bluuebunny/crossref_metadata_2025_split huggingface dataset:
Non-destructive Testing Assisted by Six-Axis Manipulator Based on POE Formula
Authors: Hou Xiaoling , Gao Xingyu , Bin Liao , Peng Yanhua , Mao Yikai 
Published: March 2021

Abstract
At present, aluminum plates are widely used in aerospace, machinery, and other fields because of their light weight, good manufacturability, and strong corrosion resistance. However, during long-term use, defects that will affect the structural strength such as cracks are easy to appear. Therefore, it is necessary to conduct automatic non-destructive testing of large metal plates to determine the location, size, and structural damage to their defects. Compared with manual detection, automated detection has many advantages such as high detection efficiency, high repeatability, strong flexibility, and low labor intensity. Based on the spinor theory, this paper uses the product of exponentials (POE) to model the kinematics of the Aubo-i5 manipulator and obtain the positive kinematics equations, which are compiled by analytic geometry and algebraic methods combined with Paden-Kahan subproblems and matrix theory. The inverse kinematics algorithm of the 6R manipulator is based on this model. An automated non-destructive testing system including a robotic arm and ultrasonic phased array testing equipment was built. At the same time, a robotic arm simulation platform was built based on ROS, and the inverse kinematics algorithm was used to control the robotic arm through the MoveIt!. The angle error can be controlled within 2.5°.
Analysis of the Axial Fan Performance Mounted on a 4.5kW Aviation Motor
Authors: Liu Bin , Yu Zhongjun , Fu Jia , Chen Zutao 
Published: March 2021

Abstract
Integrating an axial flow fan with the rotor is a sufficient cooling method for high-speed and high power density motors. Different from the axial fan design work under ideal intake condition, i.e. the intake flow of the fan is axial and uniform, the flow in actual engineering is more complex, which means the flow characteristics of an integrated fan are changed and disturbed. It leads to a performance penalty of the fan, and in some conditions it makes the fan stall, so it is important to get a knowledge of the flow characteristics and the performance of the integrated fan. A certain 4.5kW aviation motor with integrated axial fan is taken as the research object. Firstly, the motor-fan coupling simulation model and ideal axial intake simulation model are established, in which the mass flow rates are same, then calculation is conducted. Secondly, the simulation results are analyzed and compared, focusing on the performance of the axial fan, especially the static pressure rise, and the conclusion is obtained that the static pressure rise in ideal axial intake situation is higher than that in coupling situation. Furthermore, the reasons for the characteristics change are explored, finding that the increase of flow turbulence due to the more complex wind road structure is the main cause for these changes. This paper investigates the flow characteristics and axial fan performance mounted a whole motor, making a contribution to better understand the changes in fan performance under motor-fan coupling situation.
Effect of Cr on microstructures and properties of AlTiVZr0.2Crx light weight high entropy alloys
Authors: Wang Yongqi , Li Anmin , Wei Shanjun , Wu Yu , Wang Chang 
Published: March 2021

Abstract
AlTiVZr0.2Crx (x=0,0.4,1) high entropy alloys have been prepared by powder metallurgy technology, and the effects of Cr content on the microstructures and properties of the alloys have been studied. The results show that the AlTiVZr0.2Crx alloys are mainly composed of body-centered cubic solid solution (BCC), face-centered cubic solid solution (FCC), and Al2Zr, AlTi2 and Cr2Ti intermetallic compounds. The addition of Cr promotes the transformation of the alloys from FCC structure to BCC structure and generate new phase Cr2Ti. The microstructure of the alloys are mainly massive or granulate. The hardness, compressive strength and elastic modulus of AlTiVZr0.2Crx alloys increase with the increase of atomic ratio of Cr content, the maximum hardness of AlTiVZr0.2Cr alloy is 685.3 HV, and the maximum compressive strength and elastic modulus are 1180.36 MPa and 30221.36 MPa respectively. The addition of Cr content also affects the friction coefficient and wear resistance of the alloys. With the addition of Cr, the friction coefficient and wear resistance increase first and then decrease. The wear resistance of the AlTiVZr0.2Cr0.4 alloy is the best in this experiment.
Investigation on Terminal Correction in Theoretical Model of the Microperforated Panel Absorber
Authors: Yang Xiaocui , Zhu Nannan , Zhao Rongxing 
Published: March 2021

Abstract
Microperforated panel (MPP) absorber is promising sound absorbing structure for the noise reduction. It is extremely especially to construct accurate theoretical sound absorbing model of the MPP structure for design and development of an excellent sound absorber. Thus, modification and validation of the terminal correction in theoretical sound absorption model of the MPP absorber is investigated in this research, which aimed to improve its accuracy and reasonability. Firstly, based on the Maa’s theory, classic sound absorption model of the MPP absorber was presented and treated as basic reference of the whole research. Secondly, through a set of verification experiments, necessity and importance of the research on reasonability of terminal correction was revealed. For the superposition of several monolayer MPP absorbers, when its sound absorption coefficient was derived as the multilayer MPP absorber through the transfer matrix method, the terminal corrections for the former n-1 monolayer MPPs should be removed, because length of these MPPs was 0. Thus, it was essential to take length of the rear cavity into account for the terminal corrections in the theoretical sound absorption model of the MPP absorber.
Study on Influencing Factors and Laws of Temperature Field Distribution of Infrared Hot Air Reflow Soldering
Authors: Ji Chenyang , Pang Zhanming , Zheng Yi , Zhou Hongda , Chen Cai , Yin Yu Tian , Gong Yubing 
Published: March 2021

Abstract
The quality of solder joints formed by reflow soldering is closely related to the temperature profile of solder joint during the hot air reflow soldering process. The temperature profile of solder joint is directly determined by the process parameters of the reflow furnace as the layout of the PCB design remains same. In this paper, the temperature model of the printed board assembly during reflow soldering is numerically built and simulated to obtain the temperature distribution. Furtherly, several process parameters, such as the temperature of each temperature zone, convective heat transfer coefficient and conveyor belt speed of reflow soldering furnace, are selected as the input variables, and the heating factor, time of super liquidus and peak temperature are aimed as the output parameters. The Latin hypercube sampling design is applied to construct the response surface of the output parameters. The influence of these process parameters during the reflow soldering on the temperature profile of PCBA is studied comprehensively. The main influencing process parameters of the reflow soldering are identified and their influence laws are obtained. The research results provide valuable reference and basis for reflow soldering process design.
Study on the Influence of Surface Texture on the Dynamic Performance of Sliding Bearing
Authors: Chen Changsheng , Li Shan , Ma Zhenlai , Li Guoping , Wang Qiang 
Published: March 2021

Abstract
Rotor bearing system is an important part of mechanical equipment. The vibration of equipment caused by rotor system has become a more important problem in engineering. In this paper, the texture technology of the inner surface of the bearing is studied to explore the influence of the surface texture on the vibration reduction characteristics of the bearing. The results show that reasonable texture parameters and texture distribution can reduce the friction of the bearing and increase the end discharge. There is an optimal texture density and texture region. In this paper, a bearing test platform is set up to test and study the tiles with different surface texture. The test results show that the amplitude of the axis orbit of the sliding bearing with texture is significantly reduced, the principal stiffness and cross stiffness of the textured bearing are larger than those without texture, the damping is slightly larger under high speed and light load than that without texture, and the texture has obvious damping effect on the bearing shell.
Fault diagnosis of rotating mechanical bearing based on adaptive noise-complete ensemble empirical modal decomposition and time-reallocated multisynchronous compression transform
Authors: Dai Hanfang , Wang Yanxue 
Published: March 2021

Abstract
Due to the noise interference in the original vibration signals measured from vibration sensors, it is necessary to noise reduce the signals before extracting fault features from them. This paper proposes a fault feature extraction method combining the adaptive noise-complete ensemble empirical modal decomposition (CEEMDAN) and the time-reallocated multisynchronous compression transform (TMSST), which first decomposes the original signal, then combines the relevant index values of the decomposed signal to filter the optimal signal components, and finally uses the TMSST to extract the fault features from the reconstructed signal. In this paper, a set of simulated signal data and two sets of experimental data are used to evaluate the performance of the method, and the results show that the method works well for rolling bearing fault signal identification.
Research on comprehensive evaluation of data link based on G1 method and entropy weight method
Authors: Jin Ming , Zhang Junyan , Cui Shuo , Kang Mei , Xiao Yi , Xiang Rongxin , Yan Zhenye 
Published: March 2021

Abstract
With the rapid development of mobile Internet technology and the advent of the 21st century Internet and information age, data has become the most important strategic core resources. With the rapid development of ubiquitous power Internet of things construction, there are still many problems in the data link monitoring and data management: the low effectiveness of data transmission affects the normal operation of the data link; there are few data evaluation models, which lead to the problem of one sidedness and subjectivity in the understanding of the operation status of the data link. Aiming at the problem that the current data link cannot directly show the link quality, this position proposes a comprehensive evaluation method for the entire data link based on the order relationship analysis(G1) method and the entropy weight method. First, establish a complete data link indicator system, and then separately Use the order relationship analysis method to determine the subjective weight, use the entropy weight method to determine the objective weight, and finally combine the two to determine the comprehensive weight, and obtain a comprehensive score that reflects both the expert level and experience and the actual situation related data. The data and transmission conditions of each link are shown, and the comprehensiveness, rationality and scientificity of the method are also demonstrated.
Prediction of simulation parameters of fiber laser cleaning Range hood based on BP neural network
Authors: Yu Jinghua , Chen Yifeng 
Published: March 2021

Abstract
In order to study the influence of process parameters on the surface oil pollution of fiber laser cleaning Range hood, the test of laser cleaning to remove the surface oil pollution of Range hood was carried out. Based on the BP neural network, a prediction model of the process parameters such as laser scanning speed, cleaning times and cleaning line spacing is established. the training samples collected by the cleaning test were trained online, and the training model was verified by using the test samples. The results show that the neural network prediction model has high accuracy and good training effect, and the maximum relative error between the predicted value and the test sample value is 8.4%. The model can predict laser cleaning effectively oil stain quality on Range hood surface.
Research on condition monitoring device of HDTSE for intelligent maintenance
Authors: Lin Chuanglu , Wei Zhang , Mo Shaomeng 
Published: March 2021

Abstract
The role of HDTSE is becoming increasingly important. According to the operation characteristics of, This paper analyze the causes of escalator failure, adopts Internet of things, intelligent sensing and distributed technology, presents an escalator operation monitoring system architecture for intelligent maintenance, design the hardware and software of the monitoring device, realize the real-time monitoring of key parameters of escalator and fault warning. It has high application value.
The finite element analysis of concrete pipe pile vacuum sucker
Authors: Wang Wei , Xu Ji Yong , Wang Yan , Qin Yuan Lei 
Published: March 2021

Abstract
The adhesion degree between the vacuum sucker and the surface of the adsorbed object seriously affects its adsorption performance. In order to solve the problem that the curved surface of cylindrical concrete pipe pile is not easy to be adsorbed, an elliptical vacuum sucker is designed. In order to study the influence of different unadsorbed areas on the adsorption force, the flow field inside the vacuum sucker is simulated and analysed by using computational fluid dynamics software (fluent). The corresponding curve between the unadsorbed area of the sucker and its adsorption force is obtained. According to the relationship, through the analysis of the size of the unconnected area of the vacuum sucker, it can be known whether the adsorption capacity of vacuum sucker meet the working requirements of the vacuum sucker adsorption cylindrical concrete pipe pile.
Modeling and optimization of B-axis hydraulic delay for gantry-type CNC machine tool
Authors: Fei Ya , Chen Xuezhen , Li Ying , Liao Gang , Zhang Weiwei , Zhang Yun 
Published: March 2021

Abstract
Due to the limitation of dimension, structure and material, aviation structural workpiece is usually processed by AB rotary axis five-axis CNC gantry-type machine tools with large torque. However, the B-axis mechanical structure of gantry-type machine tools is complex and bulky, and hydraulic system is adopted for gravity balance. After the long production period of the machine tool, the hydraulic balance force of the B-axis is lost immediately and the spindle goes out of control when it emergency stops, which seriously endangers the quality of workpiece. In view of this phenomenon, this paper takes the hydraulic control system of machine tool as the breakthrough point, and analyzes the hydraulic system without adjusting the mechanical structure. And the mathematical model of hydraulic system is established. The hydraulic control system of B-axis is optimized by the simulation of MATLAB/Simulink. On the premise of improving the stability of the system, the duration of hydraulic balance force is extended, and the deflection time of 2 seconds is delayed, which effectively reduces the processing risk of workpiece.
Quality Inspection of Gluing in Narrow Border Based on Depth Map
Authors: Zou Xiang , Gao Xing-Yu , Liao Bin , Wei Chuan-Nen 
Published: March 2021

AbstractTo solve the problem of glue breakage and overflow in the packaging process of mobile phones, a glue detection algorithm based on the depth map is proposed. By collecting the image no gluing and gluing after dispensing, the pixel value of each frame in the corresponding position of the corresponding sample is sequentially intercepted in the same sample, and the glue contour is reconstructed by rearranging the intercepted ROI. Last, measure the width and height information of the glue according to the contour, and judge the defect problem at the same time. Experimental results show that the algorithm can accurately measure the result of the micron-level glue, and accurately determine the lack of glue. At the same time, the measurement accuracy of the algorithm is 0.01mm, and the measurement results are accurate and stable.
The Measurement and Control Research of Non-metal Material Volatile Organic Compound in Civil Aircraft
Authors: Ru Wang 
Published: March 2021

Abstract
The paper expounds the source of volatile compounds in the air of civil cabin. By measuring the air quality in civil cabin and Volatile organic compound (VOC) content of typical non-metal material, in addition, comparing domestic control laws and standards of VOC in civil airplane cabin air with which in overseas, the paper attend to offer recommendations to control civil airport non-metal material VOC and provide a reference for control of non-metal material in civil airplane cabin to related enterprises. The research is aimed to create a foundation to produce a new representation of green and safe domestical civil airplanes. It is very meaningful to motivate domestical civil airplane industry and the international progress of enormous industrial chain that influences.
The microstructure and properties of Cr/Ni alloying layer after surface alloying treatment induced by continuous scanning electron beam process
Authors: Ren Xulong , Wang Rong , Wei Deqiang 
Published: March 2021

Abstract
The surface alloying of scanning electron beam can improve the microstructure and mechanical properties of steel materials. In this paper, Cr/Ni alloying treatment was performed on 35CrMo alloy structure steel by using continuous scanning electron beam to improve surface performance. The influence of scanning electron beam technology on the structure of alloy layer is studied, and the influence of coating thickness on the structure and properties of the alloying layer is discussed. The results show that the surface of 35CrMo steel is composed of alloying layer, heat affected zone and matrix. The microstructure of the alloying layer is short columnar crystal, equiaxed crystal and acicular martensite. The surface hardness can reach 770HVwhen the coating thickness is 5μm, which is 2 times of the matrix. With the increase of Cr/Ni coating thickness, the surface of sample hardness decreases, and the corrosion resistance of the sample increases.
Study on the reverse martensitic transformation of Fe-Mn-Si alloy based on constraint state
Authors: Liu Linlin , Zhao Yijian , Zhao Tianxiang 
Published: March 2021

Abstract
The constrained stress-induced ε reverse martensitic transformation characteristic of Fe-Mn-Si alloy was studied by X-Ray Diffraction (XRD) and metallographic analysis. The results show that the origination temperature (As) of the constrained reverse transformation of Fe-Mn-Si alloy in cement matrix, compared with the unconstrained alloy, was immovability, the pause temperature (Af) was elevated, and the ε reverse martensitic transformation became slower under the same recovery temperature. At the same time, the amount of the constrained stress-induced ε reverse martensitic transformation decreased and the reverse transformation temperature zone broadened with the increasing degree of prestrain.
Research on adaptive thermal control system of space optical remote sensor
Authors: Yu Feng , Meng Qing Liang , Xu Na Na , Yu Zhi Qiang , Zhang Ping 
Published: March 2021

Abstract
The traditional thermal control system of the space optical remote sensor is mainly based on passive thermal control and supplemented by active thermal control of electric heater. But with the development of the remote sensor in the direction of multi-task and multi-function, the thermal control system needs to meet the requirements of low thermal control resource consumption under the condition of multi heat source and large heat load, and high adaptability under the condition of multi attitude complex orbit. The traditional thermal control system can not satisfy these new requirements. In this paper, a new adaptive thermal control system is studied. A geostationary orbit camera as an example is taken to compare the design scheme of the traditional thermal control system and the new thermal control system. The simulation results show that the new thermal control has the advantages of more optimized system resources and stronger temperature adaptability under complex tasks, which provides a new idea for the subsequent thermal control design of complex large space optical remote sensor.
Research on the Use of Computer Music in Modern Musical Composition
Authors: Fu Quanwei 
Published: March 2021

Abstract
In the ever-changing society, disruptive technology not only causes a tremendous impact on the instruments that musicians play, but also how they make music and how we perceive them. Music algorithms and software as well as computational models are evolving as critical tools to give life to original musical ideas, diversify the nature of music, and create magnificent works of art. Even artificial intelligence can be applied to this vibrant field because they both deal with intellectual and emotional human activities. This paper investigates the current developments of computer music, its influence on the elements of modern music composition, and best practices of their applications in the music industry. The main purpose of this paper is to provide an overview of the use of computer music on music creation, analyze the latest trends of technical developments in music, to recognize the enormous potential of computer music along with its practical applications.
Research on Information Processing in Management Information System of Soguifret S.a.r.l Company in Guinea Based Levenshtein Algorithm
Authors: Camara Aissata Damaro , Dan Gao Xin 
Published: March 2021

Abstract
SOGUIFRET SARL’s service is a full import and export support service for products all over the world. It offers the customer the customs clearance of containers, packaging of effects, shipment of products and objects. The customer files of Soguifret SARL have been exhausted over time due to the large number of customers requesting it at any time, which has led to poor management, as it is a system paper to record customer and staff information. This situation has led to many problems: in particular, unnecessary duplication of data on internal and external customers; loss of information can also occur because data is stored manually and is difficult to locate; therefore, it is difficult to trace the flow of customer information after years of service. The method we have chosen in this article is the Levenshtein distance. He learns the “proofs” by calculating the minimum distance to transform one chain into another and vice versa. In particular, it facilitates data management by avoiding duplication of words in essential documents, gives staff efficiency by saving time and multitasking at the same time. Based on the research results, we have implemented a system using Java; which will facilitate your management of company data.