Yanfang He
Abstract.Facility layout problems constitute a classical and evolving research area in engineering management. This paper provides a structured review of research progress across various layout configurations—from Single Row to Multi-floor Layouts—and their solution methodologies, including exact algorithms and heuristic/metaheuristic approaches. It also synthesizes advances in mathematical modeling and identifies future research directions in the field, At the same time, it provides some references and optimization methods for future facility layout work.
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Haojun Chen
Abstract.This study focuses on applying infrared interferometry to calculate the precise thickness of silicon carbide epitaxial layers and conducting reliability analysis of the results. Addressing the complexity of epitaxial layer refractive index variation across infrared spectral wavelengths, this research proposes a key assumption: the refractive index can be treated as constant within specific wavenumber ranges outside the vicinity of the vibrational absorption peak near 1000 . To validate this hypothesis, experimental data from two incident angles were visualized. Within the specified wavenumber …
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Ke Lv, Shuai Li, Yu Yang, Jiangyong Liu, Ran Zhang
Abstract.With the rapid growth of renewable energy and electrochemical energy storage and conversion technologies, the need for high-performance electrode materials is growing increasingly strong. Because of their large specific surface area, tunable three-dimensional pore structure, and effective mass transfer characteristics, porous electrodes are now essential for improving the performance of electrochemical energy devices. However, there are still many fundamental obstacles in the way of the development of porous electrodes: First, the stability of microstructures during preparation and cycling …
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Chengzhuo Yuan, Chenlong Gao, Xiong Ma
Abstract.Fault sealing and opening properties are crucial to hydrocarbon migration and accumulation. Fault sealing and opening properties refer to the displacement pressure difference caused by the lithological and physical property differences between the hanging wall and footwall of a fault, and this pressure difference controls the fluid flow capacity between the two sides of the fault. In terms of migration direction, fault sealing and opening properties are divided into vertical sealing and opening and lateral sealing and opening; in terms of the nature of the isolation zone, they are divided into …
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Zhi Li
Abstract.In previous studies, efforts regarding fracturing fluid fluid loss have predominantly aimed at "fluid loss reduction." This study, however, focuses on shifting from "fluid loss reduction" to "fluid loss promotion." This paper combines orthogonal experimental design with nuclear magnetic resonance (NMR) technology to reveal the mechanism by which fracturing fluid fluid loss distance affects displacement efficiency in unconventional reservoirs. Experiments found significant correlations between fluid loss distance and injection pressure differential, reservoir permeability, and fracture …
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Lin Zhong, Xulong He, Dan Zhu, Guorong Wang, Yang Wang, Chuan Wang, Miao He
Abstract.The height of the slip teeth directly affects the gripping efficiency of Snubbing Units. However, there is currently a lack of experimental methods for quantitatively assessing the height of worn slip teeth and their gripping capability. Therefore, a die-cutting inspection method was adopted to measure worn slip heights quantitatively. An experimental platform was developed to simulate the actual loading conditions of Snubbing Units during pipe-to-pipe gripping. Using image processing techniques based on pressure-sensitive paper color changes and grayscale values, experiments were conducted to …
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Rui Jian
Abstract.Gas drainage is crucial for coal mine safety and clean energy use, with sealing material performance directly affecting drainage efficiency and mine safety. This paper reviews the research and trends of sealing materials for coal mine gas drainage. It categorizes and details traditional (cement-based, polyurethane-based) and new (inorganic expansive, nano-modified, self-healing, composite) sealing materials. The paper also identifies key issues with current materials, such as expansive stability, durability, and environmental adaptability. Considering smart material technology and green mining …
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Yifan Shi
Abstract.To address the issues of low modeling efficiency and poor data-model associativity in shield tunnel engineering, this study explores two distinct BIM-based parametric modeling paths. The first path utilizes the Revit platform as a foundation, establishing a "data-program-component" collaborative drive mode through the Dynamo visual programming environment. This approach achieves the automated placement of segments under complex spatial poses by leveraging parametric adaptive families. The second path is based on the OpenRail platform, utilizing API-based custom development to encapsulate …
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Jiju Xu, Yiran Li
Abstract.The rapid advancement of Large Language Models (LLMs) has increasingly highlighted the value of Artificial Intelligence (AI) translation in specialized domains. Sustainability reports in the energy sector, as typical informative professional texts, exhibit characteristics of terminology density, logical rigor, policy orientation, and interdisciplinary integration. Their translation quality directly impacts the effectiveness of technical exchanges, carbon reduction cooperation, and global energy governance among multinational energy enterprises, thereby necessitating stringent standards for …
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Weidong Zhang, Guanyu Zhu, Jiajun Tang
Abstract.The influence of steel pipe wall thickness, steel pipe length, ultra high performance concrete with coarse aggregate (UHPC-CA) strength, and steel grade on the axial compressive bearing capacity of round steel pipe UHPC-CA long columns was analyzed using orthogonal experimental method. The results indicate that the influence of various factors on the axial compressive bearing capacity of round steel tube UHPC-CA long columns is in the order of steel grade>steel tube wall thickness>steel tube length>UHPC-CA strength. The axial compressive bearing capacity increases with the increase of steel …
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Hongbin Liu, Tao He, Jun Li, Hanjun Liu, Changwei Zhou
Abstract.In composite strata, the excavation efficiency of tunnel boring machines (TBMs) is significantly influenced by the morphology of stratigraphic interfaces. This study employs the Abaqus explicit dynamics module to establish an interaction model between wedge-toothed cutterheads and composite strata, investigating the matching relationship between stratigraphic inclination (15°–60°) and cutterhead parameters (tooth diameter, tooth count, penetration resistance, rotational speed). Results indicate that the specific rock-cutting energy exhibits a V-shaped variation with stratum inclination, first …
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Su Liu, Anjin Peng
Abstract.With the continuous evolution of wireless communication systems in terms of architectures, operating frequency bands, and network structures, the communication environment has become increasingly complex and exhibits diversified characteristics. In communication system testing, electromagnetic environment simulation, and countermeasure scenario research, higher requirements have been put forward for the flexibility of jamming signals regarding waveform types, parameter configuration, and transmission modes. However, traditional communication jamming equipment generally suffers from large …
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Hanlin Lyu, Hangxin Wei
Abstract.At present, research on high-altitude welding robots remains relatively limited. In outdoor environments, welding operations in areas such as steel structures and high-rise construction are typically performed manually. This practice poses significant risks to workers’ personal safety. To address this design gap, one promising approach is to integrate climbing robots with welding robots. Accordingly, this paper reviews the current state of development of climbing robots from a design perspective and discusses key design considerations for equipping climbing robots with welding modules.
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Zihao Yan, Hongchang Sun, Chunwei Wu, Minggao Shen, Xuanhan Zhang, Yule Li
Abstract.This study focuses on the 3-RCU parallel robot as the support mechanism. First, the configuration design of the 3-RCU parallel mechanism is completed, and its degree of freedom (3, including z-axis translation and rotation around x and y axes) is calculated using the spatial mechanism degree of freedom formula, followed by the construction of the mechanism's kinematic model. Through accurate dynamic modeling, the research captures the nonlinear variation of support interface stiffness, providing key parameters for the subsequent design of parallel mechanisms and laying the theoretical …
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Jian Sun, Yuetao Li, Bin Zhang
Abstract.The integration of the On-Board Charger (OBC) and the Low-Voltage DC-DC Converter (LDC) represents a critical evolution in Electric Vehicle (EV) power electronics, aiming to maximize power density and minimize weight. However, conventional magnetically integrated topologies, such as those utilizing three-winding transformers, often suffer from severe cross-regulation and poor light-load efficiency during standalone LDC operation. This paper proposes a comprehensive analysis of a decoupled "2-Transformer" architecture that mitigates these drawbacks. We present a rigorous mathematical model of …
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Yuehong Wang
Abstract.For deepwater jack-up wellhead platforms, a tensioner-based design scheme for tensioning the riser pipe is proposed. Based on the displacement and stress response of the riser pipe, three riser pipe sizes and corresponding tension forces were selected. Furthermore, a coupled analysis model was established between the tensioned riser pipe and the jack-up platform. Under a 550-ton tension force, the impact of three riser pipe models on the overall performance of the deepwater mobile wellhead platform was analyzed. The results indicate that the tensioned riser pipe can reduce the first two …
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Rifu Li, Ran Wang
Abstract.China's coal production has formed a large number of goaf, which contains a large amount of coal and coalbed methane resources. If these resources are stored in the goaf, it will not only cause a waste of resources, but also cause environmental pollution if the coalbed methane in the goaf leaks into the atmosphere. Therefore, the utilization of goaf resources is imminent. In order to achieve the purpose of efficient extraction, it is necessary to evaluate the amount of goaf resources. As an important part of goaf resources, the desorption law of abandoned coal is affected by many factors, …
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Jianxu Hao, Xingchang Zeng, Gang Liao, Tianzhou Li
Abstract.The tee is inevitably eroded by drilling fluid during operation, resulting in a decrease in its lifespan. The surface strengthening of the three-way inner cavity can effectively improve its service life. However, the specific erosion behavior and surface strengthening effect evaluation of the tee still need to be studied. This article establishes a computational model for the erosion behavior of the tee and the surface strengthening of the inner cavity through finite element simulation. The calculation results indicate that the maximum erosion rate occurs at the intersection line between the …
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Mengna Li
Abstract.As coalbed methane exploration and development advance into deeper and more geologically complex areas, borehole stability has become one of the core technical bottlenecks restricting the safe and efficient development of coalbed methane. This paper systematically reviews recent research progress in the field of coalbed methane wellbore stability, with a focus on two main directions: mechanical analysis models and numerical simulation methods. First, it elaborates in detail on five types of mechanical models based on approximate strength theory, fracture damage mechanics, weak plane …
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Lin Zhong, Wenzi Luo
Abstract.The wear performance of 55SiMoVA bearing steel under extreme service conditions in oil and gas screw drilling tools is critical to the reliability and operational lifetime of thrust ball bearings. In service, these bearings experience severe friction between the balls and raceways, leading to accelerated wear and even catastrophic failure. Conventional surface modification techniques, such as carburizing, nitriding, shot peening, or surface coatings, provide limited improvements in surface properties and often fail to sustain high-load, high-temperature, and complex lubrication environments. …
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Na Zang
Abstract.The Loze River in Yiliang County exhibits significant geological hazards along its banks. This study investigates the geological environment of the river valley slopes from two perspectives: engineering geological conditions and slope structure. It summarizes the characteristics of geological hazard development. Finally, a multiple regression analysis method is employed to evaluate slope stability. By analyzing the statistical patterns between deformation instability phenomena and geological environmental conditions/ factors in existing river valley sections, a multiple regression prediction …
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Fenfen Yong, Xiaohu Wang, Teng Hu, Guilin Li, Yanjun Li
Abstract.Multi-phase bridge power amplifiers can meet the multi-degree-of-freedom control requirements of magnetic levitation systems, but the problem of large current ripple restricts the improvement of control accuracy. Therefore, a four-phase bridge converter for active magnetic suspension bearings is proposed, and a reverse shared winding driving path is constructed. At the same time, opposite carrier modulation technology is adopted, making the converter operate in continuous conduction mode for most of the time during normal operation, effectively reducing current ripple. To verify the …
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Changshuai Shi, Xin Du
Abstract.This paper establishes a torsional model of a two-degree-of-freedom drill string system composed of a rotary table and bottom-hole assembly, constructs a friction model between the drill bit and rocks, and considers the influence of five different rock types on the stick-slip vibration of the drill string system. The stick-slip vibration of the drill string system is analyzed under changes in top drive torque, top drive rotational speed, and weight on bit. The results show that different rocks cause varying degrees of stick-slip vibration due to their distinct friction coefficients: rocks with …
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Zhenyu Huang, Xiaohu Wang, Teng Hu, Guilin Li, Yanjun Li
Abstract.To enhance the robustness and stability of active magnetic bearing (AMB) rotor systems under complex disturbances and nonlinear operating conditions, this paper proposes an adaptive active disturbance rejection control (RLADRC) strategy based on reinforcement learning. Traditional ADRC compensates for unbalanced forces through an extended state observer (ESO), but its key parameters (observer gains) rely on empirical tuning, making it difficult to adapt to dynamically changing environments. This study introduces reinforcement learning algorithms to optimize observer gains online through …
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Chong Xie, Shuli Wang
Abstract.With the increasing proportion of intermittent renewable energy sources such as wind and solar energy in the power grid, the importance of energy storage technology in ensuring stable operation of the grid has become increasingly prominent. Compressed Air Energy Storage (CAES) technology, with its advantages of large scale, long lifespan, and relatively low cost, is considered to be a highly promising large-scale energy storage method. This paper focuses on two typical operation strategies for the compression phase of CAES systems: constant pressure operation and sliding pressure operation. By …
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Huan Zhao, Teng Hu, Sijia Peng, Zichun Ma
Abstract.In view of the deformation generated during the casing end milling process, the casing parts are meshed and nodaled through Hypermesh, and the finite element simulation software ABAQUS is developed for secondary development by Python, so as to realize the simulation process of quasi static outer ring belt end milling. Combined with the simulation results, the deformation law in the process of casing end milling is analyzed, and the maximum deformation is near the machining position, and the deformation gradually decreases as it moves away from the machining position; the local geometric …
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Hongbin Liu, Bangyao Tang, Yi Zhang, Daqin Zhang, Zhen Wang
Abstract.The seal of a flow control valve is a critical component in hydraulic systems. Seal failure may cause leakage, reduced energy efficiency, and unplanned shutdowns, posing severe threats to safe system operation. Traditional seal fault diagnosis methods often suffer from strong hysteresis and excessive reliance on expert experience; hence an efficient, real-time online seal monitoring technique is urgently needed. This paper proposes a seal fault diagnosis method for flow control valves based on a Convolutional Neural Network with a Convolutional Block Attention Module (CNN-CBAM). First, a …
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