bluuebunny/crossref_metadata_2025 huggingface dataset:
3D Printed Nature Pattern Metastructure for The Sound Absorption Coefficient
Authors: Wahid Zaliha , Faizal Mat Tahir Mohd , Hadi Hendri Dwisatrya Lutfil , Kamaliana Khamis Nor , Arif Fadli Ahmad Muhamad , Zaki Nuawi Mohd
Published: March 2024

This research investigates the influence of the shape of 3D printed metastructures on sound absorption performance, focusing on three distinct configurations inspired by nature: honeycomb, spiderweb, and gyroid. The objectives involve designing and producing sound-absorbing structures using the 3D printing Fused Deposition Modelling (FDM) method. Simultaneously, the study analyzes and compares their sound absorption performance by considering the sound absorption coefficient and the noise reduction coefficient (NRC) for each pore shape. Using computer-aided software, the three different pore shapes were designed and produced using Polylactic Acid (PLA) material through FDM 3D printing. Each design was replicated at three different thicknesses: 10mm, 20mm, and 30mm, all with a diameter of 94mm. The sound absorption coefficient of the samples was evaluated through impedance tube experiments, collecting data for alpha (α) from 250 Hz to 2000 Hz. Subsequently, NRC values were calculated for four different frequencies: 250Hz, 500Hz, 1000Hz, and 2000Hz, ensuring a comprehensive analysis. Results indicate that the gyroid structure exhibited the highest overall sound absorption coefficient across the tested frequency range, followed by the spider-web and honeycomb structures. Additionally, the 30mm thickness demonstrated greater sound-absorbing performance than the 20mm and 10mm thicknesses. These outcomes provide valuable insights into the sound absorption capabilities of 3D printed metastructures, highlighting the superior performance of the gyroid structure. Understanding the impact of pore shape and thickness on sound absorption performance contributes to the development of acoustically optimized materials for various applications
A Conceptual Framework for Immersive Acoustic Auralisation: Investigating the Key Attributes
Authors: Khairul Anuar F N , Sulaiman R , Che Din N , Abdul Razak A S
Published: March 2024

In architectural acoustics, the assessment of sound propagation in interior and/or environmental conditions has now become progressively more prominent throughout the past few decades, as a response to the development of advanced prediction tools. Within the adaptation of virtual reality (VR) systems, it is necessary to considerably expedite the prediction and simulation software as well as to enable flexible and responsive data analysis during simulation and 3D audio sensory projection. To generate ideal immersion in a simulated virtual environment, the generated stimulus across all senses should therefore be coherent. Accordingly, in the domain of acoustic in virtual reality, the system sound simulation must be constructed efficiently in order to convey the auditory stimuli to the user in an appropriate manner. This necessitates the implementation of virtual reality system as an advanced prediction tool that can accurately anticipate and replicate realistic audio experiences. Therefore, this study explores the realm of acoustic virtual reality (AVR) through a critical review with the purpose of elucidating design attributes and determining factors in generating immersive acoustic VR experiences. In light of these findings, the aim of this paper is to develop a comprehensive conceptual framework that will serve as a beneficial guide and road map for future researchers and developers in the field.
Integration of Skyhook Control in a Quarter Car with Magnetorheological (MR) Damper
Authors: As’arry A , Idrus M. F. , Zhang K. L. , Rezali K. A. M. , Hassan M. N.
Published: March 2024

Semi-active suspension (SAS) systems attenuate vibrations with minimal power Consumption and is usually paired with magnetorheological (MR) dampers which are a type of variable damper that produces high damping forces with no mechanical movement. This paper presents the analysis of a Skyhook controller in a quarter car test rig equipped with MR damper to reduce vibration peaks when excited by a sinusoidal signal which simulates the unevenness of road surfaces. The viability of Skyhook control in mitigating vibration was examined from the experiments. The study discovered that there was an improvement of 12.72% by Skyhook control when compared to passive damping based on the sprung mass acceleration of both damping modes. The Skyhook controller surpassed passive damping and was deemed a success in vibration control.
Chatter Identification of Vibration Signals and Surface Roughness using Wavelet Transform and I-kazTM Methods
Authors: Samin R , Nuawi M Z , Ariffin MF , Rahim SA , Haris S M , Ghani J A
Published: March 2024

The paper describes the method to identify chatter in low-cutting-speed operations. It is based on vibration and surface roughness measurements. Tool chatter is the self-excited relative motion between the cutting tool and work piece. Tool chatter leads to poor surface quality and tool wear. The LMS Scadas testing system and accelerometer were used to measure the vibration signals during the turning operation, and Marsuft Psi was used to measure the surface roughness. When various cutting parameter combinations, such as cutting speed, feed rate, and depth of cut, were employed throughout the machining process, chatter and vibrating phenomena occurred. After the recorded signals were analyzed using the wavelet transform (WT), a chatter index (CI) was produced to determine how severe the chatter was. According to the results analysis, the experimental study demonstrated the close relationship between the surface roughness values and the chatter index when evaluating chatter identification.
Impact of Hybrid Plasmonic and Temperature in Random Laser Tuning
Authors: Aziz Gohar , Hayat Anwer , Iqbal Naeem , Zhai Tianrui
Published: March 2024

This research explores the interaction between silver films and dispersed silver nanowires (Ag NWs) in the context of generating random laser emission. To achieve random lasing, we use a mixture of Rhoda mine B (RhB) dye and a polyvinyl alcohol (PVA) matrix as the gain medium. The combination of silver components plays a crucial role in trapping and controlling light. The surface characteristics of the film, including its roughness and the interplay between localized and extended surface plasmons significantly affect the performance of the random laser (RL). The laser’s threshold is closely linked to the thickness of the film, which is influenced by its surface roughness. Additionally, variations in film thickness lead to wavelength modulation, ranging from 597 nm to 606 nm, primarily due to the reabsorption of RhB. Moreover, this research demonstrates the intriguing capability to tune emission wavelengths in response to temperature changes, promising precise wavelength control for plasmonic devices and potential applications.
Function optimization of ceramic firing process and reduction of energy consumption based on CFD simulation
Authors: Han Guangda , Zheng Naizhang , Wu Junming
Published: March 2024

Microwave sintering, as an efficient and energy-saving advanced sintering method, has advantages that traditional sintering methods cannot match, such as promoting ion diffusion and refining grains. This paper uses microwave heating equipment and solid-phase reaction method combined with microwave sintering technology to prepare ceramics. The treatment process of powders and the influence of microwave sintering parameters on the reduction of energy consumption in the ceramic firing process were studied, and the microwave sintering process was optimized. This article also uses computational fluid dynamics (CFD) as a tool to establish a numerical model of hydrodynamic sedimentation based on the Euler multiphase flow model, and it uses the established numerical model to conduct engineering scale research on the classification treatment process of processing waste. Finally, this article elaborates on the process of multi-process planning and optimizes relevant process parameters. This article builds on previous research by employing a BP neural network (BPNN) to determine the correlations between the many variables involved in the production of functional ceramics and their respective quality metrics. The experimental findings demonstrate the efficacy of the proposed methodology in performing intelligent tasks like process decision-making and optimizing process parameters.
Flow-induced Vibration of Two Tandem Oscillating Square Cylinders in Reattachment Regime
Authors: Wang Jun , Mahbub Alam Md. , Chen Qing , Lin Yiwen
Published: March 2024

To improve our understanding of structural stability, two vibrating tandem square cylinders is numerically investigated in the present study. In reattachment regime (L* = 2), mass ratios (m* = 3), Reynolds numbers (Re = 100) are considered. Different branches are identified. For the first cylinder, the maximum A* is about 0.10, which is one-third of a single cylinder. For the second cylinder, the maximum A* is about 0.42, which is 1.45 times of a single cylinder. Wake mode is observed, and the existence of the second cylinder restrains the vortex shedding from the first cylinder.
Mechanical performance analysis of prestressed socket assembled concrete frame structure relying on computer simulation analysis
Authors: Wang Fei
Published: March 2024

In order to improve the mechanical performance analysis of assembled concrete frame structure, this paper combines with computer simulation technology to analyze the mechanical performance of concrete frame structure, and uses the concrete damage plastic constitutive model provided by ABAQUS to define the nonlinear constitutive behavior of concrete. Based on the elastic-plastic model, the damage variables are added to the model, which can better reflect the performance of concrete under cyclic loading, such as stiffness degradation. In addition, this paper uses ABAQUS finite element analysis software to further analyze the structural parameters of this form of joints, and design related prestressed socket assembled concrete frame to study the seismic performance of prestressed socket assembled frame structure. Finally, the effectiveness of this model is verified by computer simulation.
Finite-time stability for impulsive stochastic nonlinear system with uncertain parameter
Authors: Wang Jun , Yao Fengqi
Published: March 2024

This paper considered the finite-time mean square stability for impulsive stochastic nonlinear system(ISNS) with uncertain parameter. By selecting the modal dependent Lyapunov functional, using average impulsive interval approach and combining Linear Matrix Inequality (LMI) method, the correlation stability criterion of ISNS was obtained. A gain matrix of the feedback controller is obtained on the basis of this sufficient condition. Finally, the LMI toolbox in Matlab was used for data simulation, and the relevant state trajectory demonstrates the availability of the proposed theory.
External defect detection technology and application status of transmission and transformation equipment based on video images
Authors: Hao Xiaolong , Lv Jin , Liu Dahui , Li Jinming , Cheng Xiangbin , Cao Cen
Published: March 2024

Power transmission and distribution equipment plays a critical role in supplying electricity to consumers. However, these assets are susceptible to external defects, such as corrosion, mechanical damage, and wear, which can lead to failures and disruptions in the electrical grid. Traditional inspection methods for detecting these defects often rely on manual inspections, which are time-consuming, costly, and subjective. To overcome these limitations, this paper explores the current state of video image-based external defect detection techniques for power transmission and distribution equipment. This makes up for the deficiencies of conventional approaches to inspecting and maintaining power transmission and transformation equipment by decreasing the waste of human resources and increasing the frequency and efficiency of intelligent operation and maintenance of power systems. This work investigates a completely convolutional block detection-based defect identification method to address the issue of defect recognition. The fully convolutional neural network is enhanced with the concept of block detection thanks to this approach. The local discrimination mechanism may be realized, and the drawbacks of the conventional block detection receptive field are avoided in the process. This approach offers improved generalization and fault identification over the original ResNet image classification system.
Effect of calcium content on the performance of CPVC cable protective tube
Authors: Ye Fang , Yu Jinshan , Sun Cheng , Wang Wei , Han Yongdian , Chen Qiang
Published: March 2024

The influence mechanism of different calcium content on the mechanical properties of cable protection pipe was studied, and the feasibility of feedback verification on the using performance of cable protection pipe through neural network learning method was also studied. Methods Shore hardness tester, universal electronic testing machine and densitometer were used to test the performance of cable protection tubes with different calcium content, and the quantitative relationship curve between cable protection tubes and performance was obtained. The database of hardness, density and composition was established through BP neural network, and the feasibility of feedback quality prediction was verified through test data. Results The hardness and density of the cable protective tube can be effectively improved by increasing the calcium element in the cable protective tube. Through the feedback prediction of performance by BP neural network, its qualification rate can be accurately predicted. Through this study, the content of calcium element can be adjusted appropriately according to the use conditions to make its performance meet the use conditions. Through Shore hardness tester and spectrometer, the quality of cable protection tube can be determined, and the nondestructive testing effect can be achieved.
Research on the Performance of Sound Absorption Materials for Substations in Power Grid
Authors: Wang He , Li Jintao , Sun Tong , Tian Yi
Published: March 2024

As the environmental protection policies become increasingly strict, higher requirements will be proposed for low-frequency noise control problems, and research on control strategies for low-frequency noise in substations is imperative. In this work, principles of resistive acoustic absorption and resonance acoustic absorption materials were analyzed. Based on the measurement in acoustic impedance tubes, the sound absorption performances of two typical sound absorption materials, the glass wool and the micro-perforated panel, were tested. This study offers a new reference for power grid companies to select and combines suitable acoustic materials to realize the optimal application in substations based on noise reduction requirements of different frequencies.
Research on Passive Location Strategy of UAV
Authors: Lu Yiming
Published: March 2024

Aiming at the problem of how to reasonably correct the position of UAV formation, we take the circular formation composed of 10 UAVs and the conical formation composed of 15 UAVs in the same plane as examples to study how to adjust the number and angle of UAV signal transmission so that the UAVs in the entire formation are in the designated position. This paper uses geometric model, greedy strategy and other methods, uses python, matlab and other software to obtain a reasonable and effective mathematical model, and makes a test and evaluation. The research results show that no matter circular, conical or other graphics, we can construct a triangle by connecting the transmitting signal and the receiving signal UAV, and solve the problem to obtain the best transmitting signal angle and the minimum number of sorties required; If there is no triangle between the UAV transmitting the signal and each UAV receiving the signal, the UAV receiving the signal will not reach the designated position. Nowadays, the use of UAVs is more and more extensive. The cooperation of multiple UAVs can complete many functions such as detection and performance, which is also the significance of our research on how UAVs can better receive signals.
Analysis on Mechanism and Characteristic of Vibration Fault on New Large Capacity Synchronous Condenser
Authors: Li Chenlong , Gu Wen , Xia Chao , Li Hewen , He Fengjun
Published: March 2024

Vibration faults are the most common faults in large capacity synchronous condenser. The article proposes 11 common vibration faults of condenser, including imbalance, misalignment, looseness, resonance, oil film oscillation, steam flow excitation, dynamic static friction, rotational stall, gear fault, rolling bearing fault, and other vibration faults. The article also proposes the mechanism, characteristics and case analysis of each type of fault separately. The research results on the mechanisms and characteristics of these faults are the foundation of condenser fault diagnosis, and are crucial for the development of intelligent decision-making systems and platforms. Which can provide the strongest technical support for improving power transmission and safety and stability of the power grid.
An Active Injected Location Method for DC Fault of Wind Power Based on Parallel Energy Absorption Module
Authors: Wo Renfei , Mei Jun , Diao Weiye , Guo Jiawei , Wang Guanghua
Published: March 2024

In recent years, the widespread adoption of wind power has been facilitated by the rapid advancements in new energy generation technology. The precise identification and efficient management of DC faults in onshore wind farms has gained increasing significance. To address issues such as limited functionality, low device utilization, and the inefficient use of fault energy prevalent in current fault location methods applied in wind power flexible grid-connected systems, this study explores the storage and reuse technology of fault energy. The article proposes a topology structure designed to absorb and reuse fault energy under multiple DC faults, aiming to overcome the challenges posed by single-function methods. The structure and control strategy of this topology are clearly delineated, and the design methodology for topology electrical parameters is thoroughly investigated. Simulation studies were conducted to validate the electrical characteristics of the employed devices and assess the operational effectiveness of the proposed topology within wind power grid-connected systems. In comparison with conventional fault location methods, the proposed scheme exhibits multiple energy absorption functions for DC faults and fault location capabilities, especially in the presence of permanent DC faults. As a result, this approach maximizes the utilization of DC fault energy, ensuring higher device efficiency and a broader spectrum of functionalities.
Forming Technology of a High-Frequency Conical Spiral Antenna
Authors: Zhu Lina , Luo Yiwu , Chen Lei , Wang Nan
Published: March 2024

This paper introduces the integrated stereo forming technology of high-frequency conical spiral antenna, focusing on the material selection and processing of the supporting substrate, the surface metallization technology of the substrate, the establishment of spiral CNC machining models, and the control of CNC machining difficulties. The technology has been successfully applied in engineering, ensuring the continuity and consistency of three-dimensional microstrip in space. It also resolves the offset address problems of docking ends and ports asymmetry caused by microstrip splicing technology. The advantages of this technology include high processing accuracy, good consistency, high stability, and short processing cycle. The high-frequency conical spiral antenna produced has been verified by antenna testing, adaptability tests of mechanical environment and temperature environment, and its performance is stable, which can meet the requirement of the design and application. It has been successfully applied to electronic countermeasures equipment. The test results indicate that the high-frequency conical spiral antenna has good electrical performance and consistency. So the integrated stereo forming technology for high-frequency conical spiral antenna is feasible and reliable. This provides a useful reference for the research on the similar products processability.
Analysis of Wire Breakage Fault Caused by Galloping on 66kV Debao A and B Line in November 2023
Authors: Xu Linfei , Zhao Bin , Zhang Sihang , Yang Zhi
Published: March 2024

In early November 2023, affected by extreme weather conditions such as rain, snow, and freezing, some transmission lines in northeast region experienced icing and galloping, which brought lots of tripping and disconnection faults. Taking the wire breakage faults of the 66kV Debao A and B line as examples, the causes, processes, and characteristics were all detailed analysed. It can be basically identified that after the first-order galloping of icing the wire, due to the lack of or limited effectiveness of anti-galloping measures, interphase flashover occurred. The flashover melted some of the stranded of galloping wire, resulting in dynamic tension caused by galloping concentrated towards the broken position, the remaining cross-section of the stranded. Due to repeated bending and stretching, the remaining stranded wires exceeded the limit of fracture stress, leading to fracture and overall wire breakage and landing. So the wire breakage fault in this case is strongly related to the interphase flashover caused by galloping. This article conducted fault analysis work by collecting line design, on-site meteorological conditions, and fault characteristics, providing technical support for subsequent prevention and control work.
Diagnosis and Treatment of Oil Film Whirl Fault in the Bearing of Large Synchronous Condenser
Authors: Xia Chao , Jiang Chen , Yu Dahai , Liu Yanan , Sun Chuan
Published: March 2024

The oil film vortex of a synchronous condenser rotor can cause an increase in bearing vibration. When the vibration amplitude exceeds the threshold value, it can cause the condenser to trip. The oil film vortex is related to many factors and often occurs during the start-up and acceleration process of the unit, as well as during the loading process of the unit. This article elaborates on the low-frequency oscillation accident of the bearing system caused by the oil film vortex fault of the rotor of a large synchronous condenser and its handling methods. This article presents a sudden low-frequency vibration of a large synchronous condenser. Based on the data collected on site and experimental test results, this condenser analyzes and diagnoses the low-frequency vibration incident, and ultimately determines it as an oil film vortex fault in the bearing system. The article combines the operation and maintenance plan of the synchronous condenser and conducts on-site dynamic balance tests on the synchronous condenser. After the dynamic balance test, the low-frequency vibration of the bearing system disappears and the fault is eliminated.
A Blocking Method for Bus Protection of CT Disconnection and Opening Method of HIF Based on Current Characteristics
Authors: Fang Yudong , Wang Zhijie , Chen Zhenyang , Li Yanjun , Feng Chuan , Yuan Jiawei , Jiao Zaibin
Published: March 2024

Current transformer (CT) disconnection in busbar can lead to erroneous operation of busbar differential protection. The existing methods for handling CT disconnection have not taken into account how to re-enable the protection in the case of high-impedance faults (HIFs). If the two types of faults cannot be distinguished in a timely manner, it can adversely affect the safe operation of the power grid. This paper provides a theoretical analysis of the differences between differential current and restraining current in the case of busbar CT disconnection faults and HIFs. Based on these characteristics, this paper proposes a criterion for CT disconnection fault blocking and a criterion for HIFs opening. Simulation results demonstrate that this method can effectively and accurately identify HIFs even in the presence of CT disconnection faults.
Design and Implementation of Intelligent Water Heater Based on STC89C52
Authors: He Ying
Published: March 2024

Smart home appliances have penetrated into every household, and the water heater industry is undergoing new changes. At this time, it is urgent to develop an automatic thermostatic system to ensure that the water temperature remains stable. Intelligent water heater using the STC89C52 can automatically adjust the water temperature, and the system control is achieved through the keyboard. The system can set the temperature accurately to 0.1°C and display the temperature value on the display screen. When the temperature set by the system is higher than the actual temperature, the single chip microcomputer controls the relay to power on and heat it up. When the collected water temperature is higher than the set temperature, the relay will turn off, stopping the heating of the water in the water tank. After experimental verification, it is proved that the system has sufficient stability and reliability, with the advantages of convenience, safety, and small size.
Controller Design of a Novel Interleaved Parallel Bi-Directional DC-DC Converter
Authors: Ouyang Jiayu , Wu Jun , Lin Meijin
Published: March 2024

To improve the dynamic performance of the output voltage of the new interleaved shunt bi-directional DC-DC converter, a double closed-loop control method of voltage and current based on fuzzy PI control is proposed. Firstly, based on the study of the operating principle and steady-state performance of the new interleaved parallel DC-DC converter, a small-signal mathematical model of the interleaved parallel bidirectional DC-DC converter with different modes is established, and based on the model, the transfer functions from duty cycle to output voltage and inductor current are derived, and accordingly, the double-closed-loop controller of the bidirectional DC-DC converter is designed. Then the design method of the fuzzy PI controller is described in detail, and the fuzzy control is applied to the voltage outer loop of the double closed-loop control so that the system can adjust the PI parameters in real time. Simulation experiments are carried out by Matlab/Simulink to compare the simulation experimental waveforms using fuzzy PI control and conventional PI control, and it is verified that the fuzzy PI control improves the output voltage response speed of the new interleaved shunt bi-directional DC-DC converter, reduces the voltage peak of the system, and reduces the overshoot.
Design and Optimization of a Highly Linear Power Amplifier with Novel Active Bias Circuit in InGaP/GaAs HBT MMIC Technology
Authors: Zheng Bangjie , Cheng Zhiqun , Le Chao , Gong Tingwei , Qian Tianle , Zhang Zhiwei
Published: March 2024

This paper introduces a highly linear power amplifier (PA) that utilizes a 2-μm InGaP/GaAs hetero-junction bipolar transistor (HBT) process. As communication systems evolve in complexity, the demands for the linearity and static power consumption of HBT power amplifiers are becoming more stringent. Typically, there exists a trade-off relationship between linearity and static power consumption in the design process. Hence, this paper proposes a novel active bias circuit for HBT power amplifiers, along with its layout design. The proposed active bias circuit consists of a differential pair and a current mirror structure, designed to enhance PA linearity while maintaining low quiescent current. Additionally, a novel layout structure is implemented to achieve thermal coupling between the RF transistors and the active bias, further improving PA linearity. As a result of the implementation of the proposed active bias and layout structure, the PA demonstrates high linearity in both amplitude modulation to phase modulation (AM/PM) and amplitude modulation to amplitude modulation (AM/AM) performance, while simultaneously maintaining a low quiescent current. The three-stage PA prototype achieves notable performance metrics, including a peak gain of 32.6 dB at 5.6 GHz, gain flatness of ±0.5 dB from 5.15 GHz to 5.85 GHz, and P1dB
of 32.1 dBm at a quiescent emitter current of 180 mA.
Application of Module Level Power Electronics Technology in Distributed Photovoltaic Power Generation System
Authors: Xu Libo , Ye Jun , Chen Yexin , Xu Hejun
Published: March 2024

Distributed photovoltaic power generation system usually adopts series wiring scheme, which has problems such as high voltage DC electrical safety risk, power mismatch of modules and maintenance management difficulty. Three schemes of module level power electronics technology are proposed, including string inverter with rapid shutdown device, string inverter with module optimizer and micro inverter. The electrical shut-off, power generation data monitoring, power optimization and inverter function characteristics of each scheme are described and compared, and the suggested application scenarios are given. In addition, typical electrical topology schemes of module level power electronic devices including rapid shutdown device, module optimizer and micro inverter are introduced.
Power Supply Status Analysis and Scheme Design of High Efficiency and Rapid Driving Equipment
Authors: Bu Pengsheng , Feng Gaohui
Published: March 2024

In the view of the problems of frequent movement and change in the practical application of complete sets of high efficient and rapid driving equipment, a scheme of extending the power supply distance is designed. In this scheme, an intelligent comprehensive regulation device is arranged in the shifting area and a power quality parameter monitoring device is arranged in the combination switch of the device. Real-time and accurate monitoring of the three-phase line voltage and phase Angle during the operation of the equipment and feedback to the intelligent integrated regulation device through optical fiber communication mode. The PLC controller in the intelligent integrated regulation device implements different voltage and phase regulation control strategies according to the voltage and phase Angle values monitored at the head and end. The test results in the plant show that the scheme can improve the terminal voltage of the equipment and achieve the purpose of “shift and change, long distance power supply.
Research on Miniaturization Design of Floor-standing Pole Electric Slewing Mechanism
Authors: Meng Fanhao , Xia Yongjun , Ma Yong , Liu Kai , Zhang Jinfeng
Published: March 2024

This study is dedicated to investigating the downsizing design and ensuring the structural robustness of pole-mounted slewing mechanisms, aligning with the dynamic requirements of the power industry. The research encompasses critical facets, including the intricacies of mechanical structure design, meticulous motor selection, and a thorough finite element analysis. The outcomes reveal a noteworthy safety factor of 2.08, surpassing the standard requirement of ≥ 2, albeit without factoring in stress concentration. This study underscores the paramount importance of downsizing design in meeting the evolving demands of the modern power industry. It offers invaluable insights into the structural integrity and stability of the mechanism, thereby ensuring its reliability and safety in practical applications. The implications of these findings are poised to catalyse significant technological advancements in the realm of pole-mounted electric slewing mechanisms.
The Test Study on Tension-torsion Coupling Effect of ACSR in Overhead Transmission Lines
Authors: Qi Zhiqiang , Zhang Cheng , Qiao Liang , Qin Jian , Wang Shunling
Published: March 2024

In order to analyze the relationship between the tensile and torsional characteristics of the Aluminum Conductor Steel Reinforced (ACSR), test research on the coupling effect of tension and torsion in conductors was carried out. A conductor tension-torsion coupling test device was designed, and selected the JL/G1A-630/45-45/7 ACSR as sample which is commonly used in ultra-high voltage AC engineering. The relationship between conductor tension, torque, and tensile strain, torsional strain was measured. And obtain the stiffness coefficients of conductor tension, torsion, and tension-torsion coupling. The testing results show that the tension and torque of the conductor gradually change from non-linear to linear under the action of tension or torsion deformation; The torsional stiffness Kφφ
and tension-torsion coupling stiffness Kεφ
when the conductor is turned to the right are greater than the corresponding stiffness when it is turned to the left.
Analysis on Transmission Characteristics of Dynamic Magnetic Coupling Mechanism of Racetrack Coil with Deflection Angles
Authors: Xie Kedi , Gao Quanfu , Zhang Xufeng , Shi Huirong
Published: March 2024

In dynamic magnetically coupled contactless power transmission, the fluctuation of mutual inductance is caused by the relative motion between transmission and receiving coils, which affects the stability of power transmission. In order to reduce the fluctuation characteristics of power transmission, the mutual inductance calculation model of transmission mechanism including a racetrack coil with deflection angle is established by using Neumann formula, and the influence of different deflection angle and layout on mutual inductance fluctuation characteristics is analyse and compare. Then the power transmission system with LCC-S compensation for the transmission mechanism is established. The transmission characteristics of the racetrack coil with deflection angle are studied. The results show that reasonable design of the deflection angle can reduce the fluctuation of the mutual inductance and the power output in dynamic transmission. The fluctuation of power output can also be reduced by changing the distance between transmission coils and the length of straight side of receiving coils.
Overall Scheme Design of Fault Diagnosis for Complex Electronic Systems
Authors: Mao Weiwei , Pang Teng , Jin Xiaoyu , Li Yang , Bai Hongbao
Published: March 2024

Traditional manual testing methods are no longer able to meet the maintenance needs of modern shipboard fire control system board-level circuits. Therefore, the development of intelligent and universal automatic test systems has become an important issue for shipboard fire control system fault detection. This article analyzes the performance and functional requirements of the automatic test system, develops the automatic test system based on PXI bus instruments, and designs an overall solution with signal time-frequency analysis capabilities that can carry out intelligent fault diagnosis for a variety of board-level circuits. On this basis, the design of hardware circuit and software solution is completed. The automatic test system was analyzed on hardware indicators and software functions. On the hardware side, the hardware resource selection was completed based on the hardware indicator requirements. On the software side, the overall software architecture design and the design of each functional module were completed based on the system software functional requirements. Finally, the composition and functions of each module of the system software and the overall operation process are introduced.
Research on Mine Wide Voltage Adaptive Power Supply
Authors: You Qingshan , Ran Xia
Published: March 2024

To solve the problem of multiple voltage levels and wide range of variations of underground power supply in domestic coal mines, this paper putting forward four wide power supply of adaptive design options with wide input voltage (AC 80-850 V), including phase shifted rectification based on fully controlled bridge, direct voltage adjustment based on AC power supply, voltage adjustment based on AC power supply rectification followed by chopping control, and a power supply voltage adjustment based on magnetic coupling transformer and thyristor automatic switching. After experimental comparison, the preferred scheme for automatic switching between magnetic coupling transformer and thyristors is preferred. The main circuit of this scheme adopts magnetic coupling transformer and thyristor control method, and the control circuit adopts a three way drive circuit based on MCU control, while adopting the strategy of instantaneous voltage tracking control. This scheme achieves stable operation of the output DC power supply voltage at 24V when the input AC power supply voltage varies from 80 to 850 V. The experimental results showed programme was stable and reliable, and it’s worth applying and has practical significance.
Calculation Method for Structural Dynamics of Material Ropeway under Startup and Shutdown Conditions with Single Concentrated Loads and Distributed Multiple Loads
Authors: Qin Jian , Liu Chen , He Ronghao , Zhu Lingfeng , Chen Wei , Chen Weiyu
Published: March 2024

In light of the unique structural features of material ropeway of transmission line, this paper presents a calculation method for the structural dynamics of material ropeway when subjected to single concentrated loads and distributed multiple loads. Taking into account the geometric nonlinearity and significant flexible deformation features of carrying rope and pulling rope in material ropeways, a finite mass point method is utilized for theoretical derivation to investigate the effects of varying load weights and speeds on tension fluctuations in carrying rope and pulling rope during the startup and shutdown processes. The results indicate that the proposed method can accurately calculate the tension and structural variations in carrying rope and pulling rope of multi-span material ropeway when subjected to single concentrated loads and distributed multiple loads. This method not only satisfies the requirements for transmission line engineering applications but also offers insights into the safe utilization of material ropeway of transmission line.
Intake Characteristics and Inhomogeneity of Supersonic Passage
Authors: Hu Yunbo
Published: March 2024

The type, quantity, location, geometry and size of the intake passage will directly affect the quality of the engine, and then affect the whole propulsion system and even the performance of the aircraft. In this paper, the intake characteristics and inhomogeneity of three different passage structures are studied under supersonic conditions. The numerical simulation models of the intake passages of F-16, F-18 and J-10 were established, and the steady-state calculations were carried out under the condition of Mach number 1.2. In the three intake passages, the total pressure decreases gradually along the flow direction, and the pressure loss near the wall is large, while the total pressure value far from the wall is large, and the pressure field is relatively uniform. The F-18 intake passage has relatively small inlet pressure and total inlet and outlet pressure loss. In terms of inlet uniformity, the intake passage of F-16 has the highest value, F-18 has lower value, and J-10 has the lowest level of inhomogeneity.
Investigation of Wear Properties and Corrosion Resistance of Electrodeposited Ni-P-PTFE Nanocomposite Coating on Mg-Li alloy
Authors: Shi Lei , Ma Jing , Zhang Zhonghui , Sun Chufeng
Published: March 2024

Ni-P-polytetrafluorethylene nanocomposite coatings based on Mg-Li alloy were successfully prepared by utilizing electrodeposition method. The nanocomposite coatings were investigated employing scanning electron microscopy, atomic force microscopy, and X-ray diffraction. The microstructure and composition of the coating were studied by friction, wear and corrosion tests. The experimental results reveal that when the concentration of PTFE is 3 g / L, deposition temperature is 70 °C, current density is 2 A/dm2, and pH of the plating solution is approximately 5.5, a uniform and dense Ni-P-PTFE nanocomposite coating is formed on Magnesium alloy substrate, and it exhibited a low coefficient of friction (∼1.5) and superior abrasion resistance. The co-deposition of PTFE particles can effectively reduce the friction coefficient and wear rate, and the wear mechanism is characteristic cutting wear. Under artificial seawater conditions, the experiments have demonstrated that the nanocomposite material possesses a corrosion current density of 3.9×10-5 A/cm2.
Electrodeposition of Magnesium in Deep Eutectic Solvents Based on Magnesium Chloride Hexahydrate and Choline Chloride with Urea Added
Authors: Chen Qing , Wang Qian , Lu Shenghua
Published: March 2024

Magnesium (Mg) alloy has small density, large elastic modulus, good heat dissipation and corrosion resistance to organic matter and alkali. At present, magnesium alloy is more and more used in automotive industry, medical devices and aerospace industry. However, the traditional preparation method of Mg has the disadvantages of high investment, high labor intensity and great environmental pollution. Therefore, it is of great significance to develop simple, environment-friendly methods of the magnesium. In this study, urea was added to adjust the electrochemical property of the deep eutectic solvent (DES) mixed by choline chloride (ChCl) and magnesium chloride hexahydrate (MgCl2·6H2O). Cyclic Voltammetry (CV) curves reveals that the addition of urea made the reduction potential of Mg shifted from -0.9 V to -1.3 V. Among the CV curves, one was proposed as the “dividing line”, which shows that the electroactive species in the two DESs, ChCl-MgCl2·6H2O and urea-MgCl2·6H2O, are different due to the changes of the component of the DESs. Fourier transform infrared (FTIR) data shows the type of hydrogen bond had been changed with the increase of urea content. Furthermore, the Raman spectra indicates that Mg2+ was coordinated with urea chains, which did not exist in ChCl-MgCl2·6H2O. Moreover, it was found that urea changed the electrochemical performance of the ChCl-Urea-MgCl2·6H2O by changing the hydrogen bond in the system and coordination form of the electroactive species, rather than adsorbing onto the electrode surface. Combined with geometry calculations at the B3LYP/6-311++G (d, p), the most probable mechanism of electrodeposition process was deduced.
Analysis and Optimization of Telescopic Drill Rod Structure Based on SolidWorks
Authors: Wu Fenqian , Chen Weiyu , Liu Ruijun , Gao Yiran , Zhang Yiqing
Published: March 2024

In this paper, the structural performance of the telescopic drill pipe structure is optimized and analyzed. The main working principle of the telescopic drill pipe is to drive the two internal telescopic rods through the two-stage telescopic cylinder, so that it can produce stable reasoning and motion characteristics. The 3D model of the telescopic drill pipe is also established by using SolidWorks software. The simulation of SolidWorks module is used to analyze the dynamic characteristics of the two-stage telescopic drill pipe, including the first five modal shapes, static stress and fatigue life of the structure. The distribution law of the maximum stress distribution point and the easily damaged position is found, and the structural design is optimized, which provides a reliable structural design scheme for improving the fatigue strength of the telescopic rod and prolonging the life cycle of the equipment.
First test results of the HGCAL concentrator ASICs: ECON-T and ECON-D
Authors: Braga Davide , Cummings Grace , Gingu Cristinel , Hirschauer James , Hoff James , Klabbers Pamela , Kharwadkar Neha , Mantilla-Suarez Cristina , Noonan Daniel , Rubinov Paul , Shenai Alpana , Syal Chinar , Wang Xiaoran , Wickwire Ralph , Bergamin Gianmario , Ceresa Davide , Kulis Szymon , Lupi Matteo , Scarfì Simone , Coko Duje , Hammer Mike , Wilson Jon , Bam Bhim , Babbar Jyoti , Campbell Alex , Miao Yulun , Feas Bram , Gong Datao , Guo Di , Yang Dongxu , Prinzie Jeffrey , Ye Jingbo , Leroux Paul Jozef , Moreira Paulo , Leitao Pedro , De Oliveira Rui ,   the CMS collaboration
Published: March 2024

With over 6 million channels, the High Granularity Calorimeter for the CMS HL-LHC upgrade presents a unique data transmission challenge. The ECON ASICs provide a critical stage of on-detector data compression and selection for the trigger path (ECON-T) and data acquisition path (ECON-D) of the HGCAL. The ASICs, fabricated in 65 nm CMOS, are radiation tolerant up to 200 Mrad and require low power consumption: < 2.5 mW/sensor-channel per chip. We report on the first functionality and radiation tests for the ECON-D-P1 full-functionality prototype. We present a comparison of single event effect (SEE) cross sections measured for different methods of triple modular redundancy using test results from the ECON-T-P1 full-functionality prototype.
Development of phytosterol-loaded silver nanoparticles for ameliorating haemorrhoidal complications via the AMPK pathway—a mechanistic approach
Authors: Dubey Tarkeshwar , Bhanukiran Kancharla , Hemalatha Siva
Published: March 2024

The aim of the current study was to synthesize silver nanoparticles (PLSNPs) using green technology by means of phytosterol-enriched fractions from Blumea lacera extracts (EAF) and evaluate their toxicological and anti-haemorrhoidal potential. The average size of the synthesized particles was found to be 85.64 nm by scanning electron microscopy and transmission electron microscopy. Energy dispersive spectroscopy showed the elemental composition of PLSNPs to be 12.59% carbon and 87.41% silver, indicating the capping of phytochemicals on the PLSNPs. The PLSNPs were also standardized for total phytosterol content using chemical methods and high-perfromance liquid chromatography. The PLSNPs were found to be safe up to 1000 mg kg−1 as no toxicity was observed in the acute and sub-acute toxicity studies performed as per OECD guidelines. After the induction of haemorrhoids, experimental animals were treated with different doses of EAF, PLSNPs and a standard drug (Pilex) for 7 d, and on the eighth day the ameliorative potential was assessed by evaluating the haemorrhoidal (inflammatory severity index, recto-anal coefficient) and biochemical (tumour necrosis factor-alpha and interleukin-6) parameters and histology of the recto-anal tissue. The results showed that treatment with PLSNPs and Pilex significantly (p < 0.05) reduced haemorrhoidal and biochemical parameters. This was further supported by restoration of altered antioxidant status. Further, a marked reduction in the inflammatory zones along with minimal dilated blood vessels was observed in the histopathological study. The results of molecular docking studies also confirmed the amelioration of haemorrhoids via AMP-activated protein kinase (AMPK)-mediated reduction of inflammation and endothelin B receptor modification by PLSNPs. In conclusion, PLSNPs could be a good alternative for the management of haemorrhoids.