bluuebunny/crossref_metadata_2025_split huggingface dataset:
Recent Research on Iridium‐Based Electrocatalysts for Acidic Oxygen Evolution Reaction from the Origin of Reaction Mechanism
Authors: Chen Ligang , Zhao Wei , Zhang Juntao , Liu Min , Jia Yin , Wang Ruzhi , Chai Maorong 
Published: June 2024

AbstractAs the anode reaction of proton exchange membrane water electrolysis (PEMWE), the acidic oxygen evolution reaction (OER) is one of the main obstacles to the practical application of PEMWE due to its sluggish four‐electron transfer process. The development of high‐performance acidic OER electrocatalysts has become the key to improving the reaction kinetics. To date, although various excellent acidic OER electrocatalysts have been widely researched, Ir‐based nanomaterials are still state‐of‐the‐art electrocatalysts. Hence, a comprehensive and in‐depth understanding of the reaction mechanism of Ir‐based electrocatalysts is crucial for the precise optimization of catalytic performance. In this review, the origin and nature of the conventional adsorbate evolution mechanism (AEM) and the derived volcanic relationship on Ir‐based electrocatalysts for acidic OER processes are summarized and some optimization strategies for Ir‐based electrocatalysts based on the AEM are introduced. To further investigate the development strategy of high‐performance Ir‐based electrocatalysts, several unconventional OER mechanisms including dual‐site mechanism and lattice oxygen mediated mechanism, and their applications are introduced in detail. Thereafter, the active species on Ir‐based electrocatalysts at acidic OER are summarized and classified into surface Ir species and O species. Finally, the future development direction and prospect of Ir‐based electrocatalysts for acidic OER are put forward.
Computer vision‐based automated defect detection in ceramic bricks
Authors: Kataev M. Y. , Bulysheva L. A. 
Published: June 2024

AbstractNowadays, the development of cost‐effective, data‐driven technological processes using telecommunication technologies is essential. One of the focuses is on automating the process of evaluating the manufactured goods' quality. Vision‐based technology is now becoming increasingly used for monitoring purposes. Despite its advancements, computer vision technology has practical limitations. These include the physical characteristics of the measuring process, features specific to the technological procedures, and constraints related to software and mathematical algorithms. Among the cutting‐edge approaches, optical methods combined with neural network algorithms (NN) stand out. This significance is particularly evident because numerous industries continue to depend on manual defect identification methods, which are labour intensive, slow, and subject to human subjectivity. The article introduces a novel approach based on computer vision methods. It outlines an automated optical inspection system designed to detect defects in bricks on a transport belt during the production process. The article presents the processing algorithms used and discusses the results obtained.
Effect of solid lubricant additives on solid particle erosion characteristics of rigid and toughened epoxy resins
Authors: Özzaim Toker Pelin , Korkusuz Orkan Baran , Ozun Elanur , Ceylan Reyhan , Fidan Sinan , Yarar Eser , Bora Mustafa Özgür , Sınmazçelik Tamer 
Published: June 2024

AbstractSolid lubricants are added to polymers to upgrade their tribological properties, especially in cases where adhesive and abrasive friction are valid. However, there are not enough studies on the effects of solid lubricants on particle erosion. This study investigated the effects on solid particle erosion behavior of three different well known solid lubricants (molybdenum disulfide, polytetrafluoroethylene, and graphite). These solid lubricants were added at three different ratios (5, 10, and 15 wt.%) to the two different type (rigid and toughened) epoxy resins. Garnet abrasive particles (180–400 μm) were blasted to the sample surface under 1.5 bar for 15 s to conduct solid particle erosion tests. The erosive wear mechanisms of neat and solid lubricant‐reinforced epoxy resins were investigated in relation to the epoxy type, solid lubricant type, and solid lubricant reinforcement ratio. Statistical analysis was performed according to response surface methodology to support the experimental results, and ANOVA tables were obtained. The wear and deformations that occurred on the surface after solid particle erosion were examined using a noncontact optical profilometer system and scanning electron microscopy, and a significant relationship was detected between the deformation on the surface and particle erosion. Analysis results showed that the factor causing the greatest erosion rate change was the epoxy resin type. Finally, it has been observed that all solid lubricants reduce the erosive wear resistance, and this resistance decreases as the weight ratio increases.Highlights
Investigations were conducted into the erosion behavior of two types of epoxy resins: rigid and toughened. The toughened epoxy resin exhibited greater resistance to erosion. Although it has the same type of content, on average, rigid epoxy worn 2–4 times more than toughened epoxy.
The effect of adding polytetrafluoroethylene tended to increase the erosion rate of both rigid and toughened epoxy resin less than that of other solid lubricants.
Graphite particles increased the erosion rate of toughened epoxy by 1.5–3 times and that of rigid epoxy by 2–3 times, depending on the value of the reinforcement ratio.
MoS2 increased the erosion rate of toughened epoxy by 1.5–3 times and that of rigid epoxy by 2–3 times.
Using a noncontact optical profilometer (for investigating surface topography), it was proven that there is a significant relationship between the erosion rate and roughness characteristics. Wear mechanisms were identified by SEM analysis.
Rigid-Flexible Coupling Dynamics Analysis of Boom-Hoisting System of Wind Power Crane
Authors: Cao Xuyang , Xu Guoyang , Hu Yongchang , Zhou Jihong , Kang Jian 
Published: June 2024

AbstractBased on the slenderness of wind power crane boom and the complexity of working environment, a mathematical model of rigid-flexible coupling dynamics including wind load and vibration characteristic analysis is carried out for the boom-hoisting system. The equivalent spring-damping system, spatial pendulum system and elastic double-force rod are used to simulate the elastic vibration of boom, the swing of lifting weight and the elastic vibration of wire rope, respectively. The kinematic characteristics of each component are described using a hybrid coordinate system. Simulation of wind loads through an instantaneous wind model consisting of the average and pulsating wind. Derivation of dynamic model for wind power crane under wind load based on the Lagrange equation. Taking a certain type of wind power crane as the research object, based on the derived mathematical model and ADAMS model, the response curves of boom and lifting weight are solved in MATLAB and ADAMS respectively for the rotary working condition, to verify the rationality and accuracy of the mathematical model and to obtain the influence of wind load on the swing angle of lifting weight. The analysis results provide a certain theoretical basis for crane structure design, control system design and wind turbine hoisting.
Analysis on Random Vibration and Impact Response of Vehicle-Borne Electronic Chassis
Authors: Zhu Zenghui , Meng Qingqin 
Published: June 2024

AbstractIn order to meet lightweight design requirement of vehicle-borne electronic chassis, vibration and impact response of chassis was analyzed based on the theory of random vibration and transient impact dynamics. Considering the influence of heat dissipation, corrosion resistance, material strength and economy of processing, weight reduction design was carried out according to vibration and impact response stress nephogram of chassis. The computation results show that the weight of chassis frame decreased by 16.4% and the first-order modal frequency of chassis decreased by 14.2% after weight reduction. Impact response had a lag relative to input impact spectrum. The increase of vibration stress was obviously higher than that of impact stress in different directions, which was still less than the corresponding material yield strength. That is, the structural strength of chassis after weight reduction meets the requirements of vibration and impact resistant design. The research results can provide theoretical basis of electronic equipment lightweight design under vehicle vibration and impact environment.
Design Method of Rail Grinding Profile Based on Wheel Rail Contact Relationship
Authors: Song Rui , Chen Dilai , Shen Gang 
Published: June 2024

AbstractWhen the railway track is damaged, it is essential to grind it in in a timely manner to enhance the wheel-rail contact performance. This paper relies primarily on the rolling radius difference function as the main design basis, taking the expected distribution between the wheel and the rail as the boundary condition. In cases where the abscissa of the rail is known, the Euler method is used to solve the differential equation to obtain the optimized ordinate of the rail. The profile of the rail is optimized, and the feasibility of the design method is verified through programmed algorithm. Based on the application results of the rail grinding profile design on the Wuhan-Guangzhou line, the rail light strip position and contact point distribution are more reasonable after grinding, the dynamic performance of the vehicle passing is improved, and the wheel-rail wear rate is reduced.
Parameter Optimization Methods of the Hydraulic Regenerative Braking System Based on the Actual Working Condition
Authors: Luo Tingting , Luo Nianning , Yang Jing , Huang Bo 
Published: June 2024

AbstractHydraulic regenerative braking system is a kind of complex MIMO (Multiple Input Multiple Output) system which is strongly nonlinear and multivariable, especially affected observably by the working condition. Moreover, it possesses the typical hybrid system characteristics since there are a multitude of nonlinear components internal which should result to continuous dynamic variation and discrete decision process. Hence, the traditional calculating method is difficult to analyze and evaluate the system accurately while operating on the actual working conditions. In order to solve the parameters optimization problem of the system which has significantly hybrid system characteristics constrained by the actual working conditions, this paper presents a new type of genetic algorithm by solving fitness function based on operation simulation, which provides a promising full condition optimization method for parameter optimization according to this kind of system. Simulation results show that this algorithm could optimize system configuration and enhance 3% for the braking energy recovery efficiency.
Design and Development of Dynamic Test Bench for Electric Wheel Load Sensing Suspension
Authors: Li Yan , Sun Pengbo , Chen Jiawei , Chen Xinbo 
Published: June 2024

AbstractBased on the modular design idea, a new type of dynamic test bench for electric wheel load sensing suspension was designed and developed, including load-bearing platform module, vertical force loading module, electric wheel module, spring mass simulation module, etc., and the test bench has the functions of wheel jump simulation, steering simulation and wheel vertical force and lateral force detection. The finite element simulation results show that the strength of the test bench meets the requirements. The results of the virtual prototype simulation show that the test bench can accurately measure the vertical and lateral forces experienced during the dynamic operation of the wheels.
Simulation and Analysis of the Internal Flow Field of Mining Solenoid Pilot Valve Based on Fluent
Authors: Wang Zhaoqiang , Zhu Lijing , Guo Lei , Lu Yangjun , Li Peixing , Lu Chenhun 
Published: June 2024

AbstractDuring the commutation process, the electromagnetic pilot valve experiences turbulent kinetic energy dissipation, leading to unstable internal flow and generating noise in the valve. Based on computational fluid dynamics (CFD), the phenomena of impact and energy consumption in a new type of high-pressure and high-speed electromagnetic pilot valve were investigated. Then flow field simulations were conducted under various differential pressure and valve opening conditions, in order to obtain distribution maps of turbulent kinetic energy, pressure, and velocity. Finally, the simulation results were compared, and the results showed that increasing the outlet pressure and enlarging the valve port opening have a positive impact on mitigating the structural issues in the pilot valve.
Research on EMC Simulation of Electric Drive System of Electric Engineering Machinery
Authors: Ming Qiaohong , Wang Yangyang , Zong Meiyu 
Published: June 2024

AbstractIn order to suppress the electromagnetic interference in electric construction machinery, improve the stability and safety of the vehicle on the influence factors of electric construction machinery EMC system analysis, electric drive system due to the internal power electronic equipment for a long time in the high voltage, high current conditions and become the main influence factors of electric construction machinery EMC. The main methods to reduce electromagnetic interference of electric drive system grounding, shielding and filtering are expounded, which leads to the emulated research of EMC simulation of electric drive system of electric engineering machinery. The equivalent circuit model of battery, electronic control, motor and test system is established, and the low-pass filter composed of inductor and capacitor is designed. And the combined three electric system, test system, filter circuit composed of the model of simulation analysis, with or without filter input current, different frequencies of input and output voltage signals compared, the results show that adding filter can effectively improve the conducted interference, the use of RLC filter composed of four RLC components, can effectively improve the signal low frequency bias and high frequency distortion.
Reliability Optimization Design Method for Firearms Automaton Mechanism
Authors: Fang Yichuan , Wang Yongjuan , Li Pengchao , Gu Tongguang , Gao Xin’an 
Published: June 2024

AbstractIn order to deal with the reliability optimization design problem of mechanisms containing multiple motion phases and multiple collisions, this paper takes the firearms automaton as an example and gives a general method to deal with such problems. Firstly, the motion stages are divided according to the automatic cycle diagram of the firearms automaton, and the discrete dynamics model of the firearms is established. Then the reliability model of the automaton mechanism is established based on the performance margin theory. Finally, taking the pressure coefficient of air chamber, the friction coefficient of the guide, the stiffness of the counter-recoil spring and the stiffness of the hammer spring as design variables, the optimized design variables are obtained through the calculation of the sequential quadratic programming (SQP) algorithm. The results of the optimized design are close to the idealized results of the existing products, which proves the rationality and effectiveness of the mechanism reliability optimization design method proposed in this paper.
Study on Kinetic Energy Conversion of Perforating Shaped Charge Jet in Perforating Completion
Authors: Li Zhenxiang , Yuan Fayong , Guo Ruifeng , Chen Zhihang , Zhang Zhengjin 
Published: June 2024

AbstractThe energy of a perforating shaped charge is the cause of transient pressure fluctuations in a wellbore. Based on the law of energy conservation, the energy can be divided into the kinetic energy of a jet, the residual energy of a wellbore, and energy dissipation. The jet kinetic energy is used to penetrate a perforating gun, casing, and formation. The residual energy of a wellbore is used to cause wellbore pressure fluctuations. Based on the fluid–structure coupling principle, a jet penetration model was developed to improve the conversion rate of the jet kinetic energy, reduce the residual energy of a wellbore, protect wellbore safety, and reduce the downhole perforating completion accident. This model took into account a penetrating charge shell, explosive, liner, perforating gun, and casing. Meanwhile, the penetration process and kinetic energy conversion of a perforating shaped charge jet were studied. The obtained results indicated that the kinetic energy conversion of a perforating shaped charge jet is significantly affected by the cone angle of a liner, the thickness of a liner, and explosive mass. The 70°cone angle of a liner, its 1 mm thickness, and the 25 g explosive mass have the maximum kinetic energy conversion in the research range.
Research on the Design and Verification Process of Mechanical Penetrations in Reactor Compartment
Authors: Zhang Qian , Qian Zuoqin , Wang Qiang , Wang Xinyu 
Published: June 2024

AbstractMechanical penetrations, as important pressure pipelines penetrating the reactor compartment, withstand high temperatures and pressures. The current complete design and verification process for mechanical penetrations. This article focuses on the problem of stress concentration and easy damage of the penetration components in the reactor compartment under high temperature and high pressure environment. Combining with the existing regulations of nuclear power plants and ships, finite element analysis method is used to analyze the stress of the penetration components under specific high temperature and high pressure and ship ultimate load coupling. At the same time, based on the simulation analysis results, the structural dimensions of the penetration components are optimized, and a mechanical penetration verification process is designed. The coupled thermal stress results of the penetration indicate that the stress of the penetration is too large at the tail of the sleeve, with the values of primary film stress Pm and primary bending stress Pb being 228.2 and 275.91 MPa, respectively. From this, it can be seemed that there is obvious stress concentration at the junction of the support ring and sleeve, as well as at the transition point of the insulation layer, which is the weakest area of the penetration.
Algorithm Design of a Variable Height Wheel-Legged Robot with Fuzzy Theory and PID Fusion Control
Authors: Cao Xuyang , Pu Changlin 
Published: June 2024

AbstractA balancing control algorithm for a wheel-legged robot is designed for current logistics and distribution mobile robots. Since the wheel-legged robot is a nonlinear underactuated system, it is crucial to realize the balanced control and robustness of the wheel-legged robot in the absence of an accurate dynamics model. In this paper, an optimal control scheme for the wheel-legged robot based on the fusion control of variable-height adaptive fuzzy PID and conventional PID is designed. The balance of the wheel-legged robot is controlled by adaptive fuzzy PID control, the lifting and attitude changes of the two sides of the wheel-legs are controlled with high precision by traditional PID control, and the speed and steering control of the wheel-legged robot is not affected by the structure of the model, and is controlled by traditional PID control with linearization. The attitude of the robot is detected in real time using the BMI088 attitude sensor to realize the positional control. Experimental and simulation results show that the control algorithm of the wheel-legged robot designed in this paper is reliable, and the robot runs smoothly and robustly.
A Machine-Vision-Based Hub Location Detection Technique for Installing Wind Turbines
Authors: Cao Xuyang , Hu Yongchang , Xu Guoyang , Song Shuai , Tie Xiaochun 
Published: June 2024

AbstractA position detection approach based on machine vision is developed to address the issue that the traditional wind turbine hub lifting procedure relies on the location of engineers and cannot provide quick feedback on the position information. A camera and a range sensor are mounted on the suspended object to enable real-time detection of the fan hub’s posture state in relation to the engine room. A monocular camera positioning technique based on circular features is created for this detection method. The relative pose coordinates of the hub are computed using the position data given by the range sensor. A filter for the range sensor is created based on the hoisting features of the actual working circumstances. The filter applies a filter to the data from the ranging sensor, considerably reducing measurement error and enhancing detection technique stability.
Adaptive Control of Drilling Rig Power Head Speed
Authors: Xu Xinxin , Cai Wanzhi 
Published: June 2024

AbstractIn the drilling process, the adjustment of drill pipe rotational speed is essential to accommodate the variations encountered in different geological strata. However, the existing low automation level in drilling rigs and heavy operator reliance often result in suboptimal speed regulation, leading to low drilling efficiency. An adaptive control approach for power head speed based on a fuzzy clustering algorithm was proposed, which utilizes the fuzzy clustering algorithm (FCM) to cluster drilling parameters, including drilling pressure, rotational speed, and drilling speed, to identify of distinct strata. Furthermore, the rotational speeds of the clustering centers of different strata were used as the input rotational speeds of its control system, the simulation results show that the speed control can be realized by controlling the opening of the valve port, and the fuzzy PID control is used to realize the adaptive control of the speed and the tracking of the speed curve.
Fluctuation of Near-Wall Pressure During the Cavitation Bubble Collapse
Authors: Yuan Zhicheng , Li Haowen , Yang Meng , Bian Yongming , Chen Li 
Published: June 2024

AbstractCavitation bubble collapse, which generates strong shock waves and high-velocity liquid jets, is responsible for the erosive damage to hydraulic components. In order to assess the fluctuation of near-wall pressure, in this work, an open-source package OpenFOAM is utilized for solving the Navier–Stokes equation. To track the liquid–air interface, the volume of fluid (VoF) method-based compressibleInterFoam solver is selected, and its shipped dynamic contact angle model is modified to obtain better accuracy when considering the wettability of substrates. Numerical methods are first validated by comparing with experiment, and then it is extended to study the effect of bubble diameter, pressure difference, and surface wettability on the fluctuation of near-wall pressure. Simulation results show that the initial sphere bubble goes through three stages of growth, shrinkage, and collapse near the wall. A larger bubble size leads to higher impact pressure due to the higher speed of the liquid jet. The difference in initial pressure in and out of the bubble has a great effect on the collapse behaviour. In addition, a hydrophobic surface, meaning hard liquid pining, can speed up the damping of near wall pressure. The findings in this work will be a guide to designing hydraulic components for limiting the erosive damages of cavitation bubble collapse.