bluuebunny/crossref_metadata_2025_split huggingface dataset:
Defect detection of injection-molded parts based on improved-YOLOv5
Authors: Liang Haoming , Chen Jianrui , Xie Wei , Yu Xiaoyuan , Wu Weilin 
Published: December 2022

Abstract
Quality inspection with injection-molded parts (IMPs) is an essential part of the process of producing IMPs. To improve production quality, we propose an improved-YOLOv5 model to detect the object defection of the IMPs. Different from the original YOLOv5, we replace the coupled detection head (CH) with the independent decoupled head (IDCH), while adding the Squeeze-and-Excitation attention mechanism (SE) into the regression branch. Furthermore, a defective dataset of IMPs is constructed within the real-world production line, including 1357 IMPs images. The experimental results demonstrate the effectiveness of the improve-YOLOv5. Compared with YOLOv5, the precision and recall of the modified algorithm in this paper are increased by 2.5 % and 4.7 %, respectively. For difficult categories, precision and recall are increased by 8.7 % and 13.5 %, respectively.
Study of interface monitoring technology for bored concrete infill piles
Authors: Tong Zhifeng , Zhang Dexiang , Zhou Xu , Chen Bin , Zhang Hong 
Published: December 2022

Abstract
Bored piles have been widely used in highway, railway, and other structural engineering foundations due to their mature construction technology, high bearing capacity, and wide range of applications. Inaccurate positioning of the concrete filling interface in bored pile holes will easily lead to overfilling and other engineering diseases, resulting in material waste and cost increases. The current method of rope-tied hammer measurement is time-consuming, labor-intensive, and cannot accurately determine the concrete surface. In order to dynamically monitor the concrete grouting interface, this paper develops a concrete grouting interface monitoring system based on the solid-liquid buoyancy principle, which determines the height of the grouting interface position by monitoring the buoyancy value and controls the motor forward and reverse working states to achieve the purpose of intelligent monitoring of concrete grouting interface. It solves the problem of overfilling or underfilling, realizes green construction and improves quality, and increases capital.
Analysis of stamping crack in bake hardening steel
Authors: Feng Huixiong , Huang Geng , Liu Xueli , Li Liejun 
Published: December 2022

Abstract
The bake hardening steel can better solve the contradiction between stamping formability and dent resistance of steel plates due to the lower strength and higher formability during stamping, as well as the advantages of increased strength after coating and baking. However, bake hardened steel can suffer from cracking problems in the stamping process. In this paper, the mechanical properties and stamping properties of the bake hardening steel were tested, and the production process was also analyzed. The results showed that the material has aged due to the long storage time, decreasing elongation. The main reason for stamping cracks was the reduction of the amount of oil applied to the material anti-rust oil. When the material was stored for a long time, the anti-rust oil on the surface of the steel plate volatilized, resulting in cracks in the stamping. Based on the above research, the material delivery time was strictly controlled. The cracks disappeared by supplementing and oiling the materials that had been stored for more than five months. The stamping performance of the bake hardening steel is improved.
Analysis and measures of rolling marks on hot galvanizing leveler
Authors: Zhang Kun , Yuan Jian , Feng Huixiong , He Chunyu 
Published: December 2022

Abstract
Hot-dip galvanized sheet is widely used in industries, such as automobiles, home appliances, electronic appliances and construction, due to its good corrosion resistance, processability, weldability, and paint ability. With the development of the automobile industry, the surface quality requirements of automobile steel are gradually improved. However, The galvanized sheet produced on our GJSS 2# galvanizing line often has rolling marks defects, which seriously affects the quality of products. This paper analyzed the physical and chemical features of the defect sample of roller marks on the sheet. Based on the research and analysis, measures such as adding side guide pulleys on the work roll chocks, high-pressure water spray was added to the lower backup rolls when changing rolls, and water barriers were added to the work roll tracks. The results showed that these measures reduced the occurrence of roll marks.
Design and analysis of Double-cavity micropump of flexible valve
Authors: Yan Ju , Dai Jietao , Li Liejun 
Published: December 2022

Abstract
Piezoelectric micropump and surface tension micropump are generally favored in industrial applications, but these two micropumps have obvious defects through industrial practice. Due to the presence of a piezoelectric oscillator, it is difficult to reduce the volume by optimization further, and the oscillator will be damaged to a certain extent after use for a long time. Based on electric wetting on dielectric (EWOD), a new, efficient EWOD-driven flexible valve micropump is designed using EWOD and flexible valves to replace the conical tube, and a dual microchannel structure is proposed to reduce flow fluctuations at the outlet. The working principle of the EWOD flexible valve micro-pump is deeply discussed. The micropump design is optimized by the finite element method, and its performance is analyzed. The numerical analysis results show that: (1) When the flexible valve structure is adopted, the micropump outlet flow increases significantly. (2) When using the double microchannel, the outlet flow fluctuation of the micropump is significantly reduced. (3) Using the structure of the double microchannel, the micropump has two internal rings, and the direction of the inner ring is related to the direction of the vibration droplet. The EWOD micropump structure is designed to solve the reflux phenomenon in the current micropump pumping process
Experimental study on forming process of the high-precision high-alkali glass tube
Authors: Li Zijin , Zhang Yang , Zhou You , Lv Xueliang , Hong Sheng , Li Kaiyu , Zheng Jingming 
Published: December 2022

Abstract
Rigid optical fiber products (optical fiber panels, image inverters, etc.) are a kind of image coupling and transmission device with excellent performance, which is formed by regular arrangement and fusion of tens of millions of optical fibers with a diameter of 3 to 6 μm. As the basic material for optical fiber, the high-alkali glass tube is one of the cores of optical fiber technology. The geometric parameters and precision of the high-alkali glass tube are completely determined by the molding process. This paper summarizes the influence of a single process parameter on the geometric parameters of the glass tube by studying the aspects of temperature, pressure in the tube, and traction speed, and systematically analyzes a large number of experimental data to establish an overall forming control theory, which provides a theoretical basis for actual production and proposes an improvement plan for high-precision high-alkali glass tube forming equipment to improve product quality.
On the correlation among ultra-fast quenching, retained ferrite content and strengthening mechanism in PC steel bars
Authors: Xiong Zhitao , Li Liejun , Peng Zhengwu , Gao Jixiang , Han Rongshuang 
Published: December 2022

Abstract
Prestressed Concrete (PC) steel bars made of 30MnSi are widely used in various prestressed components. This paper compared the hot-rolled, cold-drawn, quenched and tempered samples of PC steel bars, observed the microstructure evolution and hardness changes of steel bars in various processes, and studied the austenitizing process and mechanical properties at different quenching temperatures. The results show that there is a small amount of residual ribbon ferrite in the tempered microstructure, and the hardness of the quenched and tempered microstructure fluctuates locally, which may be related to the inhibition of ferrite recrystallization by rapid heating and the heterogeneity of carbon during austenitizing. With the increase of quenching temperature, the residual ferrite content decreases, and the tensile strength, hardness and yield ratio increase, while the plasticity decreases.
Effect of Testing Standard on Parameter Optimization of Fused Deposition Modelling Process
Authors: Gao Ge , Xu Fan , Xu Jiangmin 
Published: December 2022

Abstract
Fused deposition modeling (FDM) has emerged and spread worldwide as the most commonly used additive manufacturing (AM) technique. However, to this day, there has been no specific available guidance to evaluate the mechanical performance of FDM products quantitatively. The current approach to mechanical testing standards utilizes existing guidelines for testing materials, which may lead to a discrepancy in results. The topic of this article is to investigate three widely applied testing standards, namely ASTM, ISO, and GB, to analyze the impact of which on the tensile strength of FDM samples and in what amount. Polylactide (PLA) samples are prepared according to the three standards above. Four parameters (nozzle temperature, print speed, layer thickness, and raster width) with three levels are selected as control variables, and the Taguchi method is used for parametric optimization. Statistical analysis shows that the importance orders of parameters that affect the tensile performance as well as optimal levels for maximizing tension obtained based on different criteria are different. In addition, the results from ISO and GB samples are consistent, which are quite different from that of ASTM samples. The outcome of this study is helpful for the selection of testing standards in the FDM process and can make a reference for the experimental design for FDM users.
Influencing factors and conditions of increasing N in molten steel
Authors: Guo Dongdong , Li Huicheng , Chen Ting jun , Zhang JiaNin , Liu Sheng 
Published: December 2022

Abstract
N content has the important influence on the performance of rolled material and needs to be keep a watchful eye. However, the current N content control course is relatively simple and needs to be further studied. Starting from the full steel smelting course, through the analysis of the influence factors of increasing N in liquid steel and conditions, found that the main node control enhance of N in liquid steel and operating points, summed up the appropriate bottom blowing N gas pressure and flow rate, improve the control level of bottom blowing N and N content, the ability of N steel smelting in batches, ensure the quality of liquid steel meets the demand of high standard special steel, at the same time achieving production cost reduction.
Research on the low-pressure casting process of a double suction impeller in 304 austenitic stainless steel with high performance and thin-wall complex structure
Authors: Liu Yixiong , He Haiping , Gao Jixiang , Li Gang , Liang Yi , Li Liejun 
Published: December 2022

Abstract
The manufacturing of thin-wall complex castings using pressure-assisted casting is one of the most significant challenges for structural applications requiring excellent mechanical properties and fuel. In this paper, efforts have been made to manufacture thin-wall complex structure casting using high-temperature alloys with high strength. Low pressure casting forming process was used to manufacture a double suction impeller in 304 austenitic stainless steel with a thin-wall complex structure. By combining 3D printed sand mold with an optimized low-pressure casting process, a double suction impeller with a thin-wall thickness of 3mm was successfully prepared. The prepared double suction impeller showed structural integrity, smooth surface, and compact structure. The filling and solidification process of the 304 austenitic stainless-steel melts were analyzed using casting simulation software. The casting had an excellent mechanical property with a tensile strength of 595 MPa, yield strength of 265 MPa, and elongation of 48%. Results show that the improved low-pressure casting processes could be applied to the production of thin-wall complex structure parts during high-temperature casting processes. The results are of great significance to the casting of high-temperature alloys.
Corrosion resistance evaluation model for automobile
Authors: Wang Xin , Ren Kaixu , Xu Shujie , Wang Jiayu , Liu Peng 
Published: December 2022

Abstract
Based on corrosion big data and user demand, this paper provides a passenger car corrosion resistance evaluation model with strong practicability, operability, and good discrimination. Considering the three dimensions of time, the number of problems, and severity, the corrosion resistance of the whole vehicle is comprehensively evaluated through appearance, function (primary evaluation index), and coating scratch (bonus item), to reflect the advantages and disadvantages of automobile corrosion resistance with quantitative score value. It aims to provide a yardstick for evaluating the corrosion resistance of automobile products and technical support for reasonably improving the anti-corrosion quality of automotive products and help the industry effectively control the corrosion problems of passenger cars.
Numerical simulation study of corrosion behavior of Ni-P coating under multiple working conditions
Authors: Zuo Youxing , He Danna , Wang Shixin , Yu Ziyuan 
Published: December 2022

Abstract
The research on marine corrosion protection is very important in modern naval warfare. In this paper, combined with the working environment and usage requirements of underwater equipment, a 3D modeling is carried out based on a certain type of underwater equipment, and the model was divided into regions according to the difference between the base material, and the electrochemical corrosion protection was established through the finite element simulation software COMSOL Multiphysics. The simulation model was used to simulate and analyze the corrosion laws of various parts of the equipment under three different working conditions. According to the simulation results, the corrosion rate of the equipment under the protection of Ni-P chemical coating is much lower than the natural corrosion rate and the corrosion rate in seawater with a 30% concentration of Na2SO3 corrosion inhibitor, and the Ni-P chemical coating has a good anti-corrosion effect. This paper puts forward suggestions for the follow-up improvement and development of the corrosion protection research of this type of underwater equipment and provides a reference for the research on the corrosion behavior of other metals.
Smoke target detection based on dynamic multi-frame decimation with cavity convolution
Authors: Zheng Yuanpan , Niu Yiqing 
Published: December 2022

Abstract
Compared with traditional smoke alarms, smoke detection based on video images has the advantages of low cost, fast response time, wide applicability, etc. Smoke detection algorithms are becoming an effective and widely used tool for early warning of fires by recognizing smoke graphic features. In this paper, we use the VGG-16 neural network as the benchmark network and improve it by using null convolution and combining it with the dynamic multi-frame subtraction method for smoke detection. The experimental results show that the proposed method is useful for early warning of smoke in the early stage of a fire before it becomes intense.
Research on the three degrees of freedom hysteretic mechanical model of floating rafts
Authors: Zhang Zhenli , Qiang Lei , Wang Qiangyong , Ding Ding , Du Saipeng 
Published: December 2022

Abstract
A floating raft is a complicated multilayer vibration isolation system, which is often simplified as a two-degree-of-freedom viscous damping system in analysis. In order to research the influences of the hysteretic damping and the raft flexibility on the vibration isolation effect, a three-degree of freedom hysteretic mechanical model of the floating raft is established, and the impedance method is adopted to deduce the model of the force transmissibility of the floating raft. The analytic calculation methods of force transmissibility are given aiming at the low-frequency range, the resonance range, and the high-frequency range, respectively. Finally, the influence rules of damping, mass, and stiffness on force transmissibility are analyzed aiming at the value range of parameters of most floating rafts. The main analysis conclusions are listed as follows: the analytic calculation equation for resonance frequency and resonance peak is accurate; the vibration isolation effect of the high frequency range is determined by the entire floating raft, the unconstrained raft, the inherent frequency of the equipment, the mass ratio between the raft and the equipment only; the hysteretic damping can reduce the force transmissibility at the place of the resonance frequency of the floating raft, which shall be maximized; the increase in the mass of the raft will reduce the force transmissibility during the frequency range above the inherent frequency of the equipment, but it will reduce the marginal benefit; the reduction in the stiffness of the isolator or the raft will reduce the force transmissibility during the frequency range above the inherent frequency of the equipment, and will increase the displacement of the equipment; with limited displacement, it is better to design the isolator and the raft according to the principle of equal stiffness.
Centrifugal casting simulation and physical field analysis of ZL107
Authors: Liu Tianze , Ban Chunyan , Le Qichi , Zhao Dazhi , Kang Jianming 
Published: December 2022

Abstract
Centrifugal casting is one of the commonly used production methods for cylinder liner preparation. Al-Si-Mg centrifugal casting alloys have been extensively studied and applied, but as the matrix material, its mechanical properties still cannot meet the service requirements in a severe working environment with high strength, large load, or high temperature. Therefore, most Al-Si-Mg centrifugal casting alloys can only bear medium and low loads and operate in an environment below 150 °C. It has greatly restricted the development of industrial and civil fields. In this paper, ZL107 alloy was taken as the research object and Fluent 2021R1 simulation software was used to explore the filling characteristics of Al-Si-Cu alloy under centrifugal casting conditions. When the casting temperature was 770 °C, the initial casting temperature was 230 °C, the rotation speed was 1400 rpm and the casting speed was 0.45 m/s, the casting filling and solidification processes were analyzed based on the temperature field and velocity field. The test shows that there are large temperature differences between the outer surface and the inner surface of the casting, axial and radial, which are the parts where defects exist. The approximate area of the defect is estimated, which has a certain guiding role.
Research on size coupling and sensitivity analysis of SAR antenna truss rod
Authors: Li Yun , Zeng Ting , Chen Ling , Zhang Zhiqiang , Liu Jianze , Chen Lihui 
Published: December 2022

Abstract
To eliminate the influence of the size coupling of SAR antenna truss rod on assembly accuracy, this paper defines the assembly sequence, part datum, tolerance, assembly operation, and measurement operation of the model by establishing the tolerance analysis model of the assembly dimension chain and measurement target. The assembly simulation process of the deployment mechanism is simulated, the plane deviation of the antenna panel of the deployment mechanism is analyzed, and the contribution and sensitivity data of each component ring size to the closed ring size are obtained. The simulation results show that the in-plane angle error of the antenna panel is mainly affected by the length of the component ring rod. By focusing on controlling the dimensional tolerance of the truss rods with high sensitivity, the assembly accuracy of the antenna deployment system can be guaranteed. Sensitivity is the magnification of assembly deviation by the transmission of deviation source, which reflects the influence of the change of composition tolerance on the change of functional requirements. According to the sensitivity analysis, the key dimensions that affect assembly accuracy can be obtained. The assembly requirements of high-quality and low-cost products can be achieved by strictly controlling the dimensional tolerance of key components and relaxing the tolerance of non-key components.
Modeling and driving function optimization of tree climbing robot
Authors: Yang Xi , Pan Songbo , Wang Jichen , Liu Rui , Li Wenhui 
Published: December 2022

Abstract
To ensure the tree-climbing robot can complete the up-tree or down-tree process, its arms need to adjust the displacement of the push rod in real-time according to the diameter size of the tree trunk so that the tire can smoothly bypass the smaller tree pile. However, the irregular shape of the trunk surface makes the inflatable tire vibrate during rolling, which will reversely affect the performance of the push rod. Based on this, the three-dimensional model of the tree-climbing robot is established by Solid Works software, and the kinematics simulation model of the tree-climbing robot is established by Automatic Dynamic Analysis of Mechanical Systems (ADAMS). The kinematics simulation analysis is carried out. According to the tire displacement curve of the tree-climbing robot, the optimal solution of the push rod driving function is solved. Under the condition of ensuring the trajectory of the spiral rise is unchanged, the mean square deviation of the distance between the two arms of the tree-climbing robot is the smallest, and the push rod is the least affected by the reverse effect of the tire. The simulation results show that under the condition of the optimal solution, the frequency distribution and amplitude of the four springs are basically the same. The force of the four springs is uniform, and the reverse influence of the tires on the two push rods is minimized, which is conducive to the improvement of the stability of the tree climbing robot.
Mechanical properties of aluminium alloy 6082-T6 plate and butt weld joint: Experimental test, numerical modelling and application
Authors: Cui Xintao 
Published: December 2022

Abstract
Aluminium alloy has high mechanical properties and is widely used in manufacturing vehicles to reduce weight. This paper describes an experimental and numerical study of the mechanical properties of aluminium 6082-T6 plates and butt weld joints. Experiments were conducted on three 6082-T6 plates and three butt weld joint specimens, and then stress-strain curves were obtained and analyzed. Finite element (FE) models were developed and validated against the test results. Based on the test and numerical data, the application of the strength analysis of an electrical commercial truck frame with aluminium 6082-T6 using the finite element method was illustrated. The results show that compared with the base metal, the tensile strength of the butt weld joint is significantly reduced since the welding heat affected zone became a weak part of the joint. The results of the case study show that strength analysis of the truck frame with aluminium 6082-T6 using the FE method can be performed based on mechanical performances obtained in this study.