shows that the description ability of the test script language and the automatic testing environment meet the RBC testing requirements. The timeliness and the safety of RBC functional testing can be improved by using this method.
Characteristics, Connotation and Military Application of Additive Remanufacturing Technology
Authors: Yimeng Fang , Wenhua Wei , Xun Gong , Yadong Li , Xiaozhou Zhao , Qingyan Ma , Tao Xu , Shijun Ni , Zunwu Zhang , Xin Tian 
Published: June 2021

Abstract
This paper analyzes the intelligent and digital trend of remanufacturing industry, discusses the connotation and characteristics of additive remanufacturing technology, compares and analyzes the application status and application technology of additive remanufacturing technology in China’s military industry, points out that additive remanufacturing technology has broad application prospects in national defense science and technology, and brings higher military and economic benefits.
Study on Dry-ice Particle Jet Assisted Decontamination Technology
Authors: Feng Xu , Pan Weihao , Wang Yuhui , Fang Peng , Xing Yingjie , Chen Yang , Song Jinlong 
Published: June 2021

Abstract
Dry-ice particle jet technology, which has the characteristics of no pollution, easy production and high impact, has been widely used in the cleaning of automobile, aviation, printing, electronics and nuclear industry. In this paper, a set of dry-ice jet spraying decontamination device was built. Two types of artificial pollutants, paint and oil contamination were smeared onto the workpieces. The effect of dry-ice particle jet spraying on the paint and the oil contamination was studied comprehensively. In addition, the wettability of the workpieces before and after dry-ice particle jet spraying was tested. The results of this study enrich the technology of industrial cleaning and promote the practical applications of the dry-ice particle jet spraying technology.
Producing various shafts by novel flexible skew rolling in multiple-freedom mill
Authors: Lin Longfei , Wang Baoyu , Shi Jiaai , Ju Zhidong , Wang Jiapeng 
Published: June 2021

Abstract
This paper presents a new method in shafts manufacturing including flexible skew rolling process (FSR), multiple-freedom mill (DRM-80) and a new type of roller, by which can produce various shafts with same rollers via programming different movements. In order to explore industrial application, four typical shafts — preforms of valve and railfrog, the shafts of truck and train were produced in FSR experiments, and their forming defects were summarized and presented.
Study of critical suspension speed of impeller in two paddles stirred kettle
Authors: Chen Yingwu , Xu Hong , Xu Peng , Ren Yanlun 
Published: June 2021

Abstract
Experiments and numerical simulations were used to study the two-layer paddle stirring system. Glass bead particles and aqueous polyvinyl alcohol solution were used as the solid-liquid phases, and the variation of the critical suspension speed of impeller Njs under different parameters was analyzed by testing the parameters of liquid phase viscosity, solid phase particle size, and solid-phase mass fraction. The results showed that the main resistance (surface viscous resistance) increased with the increase of liquid-phase viscosity at particle size d=0.3 and d=0.5 mm, and this factor inhibited the solid-phase diffusion, resulting in an increasing trend of Njs with the increase of liquid-phase viscosity. At particle size d=0.8 and d=1mm, the main resistance (gravity) is not related to the liquid phase viscosity, and the intensity of turbulent pulsation in the kettle is enhanced with the increase of liquid phase viscosity, which is favorable to the solid phase diffusion, and Njs decreases with the increase of liquid phase viscosity. The increase in solid-phase volume fraction increases Njs.
Research on simulation platform of intelligent production lines
Authors: Wang Qinghua , Hu Yanhua , Fu Renxuan , Ma Xinzhou 
Published: June 2021

Abstract
In order to improve the ability of teachers and students to comprehensively apply intelligent production line technology, this paper provides an intelligent production line simulation method and system, which can simulate the operation of intelligent production line, and is easy to control and has lower cost, so as to meet the teaching needs of cultivating intelligent production line application talents. This paper introduces the development technology and implementation method of intelligent production line based on C language of single chip microcomputer.
Design of multi-magnetic couple MR damper with full channel effective damping
Authors: Zhu Yurui , Wang Qun , Ma Jichao , Tang Zhanghong , Yu Yunfei , Li Yongqing 
Published: June 2021

Abstract
A multi-magnetic couple magnetorheological damper with full channel effective damping is designed. By designing the magnetic outer ring of the magnetic couple into a structure with gradual cross-sectional area, the purpose of effective damping of the full channel can be achieved, so that the entire damping channel is affected by the magnetic field. Through the magnetic circuit simulation analysis, the rationality of the design is verified, and the magnetic induction intensity on the damping channel can reach the theoretical design value, which reflects the efficient magnetic field utilization rate of the damper.
Fabric Defect Detection Method Based on Improved U-Net
Authors: Rong-qiang Liu , Ming-hui Li , Jia-chen Shi , Yi-bin Liang 
Published: June 2021

Abstract
Computer vision builds a connection between image processing and industrials, bringing modern perception to the automated industrials. At the same time, defect detection based on deep learning has played an important role in automated detection. In this paper, an improved convolutional neural network CU-Net for fabric defect detection is proposed. In this method, the classical U-Net network was improved. On the basis of network size compression, attention mechanism is introduced and a new compound loss function is used for training. Using the public AITEX defect fabric data set as the test sample, the experimental result shows that the accuracy and recall of the proposed method are 98.3% and 92.7%, respectively. Compared with the highest scores of other detection methods, they are improved by 4.8% and 2.3%, which improves the detection accuracy of fabric defect significantly.
Hybrid data assimilation based on multilayer perceptron
Authors: Lang Jialin , Qiu Feng 
Published: June 2021

Abstract
Data assimilation is widely used in weather forecasting, ocean forecasting, remote sensing observation and other fields. The result of data assimilation directly affects the accuracy of forecasting. Data assimilation algorithms have been studied extensively. The classical algorithms include 3D-Var, 4D-Var, Kalman filter and ensemble Kalman filter. New assimilation algorithms also emerge one after another. In recent years, people have tried to use a hybrid of various data assimilation methods. Deep learning is a hot research field in recent years. Deep learning is able to mine the hidden features of data for analysis and prediction. In this paper, we attempt to use the classical deep learning model-multilayer perceptron to extract the characteristics of traditional data assimilation algorithms to perform hybrid data assimilation. The experiments show that the results of this method are significantly improved compared with the traditional methods, and reveal the value of multilayer perceptron in the direction of hybrid data assimilation.
An object detection research method based on CARLA simulation
Authors: Gao Weihua , Tang Jiakai , Wang Taotao 
Published: June 2021

Abstract
At present, the research of object detection in automatic driving is mainly based on the actual automatic driving vehicle. This method is expensive, less feasible, and difficult to test. Based on CARLA, we proposed an efficient and low-cost object detection method, which can overcome the shortcomings of the actual vehicle research. In this paper, firstly, we obtained images from CARLA, and then the data set is obtained by cleaning and labeling the image. Finally, based on the data set established in this paper, we train the models of YOLOv4, CenterNet and Faster-RCNN respectively, and make a comparative study on the test set. The results show that YOLOv4 has the best detection effect without special optimization method.
Simulation and optimization design of cyclone separator for waste plastic film
Authors: Zhang Q S , Zhang Z S , Yang X H , Yang Z , Yang L Y 
Published: June 2021

Abstract
Waste plastic sorting and recycling is a kind of efficient and energy-saving way of domestic garbage treatment. In this paper, the Cyclone based Multistage Separation Process for waste plastic film is presented, and the principle and structure of cyclone separator are introduced. The fluid analysis software Fluent is used to simulate and analyze the cyclone separator of waste plastic film. The comprehensive analysis shows that the optimal wind speed of cyclone separator is 18m/s, and under this speed the separation effect of particles in cyclone separator is the best. Based on this, the cyclone separator for waste plastic film was optimized, the structure size of cyclone separator for waste plastic film with three different densities was obtained, and the calculation basis for the design and manufacture of cyclone separator for waste plastic film was provided.
Research on the Analysis Method of Engine Assembly Quality Based on Data Driven
Authors: Xin Dou , Jia-li Xu , Jia-jing Wu , Dong-ning Jia 
Published: June 2021

Abstract
In the context of the country’s vigorous development of the industrial Internet, the role of big data has become increasingly prominent. Through the mining and analysis of the value of industrial big data, the efficiency and quality of industrial production will be effectively improved. However, the current research lacks direct quantitative research on the correlation between bolt tightening position data and engine quality. Based on the data of a certain production line of Weichai, the SimpleKMeans clustering and Apriori correlation analysis model for the assembly process data and product quality of a certain type of diesel engine is constructed based on the Weka tool. The mining results of the association rule between the bolt tightening data of the eight stations and the cylinder head vibration peak data show that the cylinder head main bolts, cylinder head auxiliary bolts, camshaft gear bolts and connecting rod bolts are closely related to the cylinder head vibration data, and the confidence levels are respectively 0.78, 0.70, 0.63, 0.52. Therefore, when the engine vibration is abnormal, the tightening data of the cylinder head main bolts, cylinder head auxiliary bolts, camshaft gear bolts and connecting rod bolts are detected first to effectively improve the quality and efficiency of the assembly process.
Research and Application of Quality Control for TC4 Titanium Alloy Profile
Authors: Lei Yu , Baohong Zhang , Dongdong Li , Liangliang Tang , Bingtao Lin , Ning Xiong , Xin Huang 
Published: June 2021

Abstract
Through controlling from the source, TC4 titanium alloy profile ingot heating process surface protection technology and extrusion lubrication process, extrusion die design and manufacturing, profile straightening process, finished product heat treatment process and profile hot bending forming and other key processes have been studied in depth. Technical improvements and quality assurance measures are proposed. The surface quality, shape, size and mechanical properties of the titanium alloy profile meet the requirements of the use of TC4 titanium alloy profile parts for a certain type of launch vehicle. Ensure that the TC4 titanium alloy profile acceptance inspection process is operable. The manufacturing cost of the titanium alloy outer stringer of the launch vehicle is reduced. The quality level and reliability of TC4 titanium alloy outer stringers have been improved.
The survivability analysis and layout optimization of CODOG power system
Authors: Yang Zhang , Qian-chao Liang , Jing-biao Cai 
Published: June 2021

Abstract
The purpose of this paper is to discuss the calculation of the survivability of the CODOG power system in different layouts under the condition that the ship is hit by the simulation technology. In this paper, the impact of the weapon’s hit distribution under the guidance conditions and the layout of different main power compartments on the survivability of the CODOG power system of the ship are discussed, the fuzzy evaluation method is used to evaluate its advantages and disadvantages, and the reasons for the advantages and disadvantages are analyzed.
Study of Thermal Shock Resistance of Plasma Sprayed VW75 Alloy
Authors: Lin Bingtao , Ma Minglong , Zhang Kui , Li Yongjun , Chen Zehua , Zhang Baohong 
Published: June 2021

Abstract
The thermal shock resistance of T5-state VW75 Mg alloy after the plasma spraying was tested, the service process of material under the real environment was simulated, the reasons and mechanism for the coating shedding were revealed, and the comprehensive thermal shock resistance of alloy was acquired. The results showed that before the thermal shock test, the sample surface was flat with the gray color, and after the test was started, the coating surface was turned into white ZrO2 again. As the number of thermal cycles was increased, the black brown color started appearing on the sample surface, and the coating presented the overall shedding after the 158 cycles. The microcracks and pores in the ceramic layer and bonding layer were not developed into macrocracks yet, it could be deemed that the internal bonding at each layer was rather compact, and the coating quality was very high. The failure of thermal barrier coating occurred between the Mg alloy matrix and bonding layer, the thermal expansion coefficient varied from layer to layer of the coating, thus aggravating the interlayer thermal stress and leading to the overall shedding of coating, and in addition, the thickening of thermally grown oxidation layer was also an important cause for the shedding.
Preparation and properties of low temperature fluidity polyether polyol ester antiwear agent
Authors: Zhensheng Yang , Qiutao Song , Guohong Zhang 
Published: June 2021

Abstract
Polyether polyol ester was obtained by esterification reaction with tall oil fatty acid and propoxylated pentaerythritol, and then the viscosity was adjusted by adding a depressant, thus the diesel antiwear agent with better low temperature fluidity was obtained. The structure of the product was characterized by FTIR. The results showed that the esterification rate reached 98.9% when the reaction temperature was 190°C, the reaction time was 3.5h and the amount of catalyst was 4% of the total mass of acid alcohol. After the reaction of propoxylated pentaerythritol with tall oil fatty acid, the fluidity of the product at low temperature was significantly improved, and the product had better anti-emulsification and lubricating properties. When the addition amount was 150ug/g, the spot diameter decreased to 408μm. According to the kinetic analysis, the antiwear molecules are adsorbed to the metal surface through diffusion. On the surface of each iron atom, there are about 1.975×1010 antiwear molecules, forming a protective film with a dynamic equilibrium of adsorption-desorption, thus ensuring the lubricity of diesel oil.