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Study on orthogonal optimization of process parameters for SiCp/Al composite materials by WEDM

Materials and Manufacturing Processes 2025年第7期40卷 951-962页

作者： Sun, Zhou Kong, Linglei Lei, Weining He, Yafeng School of Mechanical Engineering Jiangsu University of Technology Changzhou China Department of Aeronautics and Mechanics Changzhou Institute of Technology Changzhou China

This study investigates the wire electrical discharge machining (WEDM) of SiCp/Al composites, focusing on the effects of pulse width (Ton), pulse gap (Toff), power tubes (PT), and wire speed (WS) on surface roughness (Ra) and cutting efficiency (CE). Through single-factor experiments and orthogonal testing, surface morphology analysis revealed that cracks, shedding grooves, and discharge pits significantly affect Ra, while exposed SiC particles and shedding grooves influence CE. Range analysis and ANOVA identified optimal parameters: Ra minimized to 3.98 μm (Ton = 16 μs, Toff = 80 μs, PT = 3, WS = 3) and CE maximized to 75.62 mm²/min (Ton = 24 μs, Toff = 80 μs, PT = 3, WS = 2). These findings provide critical insights for optimizing WEDM of SiCp/Al composites. © 2025 Taylor & Francis Group, LLC.

关键词： III-V semiconductors

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Effect of post heat treatment on microstructure, mechanical property and corrosion behavior of AlSi10Mg alloy fabricated by selective laser melting

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Progress in Natural Science:Materials International 2024年第1期34卷 89-101页

作者： Yang Zheng Zihao Zhao Ruize Xiong Guochun Ren Minghui Yao Wei Liu Libin Zang School of Aeronautics and Astronautics Tiangong University School of Mechanical Engineering Tiangong University 3D Printing Research&Engineering Technology Center AECC Beijing Institute of Aeronautical Materials Tianjin Institute of Aerospace Mechanical and Electrical Equipment

The microstructure, mechanical property and corrosion behavior of the AlSi10Mg alloy fabricated by selective laser melting(SLMed-AlSi10Mg) after different post heat treatment(PHT) of direct aging(DA), solid solution(T4)and solid solution + aging(T6) were investigated. The microstructural characterization revealed that the porosity of the SLMed-AlSi10Mg was increased from 0.41 ± 0.04 % to 3.09 ± 0.11 % with increasing temperature. The Asbuilt and DA-treated samples exhibited a microstructure of α-Al matrix surrounded with continuous Si networks,whereas the T4-treated and T6-treated samples presented a microstructure of α-Al matrix surrounded with discrete Si particles. The microhardness, strength and work hardening rate of the SLMed-AlSi10Mg increased in the order of T4-treated sample < T6-treated sample < As-built sample < DA-treated sample(a reverse order was found for the elongation), which was due to the precipitation of nanoscale Si particles after DA treatment and the softening of α-Al matrix after T4 and T6 treatments. The corrosion resistance of the SLMed-AlSi10Mg was obviously deteriorated after T4 and T6 treatments compared with DA treatment, which was caused by the changes in Si morphology, residual stress and porosity.

关键词： Selective laser melting AlSi10Mg alloy Post heat treatment Microstructure mechanical property Corrosion behavior

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Multi-scale Modeling and Finite Element Analyses of Thermal Conductivity of 3D C/SiC Composites Fabricating by Flexible-Oriented Woven Process

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Chinese Journal of mechanical engineering 2024年第3期37卷 275-288页

作者： Zheng Sun Zhongde Shan Hao Huang Dong Wang Wang Wang Jiale Liu Chenchen Tan Chaozhong Chen Nanjing University of Aeronautics and Astronautics Nanjing 210016China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China CRRC Institute Corporation Limited Beijing 100070China

Thermal conductivity is one of the most significant criterion of three-dimensional carbon fiber-reinforced SiC matrix composites(3D C/SiC).Represent volume element(RVE)models of microscale,void/matrix and mesoscale proposed in this work are used to simulate the thermal conductivity behaviors of the 3D C/SiC *** entirely new process is introduced to weave the preform with three-dimensional orthogonal *** 3D steady-state analysis step is created for assessing the thermal conductivity behaviors of the composites by applying periodic temperature boundary *** RVE models of cuboid,hexagonal and fiber random distribution are respectively developed to comparatively study the influence of fiber package pattern on the thermal conductivities at the ***,the effect of void morphology on the thermal conductivity of the matrix is analyzed by the void/matrix *** prediction results at the mesoscale correspond closely to the experimental *** effect of the porosities and fiber volume fractions on the thermal conductivities is also taken into *** multi-scale models mentioned in this paper can be used to predict the thermal conductivity behaviors of other composites with complex structures.

关键词： 3D C/SiC composites Finite element analyses Multi-scale modeling Thermal conductivity

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New Multi-Channel VSMFxLMS Algorithm for Vibration Reduction of Gear Systems

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Chinese Journal of mechanical engineering 2024年第5期37卷 233-247页

作者： Zhibo Geng Min Chen Yingjian Wang Yun Kong Ke Xiao School of Aeronautics and Astronautics University of Electronic Science and technology of ChinaChengdu 611731China Yangtze Delta Region Institute University of Electronic Science and Technology of ChinaHuzhou 313000China School of Mechanical Engineering Bejing Institute of TechnologyBeijing 100081China College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing 400044China

At present,the active control of gear vibration mostly relies on existing *** order to achieve effective vibration reduction of the gear system,particularly during the vibration process,this paper proposes a multi-channel VSMFxLMS algorithm based on the FxLMS *** novel approach takes into account the time-varying nature of the vibration signal during gear *** filter power coefficients are updated in a skip-tongue variable-step manner using momentum ***,the paper establishes the dynamics model of the gear system and analyzes the nonlinear dynamic characteristics of the *** then examines the vibration damping effect of the FxLMS algorithm and analyzes its performance under different gear system motion states,considering different step lengths and momentum ***,the proposed VSMFxLMS algorithm is compared with the FxLMS algorithm,highlighting the superiority of the ***,this research highlights the potential of a multi-channel VSMFxLMS algorithm in reducing vibrations in gear *** study optimizes the performance of gear systems while using advanced control strategies.

关键词： Vibration reduction Gear system FxLMS algorithm Multi-channel VSMFxLMS algorithm

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A new method for evaluating the firing precision of multiple launch rocket system based on Bayesian theory

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Defence technology（防务技术） 2024年第2期32卷 232-241页

作者： Yunfei Miao Guoping Wang Wei Tian College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjingJiangsuChina Institute of Launch Dynamics Nanjing University of Science and TechnologyNanjingJiangsuChina

How to effectively evaluate the firing precision of weapon equipment at low cost is one of the core contents of improving the test level of weapon system.A new method to evaluate the firing precision of the MLRS considering the credibility of simulation system based on Bayesian theory is proposed in this *** of all,a comprehensive index system for the credibility of the simulation system of the firing precision of the MLRS is constructed combined with the group analytic hierarchy process.A modified method for determining the comprehensive weight of the index is established to improve the rationality of the index weight *** Bayesian posterior estimation formula of firing precision considering prior information is derived in the form of mixed prior distribution,and the rationality of prior information used in estimation model is discussed *** the simulation tests,the different evaluation methods are compared to validate the effectiveness of the proposed ***,the experimental results show that the effectiveness of estimation method for firing precision is improved by more than 25%.

关键词： Multiple launch rocket system Bayesian theory Simulation credibility Mixed prior distribution Firing precision

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Synergy Between Soft Feet and an Active Tail to Enhance the Climbing Ability of a Bio-inspired Climbing Robot

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Journal of Bionic engineering 2024年第2期21卷 729-739页

作者： Pongsiri Borijindakul Tachadol Suthisomboon Alihong Ji Zhendong Dai Poramate Manoonpong Institute of Bio-inspired Structure and Surface Engineering College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China Bio-inspired Robotics and Neural Engineering Laboratory School of Information Science and TechnologyVidyasirimedhi Institute of Science and TechnologyRayong21210Thailand

Lizards use the synergy between their feet and tail to climb on slopes and vertical *** use their soft adhesive feet with millions of small hairs to increase their contact area with the terrain surface and press their tails against the terrain to actively maintain stability during *** by this,we propose a bio-inspired climbing robot based on a new approach wherein the synergy between soft feet and an active tail with a soft adhesive tip allows the robot to climb stably on even and uneven terrains at different slope *** evaluate and compare the climbing performance of the robot on three different terrains(hard,soft,and fluffy)at different slope *** robot configurations are employed,including those with standard hard feet and soft feet in combination with an active tail-with and without a soft *** experimental results show that the robot having soft feet and a tail with the soft tip achieves the best climbing performance on all terrains,with maximum climbing slopes of 40°,45°,and 50°on fluffy,soft,and hard terrains,*** payload capacity depends on the type of terrain and the inclination ***,our robot performs multi-terrain transitions(climbing from horizontal to sloped terrains)on three different terrains of a *** approach can allow a climbing robot to walk and climb on different terrains,extending the operational range of the robot to areas with complex terrains and slopes,e.g.,in inspection,exploration,and construction.

关键词： Bio-inspired climbing robots Climbing robots Soft foot Active tail Soft terrain Terrain transitions

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High-precision trajectory tracking control of helicopter based on ant colony optimization-slime mould algorithm

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Chinese Journal of aeronautics 2025年第1期38卷 395-408页

作者： Binwu REN Siliang DU Zhuangzhuang CUI Yousong XU Qijun ZHAO National Key Laboratory of Helicopter Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016China Faculty of Mechanical&Material Engineering HuaiYin Institute of TechnologyHuaian 223003China

To achieve high-precision trajectory following during helicopter maneuver tasks and reduce the disruptive influences of unknown variabilities,this study introduces a cascaded-loop helicopter trajectory tracking controller,whose parameters are set using an Ant Colony OptimizationSlime Mould Algorithm(ACO-SMA).Initially,a nonlinear flight dynamics model of the helicopter is *** gain functions and nonlinear feedback from a vibrational suppression function to improve the tracking performance of the controller,addressing issues in disturbance estimation and compensation of the Active Disturbance Rejection Control(ADRC).Simultaneously,a cascaded loop system,comprising an internal attitude loop and an external position loop,is created,and the ant colony-slime mold hybrid algorithm optimizes the system parameters of the trajectory tracking ***,helicopter trajectory tracking simulation experiments are conducted,including spiral ascending and“8”shape climbing *** findings indicate that the ADRC employed for helicopter trajectory tracking exhibits outstanding performance in rejecting disturbances caused by gusts and accurately tracking *** trajectory tracking controller,whose parameters are optimized by the ACO-SMA,shows higher tracking precision compared to the conventional PID and ADRC,thereby substantially improving the precision of maneuver tasks.

关键词： Flight control systems Helicopter ADRC Trajectory tracking ACO-SMA Spiral ascent "8"shape climbing

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PREPARATION AND THERMOELECTRIC PROPERTIES OF Cux/Bi2Te3 COMPOSITES

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Composites: Mechanics, Computations, Applications 2024年第3期15卷 35-43页

作者： Li, Fanguo Lu, Shihong Liu, Luteng Li, Junping Zhang, Zhang Yan, Peimei Pan, Yile Institute of Mold Technology Changzhou Vocational Institute of Mechatronic Technology Changzhou China College of Mechanical & Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing China College of Vehicle Engineering Changzhou Vocational Institute of Mechatronic Technology Changzhou China

Thermoelectric materials are the use of solid internal carriers to realize mutual conversion between thermal energy to electrical energy. Bismuth telluride (Bi2Te3) based thermoelectric materials are relatively mature near low temperatures. Due to the excellent conductivity of copper, the method of combining copper with a thermoelectric matrix to produce thermoelectric composite materials with better thermoelectric properties has always been a research focus in thermoelectric composite materials. Bismuth telluride thermoelectric composite materials (Cux/Bi2Te3) samples with different mass percentages of purity (Cu) powder were prepared by spark plasma sintering (SPS) method. The influences of the Cu with different incorporation ratios on the performance of Cux/Bi2Te3 thermoelectric composites were investigated, such as differential thermal conductivity, thermal conductivity, Seeback coefficient, and ZT values. The Cux/Bi2Te3 thermoelectric composites with Cu chemical composition of 0.005 exhibited excellent Seebeck coefficients and ZT value at the heat source temperature of 325 K. The values are –289.46 µV/K and 1.69, respectively. The value of ZT is improved by about 2 times, compared with Bismuth telluride Bi2Te3 thermoelectric materials. © 2024 Begell House Inc.. All rights reserved.

关键词： Copper

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Recent advances in photopolymerization 3D printing of alumina-ceramic

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Progress in Natural Science:Materials International 2025年第1期35卷 1-30页

作者： M.Irfan Hussain Min Xia XiaoNa Ren Zhen Shen Muhammad Jamil Changchun Ge Institute of Powder Metallurgy and Advanced Ceramics School of Material Science and Engineering University of Science and Technology Beijing State Key Laboratory of Multimodal Artificial Intelligence Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of AutomationChinese Academy of Sciences College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics

Digital light processing(DLP) 3D printing has a huge potential for manufacturing intricate and customized ceramic parts with high precision and cost-effectiveness. Research in this field contributes to material innovation,opening the avenues for new process designs in both scientific and industrial sectors. However, the implementation of DLP 3D printing technology in ceramic research has not yet reached the maturity level as that in polymer and tissue engineering. Necessarily, a holistic in-depth literature reporting the successful integration of alumina ceramics within DLP 3D printing technology is urgently needed. This review, systematic examines recent progress in DLP technology, focusing on photopolymer resins that incorporate UV-sensitive monomers, photoinitiators, and dispersants, as well as their synergistic effects on achieving high-quality printing, desirable material properties, and enhanced performance. Further, the review discusses key factors including post-processing characteristics such as debinding and sintering, which influence microstructure, and defect formation including microcracks, porosity and voids. Finally, the challenges associated with printing and sintering are highlighted,aiming to identify focused focused development pathways and potential solution to optimize outcomes. This analysis clarifies existing challenges and also propsoes future applications for DLP technology in the aluminaceramic field.

关键词： Al2O3 ceramics Applications Digital light processing (DLP) Post-processing Resin

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Integrated attitude-orbit control of solar sail with single-axis gimbal mechanism

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Astrodynamics 2024年第4期8卷 483-506页

作者： Toshihiro Chujo Kei Watanabe Yuki Takao Department of Mechanical Engineering School of EngineeringTokyo Institute of TechnologyTokyo 152-8550Japan Institute of Innovative Research Quantum Navigation Unit Tokyo Institute of TechnologyTokyo 152-8550Japan Department of Aeronautics and Astronautics Kyushu UniversityFukuoka 819-0395Japan

A new attitude control method for solar sails is proposed using a single-axis gimbal mechanism and three-axis reaction *** gimbal angle is varied to change the geometrical relationship between the force due to solar radiation pressure(SRP)and the center of mass of the spacecraft,such that the disturbance torque is minimized during attitude maintenance for orbit *** maneuver and maintenance are performed by the reaction wheels based on the quaternion feedback control *** if angular momentum accumulates on the reaction wheels due to modelling error,it can also be unloaded by using the gimbal to produce suitable torque due to *** this study,we analyzed the attitude motion under the reaction wheel control by linearizing the equations of motion around the equilibrium ***,we newly derived the propellent-free unloading method based on the analytical ***,we constructed the integrated attitude–orbit control method,and its validity was verified in integrated attitude–orbit control simulations.

关键词： solar sail attitude control orbit control gimbal mechanism

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