bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on heat dissipation of torsional vibration damper for engine crankshaft
Authors: Chen Rongchuang , Qiu Zexu , Wu Changbin , Gan Xingang 
Published: July 2024

Abstract
High temperatures in torsional vibration dampers can cause silicone oil to fail, increasing crankshaft vibration and shortening component fatigue life. Accurate prediction of the damper temperature field is key to the manufacture of highly reliable torsional vibration dampers. This study establishes the relationship between temperature, torsional vibration amplitude, silicone oil viscosity, rotational speed, housing and inertia ring clearance, and heat generation power based on Comsol. A bench test was carried out on a 6-cylinder inline diesel engine. The simulated temperature profile matched the tested result in terms of trend and relative value, and the established model could accurately predict the temperature field of the engine crankshaft torsional vibration damper.
Surface properties of laser-woven magnesium alloys based on dot-matrix processing
Authors: Chen Jianli , Fan Yaohua , Wan Libo , Wu Weifeng 
Published: July 2024

Abstract
This paper investigates the enhancement of surface properties of magnesium alloys through infrared nanosecond laser processing with a focus on creating hydrophobic and wear-resistant surfaces. By manipulating dot-matrix microgroove sizes on the magnesium alloy surfaces, the research evaluates the influence on hydrophobicity and mechanical durability. The experimental results reveal that larger microgrooves contribute to increased hydrophobicity due to decreased liquid-solid contact, confirmed by static contact angle measurements which align with predictions from the Cassie-Baxter model. Mechanical durability tests, involving sandpaper abrasion, demonstrate that the surface integrity is maintained despite wear, attributed to the effective laser-texturing approach. The hydrophobic surfaces were achieved through a low-surface-energy modification using fluorosilanes, followed by a thermal treatment to ensure durability. The findings highlight the potential of this processing method in applications requiring robust, hydrophobic materials such as biomedical and engineering materials, offering a cost-effective and efficient solution for industry-scale problems. This work not only extends the understanding of surface engineering via laser texturing but also provides a novel approach for optimizing surface properties crucial for advanced material applications.
Numerical method determining the time-dependent position of a minority phase sphere in the Fe-Cu alloy droplet
Authors: Li Mei , Peng Yinli , Tian Lili , Liu Gang , Xie Fang 
Published: July 2024

Abstract
A numerical method was developed to track the dynamic positions of the L2 phase sphere inside the Fe-Cu alloy droplet. Firstly, the temperature field distribution within alloy droplet was calculated, and the variation in thermal gradient was analyzed. Secondly, the migration behavior of the sphere was analyzed based on Marangoni convection. Finally, the theoretical position of the 10 μm sphere was determined. The results demonstrated that there is a little difference in temperature between the center and the surface of the droplet, but its gradient is very different. Moreover, the maximum migration times for the L2 phase sphere were determined to be ~0.02 s, 0.07 s, and 0.14 s within 300μm, 600μm, and 900μm alloy droplets, respectively. In addition, it was also found that the same-sized spheres can reach the same relative position, i.e., 0.485R. This means the final position of the sphere within the different alloy droplets is independent of the droplet size.
Nanosecond laser-assisted fabrication of Ti6Al4V surfaces with gradient wettability and robust cross-linked microstructures
Authors: Chen Jianli , Fan Yaohua , Wan Libo , Wu Weifeng 
Published: July 2024

Abstract
Surfaces with gradient wettability outperform singular superhydrophobic surfaces in terms of self-cleaning efficiency, anti-contamination properties, and fluid manipulation. These attributes offer extensive application potential across various industrial and scientific domains. This study introduces and employs nanosecond pulsed laser ablation to create wettability gradient surfaces on Ti6Al4V alloys, featuring robust cross-linked frame microstructures. Experimental results demonstrate that by varying the ridge width (w), associated with the liquid-solid contact fraction, we can achieve varying wettability and mechanical durability in these cross-linked frame microstructures. Wettability tests indicate static contact angles ranging from 150.7° to 105.45°. Furthermore, the sandpaper linear abrasion test illustrates a decrease in material wear rate with an increase in w. Under similar test conditions, the proposed surfaces demonstrate superior mechanical durability compared to two other prevalent wettability surface structures. The proposed surfaces, efficiently and eco-friendly produced through nanosecond laser fabrication, hold tremendous potential for diverse applications.
Research on new distributed distribution network hidden fault remote automatic recovery technology
Authors: Liang Lingyu , Zhang Huanming , Zhao Xiangyu , Cao Shang , Huang Wenqi 
Published: July 2024

Abstract
To solve a series of chain reactions in which a fault in the distribution network triggers the shutdown of other components, a new distributed distribution network hidden fault remote automatic recovery technology research is proposed. The traditional chain fault model about line protection describes that when a fault occurs on one or some lines of the system, the line protection devices will operate with a certain probability, and the misoperation or inappropriate action of these line protection devices will lead to the expansion of the fault and ultimately form a wide range of power outages. This study quantitatively gives the interaction relationship between the components in the system. Firstly, the difference between the distribution network chained fault and the main network chained fault mechanism is analyzed; secondly, the topology of the distribution network is modeled; then, the fault transfer model of the distribution network and the chained fault model based on the line dynamics model are constructed based on this model; finally, the detailed distribution network chained fault algorithm process is given based on the proposed model.
Research on high-resolution capacitance detection circuit based on T-type network
Authors: Yin Zhenqing , Liu Hong , Hao Yuchao 
Published: July 2024

Abstract
The capacitance detection circuit is a key component of the servo circuit of the quartz flexible accelerometer, which needs to ensure high-precision capacitance detection. The small capacitance change of the quartz flexible accelerometer pendulum will be affected by the noise of each device in the servo loop. To solve this problem, we design a single carrier modulation and demodulation capacitance detection circuit based on a T-type network from the capacitance detection model of a quartz flexible accelerometer. We established a circuit noise model, quantitatively analyzed the noise of the entire capacitance detection circuit from the theoretical level, and obtained the equivalent capacitance noise of the circuit. The rationality and effectiveness of the high-precision capacitance detection circuit are verified by theoretical calculation. We also verify the accuracy of the theoretical calculation through simulation and obtain the signal-to-noise ratio of the circuit. Finally, we prove that the scheme is a high-precision capacitance detection scheme.
Parallel circuit currents in stator windings of a pumped storage power station
Authors: Du Shiyue , Li Hanlin , Shang Xin , Li Jiayao , Lang Yecun 
Published: July 2024

Abstract
In a pumped storage power station, equalization currents between the stator windings in phase are greater than the expected calculated value. Several 3D and 2D finite element calculations have been performed in this paper to evaluate the additional leakage reactance of the end winding for the different parallel paths. The calculation shows that the distribution of windings in the power plant leads to different leakage reactance values in the stator slots between parallel branches, resulting in a balanced current. The occurring equalization currents do not represent an issue for machine safety as they are not connected to machine asymmetries and do not lead to additional machine vibrations.
Research on SM-ADRC of BLDC motor based on GWO algorithm
Authors: Cheng Xuqian , Ni Xiaolong , Zhang Guochao 
Published: July 2024

Abstract
In recent years, the application of BLDC motors in all walks of life has become more and more extensive, and the precision requirements of the motor are also higher and higher. This paper proposes a method of ADRC and SMC, and the GWO algorithm is used to adjust parameters. Simulation graphics show that this method can enhance the control precision of BLDC motors.
Research on continuous commutation failure suppression strategy for multi-feed DC transmission system considering harmonic characteristic factors
Authors: Feng Qian , Zeng Ping , Zhou Desheng , Du Zhaoxin , Guo Shaodong , Yang Xiu 
Published: July 2024

Abstract
Regarding the sustained issues of commutation failures in the hybrid double-fed DC system encompassing Line Commutated Converter High Voltage Direct Current (LCC-HVDC) and Modular Multilevel Converter High Voltage Direct Current (MMC-HVDC, from the perspective of harmonics, the harmonics in the voltage waveform of the AC bus on the inverter side are analyzed. Besides, a commutation failure suppression strategy for the hybrid doubly-fed DC transmission system based on the minimum shutdown area is designed, in which the setting value of the shutdown angle of the harmonic is considered in the minimum shutdown area. The reactive power is obtained by attaching the setting value to the reactive power control link of MMC-HVDC, and the simulation analysis in PSCAD verifies that the strategy can make the MMC-HVDC output more reactive power during the fault in the weak AC system. Increasing the shut-off margin of the manifold reduces the potential for continuous commutation failures in LCC-HVDC.
The monitoring system of running state data of converter station equipment based on sensor information and 3D positioning algorithm
Authors: Huang Weijie , Wei Zhiwen , Wang Liuhuo , Pan Wei , Zhong Qihao 
Published: July 2024

Abstract
The stable operation of multiple equipment in the converter station can ensure the safety of the DC transmission system. Once the fault occurs, it will pose a threat to the safety and stability of the power grid. It is necessary to monitor the running state of all kinds of equipment, and study the monitoring system of the running state data of the converter station equipment based on sensor information and a three-dimensional positioning algorithm. In terms of hardware design, TCP and IP communication protocols are used to connect the sensors, and the sensors are arranged according to the vibration conduction standard, constituting a three-layer monitoring architecture of monitoring center, sensor, and equipment. The sensor module is connected by interface, and the structure of the connecting control board for sensor data transmission is set to increase the flexibility of sensor nodes. In software design, the basic information of converter station equipment is corresponding to sensor technology, and the database of operating equipment is established. A three-dimensional positioning algorithm is used to determine the data output form, detect the running state data of the converter station equipment, and complete the system design. The experiment takes various types of running data as the test object. Under the system application in this paper, different running data can be correctly classified and data monitoring under various states can be realized, which has application value.
A comprehensive optimization method for dual redundancy aviation electric propulsion control system
Authors: Jiang Wang , Fan Xinyue , Zhang Yu , Wang Shuli , Liu Mengkai 
Published: July 2024

Abstract
This paper comprehensively optimizes and improves the traditional vector control method to improve the control performance of dual-redundancy electric aircraft and ensure the stability of its system operation in complex meteorological environments. First, the PI controller of the speed loop is replaced with the designed fuzzy PI controller, and its quantization factor and scale factor parameters are adjusted using a beetle antennae search algorithm (BAS) to enhance the system’s ability to respond quickly and resist interference. Secondly, a sliding mode load observer was designed to feed forward the observed values to the speed loop output, solving the torque and current ripple problems caused by the direct input of the redundant electric propulsion system when the aircraft switches from a single-redundant cruise state to a dual-redundant high-speed state. Finally, the design method was simulated and validated using MATLAB/SIMULINK, verifying the feasibility of the design.
Design of electrical cabinet wire cutting machine based on STM32
Authors: Chen Hao , Liu Hongxi , Mu Xiaofei , Wang Chaoyong 
Published: July 2024

Abstract
The wire in the electric cabinet is one of the keys to ensuring the normal operation of the electric cabinet. In order to improve the production efficiency of wire cutting, this project designed a wire-cutting machine for an electrical cabinet, which could recognize the CSV table file of the electrical cabinet wiring list on a U disk and cut wires of different lengths and quantities according to the order in the file. The main control chip of the device uses STM32 single chip microcomputer (STM32F103C8T6) and CH376S module to realize the function of reading CSV file on U disk through serial communication. In terms of control, the device adopts a proportional-integral-differential (PID) control algorithm to achieve accurate control of the JGB37-520 gear motor and TD-8120MG steering gear and then realizes wire feeding, wire stripping, cutting, and other functions. The experimental results show that the average relative error of length is about 0.5%, and the error is within a reasonable range.
Research on load-resistant enhancement control optimization of composite energy power supply system based on deep reinforcement learning
Authors: Cheng Cheng , Li Huanhuan , Wang Fang , Li Yaoheng , Duan Sanxing 
Published: July 2024

Abstract
To solve the problem of insufficient inertia in the power electronics components under the development trend of power electronics in the transmission system of heavy-duty electric vehicles, combined with the composite energy power supply mode and control method, voltage-based feedback channels and virtual capacitor branches are designed for both engine-generator sets and DCDC control loops. These innovations compensate for system inertia and introduce a TD3 deep reinforcement learning-based adaptive regulation component to manage electrical systems in response to DC voltage fluctuations. This approach enhances the stability of the entire system in the face of load disturbances. Strategy validations demonstrate that this method ensures stable system operation, significantly mitigates DC voltage fluctuations during sudden load changes and is highly adaptable without relying on system models.
The calculation of rail potential considering stray current
Authors: Yan Jie , Bai Enming , Xu Jianyuan 
Published: July 2024

Abstract
Taking the railway network of a certain region as an example, this paper introduces the traction law of the metro in urban rail transit and the common power supply mode between traction stations. The finite element modelling of vehicle operating conditions was carried out using simulation software to analyze the interference law of stray currents of city rail on soil potential and rail potential at different times under unilateral and bilateral power supply modes. The results show that the influence of different working conditions is different, and the two-sided power supply mode can restrain the influence of stray current compared with the single-sided power supply mode.
Strain clamp condition monitoring for transmission lines based on acoustic emission signals
Authors: Zhang Guoqiang , Zhu Kuanjun , Li Mengxuan , Liu Yi , Ji Kunpeng 
Published: July 2024

Abstract
To ensure the reliability and safety of the power supply in the electric system, it is significant to realize the strain clamp condition monitoring for transmission lines. A strain clamp vibration test rig was designed and built to collect acoustic emission (AE) signals generated by strain clamps with an excitation frequency of 30, 50, 70, 90, and 110 Hz, respectively. The characteristics of the collected AE signals are then analyzed in the time domain and time-frequency domain. The results of the signal analysis in the time domain show that, the increasing excitation frequency leads to a higher amplitude of the AE signal, and the signal period is consistent with that of the excitation. Meanwhile, both the root-mean-square (RMS) and the average signal level (ASL) of the AE signal increase continuously with the excitation frequency, of which the growth trends are different. Additionally, the results of the signal analysis in the time-frequency domain also show that the signal spectrum is mainly concentrated in the range of 30 kHz to 200 kHz at different excitation frequencies and the increasing excitation frequency significantly leads to more high-frequency components in the AE signal.
Adaptive VSG-Based power allocation strategy for hybrid energy storage
Authors: Li Zihan , Fu Liyou 
Published: July 2024

Abstract
Aiming at the stochasticity of photovoltaic output and the problem of power, voltage, and frequency fluctuation caused by the lack of system inertia and damping parameters, a photovoltaic storage microgrid is constructed as a research object. Firstly, a virtual synchronous motor VSG is used to control the grid-connected inverter and to improve the dynamic performance of the system further. The inertia and damping parameters of the VSG are adjusted adaptively. Secondly, the hybrid energy storage device composed of a supercapacitor and battery adopts a second-order filter to avoid the integrating effect of the first-order filter on the high-frequency power and improve the poor performance of the first-order filter at the cutoff frequency to improve the accuracy of power distribution. Moreover, two negative feedback links of power error are added in the power distribution link to correct the reference power of the energy storage device, which further improves the power tracking effect of the energy storage system. Finally, the effectiveness of the above strategy is verified by a Matlab simulation session.
Trajectory optimization for the diving segment of air-breathing supersonic vehicle with multi-objective
Authors: Yan Suyu , Ming Chao , Wei Zhihua , Yang Kaiyuan 
Published: July 2024

Abstract
Aiming at the trajectory optimization problem of the dive section of the supersonic vehicle under the comprehensive action of different objective functions, a trajectory optimization design method for multi-optimization objectives of air-breathing supersonic vehicles is proposed. The hp adaptive pseudo-spectrum method is used to optimize the dive trajectory of an air-breathing supersonic vehicle with the maximum flight range and maximum landing velocity under the conditions of process constraints such as overload and dynamic pressure by the weighted summation method. It is proved that this method can solve the comprehensive optimization problem of multiple optimization objectives effectively and provides a new thought for the optimization of related fields.
Software architecture and implementation based on multi-core digital signal processors
Authors: Yuan Ningze , Meng Hao 
Published: July 2024

Abstract
Embedded detection systems are a critical research topic in intelligent monitoring equipment. In response to the current challenges in balancing real-time performance, accuracy, and stability in embedded hardware detection systems, this paper proposes a software architecture system based on multi-core digital signal processing (DSP), incorporating the image detection Canny algorithm into this system. Initially, the paper discusses the selection criteria for multi-core DSPs and then introduces a multi-core self-check function that can effectively ensure system stability. It also proposes a multi-core communication handshake protocol that significantly enhances the system’s real-time performance. Furthermore, an improved multi-core master-slave architecture is presented, which includes the addition of a timer to the conventional architecture, providing a temporal guarantee for system operation. Finally, the Canny algorithm is selected and applied to this software architecture, with parallel acceleration processing applied to parts of the algorithm. Operational tests have demonstrated that the system maintains stable internal data flow, with its detection accuracy and speed meeting the set requirements.
Enhancing YOLOv5 for superior PCB defect detection: lightweight heads and small target precision
Authors: Shi Yucong , Huang Junqi 
Published: July 2024

Abstract
This paper introduces an improved YOLOv5 network designed to achieve enhanced performance in the field of printed circuit board (PCB) defect detection. We incorporate a lightweight detection head, reducing the number of network parameters and improving computational efficiency. This not only facilitates operation in resource-constrained environments but also maintains detection accuracy. To better address the specific requirements of PCB defect detection, we introduce a small target detection head. By adding a detection head specifically designed for small targets, we enhance the network’s ability to perceive subtle defects, thereby improving detection accuracy. Finally, we validate our proposed improvements through experiments on a large-scale PCB defect dataset. Compared to the traditional YOLOv5 network, our model exhibits significant improvements in both accuracy and efficiency.
Motor test data quality evaluation model based on critic-fluctuant weight assignment method
Authors: Hu Xiaomei , Teng Xianshu , Hua Yuting , Weng Jiahong 
Published: July 2024

Abstract
The article addresses the limitations of traditional weight analysis methods in handling ground ignition experiment data for solid rocket motors, particularly the anti-interference ability to noise factors. To address this issue, the specialized Critic-Fluctuant weight analysis method is proposed. This method calculates objective weight values based on fluctuation values and integrates noise standard scores into data quality assessment, enabling researchers to effectively and intuitively identify different levels of data quality. After comparing and analyzing the objective weights and data quality scores of 100 ground ignition test data sets, it is verified that Critic-Fluctuant has higher adaptability and accuracy than traditional CRITIC methods in ground ignition test scenarios. The article provides new insights and tools for researchers to deal with similar data characteristics.