bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Computational Approach of Displacement Prediction in an Engineering Project
Authors: Tang Jonathan Chen , Peng Liang , Chen Zhenlei 
Published: March 2022

Abstract
In this paper, a fuzzy information granulation method combined with a support vector machine time series prediction model(FIG-SVM) is established for a subway cross passage project of Ningbo Metro Line 3. The FIG-SVM prediction model was used to predict the ground settlement of the subway access during the shield construction process. It was found that the FIG-SVM prediction model can effectively predict the ground settlement trend for the next construction stage based on the historical data of the ground settlement.
Design and Performance Analysis of Toothless Slip Type Magnetic Rotary Oil Well Pipe Tong
Authors: Zheng Jie , Bi Cheng , Lu Heng , Li Zhenzhen , Yang Xu , Yang Yushan , Lu Yuan , Dou Yihua , Zhang Yarong 
Published: March 2022

Abstract
Although the current hydraulic power pipe tong can improve efficiency and reduce strength, there are still some deficiencies. Among them, the inevitable defects are a low degree of automation, high labor intensity, complex mechanical mechanisms, and high maintenance costs. In order to improve its performance, the principle of permanent magnet motor is applied to the processing of shackle of oil pipe tong, and a new type of magnetic rotary oil pipe tong is proposed. The design eliminates the complex planetary gear train transmission mechanism and hydraulic circuit in the traditional tightening device, simplifies the mechanism of the tightening device, reduces the size of the device, saves the manufacturing cost, improves the automation degree of the power tong and reduces the labor intensity of the workers. The triangular chuck is suitable for clamping pipe strings with different diameters. In addition, due to the use of toothless slips, the damage of the tightening device to the sleeve is reduced, the sleeve is protected and the service life of the sleeve is prolonged. Therefore, this new type of magnetic rotary tubing tong has a good application prospect in the up and down operation.
Metal Defect Detection Based on Yolov5
Authors: Wang Kun , Teng Zixuan , Zou Tengyue 
Published: March 2022

Abstract
Metal surface defect detection has been a challenge in the industrial field. The current metal surface defect algorithms target only at a few types of defects and fail to perform well on defects with different scales. In this paper, a large number of metal surface defects are studied based on GC10-DET data set. An improved yolov5 detection network is designed targeting defects of various scales, especially of small-scaled objects, using a specific data enhancement method to regularize and an effective loss function to address data imbalance caused by small-scaled object defects. Finally, the comparative experiment on GC10-DET data set proves the major improvements on accuracy superiority of the proposed method.
Waveform Correlation Analysis Method for Mechanical Characteristics of Circuit Breaker in Intelligent GIS Equipment
Authors: Sang Zhongqing , Gu Xiaodong , Wang Yongxin , Jiang Weiyun , Cheng Wenjuan 
Published: March 2022

Abstract
Gas-insulated electrical appliances (GIS) have the characteristics of small footprint and low cost. Therefore, GIS is widely used in intelligent substations. However, once the GIS fails, there will be shortcomings of long maintenance cycle, which seriously affects the normal life and production activities. Based on this, on the basis of summarizing and analyzing the GIS intelligent technology, this paper studies the correlation analysis method of the mechanical characteristic waveform of the intelligent GIS equipment circuit breaker from the aspects of equipment intelligence, device development and software development,corresponding theoretical guidance is provided for the practical application of intelligent GIS equipment circuit breakers.
Torque Transmission Law of Wind Turbine Drive System under the Excitation of Uneven Wind Load
Authors: Qian Baiyun , Zhou Kuncheng , Gao Xiaoxia , Liu Wei 
Published: March 2022

Abstract
A random wind speed time history model based on Weibull distribution is constructed. According to the known mean and variance of wind speed, the time fitting curve of random wind speed is obtained through MATLAB simulation method. According to the wind speed range of the actual operation of the wind turbine, the obtained wind speed curve is transformed, and then according to the obtained relationship between the wind speed of the wind turbine and the input torque, the input time-varying torque of the actual operation of the wind turbine is obtained. Establish the rigid shaft model of the wind turbine gearbox, calculate the gearbox transmission ratios at all levels, and then obtain the torque output curves of the gearbox planetary stage, medium-speed stage, and high-speed stage under random wind speed input to study wind power the torque transmission law of the machine drive system. The ability to better analyse the transmission structure of the gearbox and the torque transmission law of key components has a certain significance for the design and manufacture of the wind turbine transmission chain.
Modeling Simulation and Experiment of Wide-range Current Transformer Based on New Nanocrystalline Alloy Material
Authors: Lu Bing , Chen Xiwen , Xu Zhongda , Nie Gaoning , Tang Xiaojun 
Published: March 2022

Abstract
In the traditional electromagnetic current transformer, when the operating current is too large or too small, the measurement error will fluctuate greatly, resulting in a sharp deterioration of the measurement accuracy. In order to solve this problem, the article first established a simulation model, measured the characteristic curve of the new nanocrystalline alloy material, and imported it into the simulation model. Compare the wide-range error conditions of the current transformer; then, use the new nanocrystalline alloy material as the new wide-range current transformer core, adjust the size of the wide-range current transformer core, and increase the diameter of the secondary winding for simulation; Finally, according to the simulation results, a prototype of a new wide-range current transformer is prepared and error tests are carried out. The test results of the experiment show that the primary side of the new wide-range current transformer is within the range of 0.1%-200% of the rated current. The limit of the ratio difference and the angle difference reaches ±0.2% and ±10’, which meets the measurement requirements of class 0.2 current transformers.
A Fuzzy Evaluation Method for the Drivability of New Energy Vehicles Based on Similarity
Authors: Huang Xincheng 
Published: March 2022

Abstract
The purpose of this paper is to propose a fuzzy evaluation method for the drivability of new energy vehicles. This method divides the evaluation processes of the vehicle drivability into two stages. In the first stage, the vehicle drivability test experts describe the importance of each drivability index through linguistic variables, and then the concept of similarity between two triangular fuzzy numbers is used to determine the weights of experts after converting linguistic variables into triangular fuzzy numbers. The weights of indexes are determined according to the combination of subjective and objective weights, in which the objective weights are determined according to the conflict degree between two fuzzy numbers for the rating of importance given by different experts under the same index. In the second stage, for each index, the experienced drivers give the rating of the vehicle drivability, and then calculate the weighted fuzzy value of the drivability indexes according to the indexes weights. The evaluation results are explained by numerical drivability and linguistic drivability. The former is obtained from the total fuzzy drivability through defuzzification, while the latter is determined according to the similarity between the total fuzzy drivability and the fuzzy number for the rating of the drivability. We give a numerical example to evaluate the drivability of three new energy vehicles.
Research on Probability Analysis Technology of Circular Section Cabin Socket Structure Based on APDL
Authors: Yi Long , Li Yuliang , Wu Henggui , Zhao Yukun , Zhong Maoping 
Published: March 2022

Abstract
In the strength design of sleeve joint structure, manufacturing tolerance and fit clearance are generally ignored. The load of connecting screw is usually calculated by the method of linear distribution. The contact force between screw and cabin is usually simulated by deterministic finite element method. The command flow of probability analysis for typical circular section socket structure is developed based on APDL. The uncertainty of manufacturing tolerance and fit clearance for socket structure is defined as random input variables, such as the cabin diameter, cabin hole position, and cabin aperture and so on. Monte Carlo method is used in probability analysis, and the input variables are random uniform distribution. The analysis results show that the transfer load of screws is redistributed under the probability analysis compared with the finite element analysis, and some screws bear larger load, while the nearby screws bear smaller load. At the same time, the load transferred by screw is not only affected by its own variables, but also by others. The probability analysis method can fully consider the influence of manufacturing tolerance of the structure, and evaluate the structural strength margin more accurately. It can not only prevent the harm caused by uncertainty of random manufacturing tolerance, but also prevent over design caused by conservative method.
Structural Design of Die-Casting Die for Industrial Cabinet Lock Handle Based on Pro/E
Authors: Tan Fenfang , Tan Zhihang , Luo Kuang 
Published: March 2022

Abstract
This paper uses Pro/E and CAD software to carry out the design of die-casting mold structure for industrial cabinet lock handle.Firstly, the three-dimensional modeling, process analysis and calculation of the handle parts are carried out, and then the solid model is established.The die-casting machine is selected according to the clamping force. Finally, the opening and closing die is simulated, and the general assembly drawing of the die-casting die is drawn to ensure the cooperation with other parts without interference, which is of certain guidance to the actual production.
Research on Valveless Piezoelectric Micropump Based on COMSOL and 3D Printing Technology
Authors: Wang Xinxin , Zhao Shanshan , Yan Xiaoxiao , Wang Zhen , Tang Gang , Zhang Liling , Xu Bin , Deng Xiaozhen , Li Yuwen 
Published: March 2022

Abstract
In order to make the output flow of the valveless micropump larger and obtain continuous pumping capacity, a valveless piezoelectric micropump with a combination of V-shaped structure inlet and Y-shaped structure outlet is designed, which saves the design and installation of microvalve and makes the structure relatively simple and easy to process. In this paper, first, the operating principle of the valveless piezoelectric micro pump is analyzed; secondly, COMSOL simulation software was used to perform modal analysis on the drive and the appropriate vibration mode was obtained. The displacement trend of the piezoelectric vibrator was simulated and tested at the frequency of 40 Hz and different voltages; finally, 3D printing technology was used to produce an experimental prototype of the micro-pump, and t the specific size of the micro pump is 20 mm×20 mm×6 mm. The test results show that, driven by AC voltage, the discharge liquid of the valveless piezoelectric micropump can reach 658.8μl/min.
Research on the Development of Unmanned Underwater System Detection Technology
Authors: Wu Yuqi , Deng Yuhan , Zhang Longgang , Zhang Qidong , Bao Ran 
Published: March 2022

Abstract
In recent years, the number of unmanned systems in the world has been increasing. The emerging underwater platforms such as UUV are large in number, small in size, low in speed and low in noise. In the future, a variety of ocean combat missions will use a large number of UUV platforms. The existing methods for detecting underwater vehicles mainly include sonar, magnetometer. Based on this, by referring to a large number of literatures, a review of the research progress of underwater exploration at home and abroad in recent years. And compared with the United States, Russia and other countries unmanned system detection technology and equipment, analysis of their applicable conditions and advantages and disadvantages. This paper summarizes the technical difficulties of underwater detection methods and proposes corresponding solutions. At the same time, we forecast the development trend of underwater detection technology in the future.
Research and Development of a Real-time UAV Flight Visualization Simulation System
Authors: Xiao Yang , Dai Shulin , Xiao Chenfan , Xu Xinfeng 
Published: March 2022

Abstract
On the premise of practical application, this paper describes the principle, technology and implementation methods of a real-time UAV flight visualization simulation system. The overall framework, hardware system composition, UAV flight model establishment, determination of flight control mode and control rate, design of 3D visual simulation system, management and processing of UAV flight state data are discussed, and finally, the actual application effect of the system is evaluated.
Kinematic Modeling of 3P2R Welding Robot Based on D-H Parameters
Authors: Chen Hongtang , Ma Haijun , Jiang Hongli , Lv Shenjin , Li Yong , Liu Heshan 
Published: March 2022

Abstract
To meet the demand of different vehicle models welding task, as well as lower the cost of specialized welding facility, a kind of 3P2R arc welding robot has been developed and SolidWorks is used to set up the Three Dimensional (3D) solid model. The developed robot includes 3P2R body, controller, and a welding power supply. The direct kinematical model and inverse solution have been worked out basing on Denavit-Hartenberg (D-H) method, and the direct kinematical model and inverse solution are verified by experiment. This robot could also be used to burring or spray field with the actuator changed.
Finite element analysis and structural design of fracturing pump valve chamber under multiple working conditions
Authors: Wang Xulong 
Published: March 2022

Abstract
Aiming at the engineering problem of fatigue crack cracking and failure of fracturing pump valve box under multiple working conditions in actual service, taking a model of three-cylinder fracturing pump valve box as the research object, analyze its working conditions and classify typical working conditions. combined with the working principle and the work sequence of each cylinder of the crankshaft, explore the working mechanism of each cylinder under different typical working conditions, According to the actual pressure pump valve box material and finite element geometric model, the service load equivalence under different typical working conditions is determined. Based on the ANSYS Workbench simulation platform, the finite element numerical analysis of the fracturing pump valve box is carried out to explore the internal stress-strain deformation distribution mechanism of the valve box under the actual service environment, and then the structural design of the existing fracturing pump valve box is improved, The calculation shows that the improvement effect is increased by 29%, which can provide theoretical reference and technical support for structural design optimization and fatigue analysis of fracturing pump valve box.
Improved Genetic Algorithm-Based Impulse Optimization for Cable-driven Camera Robot
Authors: Zhao Siqi , Su Yu , Zhu Qing 
Published: March 2022

Abstract
Cable-driven camera robot has the characteristics of high load/mass ratio, large working space, fast response speed and strong environmental adaptability, which has a wide application prospect and important development value. However, the high-speed movement of the camera robot has a great impact on its performance, and an optimal design method that meets its actual characteristics is needed to improve its overall performance. In view of the shortcomings of the standard genetic algorithm, such as premature convergence and insufficient global optimization searching ability, an improved genetic algorithm is proposed. Compared with the optimization results of the standard genetic algorithm, The improved genetic algorithm converges to the global optimal solution and the impulse decreases obviously, it shows that the improved genetic algorithm is more effective and practical, and reduces the impact of cable tension, thus obtaining better camera robot design parameters.
Numerical simulation on flow boiling characteristics in sinusoidal channels of airborne micro heat exchanger
Authors: Liang Xingzhuang , Xu Yu , Wang Jian 
Published: March 2022

AbstractWith the miniaturization of airborne system, heat dissipation has become a critical issue. Since sinusoidal channel can enhance flow disturbance, it has a stronger heat exchange capacity than that of straight channel. However, flow boiling characteristics in sinusoidal channel are more complex. Here, numerical simulations of flow boiling in sinusoidal and straight microchannels are conducted based on the VOF model with the inner diameter of 1 mm, mass flux of 500 kg/m2s and heat flux of 50 kW/m2. The effects of channel structure and hypergravity are obtained. The simulation results indicate that bubble evolution in sinusoidal channel is more complex than that in straight channel, and bubbles are more likely to coalesce, deform and break. Vortices appear in sinusoidal channel and disrupt the near-wall boundary layer. Bubble evolution combined with vortices affect the flow boiling performances. For straight channel, dryout is less likely to occur, while for sinusoidal channel, it is more likely due to more drastic flow changes. Furthermore, the transition of flow patterns is faster under hypergravity. For sinusoidal channel, flow patterns transform earlier into slug and circular flows.
Optimization and Solution of the Temperature Curve of Reflow
Authors: Zu Zishuai , Liu Hanbing 
Published: March 2022

Abstract
In the production process of electronic products such as process integrated circuit boards, some firmware needs to be heated and soldered to the circuit board through a reflow furnace. In this process, the temperature setting of each temperature zone and the control of the furnace passing speed play a vital role in the quality of the product. By consulting the data, it is known that the reflow heats the welding area by impinging jets, and it is considered that the heat transfer in the reflow is carried out by heat convection. Using Newton’s law of cooling, the three-dimensional heat transfer process is simplified to a two-dimensional unsteady heat transfer problem. Taking into account the lag of the center temperature of the circuit board relative to the surface temperature, it is considered that the heat transfer in the circuit board is carried out by heat conduction, and the physical parameters such as the density and heat transfer coefficient of the circuit board and the soldering area are integrated into a constant τ. The known data is obtained, and the temperature change law model is finally established.
Brake piston design for a new radial plunger motor
Authors: Chen Ruhuan , Shrive Chris , Wan Yanjiang , Chen Xiaoyuan , Shao Yun 
Published: March 2022

Abstract
A brake piston was developed for a new radial plunger motor. Typical brake on/off load cases were verified for these potential applications to avoid potential strength and durability risks. Furthermore, piston structural optimization was done to reduce casting costs. Finally, its thickness was reduced by 19%, and the cost was reduced by 10%. By FEA structural fatigue simulation and optimization method, The design time of piston design was shortened, cost down and product competitiveness was increased.
Study of atomization characteristics of air atomizing nozzles for additive manufacturing
Authors: Wang Zhisheng , Fan Wei , Shi He , Shi Pengyu , Don Rongxiao 
Published: March 2022

Abstract
In the present study, a series of experiments on the fuel jet from a 3D-printed swirling nozzle were performed. The particle size distribution of the fuel at different injection pressures was measured by a particle size analyzer, and the enhancement of the jet atomization by swirling air was also evaluated. The Rosin-Rammler distribution model was used to analyze the trend of the jet distribution modulus along with the fuel inject pressure, and the particle size variation analyzed the jet development process. The applicability of 3D printed nozzles for aero-engine was evaluated by varying the nozzle flow number.
Aerodynamic and Infrared Radiation Characteristics of the Spherical Convergent Flap Nozzle under Vector Actuations
Authors: Bai Jin , Yang Qingzhen , Li Yiwen , Gao Xiang 
Published: March 2022

AbstractIn present work, the aerodynamic characteristics and the infrared radiation (IR) features of the spherical convergent flap nozzle (SCFN) under vector actuating operations have been studied numerically. The infrared radiation (IR) features of the nozzle under different vector actuation angle have been studied using the reverse Monte-Carlo method (RMCM). Several parameters, such as IR intensity, radiation brightness, and the spectral radiant intensity of the nozzle, are analyzed in detail. The results show that SCFN radiation intensity distribution gradually transitions from two-peak distribution to single-peak distribution. When the pitching motion is activated, the “second peak” located downstream of the deflection vector angle is gradually weakened and disappears. The peak gradually approaches the peak of the mixer, and the contribution of the mixer gradually dominates. With the increase of geometric vector angle in the pitching direction, the detection angle of the nozzle’s infrared radiation intensity peak is less than the geometric vector angle, meanwhile the decrease of the peak value of the infrared radiation intensity of the nozzle is parabolic with the geometric vector angle. Along the direction of the pitching operation, the average value of the infrared radiation at a detection angle of −35° to 35° decreases linearly. When the yaw motion is activated, the infrared radiation intensity distribution in the backward direction of the nozzle exhibits a single-peak feature, and the detection angle at which the peak is located is also smaller than its geometric vector angle. Using the detection angle of the peak as the axis of symmetry, the curve of the infrared radiation intensity distribution behind the nozzle is symmetrical. As the geometric vector angle in the yaw direction increases, along the direction of the pitching operation, both the average value of infrared radiation at a detection angle of -35° to 35° and the peak value of the backward infrared integrated radiation intensity of the nozzle decrease linearly. Besides, the maximum drop is much smaller than the maximum drop during pitching operation.