bluuebunny/crossref_metadata_2025_split huggingface dataset:
Build-up dynamics of different pulse types in a dispersion-managed Yb-doped fibre laser
Authors: Wu Yunfeng , Gao Ziqi , Zhang ZeXin , Liu Haiyan , Tian Jinrong , Song Yanrong 
Published: August 2023

Abstract
We present a dispersion-managed mode-locked ytterbium fibre laser based on the nonlinear polarization evolution technique. Four single-pulse states could be generated by changing group delay dispersion values from anomalous (−0.0038 ps2) to normal (0.051 ps2) with a grating pair. In the normal dispersion regime, the pulse width was gradually decreased with the decrease of the net dispersion. In the anomalous dispersion region, the typical soliton was obtained, which time-bandwidth product could be calculated as 0.526. In addition, the dynamics of four states were also investigated by using the dispersive Fourier transformation technique. Different pulse evolution dynamics were observed from chaotic state to mode-locking.
Neural Network based Transmission Line Fault Classifier and Locator using Sequence Values
Authors: Idris Muhd Hafizi , Adzman Mohd Rafi 
Published: August 2023

Abstract
Faults can easily occur at transmission line because the line is exposed to the environment. The fast fault location after a fault occurrence will minimize the time to repair the faulty part thus reduce the stress of power system due to long outage time. This paper demonstrates the development of fault classifier and fault locator using neural network. The positive, negative and zero sequence values of three-phase voltage and current during fault time were used as the inputs to train the neural networks. Various fault conditions which have different fault types, fault resistance values and fault locations have been simulated to generate the training data for both neural network based fault classifier and fault locator. From the results, the fault classifier and locator successfully classified and located all the simulated fault conditions. One of the advantages of using sequence values as the inputs for the neural networks is only one fault type need to be simulated and used as the training data for single line-to-ground fault (RG, YG and BG), line-to-line fault (RY, YB, BR) and double line-to-ground fault (RYG, YBG, BRG).
Loss minimization in Quadratic Boost Converter Multilevel Inverter fed induction motor system by Tuning of FOPID controller using PSO
Authors: Umadevi D , Shivakumar E G 
Published: August 2023

Abstract
Particle swarm optimization algorithm (PSO) is suggested to discover fractional order PID (FOPID) controller optimal variables for a better performance of induction motor. This PSO algorithm is designed to handle multiple optimization issues, due to its ease of application. A Closed Loop Quadratic Boost Converter Multilevel Inverter Fed Induction Motor (QBCMLIIM) system is simulated to earn reduced switching losses and reduced THD by incorporating particle swarm optimization(PSO) tuned Fractional Order PID controller. PSO stands to be one of the popular Artificial Intelligence (AI) method. The PSO algorithm starts its process from the initial particles by allotting initial velocities to the particles. At each location the objective function and the corresponding best values are evaluated. The double loop feedback system enhances the performance and robustness by suppressing the oscillations and overshoots.
PCB Rogowski Coil sensor by using Saw blade pattern for arcing fault detection
Authors: Khalid K.A. , Fahmi M.I. , Nanyan A.N. , Bohari Z.H. 
Published: August 2023

Abstract
Rogowski is a special current transformer and has been categorised as a low-power stand-alone current sensor. This sensor is designed by using a Saw blade pattern with 50 turns and 100 turns. This number of turns will impact the increment of the sensitivity of the sensor. Rogowski coil is used for measuring the alternating current (AC) and high-speed current pulses. The PCB Rogowski Coil will detect the arcing fault that design with AutoCAD software after that import to CST software. An arc is created when the electrical current jumps the gap between two conductive materials. The most common causes of arcs include worn contacts in electrical equipment, damage to insulation, break in a cable and loose connections. In order to reduce the arc fault risk, the arc fault interrupter (AFI) technology and arc fault detectors (AFD) have been developed. However, these devices are most suitable for domestic application or low voltage (LV). This paper proposed a simulation using AutoCAD and CST software to design a Rogowski coil and the Rogowski Coil sensor will be tested by using CST software in terms of radiation pattern. The biggest radiation pattern in red colour is the saw blade pattern in 100 turns at 2 KHz frequency, the radiation pattern covering entire sensor area compared with other radiation patterns with other frequency. The main lobe magnitude for 2 KHz frequency is 46.8 dB, main lobe direction is 180 deg, angular width is 153.4 deg and the side lobe level is zero. This is the best number of turn and frequency compared to 50 turn saw blade sensor.
Explicit Solution of Parameter Estimate using Multiparametric Programming for Boost Converter
Authors: Mid E C , Mukhtar N M , Syed Yunus S H , Hadi D A , Ruslan E 
Published: August 2023

Abstract
This work proposes an approach to estimate the parameters of capacitance and inductance in a boost converter using an explicit solution. A multiparametric programming (MPP) algorithm is fundamental to the suggested methodology, which aims to develop parameters as explicit functions of measurements. In this method, the generalised mathematical model of the boost converter is discretised into an algebraic equation. The parameter estimation problem is then formulated and solved using Karush-Kuhn-Tucker. Finally, an explicit solution of estimate parameters such as capacitor and inductor is formulated as an explicit function of the inductor currents and capacitor voltage. Finally, the state variables of the boost converter are numerically obtained and used to test the capability of the proposed work. The results presented in this work prove the MPP algorithm can estimate the boost converter’s parameters, which can be extended to other power converters and filters.
Supercapacitor’s Parameter Calculation based on Three Branch Equivalent Circuit Model under Different Constant Charging Current
Authors: Jabbar M. Abdul , Fahmi M. I. , Yaakob SB , Liew H F , Khan MDSA 
Published: August 2023

Abstract
Supercapacitor is a type of energy storage with higher capacitance value compared to the normal capacitor. But it has lower voltage level compared to normal capacitor. However, it can be charged with high current and provide higher current to the load when needed when compared to the same size energy storage such as battery. The Three Branch Equivalent Circuit is one of the simple yet accurate model that has been proposed. The parameter of the Three Branch model included the capacitance, resistance and a unit of voltage dependent capacitance. The Parameter needed to be calculated accurately as it depends heavily on the terminal voltage of the supercapacitor at respective time which obtained through a charging and self-discharging experiment under constant current charging. The different constant charging current give effect toward the parameter calculation as it manipulates the rate of charging and self-discharging. This paper will calculate the parameter of supercapacitor based on the Three Branch model under different constant charging current and compared the result using the simulation to show the accuracy of the model. The parameter obtained throughout the study shows a high accuracy especially the parameters obtained using higher charging current.
Drone Detection using Ultrasonic Sensors for Passive Forward Scattering Radar System
Authors: Abdul Aziz N H , Mahadi M A A , Mohd Noh Z , Othman K A 
Published: August 2023

Abstract
Passive Forward Scattering Radar (PFSR) is a great system that can be used to identify ground moving targets, especially in unsafe areas for reason such as protection and security. Although PFSR can detect any moving target, there are some limitations as PFSR cannot measure height and detect small target such as a drone flying in the sky. A drone is a good device based on the latest technologies, therefore it can also be very dangerous as it can fly in the sky entering prohibited areas that can, for example, breach a border protection system. By developing a system using ultrasonic range sensor interfacing with Raspberry Pi (RPi) and also implementing Internet of Things (IoT) using mobile phone application, which is Telegram, as a security alarm system, this system can integrate with PFSR to be a better system. This project aims to improve the PFSR system with an ultrasonic range sensor remote measuring device. When set up next to the PFSR system, the ultrasonic range sensor has large distance measurement capabilities and use low power to operate. Since ultrasonic range sensors cannot work by themselves, the RPi was used as an operating host that helped to operate and collect data. Then, the data collected was saved into Comma Separated Values (CSV) files to be sent to Telegram mobile application later to the user as notification. The data collected from both systems were compared in order to relate that the ultrasonic range sensor system can indeed support the PFSR system. Since the result was obtained and analysis was done successfully, it can be concluded that the system can support the PFSR system, whereby as the drone height (cm) increased, the signal captured in time (sec) decreased. In addition, this system can contribute in many areas such as borders or streets, to detect speed of vehicles or as a traffic surveillance system and for some other reasons such as protection, security and research.
Cooling Pipe Network System in the Quenching Green Equipment Design Method Based on the “Solid Contact-Fluid Heat Transfer” Mode
Authors: Zhang Hongchen , Chen Peng , Bai Shuowei , Wang Qing , Ju Junwei , Wang Yuqi 
Published: August 2023

Abstract
As a typical thin plate part, a circular saw blade matrix is prone to deformation and cracking due to uneven surface cooling rate during heat treatment. Simultaneously, the traditional quenching method is easy to produce a low product qualification rate and serious environmental severe when processing thin plate parts. The quenching device designed in this paper is to achieve the non-contact quenching between the processed parts and the quenching medium through the heat transfer of the fluid in the cooling pipe. The structure design of the internal cooling channel will directly affect the temperature field distribution of the quenching device, thus determining the microstructure and final performance of the product. Therefore, based on the microstructure transformation mechanism and pipe network flow control theory, combined with the heat transfer theory and other relevant theoretical bases, this paper established the mathematical model of internal cooling system parameters. Finally, MATLAB is applied to solve the fluid network topology model. It provides a reliable and general research method for cooling pipe networks in quenching devices based on the “Solid Contact-Fluid Heat Transfer” Mode.
Influence of nozzle structure and process parameters for 3D printing HTPB-based propellant
Authors: Song Shixiong , Ren Quanbin , Shi Jiawei , Shi Hongbin 
Published: August 2023

Abstract
This paper studies the influence of nozzle structure and process parameters on the solid propellant 3D printing process, so as to better guide nozzle structure optimization and process improvement, and realize continuous extrusion and molding of solid propellant. Four characteristic parameters such as nozzle diameter, nozzle shrinkage angle, process temperature, and wall slip coefficient are selected, and the influence of these four parameters on the extrusion speed and pressure of solid propellant slurry in the nozzle is discussed by using the orthogonal test principle and ANSYS/POLYFLOW. The results show that the most significant factor affecting the outlet velocity uniformity index and outlet pressure is the wall slip coefficient, followed by the nozzle diameter, and the influence of temperature and contraction angle is small.
Mechanical Friction Simulation and Optimization Design of Floating Bearing of Mechanical Tricone Bit
Authors: Lei Ming , Peng Fang , Zhang Shiqiang , Zheng Junyuan , Wang Weihua , Ying Wu , Kong Xiangrui 
Published: August 2023

Abstract
This paper aims to find out the most vulnerable position and the suitable clearance ratio of the floating sleeve between the inside and outside floating sleeve of the tricone bit. In this paper, the mechanical analysis model of the drill bit is established to get the simulated working condition of the tri-cone bit, and then the stress condition of the floating bearing is simulated. Finally, the multi-factor variable orthogonal test method is used to optimize the clearance ratio of the floating sleeve. The results show that the simulation results are consistent with the wear position of the floating sleeve: during the operation of the floating sleeve, the most vulnerable position is the edge position, the largest deformation is the opening position, the recommended internal clearance of the floating sleeve is 0.06–0.07 mm, the recommended external clearance is 0.02–0.04 mm, and the recommended internal clearance ratio is 2.0–2.4.
Interference Assembly Stress of Wheel-Axle in B-type Subway
Authors: Tong Yao , Tian Chun 
Published: August 2023

Abstract
This paper aims to improve the reliability of train operation as well as to guarantee the safety of wheelset interference assembly. A finite element model of the wheel-axle interference fit is established with a metro B-type car as the research object. The finite element calculation software is used to simulate the static strength of the wheel-axle model under different working conditions, contact spots, and maximum/minimum interference. The effect of different interference and different working conditions on contact stress is studied. The study shows that the wheel meets the static strength requirements under all working conditions. The maximum equivalent stresses are located at the wheel hub bore under the maximum or minimum interference assembly. The full curved condition with maximum interference is the most dangerous condition among the working conditions.
The Model Reduction Method of Grouped Blades
Authors: Zheng Zhaoli , Zhao Zhenxing , Yang Xiaohu , Cao Guangming , Wu Jun 
Published: August 2023

Abstract
As an important structure in turbine machinery, grouped blades are easy to damage due to large thermal loads and centrifugal loads. Once the characteristic frequency of grouped blades is equal to or close to the frequency of the exciting forces, the vibration of the grouped blades will become very severe. Therefore, it is very important to analyze the characteristic frequency of grouped blades accurately and quickly. This article aims to investigate the model reduction method of grouped blades, which can reduce the unknowns in the dynamic equations of grouped blades. And the efficiency of the modal analysis of grouped blades can be improved. Finally, the effects of the modal truncation number on the error of the natural frequency, the modal shape confidence factor, and the calculation time are discussed. Although the structure discussed in this paper is the disk with three blades, the derived algorithm can be applied to large-scale grouped blades. The study of this paper can serve as a reference for the design and validation of the widely used blade groups in the industry.
Mining Machines for Comprehensive Mechanized Mining of Bauxite
Authors: Wang Zhenqian , Zhang Liqiang 
Published: August 2023

Abstract
The mining machine for bauxite is the key equipment for the mechanized mining of underground bauxite ore. The mining machines for shearing and loading bauxite ore have been studied in this paper from three aspects: the determination of key technical parameters, the in-situ tests, optimization, and improvement. Mechanical and physical parameters of bauxite ore, such as high tensile strength, no-cleavage, and abrasion properties, have a great impact on the determination of key technical parameters of the mining machine. The conventional conical picks which are widely used in mining equipment drums for soft rock, such as coal mines, are not suitable for bauxite and other high-abrasion ore rocks. The chisel pick is theoretically a better choice. The main faults of the mining machine for bauxite during the in-situ tests are closely related to the high abrasion of bauxite rock, especially for the abrasion of conical picks and the walking actuator of the traction part. So the second-generation mining machine should be optimized from the selection of types, linear speed, and cutting depth of picks, from selecting wear-resistance material for the walking actuator of the traction part and designing a more suitable structure for the walking actuator of the traction part. The research results have important theoretical significance for the design of mining machines for bauxite.
Electrostatic layer jamming variable stiffness based on AC waveform regulation
Authors: Wu Xiongxiong , Lu Ben , Liao Ningbin , Jia Wenchuan , Sun Yi 
Published: August 2023

Abstract
As a method to achieve variable stiffness of soft robots, electrostatic layer jamming (ELJ) has the disadvantages of low breakdown strength and a single stiffness control method. In this paper, we propose to replace the air of the traditional ELJ device with giant electrorheological fluid (GERF) and introduce the method of adjusting the stiffness by AC waveform to solve these problems. We perform friction experiments on ELJ devices (ELJ-GERF, ELJ-Air, ELJ-Oil) under three different dielectrics of GERF, air, and silicone oil. The results show that the breakdown probability of ELJ-Air increased significantly when the applied voltage is greater than 3000 V, while ELJ-GERF and ELJ-Oil can withstand voltage exceeding 5000 V. ELJ-GERF has higher breakdown strength than ELJ-Air. At the same time, the AC waveform can regulate the stiffness of the three devices. By applying voltages with three different AC waveforms (sine wave, square wave, and triangle wave), all three devices exhibit different stiffness properties. The stiffness of ELJ-GERF is increased by 2.6 times, 4.5 times, and 2.7 times under the sine wave, square wave, and triangular wave respectively compared with DC voltage. The other two devices also have a certain increase in stiffness.
The study of ionic conductivity of the Li10GeP2S12 type Solid State Electrolyte by an extrapolation method and a deep-learning method
Authors: Peng Jie , Du Jianwen , Wang Liping 
Published: August 2023

Abstract
An extrapolation method is usually applied when Ab initio molecular dynamics (AIMD) is applied to studying ionic conductivity in solid-state electrolytes in lithium-ion batteries. As the ions move slowly in solid-state electrolytes, the first-principles method typically involves computationally intensive calculations, and it can take significant time to obtain accurate results. First-principles method is too expensive for the time scale required at room temperature. The classical molecular dynamics method is typically applied to systems containing thousands of atoms and can simulate the system’s behavior over nanoseconds. During the simulation, the positions and velocities of the atoms are updated at discrete time intervals, allowing the system’s behavior to be studied over time. However, its accuracy depends on the empirical force-field libraries. Limited by the computational resource, the previous studies applied the extrapolation method to obtain the room temperature ionic conductivity, which was not accurate because the linear relationship in the Arrhenius equation was not valid in a wide range of temperatures. Deepmd-Kit is a tool that integrates these two different computational approaches. The extrapolation and Deepmd methods were applied to the materials Li10GeP2S12, Li10SiP2S12, Li10GePS12Cl, and Li10SiPS12Cl, respectively. Both methods showed that the lithium ions favor the c direction when diffusing in the LGPS-type solid-state electrolytes. The ionic conductivity is more accurate with the dependent method compared with experiments.
Optimised Design for High-speed Solenoid Valves with Dual Coils
Authors: Zhang Zichen 
Published: August 2023

Abstract
Aiming at the dynamic performance of the solenoid valve for the injection molding machine and the mutual constraint of coil heat generation in the process of energization, a control method of the solenoid valve for the injection molding machine with series start and parallel hold is proposed. A two-coil solenoid valve is designed, and a basic simulation model of the solenoid valve is built using COMSOL finite element simulation software, and numerical calculations are performed for the conventional solenoid valve for the injection molding machine and the two-coil solenoid valve, respectively. The results show that in the process of opening, holding, and closing the valve, the response speed of opening the valve is increased by 87.9%, the response speed of closing the valve is increased by 75%, and the coil heat generation is reduced by 14.3% during holding by reducing the height of the moving iron core during holding.
Experimental study on anti-loosening technology of transmission line bolts
Authors: Li Qinghua , Li Maohua , Wu Jing , Liu Yaduo , An Ping 
Published: August 2023

Abstract
Bolts are widely used in transmission lines and are key connecting parts of transmission lines. Transmission lines have been affected by the natural environment for a long time, and bolts are prone to frequent vibration leading to loosening or falling off. Bolt loosening endangers the safe and stable operation of transmission lines. This paper analyses the loosening mechanism of the transmission line screw connection, carries out the transverse vibration contrast test of the common bolt anti-loosening measures, and develops the integrated self-locking double nut for the hidden danger of the transmission line bolt loosening, which has good anti-loosening performance, convenient installation, and the conditions for engineering popularization and application.