bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on sedimentation characteristics of the end bend water extraction project of cascade reservoir backwater
Authors: He Chuankai 
Published: October 2024

Abstract
The operation mode of upstream and downstream cascade power stations significantly impacts the river bed in the water intake section, leading to complex sediment deposition characteristics in the curved river section at the reservoir’s end. In this research, a standard physical model for bed load and suspended load at a scale of λl=λh=100 was conducted, combined with the operation mode of upstream and downstream power stations, to investigate the sediment deposition patterns in the intake section and to study the sediment deposition characteristics in the intake area. The experimental results reveal that bed load sediment predominantly accumulates on the right bank (convex bank) of the river, with no bed load sediment accumulation at the mushroom head layout of the water intake project on the left bank (concave bank). When the operation of upstream and downstream power stations is uncoordinated, suspended sediment settles in the water intake section, with no sediment accumulation in the local area of the mushroom head of the intake due to the disturbance effect. Safety sensitivity analysis indicates that the safety of the water intake project can be ensured.
Research on numerical prediction of hydrodynamic interference under coupling of pod propeller and hull
Authors: Yao Zhenqiu , Zhao Yutao , Ling Hongjie 
Published: October 2024

Abstract
Taking the cable-laying ship and the pod propeller as the research objects, based on the Reynolds time-averaged RANS equation and sliding moving grid technology, the self-propulsion numerical calculation of the coupling of the pod propeller and the hull was completed. By comparing the resistance of the bare hull and the thrust of the pod propeller, the hydrodynamic interference under the coupling state of the pod propeller and the hull is analyzed. The results show that when Fr=0.295, the total resistance of the ship increases by 21.6%, the pressure difference resistance increases by 30.5%, the wake fraction is 0.011, and the thrust derating is 0.178. The research results provide theoretical and technical guidance on the interference problem between the hull and the pod propeller.
Hydrodynamic performance on cavity resonant type floating breakwater for long waves
Authors: Gui Bin , Ji Chunyan , Li Zhifu , Bian Xiangqian 
Published: October 2024

Abstract
The current work investigates a cavity resonant-type floating breakwater (FB). Therefore, the Helmholtz resonator principle was adopted to reduce the intensity of long-period waves effectively. The configuration of the internal cavity was optimized to resonate with the fluid inside the cavity, thereby dissipating wave energy. Five models with different gap distances (GDs) were analyzed. Various experiments compared the traditional box-type floating breakwater performance with modified floating breakwater models. The experiments were focused on evaluating the transmission coefficient of stationary models under various wave heights and periods. According to the results, the optimized wave attenuation mechanism can effectively overcome the technical defects of the conventional floating breakwater, which limits its application for long-period wave attenuation. Meanwhile, it is found that for a given principal size, the proposed floating breakwater exhibits a 20%-30% smaller transmission coefficient relative to the traditional box-type FB in medium and long-period waves.
Research on design method of aircraft reserve fuel tank to improve hydrodynamic performance
Authors: Jiang Ting , Shi Sheng-zhe , Wu Bin , Huang Miao , Wang Fan 
Published: October 2024

Abstract
To improve the water surface floating ability of helicopters and reduce their dependence on emergency buoys, this paper proposes a reserve fuel tank scheme design based on the “dual resonance” principle of fuel tank and fuel movement. The aim is to reduce the floating response amplitude of helicopters by changing a series of variables, such as the main scale of the fuel tank, the total amount of fuel, and the installation position. The influence of different variables on helicopter roll motion was studied by comparing the amplitude response operator variation curves of helicopters under 11 fuel tank parameters. The anti-roll design method of reserve fuel tanks was mastered. The results show that the key parameters affecting helicopter roll motion are the vertical position and cross-sectional area of the fuel tank. Based on the optimization of the main parameters and installation position of the fuel tank proposed in this paper, the fuel tank can reduce the maximum amplitude response of the helicopter by about 12.3%.
Micro-scale flow simulation study of low-yield wells in tight gas reservoirs
Authors: Yan Ruifeng , Zhang Yueqi , Meng Wanying , Sun Dong , Luo Dalong , Ding Wei 
Published: October 2024

Abstract
The mechanism of gas-water flow in reservoirs has traditionally been characterized macroscopically based on flow experiments, but the microscopic mechanisms of gas-water flow in porous media cannot be precisely described experimentally. This paper categorizes low-yield gas wells into Types I, II, and III. With microscopic visualization principles, three different types of core thin-section photos were selected to construct a pore structure model, allowing for micro-scale flow simulation to examine micro-scale percolation patterns in various types of low-yield gas well reservoirs. The results show that there is a shorter displacement time in Type I reservoirs compared to Type II and III reservoirs which exhibit more pronounced fingering phenomena.
Floating body motion coupling study and economic evaluation of different floating photovoltaic arrangement schemes under hybrid solar-wind power generation
Authors: Lin Feiyan , Li Na 
Published: October 2024

Abstract
Reducing the number of anchor points and moorings for floating platforms is one of the ways to reduce the integration and maintenance costs of floating offshore wind and solar farms. This paper focuses on the technical feasibility and economic viability of reducing the number of anchor points and moorings for floating offshore PV platforms by using a monopile of a stationary wind turbine as a mooring anchor point and introducing a shared line system. In this paper, three different floating solar layouts and their corresponding mooring systems are numerically evaluated and optimized under different environmental loading conditions using the commercial software OrcaFlex. The results of the study show that the implementation of a shared mooring solution maximizes the cost-effectiveness economically while technically ensuring stable operation.
Study on the dynamic characteristics of rising bubbles under the influence of viscosity based on VOF method
Authors: Qin Zikai , Li Mingyuan , Chen Xin , Cui Jie 
Published: October 2024

Abstract
In order to study the buoyancy-driven rising bubbles in liquids in various types of problems such as oil pipeline transportation, combustible ice mining, ship drag reduction, and the use of bubbles to deliver drugs in blood, this paper establishes a model for the rising bubbles in liquids based on the Volume of Fluid Function (VOF) method, and investigates the change rule of the larger-size bubbles under the influence of viscosity in different viscous silicone oils. It provides theoretical and technical support for various natural and industrial processes such as deep-sea oil extraction and metal smelting.
Flow prediction analysis of shutdown and restart for off-station pipeline based on flow assurance and energy-saving
Authors: Wang Han , Feng Yu , Tong Lining , Cui Zhaoxue , Yin Ran , Huo Fuyong 
Published: October 2024

Abstract
Due to unforeseen operation errors or natural disasters, off-station pipelines may undergo emergency shutdown operations, necessitating a focus on flow assurance during the shutdown and restart process. Moreover, energy saving and emission reduction have become the focal points in the transformation of oilfield enterprises. This paper formulates a method for predicting the flow status during shutdown and restart of off-station pipelines based on the liquid conservation law, and the characteristic equations are solved by the characteristic line method. A comparative analysis is conducted on the operation rules of shutdown and restart for oil-water mixing transportation and dewatering processes under different water cuts. A typical off-station pipeline in a transfer station is selected as the case study object. The results indicate that due to the lower station heating required for the oil-water mixing transportation process, this process saves 44.3% of costs compared to the dewatering process. As the water cut increases, operation costs decrease and then increase, with the total cost of the 50% water cut scheme being the most economical. This study provides a reference for the safe operation and energy-saving management of off-station pipelines in the future.
Research on the response of underwater explosion liquid tank structure based on RKPM method
Authors: Zhao Dewei , Zhao Chuanqi , Chen Xin 
Published: October 2024

Abstract
This work establishes a three-dimensional fluid-structure coupling calculation model for the response of SPH-RKPM underwater explosion structures and verifies its effectiveness. Using the established numerical model, the dynamic response of the water-containing liquid tank structure under underwater explosion shock wave load was modeled and calculated, and the response characteristics of the water-containing liquid tank under different detonation distances were discussed. The response law of the water-containing liquid tank structure under shock wave load is summarized.
Numerical simulation of granular heat transfer within lifter rotating drum using smoothed particle hydrodynamics (SPH)
Authors: Ding Liangrui , Tong Zhenbo 
Published: October 2024

Abstract
The rotating drums are typical industrial thermal processing equipment, which is widely used to heat or cool material particles in the circle fluid bed (CFB) systems. The traditional cylindrical rotating drum cannot significantly promote the heat transfer process of granules in operation, largely limiting further application. In this research, using smoothed particle hydrodynamics (SPH), two different types of lifters are employed to investigate the effects of shape, size, and number of lifters on the coefficient of heat transfer within the rotating drums by combining the flow and mixing characteristics of particles, the stress distribution, the transient velocity and temperature distribution, and the trend of the Peclet number.
Optimal operation of multi-energy microgrids with shared energy storage clusters by master-slave games
Authors: Ji Xiu , Bai Yang , Zhang Haifeng , Han Huanhuan , Zhang Jiajun 
Published: October 2024

Abstract
As shared energy storage power plants have become a research hotspot, the cooperation between them and microgrids has attracted attention. In this paper, we propose a master-slave game optimization operation strategy for multi-energy microgrids, taking into account shared energy storage (ESS) clusters. Firstly, the inclusion of ESS clusters is considered in a combined heat and power (CHP) type multi-energy microgrid. Then, the optimal operation model is established and solved in two layers. The master-slave game model in the context of ESS clusters is proposed by analyzing the game relationship between the microgrid side and the user side, the arithmetic simulation with MATLAB, and the modeling and solving are carried out by the Yalmip tool and the CPLEX solver, and the combination of heuristic algorithms and the solver is used to optimize the strategies of the microgrid side and the user side. The optimization of the system after the optimization of this paper’s methodology can enhance the system economy.
Research on damage identification of wind power tower structure based on deformation and vibration dual parameter analysis
Authors: Ye Hairui , Zhao Yijuan 
Published: October 2024

Abstract
During the operation of the wind turbine, the force on the wind turbine tower is mainly caused by the vibration source at the top. As a high-rise structure with a large span, traditional vibration mechanics is used to analyze the overall force on the tower body, but the analysis of vibration modes or modes is slightly insufficient. This article adopts the analysis method of elastic wave dynamics to identify damage to the structure of wind power towers based on deformation and vibration dual parameter analysis. This article analyzes the propagation characteristics of elastic waves in tower structures, concrete bases, and foundation parts when damaged. This article develops a remote online monitoring and early warning platform for wind power tower bodies based on the attenuation properties of elastic waves. This article monitors the vibration and inclination of the tower drums of 5 wind turbines (# 13, # 31, # 34, # 49, and # 52). The tower drums have not undergone irreversible tilting or torsional deformation. However, through vibration analysis, it is suggested to check whether there is crushing between the tower drums and the concrete base, as well as whether there are local cracks on the surface of the concrete base. There may be local damage to the foundation ring of tower #31. It is recommended to check for local cracks in the foundation ring. This ensures the safe operation of wind power towers and has certain practical application value.
Experimental study on fluid-Induced vibration caused by backward erosion piping based on acoustic emission
Authors: Guo Hengle , Ren Jie 
Published: October 2024

Abstract
Double-layer dike foundation is one of the most common stratum types with the highest probability of catastrophic failure in dike engineering, and the most important danger is backward erosion piping. The occurrence and development of piping need to be monitored by reliable technology. Therefore, the influence of different piping outlet forms on acoustic emission monitoring is explored by using a self-designed test device. The results show that the overall evolution process of ringing count and accumulated energy can be divided into two stages according to the time of piping. In the first and middle stages, the particle collision is caused by sand boiling at the outlet, and the measured value is small. In the later stage, piping channels appear, particle migration occurs, and the measured value is large. Moreover, the maximum impact value decreases with the increase of the piping outlet, and the cumulative energy growth rate of the three groups of tests in the early stage is the same, while the head difference required for the rapid growth stage is inversely proportional to the piping outlet.
Resistance calculation and analysis of underwater vehicle-manipulator systems
Authors: Zhu Yazhou , Wang Zhenyu , Sun Rui , Yang Kun , Qiao Yilin 
Published: October 2024

Abstract
This article takes the underwater vehicle-manipulator systems (UVMS) composed of an autonomous underwater vehicle and a mechanical arm as the research object. STAR CCM+ software is used to perform hydrodynamic simulation on it. Its suitable navigation postures are verified. The resistance of UVMS is calculated and velocity cloud maps are generated. A comparison was made between the resistance experienced by the UVMS system during direct navigation and simulated operations, verifying that the resistance is related to the velocity and attitude of the UVMS, and proving that this study has important reference significance for the study of the hydrodynamic performance of the UVMS.
A method for ocean front enhancement and automatic detection of SAR data
Authors: Yuan Liming , Xu Suqin , Jia Dianji , Chi Zonghao , Wang Zihao 
Published: October 2024

Abstract
The study on enhancing the radial resolution of SAR images and automatically detecting ocean fronts based on the gradient of backward scattering coefficient (sigma0) can significantly enhance the application potential of SAR satellite systems. In this paper, we qualitatively and quantitatively analyze the impact of radiometric resolution enhancement using data acquired by China’s Gaofen-3 SAR satellite from two different views: southwest and southeast Taiwan Island. The combination of 5*5 Enlee filtering and 10*10 multi-view processing is found to be more effective than separate filtering and multi-viewing, achieving a reduction in STD of over 20% and an increase in ENL of over 85%. Additionally, we automatically detect and characterize ocean fronts using their distinctive parameters. Moreover, the angle between the two fronts and the corresponding nearest near-surface wind field exceeds 23°. However, both align well with the temperature gradient, indicating that they are temperature fronts rather than wind field shear. These findings provide valuable insights for designing China’s SAR satellites and understanding marine environments.
UAV forest fire detection based on CNN and InceptionV3
Authors: Lu Shengbo 
Published: October 2024

Abstract
Forest fires have created a severe hazard in our ecological environment with abrasive climate change all over the world. What is even more concerning, the frequency of forest fires is increasing year by year. By far, a great number of methodologies, such as satellite systems, IR, and WSN, have been created to resolve this rigorous problem. However, most of these detection methods are costly and structurally complex, making them difficult to quickly learn and use, thus not effectively reducing personnel and property injuries. Our research proposed using UAVs (Unmanned Aerial Vehicles) as visual detection carriers and using InceptionV3 for visual processing of aerial images. The flame dataset from IEEE Dataport, containing 63178 JPEG pictures, is used in our research. Our proposed forest fire detection methodology using Convolutional Neural Network (CNN) and InceptionV3 achieved a remarkable 89.90% validation accuracy. Moreover, our methodology gained an ideal precision and recall ratio.
Detecting multiclass objects in remote sensing imagery: A deep learning approach
Authors: Büyükkanber Furkan , Yanalak Mustafa , Musaoğlu Nebiye 
Published: October 2024

Abstract
Object detection from remote sensing imagery is crucial in fields including monitoring agriculture, efficient urban planning, environmental conservation, and disaster response. It enables informed decision-making by identifying and tracking objects such as crops, infrastructure, and environmental changes, contributing to optimized re-source management and rapid response in various domains. Multiclass object detection benefits from the transformative power of deep learning, surpassing traditional methods in accuracy and efficiency. This research investigates the effects of data augmentation techniques and diverse hyperparameters on the training process of a single-stage YOLOv5 deep learning algorithm applied to the selected DIOR remote sensing dataset for multiclass object detection practices, resulting in 0.628 mAP score among the applied experiments.
Tropospheric delay estimation and influencing factors analysis of GNSS multi-system
Authors: Zhang Jingfa , Guo Jinhai , Yin Jiao , Song Zhenkang , Mu Daocheng 
Published: October 2024

Abstract
In this paper, the tropospheric delay parameters are estimated by GNSS regional network solution, and the different factors affecting the estimation of tropospheric delay parameters are analyzed experimentally. The high-precision tropospheric delay correction file (.ztd) provided by IGS and the traditional model estimation of the GNSS regional network are compared to verify the final positioning accuracy. The main factors affecting the estimation of tropospheric delay parameters and the conditions conducive to the estimation of tropospheric delay parameters in the data solution process are obtained. The experimental results show that: (1) GPS has the highest tropospheric delay estimation accuracy in the European region, Galileo is slightly worse than GPS, and BDS has the lowest tropospheric delay estimation accuracy; (2) The tropospheric delay estimation accuracy of post-product in different satellite precision products is better than that of real-time products, and CLKM2 is better than CLK93 in real-time products. With the increase of satellite systems, the accuracy of tropospheric delay estimation is gradually improved. Compared with the GPS single system, the accuracy of the GPS+ Galileo+BDS triple system is improved by about 7.2%, 7.2%, and 7.5%; (3) The tropospheric delay estimation accuracy of the European region is better than that of the Australian region; (4) Based on the BDS whole system data solution, the high-precision tropospheric delay correction file (.ztd ) has better positioning accuracy, and the tropospheric delay estimated by the GNSS observation data through the traditional Saastamoninen model of the regional network can also meet the current high-precision positioning requirements in terms of positioning accuracy. The horizontal direction is better than 2 cm, and the elevation direction is better than 4 cm.
Risk assessment of continued airworthiness event of transport aircraft rudder pedal strut damage
Authors: Qiao Yu , Lu Jun 
Published: October 2024

Abstract
To ensure the safe operation of aircraft after delivery, a set of continued airworthiness risk assessment processes and methods for transport aircraft is studied and proposed, including unsafe condition identification, consequence severity determination, occurrence possibility assessment, risk level determination, and reaction time calculation. The continued airworthiness risk matrix is established. Based on the established process and method, the risk assessment is carried out for the continued airworthiness event of transport aircraft rudder pedal strut damage. The relationship between the risk level of the fleet aircraft and the flight duration is determined, and the reaction time of the unsafe condition of the aircraft in each flight duration is calculated. The results show that the process and method are feasible.
Analytical solution for the skip trajectory of hypersonic vehicles with time-varying aerodynamic coefficients
Authors: Yu Zhaowei , Chen Wanchun , Yu Wenbin 
Published: October 2024

Abstract
An analytical method is proposed for calculating the altitude and flight path angle of hypersonic vehicles’ skip trajectories under the influence of arbitrary time-varying aerodynamic coefficients. First, a longitudinal plane dynamics equation is established based on the inertial Earth model and the specific kinetic energy is introduced as independent variable to simplify the derivation. Subsequently, the solution is obtained through the perturbation method, where the zero-order analytical solution is based on existing literature, and the first-order linear time-varying system is decoupled through matrix linear transformation. Finally, by comparing numerical integration and analytical solutions with constant aerodynamic coefficients, the precision of this method in dealing with time-varying aerodynamic coefficients is verified, demonstrating its advantages over analytical solutions with constant aerodynamic coefficients.