bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation of the bright and dark line on the inner wall of a thin-walled copper tube by drawing with a floating plug
Authors: Liu Jinsong , Li Wang , Chen Dayong 
Published: March 2023

Abstract
In this paper, it was investigated that the defects of the bright and dark lines on the inner wall of a thin-walled copper tube by drawing with a floating plug based on analyzing the stress distribution. The experiments were conducted by employing a stereomicroscope, metallographic microscope and scanning electron microscope, respectively, meanwhile the three-dimensional finite element was applied to study the defect. It was demonstrated by the research results that the large gap between the sizing section of the plug and the outer die caused the inner wall bright and dark lines. The wall thickness was increased when the tube passed by the area without inner support which gave rise to local material uplift along the radial direction. The raised material became folds due to the effect of “leveling” when the tube pass by the conical section and the sizing sections. The fold was the essence of the bright and dark line by macroscopic scale observation. The bright and dark line was ultimately eliminated by adopting the drawing die with reasonable geometrical parameters according to experimental and simulated results.
Study on mechanical properties of PVC modified by new core-shell toughener
Authors: Chang Jun , Jin Meng-yue , Wang Bin , Hu Yu-hong , Zheng Wen-jie 
Published: March 2023

Abstract
To expand the application field of PVC and make PVC resin high-performance, much research has been done on the toughening modification of PVC at home and abroad. ACR tougheners with different core-shell ratios were prepared by core-shell emulsion polymerization, which was used to blend PVC resin. In the experiment, the tensile and impact properties of PVC/ACR blends were tested and the fracture morphology was observed. The impact properties of PVC blends with toughened particles with different core-shell ratios were investigated and compared with the commercial ACR-401 toughener. The best combination of toughening effect was obtained: when the PVC/ACR blend ratio was 100:3.5, the tensile strength of PVC toughened by ACR7030 core-shell particles was 22.78MPa, and the impact strength was 8.67 kJ/m, which was superior to the commercial ACR-401 toughener. Therefore, ACR7030 can significantly enhance the mechanical properties of PVC, and the toughened PVC shows ductile fracture.
Design of Loading and Unloading Mechanism of Spring Steel Cloth Fixture for Computer Embroidery Machine
Authors: Yin Haibin , Long Dekun 
Published: March 2023

Abstract
At present, the computer embroidery machine industry mainly uses manpower to disassemble the spring steel cloth clamp, which is very inefficient. This research designed a spring steel cloth clamp loading and unloading mechanism to solve this problem. First of all, the scheme of the loading and unloading mechanism of the spring steel cloth clamp is proposed. The mathematical model is established, and the simulation verification is carried out on this basis. Then the structural design is carried out. Finally, the prototype of the loading and unloading mechanism of the spring steel cloth clamp was trial produced, and continuous loading and unloading tests were carried out. The results show that the loading and unloading mechanism can automatically and continuously load and unload the spring steel cloth clips, meeting the design requirements. It also provides a solution for the embroidery machine industry to solve the time-consuming problem of manually loading and unloading spring steel cloth clips.
Experimental Research on Pipeline Corrosion Monitoring Technology Based on FSM
Authors: Qi Yonggang , Duan Rujiao , Fu Zhiqiang , Shi Xiushan 
Published: March 2023

Abstract
The field fingerprint method (FSM), a new online corrosion monitoring method, has a good application prospect. Of all the corrosion defects of pressure pipes, local small corrosion pits are the most commonly seen, and it is also the focus of FSM research. Based on the FSM method, this paper conducts experimental research on the common round and rectangular small corrosion pits of pressure pipes. The results show that the FSM method is sensitive to small volume defects, and the small corrosion pits with the minimum detectable depth of 0.5 mm can accurately reflect the defect growth process, this being of great significance to the safe operation of pipelines.
Bending of shape memory alloy nanobeams incorporating surface effects based on the Euler-Bernoulli beam model
Authors: Li Shoubao , Jia Xiaoli , Zheng Lei , Ke Liaoliang , Yang Jie , Kitipornchai Sritawat 
Published: March 2023

Abstract
Shape memory alloys (SMA) are widely used in micro-electro-mechanical systems due to shape memory effect and hyperelasticity. The surface effects on mechanical properties cannot be ignored because of their small structure size. Based on Euler Bernoulli beam theory and Gurtin-Murdoch surface elasticity theory, the influence of tension-compression asymmetry factors on SMA beams is considered, and a phase transformation mechanical model of SMA nanobeams considering surface effects is established. The effects of surface effects on load, curvature and neutral axis displacement are investigated The study demonstrates that regardless of whether considering the surface effect, the neutral axis displacement initially increases and subsequently decreases with the growth of the dimensionless bending moment. The neutral axis displacement of nanobeams can be significantly affected by taking surface effects into account. When considering the surface effect, the difference in neutral axis displacement of the nanobeam increases as the nanobeam’s size diminishes. Neglecting surface effects will underestimate the bending stiffness of the microbeam.
Failure Hazard Assessment of Three Gorges Ship Lift Drive System Based on Combined Weighting and TOPSIS Method
Authors: Chen Zhuo , Li Quangen , Li Xuefei , Li Zhiyuan , Liu Zhongming , Li Youhua 
Published: March 2023

Abstract
As the core subsystem of the ship lift, the drive system of the Three Gorges ship lift provides power for the operation of the ship lift, and its failure will directly affect the stable and safe operation of the ship lift. In view of the shortcomings of the existing evaluation methods for the failure hazard of the Three Gorges ship lift drive system, such as strong subjectivity and unreasonable weight of evaluation indexes, a failure hazard evaluation method for the Three Gorges ship lift drive system was proposed based on combined weighting and TOPSIS method. The effectiveness and feasibility of this method are verified by simulation of the Three Gorges ship lift drive system, which provides a new evaluation method for failure hazard analysis of key components of the Three Gorges ship lift.
The interactions between incoming shot flow and structural target in a Flap Shot Peening process
Authors: Feng Ruoqi , Lin Musen 
Published: March 2023

Abstract
A novel numerical modeling approach capable of computing and simulating the Flap Shot Peening (FSP) dynamic process of industrial interest was proposed by the coupling of the Discrete Element Method (DEM) and Finite Element Method (FEM). During the process of shots impacting the metallic target, the shot flow and the target were respectively modeled by DEM and FEM, and the interaction between the shots and structure was efficiently evaluated by DEM-FEM. This approach can be employed to rationally control and regulate the FSP multiple parameters, which would induce an appropriate distribution of Compressive Residual Stress (CRS) within the target to provide additional resistance to the treated component. In this paper, a benchmark was first performed to verify the computational method successfully. Further, the influence of variant mass flow rates on the target was also investigated. The result shows that low mass flow rates can be replaced by a higher mass flow rate in case both were able to generate a similar shot effect.
Study on the Influence of Tool Tip Radius on the Tooth Root Strength of Helical Cylindrical Gear
Authors: Lu Daixing , Sha Jiajia , Shen Ye 
Published: March 2023

Abstract
The bending fatigue strength of the tooth is an important index to measure the bearing capacity of the gear. The tooth root transition curve has a great influence on the bending strength of the gear. The profile of the tooth root transition curve depends on the shape of the tooltip. Therefore, the geometry of the tooltip must be considered in the simulation process of tooth profile generation. Contact analysis of helical gears with accurate geometric models is carried out in this paper. After generating tooth profiles machined by tools with different tip radii using MATLAB software, the three-dimensional model of involute helical cylindrical gears is established in CREO, and the stress distribution of gears under diverse load conditions is analyzed by FE software. In the end, it is concluded that the size of the tooltip fillet radius has a great influence on the maximum bending strength of the tooth root, and the strength of the tooth root decreases by increasing the tool tip radius.
A tilting system design and simulation of ground penetrating radar
Authors: DeKun Chen , Yuan Xue , SiYuan Tao , Peng Lan , NianLi Lu 
Published: March 2023

Abstract
In this paper, a tilting system of ground penetrating radar by 5R1C 6-bar linkage mechanism is proposed. The kinematic function of hydraulic cylinder and the output angle is given in explicit format. The quasi-static formulation of the tilting system is proposed to calculate the shaft and revolute force. The simulation of mechanism via ADAMS and an experiment is made to verify the design. The maximum stress is exposed in curved shaft and the worst working condition is the tilt condition. It proves the validity of tilting system that both mechanism and hydraulic system work well in the loading condition and unloading condition.
Design of High Energy Single Longitudinal Mode 355 nm UV Laser
Authors: Li Tianzhi , Guo Chuan , Zhang Chaofan 
Published: March 2023

Abstract
355 nm laser is a widely applied light source, of which the two features mostly used are the damaging effect and propagation characteristic in the atmosphere. Thus, higher laser energy has always been required to perform better damage and provide further propagation range. We demonstrate high energy single longitudinal ultraviolet (UV) laser using a nonlinear optical crystal of lithium triborate (LBO) cut at θ=90° and φ= 37° with sizes of 10 mm × 10 mm × 30 mm in type I phase-matching, the source light from a single longitudinal mode (SLG) inject master oscillator power amplifier (MOPA) operated at a repetition rate of 5 Hz with a pulse duration of 10 ns. The maximum output energy of 0.308 J of 355 nm UV laser was reached through a total pump energy of 1.82 J 1064 nm and 532 nm laser with an nonlinear conversion efficiency of 16.9%. The experimental results prove that the LBO crystal is a reliable candidate for high-energy UV laser generation. The output high energy 355 nm laser has great application potential in material processing, microchip manufacturing and remote sensing.
Design of single cycle current control method based on single-phase full bridge inverter circuit
Authors: Zheng Yan , Sun Jiyuan , Li Pin , Tian Chunlin 
Published: March 2023

Abstract
To achieve accurate control of the large inductive load, a single-phase full bridge inverter circuit topology with a simple structure is proposed. The current control on inductive load is realized by using the single-cycle control method, and the size and direction of the current can be adjusted at any time. The loading part is equivalent to the coil and resistance, the control principle of the circuit is analyzed, and the calculation formula of the duty cycle is calculated. The simulation results show that the designed circuit structure can control the current with a large inductive load
Research and design of a deformation monitoring system for the platform and canopy of a railway station
Authors: Xia Li Yin , Yuan Ma Yin 
Published: March 2023

Abstract
In this paper, the deformation of the platform and canopy of a high-speed railway station is studied, and an online monitoring system for platform canopy deformation is designed to solve the problem of online monitoring of platform canopy deformation. Due to the conventional one-dimensional measurement has been difficult to meet the needs of high-speed railway industrial production and daily life. Nowadays, laser radar and binocular cameras for three-dimensional data measurement have gradually emerged. At present, there is almost no three-dimensional data acquisition equipment with high measurement accuracy, low price, and a high degree of automation in the market. Given the lack of this equipment in the market, this paper presents a three-dimensional data acquisition system based on a laser rangefinder. By collecting, processing, and analyzing the data of the platform and canopy, the purpose of prediction can be achieved, and then the abnormal response, damage, and degradation of the structure can be found in time. The study shows that the monitoring system is helpful to detect deformation and give early warning, and effectively prevent the occurrence of hazards.
Optimization Design of Thin Wall Angular Contact Ball Bearing Based on MATLAB Genetic Algorithm
Authors: Chen Yulian , Li Junwen , Chen Chanyuan 
Published: March 2023

Abstract
The bearing for industrial robots is desired to have a long service life. To address that, an optimization study was conducted on a thin wall angular contact ball bearing used for a robot. Firstly, an optimization model was established with the basic rated life as the objective function and the curvature radius coefficient of the inner ring groove, curvature radius coefficient of the outer ring groove, ball diameter, pitch diameter, and the number of balls as the design variables. Then, taking the angular contact ball bearing ZR76/82C as an example, the optimization model was solved quickly based on a genetic algorithm via MATLAB software in two ways: calling the ga function and optimization toolbox, and the optimal structural parameters of the bearing were obtained. After the optimization, the basic rated life of the bearing was increased by 52%. The orthogonal test optimization design method was applied to validate the calculations, and the validation results showed that the two optimization results were very close to each other. The results show that the two approaches based on MATLAB genetic algorithm are efficient and feasible for solving optimization issues, and are of reference value for the study of solving other optimization issues.
Methods for Non-destructive Testing of Welding Residual Stresses in Aluminum Alloys
Authors: Liu Huaying , Gan Shiming , Zhang Jiaxin 
Published: March 2023

Abstract
There will be large residual stress after welding, and the residual stress will affect the service life of the aluminum alloy welding structure. Therefore, aluminum alloy welding residual stress needs to be accurately detected. Compared with the lossy method, the nondestructive testing method can produce negligible damage to aluminum alloy, which will not affect the reuse of aluminum alloy and can detect the residual stress. This paper summarizes the nondestructive testing methods of welding residual stress in aluminum alloy and their advantages, disadvantages, and applicability, which lay a foundation for rapid nondestructive testing of welding residual stress in aluminum alloy.
Noise source separation and identification of excavator cab based on EEMD-PCA-ICA-ST
Authors: lin Jianpei , Zhu Jianxin , liu Qiang 
Published: March 2023

Abstract
In order to effectively separate and identify the noise source of excavator cab, this paper adopts the methods of ensemble empirical mode decomposition (EEMD), principal component analysis (PCA), independent component analysis (ICA) and S-transform (ST) to study. Firstly, EEMD is used to decompose the single channel noise signal collected at the driver’s position into multiple intrinsic mode functions (IMF); Secondly, PCA is used to reduce the dimension of IMFs to remove the redundant IMF; Next, ICA processing is performed on the remaining IMFs to obtain independent IC components; Finally, S-transform is used to analyze the time-frequency of IC component, and the source of IC component is identified by prior experience. The results show that the main noise sources are the vibration radiation noise of related parts in the cab, the combustion noise of diesel engine and the fan noise. After identifying the main noise sources, the next step is to study the contribution of these noise sources, which provides a new idea for noise control.
Unmanned aerial vehicle fuel tank structure design optimization based on Flow-EFD fluid simulation
Authors: Deng Dingqi , Jiang Liang , Wang Hui , Gao Guangtuo 
Published: March 2023

Abstract
Fuel quantity indication and fuel low level warning design is an important technology for unmanned aerial vehicle design with long distance flight capability. Since the size and shape of overflow holes opened on fuel tank rib structure impact the fuel leakage rate and in turn impact whether fuel low level warning will be triggered at expected time, this article use RNG-turbulence model based on Flow-EFD fluid simulation to compare three different overflow hole design schemes and get the conclusion that several rectangular holes design has negative impact on fuel level descending and will not cause nuisance fuel low level alert under large pitch angle.
The Research of Reliability Evaluation Method Based on PoF
Authors: Xie SH , song Q Q , Liu J M , Ga Y J 
Published: March 2023

Abstract
Combining with the practical engineering case, this paper decomposed and analyzed the process of electronic products’ reliability assessment based on the Physics of Failure (PoF) method. The first step is to build a digital prototype model and then a PoF model. The second step is to use the Monte Carlo sampling method to obtain the failure samples of different fault points based on the PoF model. The third step is forming the failure DFs by fitting the failure samples. The fourth step is using the failure DF to calculate the Time to Failure (TTF)of the components. Finally, the paper can obtain the time of the TTF and the failure DF by applying the competitive failure principle. Compared with the reliability evaluation method based on test data, the reliability evaluation method based on PoF is more economical and efficient.
Photovoltaic Power Prediction Method Based on Combined Similar Days and BiLSTM
Authors: Zhang Xiangying , Li Rui 
Published: March 2023

Abstract
The PV power output between similar days has great similarity. It can improve the accuracy of the prediction results based on valid similar days. In this paper, we proposed a novel combined similar day selection method based on multiple periods. Firstly, the meteorological characteristic quantity is established, and then the historical similar period is selected by using the combination index of grey correlation degree and cosine similarity in different periods, and multiple combined similar days are constructed. Then, using the historical power value and meteorological data of the corresponding period, the photovoltaic power of the prediction day is predicted by bi-long short-term memory (BiLSTM) neural network in different periods. The photovoltaic power prediction results of the day to be predicted are corrected according to the power errors of multiple combined similar days. The results show that this method has better prediction accuracy.
Busbar Voltage Control of DC Microgrid Group Based on Whale Optimization Algorithm and Fuzzy Control
Authors: Zhao Guanhao , Xiao Liexi , Zhou Hui 
Published: March 2023

AbstractAiming at the problems of system response lag, poor anti-interference ability, and poor recovery ability of fuzzy dual closed-loop control, this paper proposes a fuzzy dual closed-loop control based on a whale optimization algorithm to optimize the control effect by simulating the foam attack mechanism of humpback whales, solving mathematical and structural optimization problems, adjusting quantization factor and scaling factor, and adjusting PI parameters in real-time. Matlab/Simulink is used to create the model. The experimental results show that the system has a quicker reaction, smaller overshoot, greater anti-interference capability, and improved robustness in various situations under the new control strategy.
Design of a Taiji-like Dual-band Microstrip Patch Antenna Loaded with Bagua Parasitic Patch
Authors: Wang Shike , Xia Dan , Lv Lianrong , Qin Juan , Wang Meng , Chen Mengdan , Wang Biao , Li Lei 
Published: March 2023

Abstract
This study proposes a Taiji-shaped microstrip patch antenna without affecting its size and design complexity. The radiation patch adopts a Taiji-like shape design, and the traditional Chinese Bagua-shaped parasitic element is loaded on the periphery of the radiation patch on the surface of the dielectric substrate to optimize the impedance matching further and improve the gain. The software HFSS15.0 is used to simulate the antenna and compare the results. The results show that the antenna achieves dual-band characteristics at 2.45GHz and 5.04GHz, has an impedance bandwidth of 110MHz and 250MHz, and has a positive gain of 7.13dB. The proposed antenna is suitable for the field of wireless communication.
High-throughput satellite flexibility design and modeling
Authors: Zhang Cheng , Zhou Yejun , Qin Pengfei , Zhao Ziqi 
Published: March 2023

Abstract
The paper presents a high-throughput satellite flexibility modeling and analysis method. The described method gives the design basis for choosing flexible satellite payloads such as transparent digital processors (DTP) for high-throughput satellites. The algorithm in the paper takes different time demands within the high-throughput satellite beams and different area demands between beams as input analyzes the capacity matching rate under the onboard resource constraint in different application scenarios. It also gives the conclusion of whether the satellite chooses a flexible design or not. When the variance of inter-beam demand and design capacity in the coverage area exceeds a given limit, the flexible payload is selected to achieve a higher capacity matching ratio and lower satellite design and usage cost. When the variance of demand and beam design capacity is less than the given limit, the variance of inter-beam demand in the coverage area is smaller, and the satellite system without flexible design is selected considering the full satellite capacity and cost.
Design and Analysis of Walking device of Multi-function Ecological Planting Grass Cart
Authors: Qi Xuemei , Wu Yunjie , Zhang Jian , Wang Yuhao 
Published: March 2023

Abstract
Aiming at the problems of complex structure and difficult control of the walking device of the grass planting cart, a walking device of the ecological grass planting cart was designed, including the frame, walking wheel, profile device, depth limiting device, etc. The device limits the depth of three blocks and simulates the shape of the working ground. From the perspective of the soil contact force field and displacement field, EDEM software was used to simulate the discrete elements of the driving wheel and soil suppression effect. It can be seen from the analysis results that the driving wheel has a good suppression effect on soil particles. The depth-limiting effect of the walking device is simulated, and the results show that the distribution area and depth of the contact force field between the three-gear trench device and soil particles are different, and the depth-limiting effect is good.