Hui Wang, Zhenning Su, Chang Liu, Fancheng Meng, Bo Song, Shiying Zhang
Abstract.Bearing-rotor systems are of critical significance to advanced rotating equipment. However, under high-speed operating conditions, defects may occur on the ball surfaces due to increased contact stresses. To understand the influence of ball surface defect on the bearing-rotor systems, the time-varying displacement excitation is proposed. Defect size changes contact deformation in the bearing. The contact force is changed as a result. These factors are incorporated into the dynamic model. The model describes a bearing-rotor system with a defect-ball bearing. Bifurcation diagrams is employed, …
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Hui Kong
Abstract.In response to the green and low-carbon transformation demands of the shipping industry, ship hybrid power systems, with their significant advantages in reducing fuel consumption and controlling pollutant emissions, have become a research hotspot in the field of ship power. In order to lay a theoretical foundation for subsequent research, identify the research entry point, and prove the necessity and innovation of the research. Based on the relevant research achievements in the field of ship hybrid power energy management, this paper compares the existing energy management strategies from the …
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Xueping Chang, Wencheng Mu
Abstract.This study examines the static and vortex-induced vibration (VIV) responses of a composite catenary riser conveying internal gas–liquid two-phase flow under external ocean currents. A static model of the catenary riser incorporating pipe–seabed interaction is formulated based on the principle of minimum potential energy, and the governing equations are discretized and solved using a finite-difference scheme combined with the Newton–Raphson iterative method. For dynamics, a wake-oscillator model is coupled with the riser equations to predict combined in-line and cross-flow motions, while the …
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Fulong Wang, Xingyu Hou, Weidong Liu, Yufen Zhu, Yini Guo
Abstract.Although the Chang 8 reservoir in the Ordos Basin holds significant resource potential as a crucial exploration and development interval, existing research has primarily focused on regional geological patterns, with limited systematic analysis of reservoir characteristics and production performance. To address this gap, this study investigates the Longdong and Jiyuan areas by integrating data on petrological characteristics, physical properties, pore structures, percolation features, and production performance. A systematic comparison of reservoir differences between the two regions was …
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Jinyu Liu
Abstract.Underwater Wireless Sensor Networks (UWSNs) have attracted significant research interest due to their broad applications in ocean exploration, environmental monitoring, disaster prevention, and military surveillance. The unique characteristics of the underwater environment—such as high propagation delay, limited bandwidth, node mobility, and energy constraints—pose great challenges for reliable and efficient data delivery. Routing protocols play a crucial role in addressing these challenges by determining optimal paths from underwater nodes to surface sinks. This paper presents a comprehensive …
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Diqing Wang
Abstract.To study the flexural performance of ceramic wool autoclaved aerated concrete composite wall panels (ceramic wool-AAC composite wall panels for short), four-point bending tests were conducted on the composite wall panels. The failure load of the panels was the measured value corresponding to the failure criteria specified in the code. The influences of structural forms on the flexural capacity, deflection, mid-span strain, interlayer slip and failure phenomena of the wall panels were discussed. The research results provide a theoretical basis and experimental data support for the design and …
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Shuguang Liu
Abstract.Based on the structural characteristics of actual PCHEs, a primitive header model suitable for predicting and analyzing the flow distribution characteristics of gas‑liquid two‑phase flow inside PCHEs was established by taking the heat exchanger header and twelve microchannels as the modeling objects and using natural gas liquid‑vapor mixture as the working fluid. The model considers the interaction between gas and liquid phases and tracks the interfacial movement of gas‑liquid two‑phase flow based on the VOF method. Single‑phase flow studies were carried out with liquid methane and gaseous …
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Zirui Wang, Yiting Zhang, Yahui Mao, Junchen Wu, Yifei Wang, Longhe Hu
Abstract.To promote the utilization of combustion by-products such as fly ash in green building materials and mitigate heavy metal pollution in the environment, fly ash-based geopolymers were prepared to immobilize lead ions (Pb²⁺). Systematic experiments were conducted to investigate the immobilization efficiency of fly ash-based geopolymers for Pb²⁺ and the mechanical properties of the geopolymer matrix. Furthermore, the microstructure of the geopolymer matrix and the intrinsic mechanism of Pb²⁺ immobilization were elucidated via X-ray diffraction (XRD), scanning electron microscopy (SEM), and …
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Songmao Wei, Yuan Wang, Yuntong Zhao
Abstract.In recent years, new energy vehicles have achieved leapfrog development, yet energy consumption performance remains a critical bottleneck affecting user experience. The energy consumption issue in electric vehicles is essentially a concentrated reflection of the efficiency of energy conversion, storage, and utilization under complex working conditions and system interactions. For example, the remaining driving range is typically estimated dynamically based on instantaneous energy consumption. Factors such as rapid acceleration, air conditioning use, and low-temperature environments can easily …
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Shijie Miao, Peng Wang, Zhenhua Liu, Qiaohong Hao, Weiyi Qu
Abstract.To address the challenges of information exchange and enable real-time status monitoring of components awaiting remanufacturing, this paper presents a semi-flexible UHF RFID tag antenna designed for direct mounting on metallic objects. Numerical simulations were conducted to analyze the transmission coefficient and mutual impedance patterns, achieving conjugate impedance matching between the antenna and the chip, thereby establishing the desired resonant frequency. The antenna's resonant frequency can be conveniently adjusted via coarse and fine tuning of specific geometric parameters. …
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Hepeng Zhao
Abstract.To address the growing challenges of disorderly electric bicycle (e-bike) parking and the operational inefficiency caused by electronic rear-wheel locks on shared models, this paper proposes the design of a specialized e-bike mover. Based on an analysis of technical parameters from four typical e-bike models, a worm gear transmission mechanism was selected for its superior self-locking properties and its ability to adjust for various tire diameters. The device was modeled and assembled using SolidWorks, and its structural integrity was validated through static finite element analysis (FEA). …
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Qingzheng Fang, Yongjun Hou
Abstract.Screen mesh is the core component of drilling vibration screens and a key consumable part in the field of drilling engineering. Traditional vibration screens generally suffer from technical bottlenecks such as low screening efficiency and frequent screen clogging in the screening of fine-grained materials. With the continuous development of screening technology, various technical solutions to alleviate screen clogging have been proposed successively, among which ultrasonic vibration-assisted screening is a relatively advanced technical form. Taking the screen mesh of drilling vibration screens …
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Pan Fang, Ao Shen, Chuan Yang, Yongchun Wu, Caijun Yu, Qing Yu
Abstract.Purpose To address the issue that current dynamic models of drill strings typically simplify the mathematical modeling of the interaction between the drill bit and the rock, thus failing to accurately reflect the actual behavior of the drill bit, this study aims to investigate the dynamic behavior of the horizontal well drill string system equipped with a cone bit under different drilling parameters. Methods In this work, a dynamic mathematical model of the coupled nonlinear system of drillstring-cone bit-rock under the wellbore trajectory of a three-dimensional curved well is established. The …
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Yi Zhou, Yi Zhou, Zicong Wang, Yang Jiang
Abstract.This study investigated the tribological behavior of helical composite seals for high-speed cone bits under dynamic loading through an integrated experimental–computational approach, systematically elucidating their wear mechanisms. To address limitations of the classical Archard model’s static assumptions, an innovative framework for predicting dynamic wear was developed by coupling time-varying contact stress integration with Hertzian contact theory, establishing explicit dynamic correlations among load–geometry wear parameters to enable real-time wear volume prediction. Wear evolution was …
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Cheng Chen, Siyu Wang, Rui Zhong, Zexi Fan, Penghua Qian
Abstract.Carbon nanotubes (CNTs) are a kind of nanomaterial with a unique one-dimensional hollow structure and excellent mechanical and electrical properties. Because of their excellent mechanical strength, high aspect ratio, and good electrical and thermal conductivity, CNTs have been applied in many fields. In addition, its unique nanotube structure and large specific surface area are conducive to the construction of stable carrier transport channels, making it a hot spot in the field of polymer composites. However, CNTs are chemically inert on the surface, and strong van der Waals interactions exist …
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Longkun Luo, Liang Guo, Lixu Mou
Abstract.To address unreasonable scheduling in distributed 3D printing systems under dynamic disturbances, an event-driven multi-objective dynamic scheduling optimization method is proposed. First, a model minimizing makespan and total processing cost is constructed, defining disturbance triggers and rescheduling criteria. Second, an improved NSGA-II algorithm is designed, featuring a chromosome segmentation mechanism to coordinate local and global optimization, adaptive operators for convergence efficiency, and a cost-aware greedy mutation strategy to enhance solution quality. Simulations show that, …
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Yongwen Chen, Yongjun Hou, Changqing Mou, Zhe Lian, Yongheng Ma
Abstract.To address the power loss and high-frequency "material jamming" issues caused by improper motor selection in dual-motor driven horizontal screw discharge centrifuges, this paper proposes a motor power calculation method based on a 2K-H differential transmission mechanism to optimize motor configuration. First, the rotational speed relationships between the components of the differential are systematically analyzed using the transmission ratio method, and the external torque distribution of each component is derived using the torque balance equation, laying a theoretical foundation for power …
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Min Wan, Qi Cen, Lifang Zhou
Abstract.This paper investigates the tracking control problem of a stable platform with a rotating guidance system that has sensor and actuator failures. In order to improve the robustness of the angle control of rotary steering system drilling tools, a fuzzy adaptive finite-time control is proposed. Compared with existing control strategies, this paper integrates dynamic surface control technology and finite-time technology through adaptive fuzzy backstepping control to address the trajectory tracking problem of a rotating guidance system with simultaneous sensor and actuator failures. A fuzzy state …
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Chenhao Tian, Yongxiang Huang, Shaonan Wang, Chenjun Li
Abstract.Natural gas, as a clean and efficient energy source, occupies an increasingly important position under the background of the "dual-carbon" strategy and energy structure transformation. However, affected by various complex factors such as reservoir heterogeneity, gas-liquid-solid multiphase flow, inter-well interference, and lack of bottom-hole pressure, traditional gas well productivity prediction and production allocation methods have problems such as insufficient accuracy, poor adaptability, and high dependence on manual work, making it difficult to meet the needs of efficient development of …
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Zhi Zhang, Zhaoming Zhou, Yanqin He
Abstract.Under the background of large-scale development of new energy, the operation and management of lithium battery energy storage systems face many challenges. Digital twin technology provides effective solutions for the intelligent upgrading of energy storage systems. This article focuses on the research of digital twin technology for lithium battery energy storage. Firstly, it clarifies the core connotation and composition architecture of digital twin technology, and then focuses on sorting out its research achievements in key areas such as model construction, real-time monitoring, life …
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Binglin Li, Ping Luo, Manzhu Jiang
Abstract.The rotor profile has a significant influence on the performance of Roots vacuum pump. This paper proposes a novel profile which consists of a superellipse at the top and a conjugate curve at the waist. The mathematical model for the superelliptic rotor profile is established, and the constraint equations of superelliptic parameters are derived to avoid undercutting, carryover, and interference. It is found that the area utilization rate increases with the axis ratio increases when the superelliptic index is constant. In order to evaluate the pumping performance of the superelliptic rotor, …
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Saiyu Tang, Liang Guo
Abstract.Addressing the problems of insufficient powder feeding accuracy and significant flow fluctuations during the automated preparation of drilling fluids in laboratory environments, a screw feeding mechanism based on a variable-pitch screw was designed. Discrete Element Method (DEM) simulations were performed using EDEM to investigate the powder conveying characteristics under different structural parameters. A comparative analysis of the mass flow rate and flow fluctuation was conducted. Under the same operating conditions, the mass flow rate of the variable-pitch screw was 0.373 g/s with a …
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Feng Zhou
Abstract.This paper presents an intelligent environment monitoring and control system for greenhouses based on the STM32 microcontroller. Taking STM32 as the core, the system integrates sensors for air temperature and humidity, soil moisture, light intensity, CO₂ concentration, and soil pH to collect key environmental parameters in real time, providing comprehensive data for evaluating crop growth conditions. An OLED display is adopted for on-site visualization, and a WiFi module is employed to upload data to the MQTT cloud for remote monitoring via mobile devices. Furthermore, the system realizes …
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Zequn Ding, Tianhu Wang, Huijun Xia, Jungang Wang, Yihan Liu, Tailiang Yu
Abstract.With the deepening implementation of the "Healthy China 2030" strategy, health issues have increasingly garnered widespread attention. Understanding one's health status primarily involves monitoring the normality of basic physiological parameters. For instance, conditions such as fever or pneumonia may manifest as an elevated heart rate and more rapid, deepened breathing. Timely acquisition of basic human physiological information has thus become a critical requirement in the modern medical industry. To address these challenges, this project proposes designing a non-contact health detection …
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Haiyang Feng, Liangliang Dong, Chao Zhou
Abstract.Aiming at the problem of insufficient understanding of the influence of different steam injection methods on the heat transfer law of wellbore steam circulation electric heating in SAGD technology for heavy oil thermal recovery, based on the theory of heat transfer and fluid mechanics, this paper establishes a numerical calculation model of wellbore steam circulation electric heating to simulate the process of electric heating and steam synergistic heat transfer in horizontal steam injection wells. The difference of temperature field distribution between wellbore and electric heater of short …
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Cheng Zhao, Jinling Song, He Wang, Yinan Gao, Yingjie Liu, Yunen Chen
Abstract.Adolescence represents a sensitive developmental period characterized by profound neurobiological maturation and increased vulnerability to anxiety disorders. Among the cognitive domains influenced by anxiety during this stage, uncertainty processing occupies a central position. Uncertainty arises when environmental outcomes are ambiguous, unpredictable, or probabilistic, requiring integration of cognitive control, emotional regulation, reward evaluation, and attentional allocation. Converging evidence suggests that adolescents with elevated anxiety exhibit heightened sensitivity to potential …
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Zhengze Ma
Abstract.Leaf Area Index (LAI) is a key biophysical indicator characterizing vegetation canopy structure and ecosystem productivity. Focusing on the complex terrain of the Wuding River Basin in the Loess Plateau, this study performed LAI retrieval using remote sensing data from 2001 to 2024 combined with advanced algorithms.Based on the analysis of long-term time-series LAI data, this study revealed that LAI in the Wuding River Basin exhibited a distinct unimodal monthly growth rhythm: the peak value steadily occurred in July and August, the midsummer period with the most abundant hydrothermal …
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Zongyuan An
Abstract.With the continuous advancement of electricity market reform, the electricity spot market has been gradually improved, and electricity price forecasting has become increasingly important in power system operation and market decision-making. Due to the strong nonlinearity, volatility, and temporal dependence of electricity price series, it remains difficult to achieve high forecasting accuracy using conventional methods. To address this issue, this paper proposes an electricity price forecasting model based on a Bidirectional Gated Recurrent Unit (BiGRU) and an Attention mechanism. The …
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Guoxin Liu, Jianwen Ma
Abstract.Against the backdrop of the “Dual Carbon” goal proposed during the 14th Five-Year Plan period, China’s infrastructure development is advancing toward green and low-carbon patterns, in which ship carbon emissions have become a major environmental issue. As an effective tool for recording ship activities, Automatic Identification System (AIS) data provides a reliable means to accurately quantify carbon emissions. Based on AIS data, this paper adopted a grid method combined with the STEAM model to estimate ship carbon emissions in a port area by zone, and introduced the Spearman correlation …
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Chang Liu
Abstract.To address the critical industry pain points in streaming data scenarios across industrial production, intelligent transportation and other related fields—namely continuous performance degradation of classification models induced by concept drift, the absence of dedicated closed-loop drift adaptation processing capability in mainstream stream processing systems, poor engineering implementability of specialized tools, and the inherent difficulty in balancing real-time performance and classification accuracy—this paper designs and implements a Dynamic Adaptive Concept Drift Processing System …
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Lizhuang Sun, Weihan Zhang, Zhangrui Yang, Yichao Tang
Abstract.Three-dimensional catheter shape reconstruction is of considerable significance for minimally invasive cardiovascular navigation. This paper proposes a compact optical sensing scheme based on Fiber Bragg Gratings embedded in a NiTi-supported catheter structure. By combining strain-derived curvature estimation with Frenet-frame integration, the proposed method enables reconstruction of the catheter centerline from measured wavelength variations. The sensing structure is designed for improved compatibility with interventional catheter systems while maintaining a compact form factor. Static tests …
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Xiaozhen Luo, Zhiqiang Huang, Gang Li
Abstract.Aiming at the problems of low vibration energy down-transmission rate and poor quality of excitation signals of the BV500 seismic vibrator in cement road operation, this paper proposes a new multi-objective optimization strategy based on the synergy of topology optimization (TO) and response surface optimization (RSM), which aims to reduce the mass of the flat plate and improve the stiffness of the flat plate. Topology Optimization allocates the plate material to innovatively design an octagonal I-beam plate, while Response Surface Methodology further corrects and optimizes the structural …
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Haifeng Ma, Taiyu Chen, Xinxin Yan
Abstract.Focusing on the issue of severe viscosity loss in the flow control valve, a core component of polymer flooding for enhanced oil recovery, this study takes the layered polymer injection flow control valve as the research object. A numerical simulation and structural optimization based on low shear rate conditions were conducted, and experiments were performed to verify the feasibility of the optimized design. Using the control variable method, numerical simulations were carried out on different valve spool structures, slot spacing, slot depth, and valve stem length. The results demonstrate that …
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Haojie Liao, Xia He, Peng Wang, Chuan Wang
Abstract.To address the limitations of conventional technical solutions in surface testing operations for natural gas wells, this study identifies the deficiencies associated with the manual control of gas-liquid separators. A precision pressure control system for surface testing is investigated, integrated with virtual sensing (observation) and Nonlinear Model Predictive Control (NMPC). The mathematical model of a gravity-based gas-liquid separator is introduced, and a virtual observation method based on the Kalman filter is explored. Building upon these foundations, an intelligent control strategy …
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Boya Wu, Benjie Li, Yiqin Xiong
Abstract.In the mid-to-late production stages of low-pressure gas wells, wellbore liquid loading becomes a prominent issue. Traditional manual foam drainage agent injection suffers from inaccuracies in timing, agent waste, and high labor intensity. This paper presents the design of an intelligent foam drainage system integrated with UAV-based automatic agent replenishment, achieving core functions such as automatic precise injection, closed-loop control of concentration and flow rate, remote monitoring, and unmanned UAV agent replenishment. The equipment adopts a skid-mounted integrated structure and …
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Zhenqiang Kang, Liang Zhang, Xin Chen
Abstract.Atomizing a liquid solvent into micron-sized droplets can significantly increase the specific contact area between the gas phase and the liquid phase. This paper employs CFD methods to investigate the atomization performance of a tubular natural gas atomizer and analyzes the effects of four different gas flow velocities (18 m/s–23 m/s) on the atomization efficiency. The results indicate that the use of a Venturi channel structure, where peak gas velocities in the throat region exceed 90–110 m/s, effectively breaks the liquid into small droplets. In the high-frequency pulsation transition zone …
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Junfei Liao, Xiaohu Wang
Abstract.To address the critical safety risks of high-speed rotor drop and subsequent rub-impact following the failure of active magnetic bearings (AMBs) in aero-engines, this paper establishes a nonlinear dynamic model for a flexible AMB rotor-protective bearing system that fully couples maneuvering flight loads. The rotor model is constructed based on the Timoshenko beam theory and the finite element method (FEM). By incorporating the Hunt-Crossley nonlinear contact model and the multidimensional maneuvering additional inertial force field, the transient dynamic equations of the system are solved …
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Yong Zhang
Abstract.Pingdingshan Tian'an Coal Industry Co., Ltd. No.13 Mine is a typical coal and gas outburst mine, and gas disaster control is crucial to its safe and efficient production as well as sustainable development. Based on the mine's mining intensity assessment and production capacity confirmation report, this paper systematically and in-depth analyzes the characteristics of gas occurrence, gas control technology system, configuration of gas extraction system and current status of management and operation in the mine. The research shows that Pingmei No.13 Mine has established a three-dimensional …
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Yong Diao
Abstract.To address the challenge of early warning for coal and gas outburst disasters, taking Shanxi Xinjing Mine as the research context and based on the statistical analysis of 209 gas dynamic phenomena in the mine, an early warning indicator system covering three dimensions—production system, region and working face—was constructed. A multi-source information fusion early warning model based on association rules and evidence theory was developed, integrating four core modules: monitoring and data collection, professional analysis, early warning dissemination, and database management. This …
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Quancheng Dong, Faguang Jiang, Kebing Cheng
Abstract.Aiming at the low accuracy and poor stability of manual docking for 5-axis LNG loading arms, this paper focuses on its kinematic modeling and docking trajectory planning optimization. First, the hydraulic-driven LNG loading arm was simplified into a 5-joint robotic arm model with a virtual joint, and its kinematic model was established based on the Modified Denavit-Hartenberg (M-DH) method. A D-H parameter table was constructed, and the safe rotation range of each joint was defined via motion interference analysis. Considering the large mass-span ratio of the LNG loading arm, joint space …
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Xinyang Li, Mingjiang Shi
Abstract.Pulsed Eddy Current (PEC) testing is a vital non-destructive technique for assessing corrosion in oil casings, yet its practical application is often hindered by severe interference from lift-off variations and limited detection sensitivity in complex downhole environments. To address these challenges, this study proposes an optimized differential PEC probe system integrated with high-permeability Ni-Zn ferrite cores. A three-dimensional transient magnetic field model was established to investigate the detection mechanism and optimize key structural parameters. Simulation results demonstrate …
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Hao Wang, Zhewei Ye, Bing Liu, Changjiang Li
Abstract.The paper addresses the conditions of oil and gas wells with high sand content, low formation pressure coefficients, and high loss rates, where existing sand removal methods are inefficient. A novel sand-bailing device that is both fast and efficient has been designed. Its innovation lies in the design of a separation hood structure for sand and water separation within the cylinder, which enables direct and rapid sand removal. This paper investigates the various parameters affecting the separation efficiency of the novel sand-bailing device under transient conditions using computational fluid …
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Gaoneng Wei, Mingjiang Shi
Abstract.To address the difficulty of quantitatively evaluating early-stage damage in in-service metallic pipelines, this study establishes a three-dimensional transient finite element model of a pipeline based on the low-dispersion L(0,2) ultrasonic guided-wave mode excited at 70 kHz. The effects of circumferential damage size, depth, and axial length on echo characteristics are investigated in detail. The results show that, with the damage position kept constant, both the damage echo amplitude and the reflection coefficient increase significantly with the growth of circumferential coverage, while the …
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Lin Tao, Guowei Zhu, Rongbin Xie, Zhuo Chen, Guangda Xu
Abstract.In petroleum drilling engineering, the drill bit is the primary rock-breaking tool, and its performance directly affects drilling cost and operational efficiency. As oil and gas exploration and development extend from shallow formations to deep and ultra-deep reservoirs as well as increasingly complex geological environments, challenges such as high rock hardness, strong abrasiveness, and poor drillability significantly increase the difficulty of rock breaking, placing higher demands on drill bit structural design and service reliability. The PDC–roller-cone hybrid drill bit combines the …
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Xiwen Chen, Bin Li, Fusheng Yu
Abstract.The Yingxiongling Area of Qinghai Oilfield is rich in shale oil resources; however, there are still gaps in the analysis of reservoir geological characteristics and the fracturability evaluation system in this region. To address this, a fracturability evaluation model was established through systematic experiments on reservoir engineering geological characteristics, with the results as follows: The reservoir in the Upper Member of Ganchaigou Formation is prominently characterized by interbedded sedimentation of calcareous shale and calcitic dolomite, with an average porosity of 5.7%. The pore …
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Hua Qiu
Abstract.To enhance the resilience and coverage of urban charging infrastructure networks, this study investigates the site selection and capacity optimization problem for new energy charging stations by considering factors such as point-based demand, flow-based demand, capacity constraints, road network resilience, and disruptive events. A dual-objective 0-1 integer linear programming model was developed to describe the problem. The multi-objective problem was transformed into a single-objective problem using epsilon constraints and solved using the commercial solver Gurobi. The results indicate that: …
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Teng Wang
Abstract.When oil contamination occurs in a loess layer, the high porosity of the loess causes rapid signal attenuation. Abnormal dielectric properties produce complex reflected signals, while vertical joints and fissures generate multiple reflections, making it difficult to resolve the details of oil contamination as clearly as in ordinary soils. To clarify the imaging characteristics of leakage from buried oil pipelines in loess, a physical model of buried pipelines under different leakage conditions was established. GprMax was used to simulate multiple leakage scenarios under practical operating …
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