bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Measuring Method of RVSM Regional Waviness
Authors: Ru Wang 
Published: December 2020

Abstract
The increased accuracy of RVSM (Reduced Vertical Separation Minimum) can increase the flight level and airspace capacity of the aircraft, optimize the route, improve the operational efficiency of the aircraft, and improve the operating efficiency of the airline. The skin waviness near the aircraft’s full static pressure probe has an important effect on RVSM. This article mainly studies several methods that can be used to measure the aircraft skin waviness, including advanced optical methods and spline curve method based on field work experience. In addition, the article also compares the advantages and disadvantages of these methods.
Different Techniques of Producing Superconducting Joints and Methods of Joints Characterization
Authors: Tan Weilun 
Published: December 2020

Abstract
In this paper, the method of producing superconducting joint will be briefly discussed. Cold press welding method, ultrasonic welding, spot welding and Thornton’s replacement method will be discussed. The characteristics of the superconducting joint are also discussed by using four probe method and IRT method.
Design and Implementation of FOD Detector for Airport Runway
Authors: Yuan Zhong-Da , Huang Guang-Hong , Liu Ming-He , Zhang Yong 
Published: December 2020

Abstract
Safety is the eternal theme of civil aviation. The flight safety of domestic civil aircraft affects the hearts of millions of people. Among the many factors that affect the flight safety of aircraft, foreign objects on the airport runway play an important role. Every year, there are many cases to remind us to guard against the significant impact of FOD on the flight safety of aircraft. In terms of FOD protection, China is still in the stage of artificial detection. On the one hand, it causes huge waste of human resources; on the other hand, it increases the probability of human error and seriously affects the flight safety of aircraft. Therefore, the current technological means can be used to detect FOD, so as to reduce the inspection omission caused by human error and protect the flight safety of the aircraft.
Structural Design and Simulation of Linear Motion Device
Authors: Sun Xuefeng , Zhao Zhe 
Published: December 2020

Abstract
Linear motion device is widely used in various industries. In this paper, a linear motion device design method is proposed for the test system with large load mass, large impact velocity and short acceleration time.
According to this paper, the design of linear motion device is explicated, the structure of linear motion device is described, and the working principle is stated. Also, the three-dimensional model design of the components in linear moving device is carried out based on UG, and the sub-structure is illuminated. The finite element simulation analysis of each part in the catapult device is carried out based on Nastran. Conclusively, the structural deformation and stress of each part of the linear motion device are obtained, verifying the feasibility of linear motion device structure design.
Effect of heat treatment on property and residual stress of cold drawn tube
Authors: Wen Jun , Fan Huiji , Jin Xin , Tang Cai 
Published: December 2020

Abstract
The change of strength, toughness and residual stress of Q690 cold-drawn tube were studied under (400˜;600)°C and heat preservation (1-3)h heat treatment. With the increase of temperature and the extension of the holding time, the strength and residual stress of the cold drawn tube gradually decreased, and the impact toughness increased first and then decreased. When holding at 550 °C for 2 hours, the impact toughness reached the highest 34.6J;the mechanical properties of cold drawn tubes were mainly affected by the reduction of internal stress and grain deformation caused by heat treatment.
Design of Vehicle Charger for Pure Electric Vehicle Based on MATLAB Simulation
Authors: Zhu Xiaqing , Kong Lingyu , Yang Xinjun , Xu Ya 
Published: December 2020

Abstract
In this paper, the basic principle of the on-board charger of electric vehicle is studied and analyzed, and the design scheme of vehicle charger with two-stage transformation structure is proposed. The former converter adopts boost active power factor correction circuit to improve power factor and reduce total harmonic distortion; the latter adopts phase shifted full bridge ZVS inverter circuit to realize electrical isolation and DC / DC conversion. According to this scheme, a 2kW vehicle charger is designed. The charging mode adopts three-stage charging method to charge lithium battery pack, and the three-stage charging is simulated. The results are consistent with the requirements of three-stage charging curve.
IGBT Heat Dissipation Design and Optimization
Authors: Fan Xinyu , Cui Hongjiang , Xu Yongsui 
Published: December 2020

Abstract
The reliable operation of IGBT (insulated gate bipolar transistor) is the key to the performance of motor control system, which directly affects the performance of the vehicle. By contacting with the surface of the radiator, the heat device rapidly transfers heat to the fin, which is then absorbed by the high-speed airflow between the fins and taken away to form a cooling channel to ensure that the heat device is always at an appropriate temperature during work. The power loss of IGBT under rated working conditions was estimated theoretically. The temperature field of the radiator under typical working conditions was simulated by ICEPAK, and the radiator was parameterized. The simulation results show that under the condition of forced cooling and heat dissipation, the optimized radiator meets the heat dissipation requirements of the motor controller.
Design and Analysis of FSC Formula Racing Car Body
Authors: Chen Ying , Zhou Jing , Su Gang , Wang Chunpeng 
Published: December 2020

Abstract
This article satisfies the design rules of the FSC College Student Formula Contest. Based on the existing frame and other relevant data, CATIA and Profili are used to select the airfoil, and draw the three-dimensional model of the body shape and aerodynamic kit A simplified model of a racing car. Using ANSYS Geometry, ICEM-CFD and fluent modules, after setting the boundary conditions, the front wing and tail wing are simulated and analyzed respectively, and the stress of the selected model and the air flow around the car are checked through fluent post-processing. Using the data shown as a reference, the simulation data of each group of car equipped with front and rear wings was analyzed to determine the design of the front and rear wings. The flow field analysis is performed on the vehicle after the selected empty set is installed, and the result is obtained, compared with the data before the installation, and a conclusion is drawn.
Study on the Determination Method of the Adsorption of Water Reducer on Cement Surface Based on Total Organic Carbon Analyzer
Authors: Wu Chuan-Deng , Shao You-Zhe , Li Ge-Li , Fang Yun-Hui 
Published: December 2020

Abstract
At present, most of the methods for testing the amount of Water-reducing admixture adsorbed on the surface of the cement particles use the total organic carbon method (TOC method), but various literatures describe the pre-treatment of the test method as ambiguous and poor operability. In view of the above problems, this paper carried out a study on the pre-treatment conditions of the test for the adsorption of Water-reducing admixture on the surface of cement particles by total organic carbon method, and explored the effects of stirring time, standing time, and standing temperature on the adsorption of Water-reducing admixture on the surface of cement particles. The study determined the pre-treatment and test conditions of the TOC method, and provided reference for the research on the adsorption behavior of the water reducer on the surface of cement particles. The correlation coefficients of the standard curve of Water-reducing admixture obtained by this method are all greater than 0.999, the relative error of the results of the 10 parallel experiments of the method is less than 0.005%, and the relative standard deviation (RSD) is 0.7706%.
Soft Measurement of Intelligent Vehicle side-slip Angle Based on Extended Kalman Filter*
Authors: Wang Yanxia , Wang Jianfeng , Yu Qiqi 
Published: December 2020

Abstract
A soft measurement method based on extended Kalman filter is proposed for the measurement of Intelligent Vehicle CG Side-slip Angle. Firstly, the nonlinear dynamic state model of intelligent vehicle is established, the state equation of Side-slip Angle is determined, and the extended Kalman soft measurement method is used for analysis. Secondly,through the establishment of a real vehicle test system, the soft measurement method of Side-slip Angle is verified under two working conditions and different vehicle speeds on the actual road. The test results show that the extended Kalman soft measurement method is reliable and accurate. The extended Kalman soft measurement method can meet the requirements of the full vehicle control system, and it has a certain value of full vehicle application research.
Effect of design parameters of custom abutment on its mechanical property based on orthogonal experiment method
Authors: Zhang Xiao , Zhang Jinyang , Chen Xianshuai , Feng Wei 
Published: December 2020

Abstract
In this paper, the custom abutment with various gingival morphology was designed by CAD software. The finite element analysis (FEA) and orthogonal experiments design L25 (56) were performed to investigate the influence of main design parameters of custom abutment on biomechanical property of implant system, including gingival height (GH), abutment angle (A), lingual height (LH), buccal height (BH), mesial height (MH) and distal height (DH). Results indicated that GH and A are the most important factors affecting the biomechanical performance of implant system, and LH, BH, MH and DH have less effect than others. The influence of custom abutment design parameters on biomechanical performance of implant system can be analyzed explicitly by the orthogonal experiment method, which offers a new method for estimating the mechanical characteristics of custom abutment.
Design and Analysis of 4LZ-8 Wheat Harvester Head
Authors: Xue Zhiyuan , Chen Xiusheng , Tang Huaizhuang , Li Mengwei 
Published: December 2020

Abstract
In this paper, the parameter design of the header of the 4LZ-8 wheat harvester is established, and the three-dimensional model of the header is established. The header frame is selected as the main analysis object. The force analysis and static analysis of the header frame are carried out to detect whether it meets the stiffness requirements. In order to reduce the loss caused by vibration during harvesting, the pre-stressed modal analysis is performed on the designed header on the basis of statics to obtain the natural frequency and main vibration mode of the header frame, and then the vibration frequency is analyzed. The results show that the probability of resonance of other parts of the header with the header frame is relatively low, which meets the requirements for use.
Design of Intelligent Farmland Environment Monitoring System Based on Wireless Sensor Network
Authors: Lou Xiaokang , Zhang Lixin , Zhang Xueyuan , Fan Jinjie , Hu xue , Li Chunzhi 
Published: December 2020

Abstract
In view of the problems of waste of water resources, high labor intensity and unscientific irrigation during farmland irrigation, and the shortcomings of ZigBee technology in the water-saving irrigation system network, such as short transmission distance, complicated network structure, and signals that are easily interfered during transmission. This paper designs a farmland environment information collection and monitoring system based on NB-IoT. The system consists of a terminal collection node, a wireless communication module and a host computer. Farmland environment monitoring system based on wireless sensor network includes wireless temperature and humidity sensor, wireless nitrogen, phosphorus and potassium sensor, Arduino MEGA development board NB-IoT communication module, gateway and Wasp mobile network, real-time collection, processing and wireless of farmland moisture data Transmission function, using NI LabVIEW software to compile the monitoring interface, real-time display of soil moisture in the form of waveform graph, and automatically control the opening and closing of the valve according to the soil moisture information. The system has flexible layout, long transmission distance, simple structure and integrated modules. It can achieve the purpose of precise irrigation and water saving, and is suitable for field planting, which has certain promotion significance.
Effect of welding sequence on residual stress and deformation of Mg alloy fillet welds
Authors: Fang Naiwen , Li Liansheng , Huang Ruisheng , Cao Hao , Xu Kaixin , Zou Jipeng 
Published: December 2020

Abstract
In order to investigate the effect of welding sequence on stress distribution and deformation of Mg alloy fillet welds, DE-GMAW modified Gaussian heat source model established by MSC. Marc software was applied to the numerical simulation analysis of welding temperature field and stress field and proved by measurement of residual stress by blind hole method. The results indicated that the deformation and residual stress were lowest according to the sequence of welding fillet welds from the head of cylinder to the end on one side first and then welding in the opposite on the other side. The trend of residual stress measurement results was consistent with numerical simulation analysis results with 10% error, which provided theoretical support for stress distribution and deformation control of Mg alloy fillet welds.
Design of 1SGL-240 type sugarcane deep-soiling soil preparation machine
Authors: Wei Lijiao , Li Ming , Ge Chang , Huang Weihua , Niu Zhaojun , Zhu Xianchong 
Published: December 2020

Abstract
Aiming at the problems of low efficiency and high energy consumption in the process of sugarcane planting, as well as the problems of soil compaction and hardening caused by tractor repeatedly entering the field and rolling sugarcane field, this paper designed a kind of combined soil preparation machine with reasonable structure and conforming to the continuous planting conditions of sugarcane field in China by optimizing the combination of key components. The tractor drives the machine into the field once, which can complete the processes of deep loosening, loosening the head of sugarcane, ridging and soil preparation. In this paper, the overall mechanism of the machine, subsoiling parts, pulling wheel, ridging mechanism and other key components are designed and analyzed, and the performance of the machine is evaluated through field test. The results showed that: the process of soil entry and subsoiling was stable, the rate of pulling out sugarcane head reached 91.2%, and all properties met the requirements of sugarcane field.
Characterization and Optimization of the Electrical Conductivity of a Semi-crystalline Conjugated Polymer PBTTT upon Doping
Authors: Wang Zifan 
Published: December 2020

Abstract
Semiconducting polymers have been investigated intensively in recent years due to its unique electronic properties and mechanical flexibility that could enable them to be used in a broad range of electronic applications. The electrical properties can be tuned and optimized via chemical doping which enable charge transfer between dopant molecules and organic materials. For each material, how processing conditions impact their electronic properties needs to be understood. Here, we use a representative semi-crystalline conjugated polymer poly(2,5-bis(3-teradecylthiophen-2-yl)thieno[3,2-b]thiophene)(PBTTT) to investigate how doping methods used, different dopant species and different thickness of polymers affect its electrical conductivity. We demonstrate that a combination of processing parameter could lead to the improved electrical conductivity of PBTTT thin film and point directions for future development of polymers with better electrical conductivity.
Research on Design Method of Safety Components in Grader Control System
Authors: Xue Yanjie , Hou Zhiqiang 
Published: December 2020

Abstract
Motor grader is one of the important equipment for modern road mechanization construction. The performance of its control system directly affects the quality after road construction. At the same time, the safety of the product is equally important as the basic attribute of the product. In order to get better product safety performance, most countries have formulated a series of standards to regulate the design process. This article introduces the design method and relevant requirements of the control system safety in the EU standards, and explains the method, model and basic process of the control system safety design using the safety components of grader control system as an example.
Dimensional Parameters Design for Flexible Cable Drive Parallel Mechanism
Authors: Liao Hongbo , Liu Kun , Zhang Xinyi , Chen Zhongkai , Yin Kun 
Published: December 2020

Abstract
In order to design the size parameters of flexible cable drive parallel mechanism quickly and accurately, a mathematical model of flexible cable drive parallel mechanism is established, and a design method of dimension parameters for flexible cable drive parallel mechanism is presented. By analyzing the kinematics and dynamics relation of the flexible cable drive parallel mechanism in the finite constraint space, the mathematical model of flexible cable drive parallel mechanism is derived, which includes the constraints of shape size, force and cable weight. The maximum effective working space of flexible cable drive parallel mechanism is calculated, and the dimension parameter value of flexible cable drive parallel mechanism is obtained. It provides the basis for fast and accurate design of key dimension parameters for flexible cable drive parallel mechanism.
On line monitoring method of forklift truck working condition based on multi sensor
Authors: Zhang Zhiqiang , Tian Jinjin , Zhan Peng 
Published: December 2020

AbstractAiming at the problems of poor timeliness and poor monitoring accuracy of domestic forklift working condition monitoring, a multi-sensor online monitoring method for forklift condition is proposed. Analyze the relevant factors that affect the status of the forklift truck, optimize the structure of the forklift truck condition monitoring platform, design the main control algorithm for forklift truck condition monitoring, and obtain the loading status and monitoring parameters of the forklift in the warehouse in real time. Status online monitoring. In order to verify the monitoring performance of this method, a comparative experiment is designed. The results show that the method in this paper can effectively shorten the monitoring delay and improve the detection accuracy, which is of great significance for the realization of network, intelligence and modularization of electric forklifts.
Failure and protection of metal equipment in Pumped Storage Power Station
Authors: Gao Yunpeng , Zhang Xuechao , Cheng Lu , Fang Wenxuan , Yun Feng 
Published: December 2020

Abstract
In order to ensure the safe and stable operation of pumped storage hydropower station equipment, it is very important to carry out regular maintenance of metal equipment. Because of the stress concentration, the stress state and the complex environment, the variable section of the turbine runner blade is easy to produce cracks, which endangers the safety of the equipment. By fully analyzing the characteristics, failure modes and causes of blade cracks, and putting forward effective detection, treatment and protection measures, cracks can be effectively prevented, which will play a key role in future equipment maintenance and repair.
Clinical mastitis detection by on-line measurements of milk yield, electrical conductivity and deep Learn
Authors: Tian Fuyang , Wang Zhonghua , Yu Sufang , Xiong Benhai , Wang Shunxi 
Published: December 2020

Abstract
Mastitis is the most common and costly disease in dairy cows since it can reduce milk yield, degrade milk quality, and increase healthcare costs. Detection of mastitis is an important part of udder-health management on dairy farms. Thus, the objective of this study is to develop a novel method for automatic on-line detection of clinical mastitis in an automatic milking system using the measurement of electrical parameters, data of milk production efficiency, and deep learning. The measurements were inputted into a neural network to calculate the mastitis detection index. The network was trained with 44 healthy and 6 clinical mastitic cows. 42 out of 44 healthy and 5 out of 6 mastitic cows were classified correctly after training. The trained neural network can predicted 164 out of 176 healthy quarters correctly in different evaluation data sets. These results were better than the results obtained with the model usually used on the farm.
Study of the Inherent Causes of Formation of Settlements Based on Satellite Map Observation
Authors: Zhou Yixin , Lv Tangjun , Wang Ruilan 
Published: December 2020

Abstract
According to legend, there are several settlements in the form of “Bagua” (also called the Eight Diagrams) in Guangdong Province of China. For a long time, the public propaganda and some scholars all consider that the construction of this type of settlement is an imitation of gossip, so-called Bagua of Tai Chi. Using satellite map observation technology, this study defined the preliminary concept of the settlements in the form of Bagua, collected the statistics of the quan-tity and location of these settlements, and gathered a description of the distribution and overall plane graph of them. Through graphic analysis and isomorphism method, it is found that iso-morphic relation exists in many ways between the distribution region of those settlements and their surrounding geographical environment.
From our viewpoint, the form of Bagua is only the external appearance of the settlements, and there are more important inherent causes of formation for them. First of all it is the defense of floods, followed by the defense of human disasters, and last but not least it is the adaption to the forms of social organization. The formation of the settlements in the form of Bagua had an ap-parent cause of defending the natural and human disasters, and it adapted the forms of social or-ganization. Then in the development of these settlements, the influences of the Bagua of Tai Chi as well as feng shui are integrated. In nature, the purpose of settlement form is to create optimal living environment.
The Road Spectrum of Combine Harvester Based on Virtual Iteration
Authors: Ming Dong Ming , Feng Lin Shu , Yao Wang Meng , Guang Hu Yao 
Published: December 2020

Abstract
The combine harvester has a complex work environment, and the reliability of the rack is critical to the functionality of the machine. In order to shorten the test time, reduce the cost of research and development, and make the road spectrum can be reproduced on the test-bed, this paper takes the combine harvester as the research object, the acceleration spectrum was measured on asphalt road, hard road in field and wheat field, and the multi-body dynamic equation was established according to the actual parameters of the vehicle. The transfer function between the tire displacement signal and the target signal is established, and the tire displacement spectrum is calculated. The road spectrum is taken as the input load of the four-column test-bed, and the actual load condition is reproduced on the test-bed, which provides the input condition for the fatigue analysis of the combine harvester rack in the later stage, and greatly enhances the efficiency of durability design.