bluuebunny/crossref_metadata_2025_split huggingface dataset:
Structural Design and Driving Experiment of an Electromagnetic Drive System for Microrobot
Authors: Zhang Zhaopeng , Li Hao 
Published: July 2024

Abstract
Controlling the exact positioning and direction of microrobots is a significant challenge in the prospect of microrobot actuation. To solve this problem, the current study created a system that combines solenoid and permanent magnets as an electromagnetic drive mechanism. This system uses a stepping motor to effectively manage the placement of the permanent magnet in the terminal area of solenoid, enabling precise control of its movement. Additionally, a programmable power source is used to adjust the microrobot’s orientation. Driving tests were conducted on a simulated hepatic vein, achieving speeds of up to 1.3mm/s. These results provide valuable references for optimizing future electromagnetic actuation systems.
Research and Implementation of Robotic Arm Positioning and Grasping Based on Visual Guidance
Authors: Liu Qiang , Wang Xinwei , Liu Fengli , Mu Li 
Published: July 2024

Abstract
This paper proposes a robotic arm vision guidance system based on the ROS platform, which combines the Hikrobot Robotics 2D vision sensor with the Xinsong GCR5 robotic arm to successfully realise vision-guided robotic arm positioning and grasping. Camera calibration, hand-eye calibration, and deep learning techniques are used to establish an accurate transformation relationship between the base coordinate system of the robotic arm and the camera coordinate system to achieve efficient target goal recognition and localisation. Adopting the MoveIt framework and RRT-connect algorithm, the robotic arm can flexibly plan the movement path and successfully complete the target grasping, which provides the theoretical basis and practical experience for robotic arm intelligent grasping.
Effects of Ultrafine and Homogenization Process on Microstructure and Properties of H13 Die Steel
Authors: Fan Zhenyu , Wang Huizhen , Zhai Yuewen , Jiang Chao , Guo Shuo , Zhang Zibo , Zhou Leyu 
Published: July 2024

Abstract
The mixed grain structure was found in H13 die steel due to improper production process parameters, and mixed grain structure has adverse effects on the performance of H13 die steel. The appearance of mixed grain structure is analysed. The heredity of mixed grain structure in H13 die steel was eliminated by using ultrafine and homogenization processes. The characteristics of the microstructure of H13 die steel were investigated, and mechanical properties were tested. The results indicated that the mixed grain structure transformed into fine equiaxed grains after the ultrafine and homogenization process and the average grain size of austenite is about 20.7 μm. After quenching and tempering treatment, the hardness of the sample reached 47.1 HRC, and the impact absorption energy was 10.8 J.
A High-pressure Relief Valve Life Measuring System Based on LabVIEW
Authors: Rui Jing , Lidong Zhang 
Published: July 2024

Abstract
High-pressure relief valves have been widely used in machinery, chemical industries, shipbuilding, and other industries, and their service life is a very important performance index. This paper presents a service life measurement system of marine high-pressure relief valves. The system mainly uses a virtual instrument to carry out remote automatic start/stop control and valve position report for the start/stop of the relief valve, confirm the start/stop status, and count the start/stop times within the specified time to reflect the service life of the relief valve.
Reliability Analysis of Hinged Hydraulic System of Remanufactured EPB Shield Machine
Authors: Li Zhibo , Li Yunpeng , Zhao Jingyi , Li Hailong , Wang Bolan 
Published: July 2024

Abstract
To verify the reliability of the Earth Pressure Balance (EPB shield machine) hinged system, firstly, this paper analyses the reliability of the remanufactured EPB shield machine hinged system and then aims at the problem of the high failure rate of the hinged system in EPB shield machine. A fault tree model was established, and the qualitative and quantitative analysis of the fault tree was carried out. Finally, it is determined that the main cause of the oil cylinder malfunction in the hinged system is the insufficient pressure caused by the malfunction of the solenoid valve’s directional switching.
Miniaturized fundus camera based on cross-polarization and in vivo verification
Authors: Yang Luyao , Zhao Qingliang 
Published: July 2024

Abstract
As an important part of clinical examination, fundus examination can reveal early symptoms of both eye and chronic physical diseases, thus helping doctors and automated screening to diagnose and treat in time. However, widely used portable fundus cameras are often disturbed by stray light, which seriously affects the quality of fundus imaging, extremely detrimental to the clinic. In this work, we have successfully built a miniaturized fundus camera based on the cross-polarization method, which simplifies the system design while guaranteeing high-quality imaging compared with other methods. The simulation results of the optical path and the imaging effect in vivo show that cross-polarization has a powerful effect on eliminating stray light. Our approach provides a new solution for the field of fundus photography and an application-level advance for the popularization of medical resources.
Influence of Wire Feeding Speed on the Morphology and Properties of Stainless Steel Laser Welding Joints
Authors: Liu Shuai , Luo Ziyi , Liu Weiqing , Wang Yuzheng , Cai Detao 
Published: July 2024

Abstract
Using laser filler wire welding technology, welded joints were produced at varying wire feeding speeds. The microstructure and mechanical attributes of these joints were then examined through optical metallography, scanning electron microscopy, universal tensile testing, and microhardness testing. It demonstrates that superior surface formation and defect-free welded joints can be achieved through the filling wire welding process. The main components are austenite and ferrite, with slightly varying morphology and content. Through the results of tensile tests and fracture microstructure scanning, when the rate of wire supply is 2.0 meters per minute, the tensile strength reaches 650 MPa. The second phase particles were discovered in the fracture scan. According to microhardness measurements, the overall hardness of the welded joints at different wire feeding speeds is higher than that of the base material.
An Improved Predictive Controller for PMSM based on Dual-Channel Feedback
Authors: Lu Junhao 
Published: July 2024

Abstract
High-performance and high-power-density DC servo drives of permanent magnet synchronous motors (PMSM) are applied to the military, especially in airborne optoelectronic pods, light mines, and launch turntables in the aerospace field. The above application scenarios require the volume of drivers to be smaller and have large power outputs. In the field of pods and light mines, high bandwidth and good tracking performance are required, especially in terms of steady-state accuracy. Since light mines are used for target tracking scanning, the errors at the end of the optical rotating mechanism are amplified tens or even hundreds of times after transmission through the line of sight to the target end. Therefore, the requirements for steady-state accuracy are extremely high. In this article, a predictive control method is proposed, using a sliding mode variable structure controller to make up for the error arising from system parameter changes in predictive control. Finally, a dual-channel rotary transformer feedback position coarse-fine combination algorithm method is studied to reduce the angular measurement error and further improve steady-state accuracy.
Study of LC oscillation based on excitation source of two-stage full-bridge structure
Authors: Hao Sirui , Wang Xuhong , Meng Qingke , Hu Shanchao 
Published: July 2024

Abstract
Nuclear magnetic resonance logging transmitting circuits must face the harsh operating environment of high voltage and high frequency. To reduce the voltage and current tolerated by the switching devices in the circuit and minimize the circuit loss, a high-frequency, high-voltage pulse transmitting circuit based on a two-stage full-bridge structure is designed in this paper. A new strategy for pulse excitation oscillation is proposed. The proposed strategy is based on the decision to end the excitation at the moment of peak voltage and the condition for limiting peak charging current (3.2). Finally, the circuit topology and excitation strategy proposed to achieve the overall optimal performance of sustained voltage oscillation with a peak voltage of 1180 V, precisely matching the transmitting frequency of 481 kHz and suppressing the charging current below 10 A.
Study on Optimization of Placement Method for Transmission Line Monitoring Devices Based on Probability of Meteorological Disasters
Authors: Zhang Guoqiang , Wang Jian , Jiang Wendong , Li Mengxuan , Liu Jinghua , Ren Shuai 
Published: July 2024

Abstract
To ensure the reliability and safety of the power grid system, it is of great significance to carry out electric meteorological monitoring for transmission channels. In this paper, a method for optimizing the placement of transmission line monitoring devices based on the probability of meteorological disasters is proposed. By considering the climatic characteristics near the transmission line, the probability of occurrence of adverse meteorological faults for each transmission tower in the transmission line is analyzed and calculated by using existing meteorological and GIS elevation data. Meanwhile, the historical failure data and voltage levels of transmission lines are combined to achieve the optimization of the installation position of monitoring devices in transmission channels. This method was applied to a 220 kV transmission line for practical analysis, achieving dense monitoring in areas with high failure rates and sparse monitoring in areas with low failure rates.
Voltage Control in Distributed Photovoltaic Power Distribution Networks Using Multi-Agent Deep Reinforcement Learning
Authors: Xin Peiqi , Wang Hongtao , Wang Haobo 
Published: July 2024

Abstract
This study introduces a unique method employing the Multi-Agent Deep Deterministic Policy Gradient (MADDPG), a sophisticated deep reinforcement learning algorithm, for efficient voltage control in photovoltaic (PV) power distribution networks. The algorithm’s design emphasizes minimizing the need for communication and effectively managing delays, which are pivotal in ensuring consistent and reliable control in environments with fluctuating renewable energy sources. In simulations using the IEEE-33 power distribution system, the research demonstrates the algorithm’s ability to ensure stable and efficient network functioning, even under varying environmental and load conditions. This highlights its potential as a robust solution for modern and renewable energy-integrated power systems.
Switching control method for collaborative robots based on hybrid Petri nets
Authors: Shang Yujia , Lu Tielin 
Published: July 2024

Abstract
Aiming at the different working conditions of the mixed production process of collaborative robots, three kinds of controllers with the structure of sliding mode controller, backstepping controller and feedback linearisation are designed respectively, and a control structure switching method based on Petri net is proposed. The method is able to achieve better control performance by switching into different control methods to realise the relevant work tasks (tracked motion trajectories) according to the different work tasks (tracked motion trajectories) to be accomplished by the collaborative robots.
Suspended garbage detection of transmission lines based on improved YOLOv8
Authors: Wang Sixing 
Published: July 2024

Abstract
The problem of garbage suspension in transmission lines is an important factor affecting the reliability of the power grid. With the application of artificial intelligence in the detection of abnormal objects in transmission lines, the detection efficiency, accuracy, and stability have been improved to a certain extent. However, the accuracy of detecting suspended garbage in transmission lines is relatively poor. This article uses an improved YOLOv8 algorithm for suspended garbage detection, replacing the original loss function with the SIoU loss function, which improves the iteration speed and detection progress of the model. In addition, the use of depthwise separable convolution instead of the original dilated convolution compensates for the problem of information loss when size objects may exist, greatly improving the model’s ability and accuracy in identifying suspended garbage quality and laying the foundation for improving the accuracy of garbage detection in transmission lines.
The Design and numerical simulation of a 3D-printed flexible capacitive pressure sensor with a composite structure
Authors: Chen Yike , Zhang Hongbo , Gao Yang , Yin Ruixue 
Published: July 2024

Abstract
Flexible pressure sensors are crucial for many areas, such as electronic skins, human motion, robot monitoring, and medical treatment. However, conventional manufacturing methods limit the speed and accuracy of manufacturing sensor dielectric layers. In this paper, a unique capacitive pressure sensor with a composite structure is introduced that can be fabricated by 3D printing technology. The structure, which has 3D hierarchical pyramids microstructures and porous substrate, can be directly fabricated by a DLP 3D printer. This allows flexible dielectric layers to be fabricated quickly while maintaining their superior performance. The dimension of the produced sensor is 10×10×4.5 mm3. The sensor’s design process, numerical simulation, and performance are provided and elucidated. The performance of the sensor is measured between 0 and 1 MPa. It has low hysteresis and high sensitivity (6.83 MPa−1 within the scope of 0 to 0.5 MPa and 2.56 MPa−1 within the scope of 0.5 to 1 MPa).
Model Establishment and Parameter Identification of Remotely Operated Vehicle (ROV)
Authors: Zhang Yelei , Yin Baoji , Jiao Huifeng , Zhang Jian , Yan Fei 
Published: July 2024

Abstract
To study the dynamic characteristics of remotely operated vehicle (ROV) underwater motion, a transformation matrix between the carrier coordinate system and the inertial coordinate system was established, and the rigid body dynamics model of the ROV was derived by using the Newton-Euler equation. According to the results of the ROV experimental prototype in this article, the dynamic model is simplified based on the force, motion characteristics, and structural characteristics. In the pool experiment, based on the propeller dynamic model, the least squares method was used to identify the parameters of the heading and vertical dynamic models, and through the experimental results under step control signals of different amplitudes, they were compared with the models under the same control signal. The output is subjected to error analysis. The experimental results show that the error between the theoretical value and the experimental value is small, verifying the accuracy of the ROV dynamics model established in this article.
Load voltage study of LCC-S type wireless energy transmission system based on phase shift control
Authors: Bao Pengfei , Xu Fei 
Published: July 2024

Abstract
When the light load is applied in an LCC-S type wireless power transmission (WPT) system, the system does not have constant voltage characteristics, which affects the normal use of power equipment. If a DC/DC converter is used to regulate the voltage at both ends of the load to keep it constant, it will increase the size and cost of the system, and the efficiency is also reduced. For this reason, in this paper, phase-shift control is carried out based on the LCC-S type WPT system, and the LCC-S resonant compensation network is first modeled and analyzed in terms of its working principle. Then, the principle of phase-shift control is analyzed, the relationship between the drive signal phase-shift angle and the load voltage in the phase-shift control is deduced, and finally, a simulation model is built in Matlab/Simulink to verify the correctness of the control strategy.
Study on the mathematical model of the novel drum worm pair
Authors: Li Shuangcen , Xiao Linglin 
Published: July 2024

Abstract
A lot of work is needed to investigate the design method of planar internal gear enveloping drum worm (PIGEDW). Firstly, based on the gear meshing theory, the meshing equation is deduced. Secondly, the PIGEDW mathematical model is established by MATLAB. Finally, the influence of the inclination angle of the generating plane on the meshing performance of PIGEDW is analyzed. The results show that appropriate changes in geometric parameters are beneficial in enhancing the performance of PIGEDW, which provides a way to optimize its design.
Utilizing wavelet packet decomposition to locate the damage of composite structures in strong-noise environment
Authors: Wang Minjie , Zhu Wujun , Xiang Yanxun 
Published: July 2024

Abstract
This paper proposes an approach for damage localization in a strong noise environment based on wavelet packet decomposition. Experiments were conducted to locate damage in composite structures to verify the method. The signal was decomposed by a wavelet packet, and the damage information was identified through wavelet packet energy ratio deviation, defined as the damage factor. The proposed method effectively localizes the damage and directly captures the original signal without the need to preprocess the strong noise signals. Additionally, it bypasses the complex process of extracting reflected signals, demonstrating substantial potential for detecting and identifying composite damage in noisy environments.
Research and Analysis of TC4 Titanium Alloy Cutting Based on Crystal Plasticity Theory
Authors: He Tao , Tang Yaxin , Wu Hongbing , Liu Yongyue , Chen Jindong 
Published: July 2024

Abstract
Based on the crystal plasticity theory, the changes in TC4 titanium alloy before and after cutting, especially the changes in cutting forces, chip temperature, morphology, and quality, were analyzed in this study. Initially, a polycrystalline plasticity model for the TC4 titanium alloy was established. Following that, a crystal plasticity polycrystal finite element cutting simulation model is developed to perform cutting simulations. This model represents the mechanical behavior of the micro grains of TC4 titanium alloy during the deformation and cutting processes. Further, it validates the internal grain plastic deformation and the effect on the metallography of TC4 titanium alloy before and after cutting. The results show a good consistency between experimental and simulation data. The grain size increases gradually from the center to the edge of the cutting area, with the phenomenon of equiaxed grains becoming more apparent, leading to the formation of elongated fine grains. During the cutting process, grains interlock and fracture, exhibiting strong anisotropy.
Analysis and Experimental Study of Puncture Leakage Characteristics of Pump-driven Fluid Loop Radiator
Authors: Huang Lei , Han Haiying , Yang Min , Che Bangxiang , Niu Chunyang , Wang Dewei , Zheng Hongyang , Yu Xingang 
Published: July 2024

Abstract
The radiator is a key component of the pump-driven fluid loop in the thermal management system of spacecraft, and it has a high probability of being penetrated by Micro-Meteoroid and Orbital Debris (MMOD). Therefore, for long-life manned spacecraft such as space stations, the study of the leakage characteristics of radiators after breakdown is an important work that needs to be solved urgently. In this paper, the leakage state characteristics of the emitter after leaking are analyzed, and a mathematical model is established to calculate the relationship between the aperture and the leakage volume rate. Finally, the accuracy of the mathematical model is verified by experiments.
Experimental Study on Mechanical Properties of Reinforcement under Low-Temperature Impact
Authors: Yang Fan , Pan Jiawen , Zhang Bochao 
Published: July 2024

Abstract
Ammonia is an important carrier of hydrogen energy, and the large-scale storage of liquid ammonia is the next trend of cryogenic energy storage. At present, the international mainstream liquid ammonia tank is generally about 50, 000 m3. The outer storage tanks generally adopt a metal structure, and the material applied for larger concrete full-capacity tanks is worth doing further research. Steel reinforcement bars (rebar) are an important construction material for full-capacity cryogenic energy storage tanks. The performance of rebar is an important index in the process of designing the strength of building structures. The factors affecting the properties of rebar are diverse, and reasonable control of each influencing factor can improve the performance of rebar used for liquid ammonia storage tanks. This paper carries out the study on the mechanical properties of the steel reinforcement bars from the concrete of the main container under low temperatures for storing liquid ammonia. Through experimental research on the failure of steel used in external tanks, it has been shown that temperature has a significant impact on the ductile-brittle transition. Further treatment can effectively prevent the brittleness of steel bars, improve the safety and reliability of storage tanks at low temperatures, and is of great significance for the design and construction of subsequent large liquid ammonia storage tanks.
Effect of Strontium Modification on Microstructure and Mechanical Property Al12SiCuMgNi Alloy in Squeeze Casting
Authors: Ji Kaiwen , Li Longfei , Liang Junning , Li Chunming , Zhao Xuesheng , Han Qinghua , Chen Lin , Zuo Lingli , Zhang Yang 
Published: July 2024

Abstract
The Al-Si series alloys, which have excellent fluidity and castability, are the most common aluminum material in the casting industry. However, the coarse eutectic Si phase with laminar morphology leads to the stress concentration of material and has a detrimental effect on the mechanical properties of aluminum alloy components. In this study, the Strontium (Sr) modifier was added to Al12SiCuMgNi alloy and the effect of Sr on microstructure and performance of Al12SiCuMgNi in squeeze casting was investigated. The experimental results show that the eutectic Si phase was well modified to fibrous morphology. Although the yield strength (YS) was leveled, the ultimate tensile strength (UTS) and elongation (EL) of the alloy were obviously enhanced after Sr addition. When the 0.012wt.% Sr was added to Al12SiCuMgNi alloy. The YS, UTS, and EL of alloys were up to 311 MPa, 401 MPa, and 3.4%, respectively. Moreover, the microstructure and performance of Al12SiCuMgNi alloy in the hot forging process were also compared to Al12SiCuMgNi alloy with and without Sr addition in squeeze casting. It is concluded that the Al12SiCuMgNi alloy in hot forging shows higher ductility (4.7%) and lower strength than Al12SiCuMgNi alloy in squeeze casting.