bluuebunny/crossref_metadata_2025_split huggingface dataset:
Creep deformation of DD15 single crystal superalloy at 980°C/250MPa
Authors: Shi Z X , Liu S Z , Wang X G , Li J R 
Published: January 2024

Abstract
The creep deformation behavior of DD15 alloy was studied under the condition of 980°C/250MPa. The microstructure characteristic and dislocation feature were analyzed after the different creep strain. The creep strain was 0.2%, 0.5%, 1%, 2% and rupture, respectively. The result shows that the creep properties at 980°C/250MPa of DD15 alloy was very good. The first stage creep life was relatively short. When the strain of the alloy was 0.2%, the creep deformation process had already been into the second stage. The second stage creep life was relatively long, which is the majority of the whole life. When the alloy strain was 2%, the creep was in the tertiary stage in which the creep rate increased significantly. The γ′ precipitates were rafted for all the specimens with different strain, and the dimension of raft row in the stress direction slightly grew up as the strain rised. The TCP phase did not precipitated for all samples with different strain. The above results indicate that DD15 alloy has excellent microstructure stability. The dislocation network formed on the two-phase interfaces, and a few dislocations cut into γ′ precipitates in creep specimen deformed with 0.2% strain. With increase of creep strain the dislocation network of sample turned denser.
Effect of secondary orientation on the microstructures in thin-walled castings of nickel-based single-crystal superalloys
Authors: Xu Hanyuan , Huang Taiwen , Zhang Chao , Zhang Jun , Liu Lin 
Published: January 2024

Abstract
With the increasing turbine inlet temperature of aero-engine, the requirement of temperature capacity of turbine blades is more stringent. A variety of complex cooling structures have been designed, among which the micro cooling represented by lamilloy is the latest development. At present, the thickness of lamilloy turbine blade is 0.5 mm or less. The reason for performance degradation caused by thin-walled is still controversial and the understanding of dendrite growth behaviour under space constraints is insufficient. In this study, 0.75 mm wall thickness nickel-based superalloy DD403 samples were cast by high-rate directional solidification. The growth and evolution of dendrites in plank-shaped specimens with different secondary deviation angles were investigated. The variation of dendrite spacing and the arrangement of dendrites under different secondary deviation angles were studied. It is found that the primary dendrite arm spacing in the thin-walled region decreased with the increase of the secondary deviation angle, but there was no significant change in the average size of γ′ phases and elements segregation.
Engineering the flexibility of graphene/h-BN lateral heterojunctions
Authors: Li Yi , Liu Lizhao , Huang Xiaoming 
Published: January 2024

Abstract
Employing the first-principles calculations, the mechanical properties of graphene/hexagonal boron nitride (h-BN) lateral heterojunctions were studied, including the Young’s modulus and bending modulus. It was found that by varying the ratio of graphene in the graphene/h-BN heterojunction, both the Young’s modulus and bending modulus of can be effectively engineered. Particularly, the bending modulus increases with the ratio of graphene to h-BN, providing a way to tailor the flexibility of two-dimensional materials.
Corrosion behavior of X65 steel in gaseous and liquid CO2 transport environments containing multiple impurities and different H2O content
Authors: Yang W J , Zhao X F , Sun C , Xu X X , Sun J B 
Published: January 2024

Abstract
The mechanism of H2O content in different CO2 phase states on the corrosion of pipeline steel was studied by using high-pressure corrosion simulation tests, scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and water chemistry simulation calculations. The results show that the corrosion mechanism of X65 steel did not change significantly under different CO2 phase state systems, and the corrosion products were similar. As the H2O content of the system increased, the sulfur-containing products in the corrosion products increased and the degree of corrosion worsened. Additionally, because the aqueous phase formed by the liquid CO2 system contained more corrosive substances, which promote the electrochemical corrosion process of X65 steel, the corrosion degree of X65 steel in a liquid CO2 system was significantly higher than that of X65 steel in a gaseous CO2 system.
Analysis and Suggestions for the Self-blast Problem of Glass Insulators on Transmission Lines
Authors: Zhao Tongkun , Zhang Suhui , Li Jun , Gao Jian 
Published: January 2024

Abstract
By virtue of many advantages such as good self-cleaning ability, outstanding mechanical performance, and excellent anti-vibration-fatigue ability, the glass insulators have been widely used in various alternating-current and direct-current transmission lines. However, the self-blast incidents of glass insulators have frequently occurred in transmission lines with various voltage levels, seriously affecting the safe operation of transmission lines. Herein, the main causes of self-blast problem of glass insulators are summarized and analysed from different perspectives, and some corresponding suggestions have been proposed to reduce the self-blast of glass insulators. In addition, the relevant prospects are provided for the future research work about the glass insulators. The viewpoints in this article have important theoretical and practical significance for improving the safety and reliability of transmission lines and ensuring the stable operation of electrical power systems.
Multi-layered perceptron network for short-term load forecasting
Authors: Tchakala Mouctar , Tafticht Tahar , Rahman Jahidur 
Published: January 2024

Abstract
The use of the multi-layer perceptron (MLP) network for short-term load forecasting is performed. Through weather and load data from the Hydro-Quebec database, capabilities, advantages, and limitations of this artificial intelligence method in load forecasting are investigated. Current management tools for energy systems are based on deterministic optimization methods, where supply, demand, and production are assumed to be known. Changes in electricity supply and demand have made their adjustment more complex. It is no longer a question of adjusting centralized production to demand, but rather of adjusting centralized production, decentralized production, and production from decentralized storage facilities. Our approach will be based on a predictive optimization method adapted to energy systems. An artificial neural network is applied to forecast load for Mascouche in Quebec, Canada. It is about a part of the Hydro-Quebec’s grid where the maximum capacity is 140 megawatts.
A coordinated planning model for power system source-network-load-storage considering multiple types of energy storage
Authors: Sun H , Li Z , Zhang K , Liu M , Yang Y , Liu J 
Published: January 2024

Abstract
Conventional power systems often neglect the amalgamation of planning and scheduling during their preparatory phases, and their methodologies of construction and operation may fall short of the requisites posed by a future characterized by a high proportion of renewable energy integration. In this paper, an integrated planning and scheduling methodology has been developed for the source-network-load-storage power system, factoring in a diverse array of energy storage modalities. Initially, cost models and operational models are formulated encompassing unit retrofitting, line expansion, demand response (DR), energy storage configuration and operation, and penalties related to solar curtailment. Subsequently, the optimization functions and operational constraints of each facet are harmonized, culminating in a comprehensive coordinated planning and scheduling framework for the ‘source-network-load-storage’ power system. The final phase involves simulation analysis conducted on an IEEE-30 nodes power system case. Results illustrate that the integrated ‘source-network-load-storage’ approach exhibits varied efficacies in exploiting system flexibility resources, contingent upon the distinctive capacity-power configurations of multiple types of energy storage. Prudent calibration of energy storage parameters demonstrates the potential to mitigate network underutilization and enhance overall system economics. This corroborates the viability of the proposed ‘integrated planning and scheduling’ model for the power systems.
Trajectory planning of vibration suppression for hybrid structure flexible manipulator based on differential evolution particle swarm optimization algorithm
Authors: Fan Pu , Hu Haidong 
Published: January 2024

Abstract
A differential evolution particle swarm optimization algorithm is proposed to address the vibration problem of a hybrid structure flexible manipulator after motion and stop. Firstly, the errors in the modeling process of the flexible manipulator were corrected, and its state variables were decomposed to establish dynamic and kinematic models. A sliding mode controller was then designed to track the trajectory. To find the optimal trajectory, a mapping function was constructed, and non-uniform interpolation points were selected. A normal distribution function was used to select discrete interpolation points, and the cubic spline interpolation was used to fit the trajectory. To prevent the particle swarm optimization algorithm from falling into local optima, the mutation and crossover operators of the differential evolution algorithm are incorporated into the algorithm, thereby expanding the search range. The effectiveness of this improved method was verified by comparing it with traditional particle swarm optimization algorithms. This study provides a new trajectory planning approach for the motion control of a hybrid structured flexible manipulator and has important practical significance.
Study on the influence of different characterization characteristics on intelligent toilet noise test
Authors: Xu Huayue , Weng Xiaowei , Tao Jiawei , Li Wenjie , Zhan Ni , Li Haiyan 
Published: January 2024

Abstract
With the improvement of the living standards of urban and rural residents, the popularity of intelligent toilets is increasing year by year. The noise issue of intelligent toilets has become one of the main complaints from consumers. The noise of intelligent toilets mainly comes from three functions: cleaning, blowing, and flushing. Due to the lag in research on relevant noise measurement theories and technologies, there is currently a gap in the standards for supporting testing methods. This article adopts step-by-step measurement and overall measurement methods and selects F gear, S gear, and I gear to measure the noise of the tested samples separately. The measurement results of different methods are measured according to L50 and L10, providing a scientific basis for evaluating the noise-influencing factors of intelligent toilet products.
Drill pipe joints fatigue analysis and optimization under special working conditions
Authors: Li Yadong , Nie Minghu , Hu Kaili , Chen Hao , Zhu Zhongxi , Qiao Mu 
Published: January 2024

Abstract
Recently, the number of ultra-deep and extended reach wells has continuously increased. The failure of the drill pipe is prominent when drilling. The thickened area of the drill pipe body and the position of the drill pipe joint often appear fatigued, especially the internal thickening zone for the nonlinear structure of the cast component. Fatigue failure occurred at the drill pipe joint due to non-linear contact between the male and female snaps. The fatigue life S-N curves show that the overall life of drilling with high-resistance torsion drill pipe is increased by 136% compared with API drill pipe, though the maximum stress value was reduced by 8.4%. The high-bend drill pipe has an overall life improvement of 174% over the API drill pipe. High flexural drill pipe reduces stress by 10% compared to the maximum value. At the same time, the drill pipe’s fatigue period and safety factor can be improved by adjusting the drilling speed and annulus pressure properly.
Noise analysis of interior structure under powertrain excitation
Authors: Bai Zhenhe , Wei Jiashuai , Chen Ke 
Published: January 2024

Abstract
To accurately identify the structural noise problem caused by vibration in the cockpit, an experimental study was conducted on a certain type of SUV under uniform acceleration conditions. Based on the planning of the multi-body system dynamics model, a transfer path model with secondary contributions is constructed, and the load is identified using the single degree of freedom model and multi-frequency bandwidth model under the OPAX method based on this path. The results indicate that the second-order vibration of the powertrain is transmitted to the entire suspension system through the X direction of the right suspension. The second-order vibration of the suspension system is then transmitted to the Z direction of the right rear bolt of the subframe, causing the entire subframe vibration and ultimately reaching the target point. This structural path has the greatest impact on the interior noise of the vehicle. This path research method can more accurately determine the main excitation points that cause interior noise problems on a certain path and better understand the overall energy transfer characteristics along the transmission path.
Study of optimization of blade non-uniform allowance process and chatter stability domain
Authors: Wu Yan , Han Shizhan , Chen Xiaoshuai , Xie Yongle 
Published: January 2024

Abstract
In addressing the phenomenon of chatter during the machining of thin-walled components, a machining strategy involving the implementation of a continuous non-uniform toolpath has been proposed as a remedy for chatter suppression. The methodology commences with a meticulous determination of machining allowances, accomplished by utilizing fitting functions. Subsequently, the stiffness coefficients and natural frequencies inherent to the workpiece-tool system are extracted through modal analysis. A stability lobes diagram is formulated, employing the principles of regenerative chatter analysis. This diagram encompasses both uniform toolpath scenarios and non-uniform continuous toolpath scenarios, with the latter established via the least squares method. The resultant stability lobes diagram effectively delineates the boundaries within which chatter remains stable, under varying depths of cut. The stability lobes diagrams substantiate the effectiveness of the non-uniform continuous toolpath constructed via the least squares method in significantly augmenting the inherent stiffness coefficient of the workpiece-tool system, thereby mitigating chatter. This approach serves as a valuable guide for the manufacturing of intricate curved thin-walled components.
Form-finding of tensegrity structures based on genetic algorithm
Authors: Zheng Mingxiang , Du Zhengyin , Li Hui , Lin Min , Ji Zhifei 
Published: January 2024

AbstractWe develop a novel form-finding method that utilizes force density and a genetic algorithm. Firstly, the equilibrium equation is derived by using the force density method. Next, the force density matrix is decomposed through QR decomposition. Subsequently, an optimization objective function is introduced, which incorporates information about the force density values. The optimal solution for the objective function is obtained through the use of a genetic algorithm. We determine a suitable set of force density values that satisfy the requirements of the equilibrium matrix rank deficiency, force density rank deficiency, and precision, thereby establishing the equilibrium configuration of the structure. The simulation results verify the reliability of the proposed method. With its advantages of straightforward calculations, rapid convergence, and high precision, this method proves to be well-suited for the form-finding of both regular and irregular tensegrity structures.
Research on transition corridor of distributed tilting power configuration
Authors: Chen Shengjiu , Yang Youxu , Zhang Xingcui , Wang Bin 
Published: January 2024

Abstract
For a distributed tilt-power configuration aircraft, the transition corridor was studied based on limited conditions such as wing lift characteristics and propeller power requirement. By establishing the dynamic model of each component and balancing according to the balance equation, the boundary of the transition corridor of distributed tilting dynamic configuration is determined. The results show that the minimum forward flight speed required for a low Angle of attack is less than that for a high Angle of attack; the wing lift characteristic high-speed boundary and the propeller power limit boundary together form the high-speed boundary of the transition corridor.
Thermal design of focal plane assembly of wavefront camera for exoplanet imaging corona module
Authors: Wen Chengcheng , Jiang Shu , Xu Mingming , Kong Lingyi , He Jinning 
Published: January 2024

Abstract
The focal plane assembly of wavefront camera is the key imaging device of wavefront detection camera and the key load of the exoplanet imaging coronagraph module. In order to ensure the imaging quality and reduce the dark current and thermal noise, it is necessary to effectively dissipate the heat of the focal plane CCD and other high-power electronic devices to ensure the working performance and reliability of the focal plane assembly. Based on the limited space and cooling resources, this paper adopts the flexible graphene heat conducting cable and grooved heat pipes, and carries out detailed thermal design and thermal analysis of its cooling path. The finite element model is established by thermal analysis software and thermal simulation is carried out. in that steady state, the work temperature range of the CCD chip is -12.8∼-10.9°C, which meets the temperature control index, and the work temperatures of other components are also within the design requirements, which indicate that the thermal design scheme is reasonable and feasible, and meets the task requirements.
Parameter optimization design of an aero-engine bearing chamber based on active learning Kriging
Authors: Qian Yuming , Li Jingkui , Qu Binjie , Liu Zhibin 
Published: January 2024

Abstract
The air-oil two-phase flow in the aero-engine bearing chamber is highly complex and unsteady. To obtain the mapping relationship between the oil volume fraction in the chamber and the oil inlet flow rate and rotational speed for further design optimization, the air-oil two-phase flows are simulated using the level set method in COMSOL Multiphysics software. To avoid frequent calls to the simulation model during the optimization process, which consumes huge computational costs, the Kriging model is applied to approximate the true response of the computational fluid dynamics (CFD) simulations. The point addition process is assisted by introducing the active learning function EI to enhance the efficiency of constructing the Kriging model. Particle swarm optimization (PSO) is applied to optimize the Kriging-based optimization objective function. With the optimal parameters’ combination, the performance of the oil return in the aero-engine bearing chamber is improved. This study has guiding significance for the lubrication design of the aero-engine bearing chamber.
Influence on the roof stability of EMU induced by welding deformation
Authors: Li Yana , Yin Xingfu , Zhang Zeyang 
Published: January 2024

Abstract
The EMU roof with a thin plate structure is prone to buckling deformation during welding, which will affect its stability. Due to the complex structure, large size, and many types of welded joints, it is an urgent problem to solve the influence of different joint shapes on welding deformation and buckling stability in one model. Based on the inherent strain-temperature loading method, the inherent strain data of four kinds of local joint butt, lap, fillet, and plug welding were accurately obtained through joint welding deformation verification. Then the welding deformation simulation and buckling stability analysis were conducted. The results indicate that plug welding will have minimal impact on roof deformation. The roof buckling deformation cannot occur under the original and 1.2 times heat input conditions are selected within the range of the actual given heat source parameters. Under the 1.5 times heat input condition, the roof buckling deformation occurs. The results provide technical support for the selection of the welding process and the roof stability study of the EMU.
Study on the influence of al content on elevated temperature oxidation of MgF2 in HFP/air atmosphere
Authors: Chen Hukui , Jie Yangyang , Chang Li 
Published: January 2024

Abstract
The influence of Al content on the high-temperature oxidation of MgF2 in an air/HFP atmosphere at temperatures ranging from 700 to 1000 °C has been studied with XRD and EDS. The results reveal that the addition of Al accelerated the oxidation of MgF2. With increasing Al content in MgF2, the oxidation of MgF2 was increased. At the same Al content, the oxidation of MgF2 also increased as the temperature rose. These results suggest that the increase of the Al content of MgF2 and the temperature decreased the high-temperature stability of MgF2.
Effect of Al content on microstructure and mechanical properties of Alx(Nb3TaTi3Zr)100-x
refractory high-entropy alloys
Authors: Chen Sishuo , Bao Li , Yang Hongtao , Si Xudong , Yu Qi 
Published: January 2024

Abstract
In this study, seven refractory high-entropy alloys of Al
x
(Nb3TaTi3Zr)100-x
(x = 0, 5, 10, 15, 20, 25, 30) were synthesized by vacuum arc melting and characterized by various techniques, including XRD, SEM, EDS, compression tests at both 1200 °C and room temperature, as well as hardness tests. The analysis revealed that the alloys exhibit a single BCC structure when the Al content is between 0 and 15%, while the B2 phase appears at 20% and a mixed structure of BCC + B2 + σ phase at 30%. As the Al content increases, the hardness, stiffness, and room temperature yield strength of the alloy increases, while the plasticity decreases. Notably, the alloy with 25% Al content displayed the highest yield strength of 1400 MPa and Young’s modulus of 75.94 GPa at room temperature. Moreover, the hardness of the seven alloys increased from 247 HV to 490 HV with Al content from 0 to 30%. Furthermore, the alloy containing 30% Al exhibited a notable elevated-temperature yield strength of 143 MPa at 1200 °C.
Effect of hydrogen on the fretting wear mechanism of a high Nb-TiAl alloy
Authors: Qian Chunguang , Sun Yongshuo , Liu Lihua , Wen Daosheng , Wang Xinwei , Yuan Haifeng 
Published: January 2024

Abstract
In this paper, the effect of hydrogen placement on the microdynamic wear mechanism of high niobium-titanium-aluminum alloys is investigated. Corresponding decreases and increases in loading force and displacement amplitude cause the microslip behavior of the alloy to change from partial slip to mixed slip. Slip type in mixed fire complete slip when you, the friction coefficient fluctuates. The average friction coefficient of hydrogen-placed alloys is small compared with that of non-hydrogen-placed alloys, the maximum wear marks are not obvious, and the oxidative wear is weak. The main wear mechanisms of non-hydrogenated alloys are adhesive wear, abrasive wear and oxidative wear. The main wear mechanisms of hydrogen-placed alloys are adhesive wear and abrasive wear.