bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on the hydraulic response characteristics during the water conveyance process of water diversion projects
Authors: Hu Hui , Liu Guoping , Tao Lei 
Published: October 2024

Abstract
During the initial trial period, the Hanjiang-to-Weihe River Valley Water Diversion Project (HWRVWD) sourced water from the Sanhekou water conservancy junction. It then transferred water through the Qinling water conveyance tunnel and distributed it at the Huangchigou water distribution hub, ultimately transporting it to the Guanzhong area. The hydraulic simulation and real-time control of the water conveyance system play a crucial role in ensuring the safe and efficient operation of this engineering project. To maintain water transfer safety and reasonable scheduling during the water supply process, the hydraulic characteristics of the transient process were calculated and analyzed in this paper. The one-dimension (1D) hydrodynamic mathematical model and advection-dispersion model were established to calculate the hydraulic factors of the 81.78 km Qinling water conveyance tunnel and the Huangchigou water distribution hub within the HWRVWD. Validation results showed that the root mean squared error tended toward zero and the coefficient of determination exceeded 0.97 between the measured values and the simulated values. The opening of gates and upstream inflow directly affected water level variations and storage. Smaller gate openings led to increased water level amplitudes before the gate and faster reaching of maximum water levels, but it also led to opposite trends in flow rates behind the gate compared to upstream water levels. The impact of incoming water flow rates on flow variations at different channel sections was significant. The time for water heads to reach each section and the rate of flow variation positively correlated with incoming water flow rates. Gradual increases in upstream inflow resulted in progressively larger water level amplitudes both before and behind the gate, with an increased maximum value, but more water might be discarded. When the water demand changes, the primary focus is on controlling the upstream inflow, with gate opening adjustments as a secondary measure, to achieve the goal of minimizing or eliminating water wastage.
Simulation analysis and hydrodynamic performance optimization of small MHD thruster based on improved I-bridge structure
Authors: Zhang Xinyu , Zhao Junyi , Chen Gong , Wu Boqian , Du Yibo 
Published: October 2024

Abstract
Magnetic hydrodynamic drive (MHD) generates thrust by the coupling interaction of three fields: flow field-electric field-magnetic field. Because this propulsion method has no propeller or mechanical structure, it has the advantages of quiet, simple structure, easy operation, flexible layout, and difficult to detect. This is the current research hot spot. In order to meet the needs of miniaturized silent propulsion, this paper selects a linear internal magnetic thruster for research and analysis and improves the design of an I-shaped magnetic bridge structure. Firstly, the thrust and efficiency of the thruster under ideal conditions are calculated, and the thruster model is established. The conclusion is that the I-shaped magnetic bridge can increase the magnetic field intensity of the channel and significantly improve the MHD propulsion efficiency. At the same time, it is found that MHD thruster can reduce noise during operation, but the current required for propulsion is large, and seawater electrolysis will occur, which has a certain impact on the environment. Finally, the problems of small direct drive MHD propulsion are analyzed, and the future development direction of MHD propulsion is prospected.
Numerical simulation study of acoustic source characteristics of liquid level monitor based on infrasound waves
Authors: Wu Xinyuan , Xu Jiaoyun , Li Ning 
Published: October 2024

Abstract
To investigate the sound source characteristics of infrasound waves generated during the operation of the gas explosion liquid level monitoring instrument, with a focus on the aerodynamic noise produced by the monitoring device, a mixed numerical method was used to simulate and study the impact of different nozzle diameters, gas explosion pressures, and casing pressures on the instrument’s infrasound frequency range. The results indicate that gas explosion pressure, casing pressure, and nozzle diameter primarily affect the spectral characteristics within the 10 Hz to 20 Hz range. As the gas explosion pressure and nozzle diameter increase, the sound pressure level in the internal sound field also increases, and the peak frequency shifts higher. Conversely, with an increase in casing pressure, the sound pressure level in the internal sound field decreases, and the peak frequency shifts lower. The research findings can provide a theoretical basis for the development of the instrument.
Variable target water level control method in front of sluice in flood storage area based on storage balance model
Authors: Xu Xiaoyou 
Published: October 2024

Abstract
To prevent the increase in flood disaster frequency, scale, and impact degree, a flood control engineering system with flood storage and detention areas, embankments, and reservoirs as the main body has been formed. Flood storage area is the key to the flood control engineering system, and its water level control performance is directly related to the success of flood control. According to the actual situation, the flood evolution simulation model in the flood storage area is constructed to obtain the evolution information of any unit of flood in the flood storage area. The dynamic control judgment coefficient of the water level is calculated, and the dynamic control program of the variable target water level in front of the sluice is formulated. Water level control can be realized by executing the established procedures. The above experimental data show that the proposed method can effectively control the water level in the flood storage area within the range of 26.03m ∼ 29.12m, and the minimum value of the corresponding risk rate is 3%, which fully proves that the proposed method has better dynamic control effect on the variable target water level in front of the sluice.
Great lakes basin model based on physical flow and Data-Driven
Authors: Huang Yijing , Yang Shijia , Liu Anqi 
Published: October 2024

Abstract
As a group of freshwater lakes, the Great Lakes span the United States and Canada and have a great impact on the economies and environments of the regions. To meet the needs of various stakeholders, it is significant to regulate the flow through the control mechanism to achieve the optimal water level balance. Combined Physical Process and Data-Driven, this paper established a dynamic model of the Great Lakes based on the lake dependence relationship and complex climate factors. After judging the optimal water level by combining the needs of all stakeholders, the hydrodynamic model is run to verify and predict the water level, and the flow control algorithm is obtained. The results show that the prediction of optimal water level has a high accuracy rate. After the flow control, the error between the predicted and optimal water levels is greatly reduced.
Research on the response of underwater explosion side structure based on RKPM method
Authors: Zhao Chuanqi , Chen Xin , Cui Jie 
Published: October 2024

Abstract
Based on smoothed particle hydrodynamics and reproducing kernel particle method, this paper establishes a fluid-structure interaction three-dimensional calculation model for the dynamic response of complex structures to underwater explosion shockwave, verifies the effectiveness, accuracy and progressiveness of SPH-RKPM coupling calculation, and establishes a control condition with detonation distance as a variable to determine the dynamic response characteristics of ship side under shockwave loads generated by underwater explosion at different detonation distances.
Inverse algorithm for boundary heat flux density based on the NARX neural network
Authors: Deng Liang , Li Haidong , Wang Youtong , Chen Changxu , Pan Zhenhai 
Published: October 2024

Abstract
The inverse heat transfer problem is vital for scientific research and engineering applications. This paper introduces a method using the Nonlinear Autoregressive with Exogenous Inputs (NARX) neural network to identify heat boundary conditions in nonlinear transient heat transfer processes in real time. This method has two notable advantages: (1) It relies solely on surface temperature time series to obtain inversion results; (2) Even in the absence of knowledge regarding the system’s state equations, it can estimate heat flux density. The NARX neural network is trained by using Bayesian regularization with surface temperature and heat flux data. (3) As per the inversion results, the NARX neural network’s accuracy in predicting the boundary heat flux density (BHFD) increases as the temperature measurement points approach the heat flux boundary. This neural network calculates the current heat flux density by incorporating both present and past surface temperature measurements as inputs. Through numerical simulation experiments, the efficacy of the NARX method is confirmed, showcasing its exceptional accuracy, robustness against noise, and broad suitability.
Separate prediction of underwater noise from drain pipes base on Vibration-acoustic coupling method
Authors: Qi Qiongfang , Peng Xianyong , Jiang Shiliang , Li Guangming 
Published: October 2024

Abstract
Since drain pipes on ships radiate underwater noise when in use, the components and radiation characteristics of flow noise and flow-induced noise from drain pipes on ships are explored, and the relationship between peak spectral values and wet mode frequencies is analyzed. The numerical calculation models of the flow field and structure for drain pipes are created respectively to obtain pulsating pressures in the flow field and structural mode values. Then, the flow noise and flow-induced noise are separately measured in an acoustic model developed for drain pipes upon the mapping of wall fluid meshes, structural meshes and acoustic meshes. A vibration-acoustic coupling model with the radiated sound field nephogram is presented based on the wall pulsating pressure and structural mode values. The numerical calculation indicated a significantly louder flow noise from drain pipes than the negligible flow-induced noise. The resulting wet mode of drain pipes solved by the Boundary Element Method (BEM) reflects the similarity between the peak spectral value and the wet mode frequency of flow-induced noise, marking that the fluid pulsating pressure excites noise.
Numerical simulation and analysis of motion responses and added resistance of a KRISO container ship in regular waves
Authors: Yang Xinglin , Wu Shaohui , Du Xin 
Published: October 2024

Abstract
In order to explore the influence of vessel speed on seakeeping characteristics and provide valuable insights for ship performance evaluation, the accurate prediction of ship motion and resistance in wave conditions is essential. In this study, the variations in ship motion and resistance with respect to ship speed are analyzed during navigation in regular waves. The results suggest that the added resistance coefficient of the KCS demonstrates an initial rise, succeeded by a subsequent decline, with the expansion of wavelength. Moreover, the peak non-dimensional resistance coefficient, observed at different ship speeds, demonstrates an upward trend with the augmentation of ship velocity. This research methodology provides a valuable tool for numerically predicting the hydrodynamic performance of vessels in regular wave conditions.
Study on seawall deformation analysis based on seawall inner foundation pit excavation
Authors: Zhao Yun , Liao Tingting , Liu Xingle , Jin Qianqian 
Published: October 2024

Abstract
The purpose of this study is to assess the potential effects of excavation activities on the structural deformation of the Shitang seawall in Shandong Province during the treatment of an informal landfill in the Yantou Industrial Area, Jiaojiang. By using nonlinear elastic analysis and Mohr-Coulomb elastic-plastic model, combined with MIDAS GTS NX software, the effects of construction on the seawall are analyzed in detail. The monitoring data show that the deformation caused by the foundation pit construction is in a safe range and will not pose a threat to the safety of the seawall. The corresponding construction period suggestions are put forward to ensure the safety of the project and provide references for similar projects to enhance the safety and reliability of the design.
Aerodynamic design of two-stage centrifugal compressor for vehicle hydrogen fuel cell
Authors: Wang Zhongjun , Zhang Ke 
Published: October 2024

Abstract
The on-board hydrogen fuel cell is a power generation device that converts the chemical energy of hydrogen and oxygen directly into electrical energy. The centrifugal compressor mainly provides oxygen for the cathode of the fuel cell system. With the rapid development of the hydrogen fuel cell industry, the key components of the air compressor field are also developing rapidly. In the technical route, most companies launched two-stage compression centrifugal air compressors in response to the increasing power of the product development trend. The newly developed hydrogen fuel cell system power has reached above 120kW to meet the needs of heavy trucks and other applications. Both the flow rate and pressure ratio of the air compressor are required to increase accordingly. Based on the reduction of parasitic power, the optimal efficiency at the working point of the two-stage centrifugal air compressor is taken as the design goal, from one-dimensional aerodynamic calculation to two-dimensional flow channel design. Finally, the feasibility and accuracy of the aerodynamic design are verified based on key parameters such as pressure ratio, flow rate, and efficiency of the final stage through CFD flow field simulation and test data comparison. The results show that the flow rate is consistent with the calculated flow field, and the maximum error of pressure ratio and efficiency is less than 2%, which meets the target requirements. The research results can provide a research and development basis for designing high-performance centrifugal air compressors for fuel cell vehicles.
Design of experimental section of a water tunnel for simulation of heat dissipation condition of seawater-activated battery
Authors: Tang Qingyan , Dou Zhaoliang , Du Yue , Chen Qianghua , Liu Fengbin 
Published: October 2024

Abstract
A water tunnel is a crucial experimental apparatus in hydrodynamic research, as the traditional water tunnel has drawbacks such as a small cross-sectional area of the test section and higher costs, which makes it difficult to meet the requirements of a water tunnel for simulating the heat dissipation conditions of the seawater-activated battery. This paper proposes a water tunnel specifically designed for simulating the heat dissipation conditions of seawater-activated batteries, and the water tunnel consists of an external cooling water circulation system and an internal electrolyte circulation system. The experimental section’s design determines the water tunnel’s size and key technical indexes. The temperature distribution contour maps of the experimental section were obtained using Ansys Fluent software simulation. The cooling effect was analyzed, and a cooling water flow rate of 10 m/s was selected. Pressure and velocity contour maps were obtained by simulating the experimental section of the water tunnel. The results show that when the cooling water velocity is 10 m/s, the pressure drop of the experimental section is approximately 1.76 atmospheres. The flow field is uniform and stable, and the heat dissipation power can reach 45.5 kW, meeting the technical requirements.
Ship model self-propulsion instrument development and test verification
Authors: Wu Yongshun , Ma Qiang , Xu Wenjun , Xia Wenjing , Yang Sujun 
Published: October 2024

Abstract
Aimed at the characteristics of high precision requirements and large environmental changes of the thrust and torque coupling test in the self-propulsion test of the ship model, the paper carries out the design of the instrument of the ship model test, the calculation of structural strength, the design of anti-jamming of the thrust and torque coupling, and the selection and realization of thrust and torque module. Based on the above, the instrument was calibrated with sensitivity coefficient, high and low temperature, and dynamic stability tests. Besides this, a self-propulsion test at the design speed point of a ship was carried out to verify the accuracy and environmental adaptability. From the static calibration result, the coefficient of determination is 1.0. The max zero drift of thrust and torque is 0.11% FS and 0.05% FS respectively from the low-high temperature test, and the max zero drift of torque under different revolutions is 0.23% FS from the dynamic test. In addition to the above, the max deviation between Maric-SP01 and R31 of thrust and torque is less than 0.78% and 0.65% respectively from the ship model self-propulsion test. So, in one word, the instrument has good reliability and accuracy and can meet the requirements of the ship model self-propulsion test.
Analysis of the response of wind-induced vibrations on flexible photovoltaic mounts
Authors: Wu Sichuan , Wu Haikian , Lou Yibing 
Published: October 2024

Abstract
This article investigates a flexible photovoltaic bracket’s response to wind vibration. A finite element model is established using SAP2000 software for time course analysis. Representative units and nodes were selected to analyze internal force response, displacement response, and acceleration response. The prestress and span change rule of the flexible photovoltaic bracket are also explored, and quantitative research is conducted on the size of prestress and span size. The magnitude of the prestress affects a structure’s responsiveness to wind vibration. As prestress grows, so do deflection and acceleration, and the rate at which axial force is increasing also increases. Conversely, when prestress increases, the rate of deflection reduction falls. Consequently, considering the prestress size, it is advised that 50-kN prestressing be used for the support and wind cables. As the span rises, so do the mid-span span and the axial force of the wind cables, while acceleration also increases. The rate of mid-span deflection increases gradually with the flexible PV mount span, but the rate of axial force increase decreases. It is recommended to limit the span to below 50 m.
Remote sensing image classification based on non-linear enhanced attention mechanism
Authors: Yuan Zhengwu , Chen Qiang , Shao Wen , Yang Zhiwei 
Published: October 2024

Abstract
In recent years, Transformer technology has gradually shown promising applications in the field of computer vision, becoming a research hotspot. However, traditional vision Transformers suffer from significant computational burdens. Although previous studies have attempted to alleviate this issue by reducing the computational load of attention mechanisms, their methods still require improvement. Additionally, past research often overlooked the non-linear representation of values within attention mechanisms, posing another challenge to address. Therefore, this paper proposes a novel attention mechanism aimed at reducing the computational burden of traditional attention mechanisms while enhancing their ability to express non-linearities in values. Furthermore, conventional feedforward neural networks typically output results directly after passing through an activation function, which may limit the model’s representational capacity due to the simplistic structure leading to singular feature information. To address this issue, this study introduces a more robust feature fusion convolutional feedforward network. Through these methods, the aim is to enhance the accuracy of Transformers in the field of remote-sensing image classification.
A star selection strategy based on MDS and fast convex hull algorithm in COSPAS-SARSAT system
Authors: Zhu Xun , Zhao Laiding , Zhang Gengxin 
Published: October 2024

Abstract
The space segment of the current COSPAS-SARSAT system is mainly supported by the Galileo system, and the positioning technology used is generally three-star time-difference positioning. Most of the antennas equipped in the Mission Control Centre (MCC) are not omnidirectional. In the case of Source of Search and Rescue (SAR) in a heavily shaded environment, it is necessary to use the different orbit time-sharing single satellite geolocations using TDOA, and the time-sharing will generate more satellite position data. In order to achieve the higher positioning accuracy of the solution, it is necessary to select the appropriate time and optimal geometrical distribution from the satellite positions. In this paper, we propose a satellite selection strategy based on Multiple Dimensional scaling (MDS) data degradation and a fast convex hull algorithm. The three-dimensional satellite data are downscaled to two-dimensional while maintaining their relative positional relationships, and the two-dimensional convex hull algorithm is used for Geometric Dilution of Precision (GDOP) minimum search star selection. By simulating the satellite position data in different orbits and time-sharing to complete the localization solution, the results show that compared with the traditional satellite selection method, the satellite selection strategy proposed in this paper is able to achieve better localization accuracy in a shorter period of time.
Fixed-wing UAV obstacle avoidance algorithm based on real terrain
Authors: Mao Zhiyun , Mo Li 
Published: October 2024

Abstract
This paper presents an obstacle avoidance algorithm for UAVs based on real terrain constraints. The common obstacle avoidance algorithm often abstracts the obstacle as a sphere or a circle or studies the UAV’s two-dimensional obstacle avoidance on a raster map. With the development of fixed-wing UAVs, UAVs have longer and longer time in the air, longer and longer range, and the low-altitude environment they face is often difficult to simulate with simplified regular shape. Thus, this paper constructs the UAV flight terrain environment using open elevation data and designs an obstacle avoidance algorithm accordingly. When the UAV is tracking the track point, it can better control the UAV to avoid obstacles and fly to the target track point.
Test research of the relation between velocity and heart rate during evacuation under adverse attitude conditions
Authors: Li Guodong , Li Wei , Feng Wenchun , Wu Chang 
Published: October 2024

Abstract
Based on the dynamic cabin emergency evacuation tests environment, emergency evacuation tests under adverse attitude landing conditions are studied. The relation between average velocity and average heart rate under horizontal conditions is achieved by means of fitting test data. The test results show that cabin adverse attitude can both affect the move state and psychology of test members. The change trend of move velocity is different from heart rate change and displays a large difference. Change coefficient correlation with psychology is put forward and the relation with pitch and roll angle is attained by fitting the test data. This coefficient can be used to simulate the scared state at simulation adverse attitude emergency evacuation. The test also demonstrates the behavior of the test member can be analyzed by measuring biological parameters and providing a reference for building or modifying the emergency evacuation simulation model.