bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of functional group of Graphene-based woven filter on the desalination performance
Authors: Huang Ziqi , Liang Lijun 
Published: November 2024

Abstract
Graphene-based braided filter membranes (GWFM) are becoming increasingly crucial in seawater desalination because of their excellent performance, moving from research to practical use and helping to tackle water scarcity. However, the mechanisms associated with GWFMs functionalized by functional groups are unclear. This paper demonstrates that graphene strips are intricately integrated into a filtration membrane characterized by X-functional groups (GWFM-X). Molecular dynamics (MD) simulations are effective for calculating water flux, assessing salt discharge effects, and understanding the physical mechanisms in seawater desalination, making them crucial for optimizing and advancing desalination technology and salt rejection rate of four types of GWFM-X, namely GWFM-1.2nm-COOH, GWFM-1.2nm-NH2, GWFM-1nm-COOH, and GWFM-1nm-NH2, which were designed with different functional groups and nanopore diameters. These results demonstrate the superior performance of GWFM-X in water filtration applications. Salt rejection efficiency of four distinct variants of GWFM-X, namely GWFM-1.2nm-COOH, GWFM-1.2nm-NH2, GWFM-1nm-COOH, and GWFM-1nm-NH2, is designed with different functional groups and nanopore diameters. The test membrane shows exceptional water flux, significantly outperforming current commercial reverse osmosis membranes, with measurements of 30.00±0.49 L cm−2 day−1 MPa−1, 35.41±0.71 L cm−2 day−1 MPa−1, 9.31±0.31 L cm−2 day−1 MPa−1, and 20.66±0.21 L cm−2 day−1 MPa−1, respectively. The free energy profiles of GWFM-X reveal a pronounced disparity in free energy barriers between water molecules and Na+/Cl− ions, with a difference of up to 14.26 kBT. The simulation results show that the seawater desalination system maintains over 75% efficiency at pressures between 10 and 500 MPa, highlighting its effectiveness and versatility. Moreover, advancements in nanofabrication technology are paving the way for new membrane materials that could improve desalination methods and help address water scarcity.
Preparation and performance study of a new solvent-free insulation coating for low-voltage busbar
Authors: Deng Xingyue 
Published: November 2024

Abstract
This study focuses on low-voltage busbar insulation and is committed to developing a new solvent-free insulation coating. A coating formula with specific properties was successfully synthesized by screening and optimizing various raw materials. A comprehensive and in-depth testing and analysis were conducted on the developed coatings’ physical properties, electrical insulation performance, heat resistance, and chemical corrosion resistance. The results show that the new solvent-free insulation coating has excellent heat resistance, corrosion resistance, and mechanical strength while maintaining good insulation performance. Compared with traditional insulation coatings, its solvent-free properties effectively reduce the emission of volatile organic compounds, meeting environmental requirements. This study provides a more efficient, reliable, and environmentally friendly solution for the insulation protection of the low-voltage busbar, which has significant practical application value and broad market prospects.
Material selection and design of intake blades for aircraft engines based on additive manufacturing
Authors: Hou Yibing , Luo Haocheng , Dong Siying 
Published: November 2024

Abstract
The intake blades of aircraft engines are mainly used to capture and guide external air into the engine and are the foundation of engine operation. Their materials and design are related to the performance level and reliability of the entire engine. The “additive” 3D printing manufacturing method has the advantages of high precision, low cost, less material waste, strong design, and a short research and development cycle. This article proposes the use of GH4169 high-temperature alloy as the 3D printing material for the service requirements of aircraft engine intake blades, constructs a 3D printing model, and designs and realizes the 3D printing of engine intake blades.
Experimental and numerical analysis of mechanics and fracture characteristics of engine compressor
Authors: Yu Guifeng , Guo Junfei , Wang Jinlong , Shi Zeyu , Du Fengming , Yang Yuxing 
Published: November 2024

Abstract
Investigating the fatigue failure behavior of compressor fan blades and their materials in aero-engines is a crucial research area. This paper focuses on the compressor fan blades and their constituent materials of aero-engines. Firstly, fluid-structure interaction (FSI) numerical simulations under various rotational speeds are conducted to determine the stress distribution and identify the maximum stress. Secondly, based on the FSI results, fatigue tests on fan blade materials under different stress amplitudes are performed to explore the relationship between load and life, so as to analyze the fracture characteristics under various stress amplitudes. This research has significant implications for ensuring the stable operation of aero-engine fan blades.
Application of PCA-LSTM algorithm in predicting component faults in CNC machining centers
Authors: Wang Shuwei 
Published: November 2024

Abstract
In order to further explore the relationship between component failures and CNC machining center failures, a method of predicting component failures in advance was proposed to reduce the likelihood of machining center failures and improve CNC machining efficiency. In this paper, the principal component analysis method is used to optimize the Long short-term memory neural network to build a network model to study and predict the fault status of NC machining center components in work. The use of Principal Component Analysis (PCA) to extract the main features of machine tool faults can improve the speed of iterative training networks during the machining process and reduce the input dimension and prediction difficulty of LSTM. The extracted data is used as input for the LSTM network. The fault type is output. The comparison of diagnostic results between PCA-LSTM, LSTM, and BP neural networks shows that PCA-LSTM is a high-precision prediction model. The root mean square difference is reduced to 1.572. The predicted error results can effectively reflect the changes that occur in the machining center components with the occurrence of faults. It can be seen that it is feasible to use PCA-LSTM as a tool for predicting the faults of CNC machining center components.
Experimental studies on the exhaust emissions of a n-butanol/diesel dual-fuel HCCI engine under different intake temperature
Authors: Song Jiantong , Zhu Chunhong , Shi Yuanfang , Fu Yiwei 
Published: November 2024

Abstract
To improve the exhaust emissions of n-butanol/diesel blends fueled HCCI engines, the influence of intake temperature (Tin) on the HC, CO, and NO
x
emissions was studied by bench tests on λ of 2.5, engine speed of 1000 r/min under the conditions with the blending ratio of B50 and B90. Experimental results show that the HC and CO decline as Tin rises. At the same Tin, the CO and HC of B90 are lower than B50. When the intake temperature is lower than 150°C, the NO
x
emissions are almost zero.
Numerical study on transonic shock wave buffeting of airfoil
Authors: Hu Zicheng , Zhu Liangchong , Mo Xin , Shen Keming 
Published: November 2024

Abstract
Modern transportation aircraft typically cruise at transonic speeds. However, under a specific combination of incoming flow Mach numbers and angles of attack, periodic self-excited oscillations of shock waves can lead to unsteady aerodynamic loads, causing sustained vibrations in the aircraft, which is known as transonic shock wave buffeting. Buffeting loads significantly impact the fatigue life of the aircraft’s structural materials and its handling performance. In severe cases, it causes structural damage or even leads to flight safety incidents, so we should pay more attention to transonic shock wave buffeting when focusing on aeronautical engineering. This paper employs computational fluid dynamics technology for calculations to solve the Navier-Stokes equations, using the SST k-ω turbulence model to numerically simulate the steady flow field, and further employing the detached eddy simulation (DES) method to study and analyze the buffeting initiation mechanism and flow field characteristics of the NACA0012 airfoil’s transonic unsteady flow. By applying the DES method, the results demonstrate an accurate prediction of the buffeting onset boundary of the airfoil compared to wind tunnel experimental data. The research findings on the initiation mechanism and load characteristics of transonic buffeting provide a theoretical basis for optimizing the aerodynamic performance of aircraft during transonic flight and offer guidance for engineering issues such as buffeting load mitigation.
Overall design and structural finite element analysis of deep-sea mining test device
Authors: Liu Jiancheng , Liu Jiwei , Li Lei , Rong Liangwan , Ma Yong 
Published: November 2024

Abstract
In order to support the experimental research and optimization of the deep-sea mining acquisition device, the overall design of a test device capable of carrying multiple acquisition heads was carried out. The design is divided into three parts: the bearing system of the device, the acquisition system, and the data collection system. It also includes the layout scheme of instruments and equipment such as flowmeter and pressure sensor. The experimental platform of simulation acquisition is constructed. The strength and stiffness of the main structure of each system are analyzed and optimized. The analysis results show that the strength and stiffness of the test device can meet the test requirements. The structural arrangement of the device meets the requirements of the test function, which provides a reference for the application design of similar devices.
Failure analysis on cracking and leakage of 304 stainless steel flange in petrochemical butyl device
Authors: Cheng Lei , Du Chenyang , Li Xiaowei , Liu Baolin , Cui Guoju 
Published: November 2024

Abstract
During the pressure test process in a petrochemical butyl device in China, it was found that the 304 stainless steel flange of the ethylene pipeline appeared to be cracking and leakage. This article analyzed the reasons for failure using macroscopic inspection, chemical composition analysis, metallographic structure analysis, scanning electron microscope, energy dispersive spectroscopy, mechanical properties test, and intergranular corrosion test. The results show that the carbon content of the flange base material exceeds the standard, many carbides precipitate at the grain boundary, the material itself is seriously sensitized, and the intergranular corrosion resistance is reduced. At the same time, under corrosive media such as sulfur and chlorine and high stress, the flange displays stress corrosion cracking, which leads to cracking and leakage failure. This article reports the reasons for the failure of the flange, and some reasonable suggestions are put forward to avoid similar leakage accidents.
Exploration of the damage evolution of HTPB propellant adhesive interface based on trilinear damage model
Authors: Jiang Pengchen , Li Chuntao , Xu Fangyi , Song Xiangyu , Li Wei 
Published: November 2024

Abstract
In this paper, the HTPB propellant was used as the research object. A uniaxial tensile test was carried out at four rates. A mesoscopic model of propellant was established using the molecular dynamics method. The trilinear cohesion model was used to describe the damage behavior of the particle/matrix interface, which revealed the damage evolution of HTPB propellant under different strain rates. The results show that the interfacial damage of HTPB propellant is diffused at a high strain rate, the damage degree is lower, and the number is higher at a lower strain rate. The method adopted in this paper can reasonably describe the damage evolution phenomenon of the adhesive interface of HTPB propellant.
Study on the bending mechanical properties of composite tube and metal joint bonding structure
Authors: Yan Liang , Xu He , Li Biao , Liu Dong , Lin Yongwen 
Published: November 2024

Abstract
The study of the mechanical properties of composite adhesively bonded joints is a very important issue, which directly affects the safety and reliability of the structure. This article studies the bending performance of carbon fiber composite tubes and metal joint bonding structures, as well as obtains the structural bearing capacity, influencing factors, and structural failure modes. Through mechanical analysis and static bending load tests, it is shown that the failure model of composite tube adhesively bonded metal joints under bending load is manifested as the first layer peeling or interlayer failure of the composite material in the bonding area between the tube and the joint, leading to local crushing at the end of the tube. There is no gap between the tube and the joint, which has little effect on the bending bearing capacity. The thickness gradient treatment at the end of the joint does not help improve the bending bearing capacity. The adhesive layer is at a 90 ° angle, which makes it easy for the first layer to peel off; it should be avoided. Other angle layers have little impact on load-bearing capacity. The longer the bonding length is, the stronger the bending capacity is. The adhesive J133 or 420 has a similar load-bearing. Wrapping a carbon fiber unidirectional layer around the ends of tubes and joints is helpful in improving their bending load-bearing capacity.
Space approaching assessment of SVOM satellite to other space objects
Authors: Li Dong , Jiang Hu , Zhang Xiaofeng , Su Ruifeng , He Junwang 
Published: November 2024

Abstract
The SVOM satellite is one of the joint space projects between China and France. It was successfully launched into the preferred orbit in June 2024. Its goal is to monitor the Gamma Ray Burst in space. The mission consists of 4 main instruments: ECLAIRs, MXT, GRM, and VT. The ECLAIRs telescope is used to detect and position gamma bursts in the X-ray band and low-energy gamma rays. Micro-channel X-ray Telescope (MXT telescope) will make the observation of gamma bursts in the soft X-ray range. GRM (Gamma Ray Burst Monitor) is used to measure the spectrum of high-energy bursts. VT telescope (Visible Telescope) operates in the visible range to detect and observe the visible emission produced immediately after a gamma burst. Based on recent orbit elements for the SVOM satellite, which was available via TT&C, SOCRATES Plus software is used to carry out space collision assessment for the SVOM satellite. SVOM and the accompanying satellite shared the same rocket before they were sent into their own preferred orbits. During the simulations, the mean main orbit elements are derived from the GNSS PV data sets, which can help to know the orbit health of SVOM. On June 27, 2024, the distance between SVOM and the accompanying satellite varies between 509 km and 620 km, and the distance between SVOM and the rocket residual varies between 441 km and 5263 km. On July 2, 2024, the distance between SVOM and the accompanying satellite varies between 1067 km and 1180 km, and the distance between SVOM and the rocket residual varies between 357 Km and 5107 Km. In addition, space approaching the SVOM satellite and other objects is simulated for five-day intervals; it turns out that there are three space objects approaching the SVOM satellite with about 4 km - 5 Km separation.
Research on load prediction of carrier-based aircraft landing test based on measured data
Authors: Xie Feng’an , Xu Whenchao 
Published: November 2024

Abstract
As one of the most important parts in the ground (carrier) landing process of carrier-based aircraft, undercarriage is directly related to the safety of the aircraft, the crew, and even the landing platform with its strength and stiffness. The landing test to evaluate the strength and stiffness of the undercarriage of the carrier-based aircraft has strict regulations on the sinking velocity of the aircraft during landing. Still, in consideration of safety, it is difficult for the aircraft to reach the sinking velocity specified in the test under normal conditions. In this thesis, based on a large number of measured flight data, the artificial neural network was used to reasonably predict the undercarriage landing load of carrier-based aircraft and improve the landing test points, thus providing a new idea for the research on undercarriage load strength.
Three-dimensional CFD model and aerodynamic analysis of dragonfly’s corrugated wing during gliding
Authors: Xu Minghao , Xia Wei , Zhang Xin , Hu Shuling 
Published: November 2024

Abstract
The aerodynamic performance of micro air vehicles (MAVs) in low-speed flight would be improved by mimicking the dragonfly’s wing with corrugated airfoil. Research on two-dimensional corrugated airfoils has revealed that the local vortex in the corrugated structure increases the flow speed and the lift-to-drag ratio in low Reynolds numbers. However, studies seldom focus on the effects of three-dimensional corrugated structures on aerodynamics. In this paper, the mechanism of high aerodynamic performance in a dragonfly’s wing is studied considering a three-dimensional corrugated structure. The high-fidelity dragonfly forewing model is established through reverse engineering. The computational fluid dynamics (CFD) simulation is performed for the gliding corrugated wing with angles of attack (AOA) of 0°-24° under three Reynolds numbers. The flow characteristics of corrugated wings and the aerodynamic gain from it are analyzed through the simulated streamlines and pressure contours, as well as the comparison between the corrugated wing, flat wing, and flat plate. The results show that the aerodynamic characteristics of corrugated wings are generally superior. Although the introduction of the corrugated structure increases some drag, it brings a higher lift and lift-to-drag ratio than the flat wings.
Research on assisted recovery algorithm of stall state based on signal guidance
Authors: Zhang Qi , Gu Bo , He Tai , Fang Zili 
Published: November 2024

Abstract
Given the lack of quantitative guidance in the current stall recovery process, which leads to the pilot’s misoperation or untimely recovery, referring to the energy control theory of complex state recovery, a stall state-assisted recovery algorithm based on pitch angle, engine thrust, and roll angle signal guidance was determined. The structure pilot model and the kinematics simulation model of aircraft at a high angle of attack were established. The effectiveness of the algorithm has been verified by simulation analysis. The man-machine closed-loop simulation analysis results show that the algorithm can guide the pilot in effectively recovering from stall conditions under different stall scenarios and engine failure conditions.
Research on optimization of flatness evaluation method for antenna array of a radar vehicle
Authors: Pan Yunping , Yang Yirao 
Published: November 2024

Abstract
Radar vehicles play an important role in providing radar services in the aviation field. The flatness of the antenna array is one of the key factors in ensuring the detection accuracy of radar vehicles for airborne targets. In this paper, the mechanical structure of a new type of radar antenna truck is designed, the stress analysis under various working conditions is carried out, the mechanical performance of the whole vehicle is checked, and the evaluation method of the flatness of the antenna array is discussed. Using ANSYS to carry out static finite element analysis and using the deformation results of each element node in ANSYS, the evaluation method based on the multiple regression function is applied to the calculation scheme of antenna array flatness. The final results show that the safety factor of the radar vehicle structure can reach more than 1.75 under extreme working conditions and more than 2.0 under other working conditions. It can work safely. Through the optimization of the shape evaluation method, the accuracy of the final shape calculation result is less than 10mm. The precision of shape error processing is improved.
Research on the meteorological data transmission system of civil aircraft based on BeiDou satellite
Authors: Gao Yijia , Zhang Zhan , Wang Jue , Li Tieshuai , Chen Jia 
Published: November 2024

Abstract
With the official opening of the Beidou-3 global satellite navigation system, Beidou has entered a new era of global services, extending its service area to the whole world. With the advantages of sufficient data volume and high data security, the BeiDou-3 short message satellite communication system can provide global communication services for airlines, realize two-way data transmission between air and land, and effectively reduce the operating costs of airline companies. Aiming at the demand for low-cost civil aircraft weather data transmission proposed by domestic and foreign airline companies, the current development of civil aviation weather information transmission and the current application status of BeiDou in civil aviation were studied, and the BeiDou satellite-based civil aircraft weather data transmission system was designed. The system architecture, detailed functions and data transmission workflow were analyzed, and the message coding structure was designed using bit-based coding technology. Finally, the feasibility of the scheme is verified through the data demand analysis of weather news and the onboard flight test on a domestic aircraft. The results show that t-he BeiDou short message function has the ability to realize the weather data transmission of a civilian aircraft.
Experimental research of helicopter blade load in flight based on optical sensing
Authors: Geng Lisong , Wang Zefeng , Zhang Honglin , Yang Qianqian 
Published: November 2024

Abstract
The actual flight measurement of blade load is an extremely important part of the new helicopter. In order to solve the problems existing in the traditional electrical measurement method, such as weak anti-interference ability, short life, and large added mass, a flight measurement method of blade load based on optical sensing is proposed. Firstly, the strain mode distribution law is obtained by calculating the dynamic response of the real blade. The optimal layout of the optical fiber measurement points is determined. Through theoretical analysis of strain transferring and experimental verification, a highly reliable fusion scheme of blade and fiber is designed to meet the flight requirements. Based on the power line carrier technology, the optical sensing test system for helicopter flight test is developed. The flight test of blade load is completed successfully. The results of optical fiber measurement are consistent with the results of traditional electrical measurement, which indicates that the optical sensing technology has good applicability in the measurement of helicopter blade load. At the same time, it has been proved that the optical measurement system set is reliable and durable. It is of great significance for the leap from electric measurement to optical measurement.