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2023 International Conference on Machine Learning and Cybernetics, ICMLC 2023

作者： Du, Jiang Da-Lin, Zhou Gong-Fa, Li Bao-Li, Lu Jun-Tong, Yun Ying, Liu Wuhan University of Science and Technology Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan430081 China School of Computing University of Portsmouth PortsmouthPO1 3HE United Kingdom China Three Gorges University Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance Yichang443002 China Wuhan University of Science and Technology Key Laboratory of Mechanical Transmission and Manufacturing Engineering of Hubei Province Wuhan430081 China Precision Manufacturing Research Institute Wuhan University of Science and Technology Wuhan430081 China Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Research Center for Biomimetic Robot and Intelligent Measurement and Control Wuhan University of Science and Technology Wuhan430081 China

ISBN: (纸本)9798350303780

The path planning of mobile robots is investigated to minimize energy loss in intelligent manufacturing. To achieve optimal energy consumption planning, this paper proposes a hybrid strategy that enhances the whale optimization algorithm (WOA) and the genetic algorithm (GA). The WOA-GA algorithm combines their respective advantages and effectively mitigates premature convergence exhibited by the standard traditional algorithm. To enhance the global and local search capabilities of the standard WOA, we employ adaptive weighting and a Cauchy mutation strategy. Additionally, we introduce an adaptive crossover mutation probability and an elite strategy to mitigate the detrimental effects of the genetic algorithm's evolutionary operation in the late iterations, thereby improving its performance. This paper compares the performance of the standard GA, the standard WOA-GA algorithm, and the enhanced WOA-GA algorithm. The experimental results demonstrate that the enhanced WOA-GA algorithm can achieve optimal energy-efficient path planning using the hybrid strategy. The average energy consumption of the enhanced WOA-GA algorithm can be reduced by 30%, while the maximum energy consumption can be reduced by 47%. The results confirm the effectiveness and feasibility of the proposed method in enhancing the level of green manufacturing. © 2023 IEEE.

关键词： Genetic algorithms

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Effect of Current Density and Strain Rate on Deformation Resistance During Electrically-Assisted Compression of AlCr1.3TiNi2 Eutectic High-Entropy Alloys

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Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering 2025年第5期54卷 1121-1126页

作者： Wang, Fanghui Li, Hushan Zhang, Hao Ding, Ziheng Bao, Jianxing Ding, Chaogang Shan, Debin Guo, Bin Xu, Jie Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education Harbin Institute of Technology Harbin150001 China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China Xi'an Rare Metal Materials Institute Co. Ltd Xi'an710016 China

The effect of deformation resistance of AlCr1.3TiNi2 eutectic high-entropy alloys under various current densities and strain rates was investigated during electrically-assisted compression. Results show that at current density of 60 A/mm2 and strain rate of 0.1 s−1, the ultimate tensile stress shows a significant decrease from approximately 3000 MPa to 1900 MPa with reduction ratio of about 36.7%. However, as current density increases, elongation decreases due to intermediate temperature embrittlement. This is because the current induces Joule effect, which then leads to stress concentration and more defect formation. Moreover, the flow stress is decreased with the increase in strain rate at constant current density. Copyright © 2025, Northwest Institute for Nonferrous Metal Research. Published by science Press. All rights reserved.

关键词： Stress concentration

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Plating Al Coating on High-Strength Steel in Chloroaluminate Ionic Liquid Under Pulse Current Modes

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SSRN 2024年

作者： Nan, Yang Li, Wen Li, Shaojie Wei, Qi Li, Weiping Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing100024 China School of Materials Science and Engineering Beihang University Beijing100191 China

Aluminum coating is a potential candidate for cadmium coating replacement due to its excellent corrosion resistance and nontoxicity. Among the fabrication methods of Al coating, plating Al via ionic liquids has drawn major attention of researchers because of the superiority of controllability, stability and low energy consumption. However, the evolution rules of plating aluminum on high-strength steel via pulse current modes at room temperature requires deeper investigation. In this work, pulse current density and pulse duty factor are regulated to reveal the plating patterns of Al on 300M high-strength steel in AlCl3-EMIC (2:1 in mole) ionic liquid. It is found that higher current density can significantly facilitate the nucleation of Al grains and the compactness of morphology, while an enlarged pulse duty factor tends to result in more regular Al crystals. When the current density and the pulse duty factor are fixed at 20 mA cm−2 and 80%, the densest and most uniform aluminum coating is obtained. The component of Al coating is verified to be pure Al crystals with good adhesion and the plating process achieves a high current efficiency of 97.27%. Under the protection of Al coating, the impedance and galvanic corrosion current density of 300M steel substrate are optimized by two orders of magnitude, while the corrosion current density is markedly decreased from 5.58 μA cm−2 to 0.77 μA cm−2. © 2024, The Authors. All rights reserved.

关键词： Morphology

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Atomic surface induced by novel green chemical mechanical polishing for aspheric thin-walled crucibles with large diameters

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Journal of manufacturing Processes 2024年 117卷 59-70页

作者： Cui, Xiangxiang Zhang, Zhenyu Shi, Chunjing Peng, Qibo Liu, Xiaoyu Liu, Xiuqing Zhou, Hongxiu Feng, Junyuan Wen, Wei State Key Laboratory of High-performance Precision Manufacturing Dalian University of Technology Dalian 1160214 China School of Mechanical Engineering Hangzhou Dianzi University Hangzhou 310018 China School of Mechanical and Electrical Engineering Hainan University Haikou 570228 China China Astronaut Research and Training Center Beijing 100094 China Institute of Science and Technology Development Hainan University Haikou 570228 China School of Energy and Power Engineering Dalian University of Technology Dalian 116024 China

Aspheric thin-walled crucibles with large diameters are widely used for photovoltaics and semiconductor industries, while they have hard-brittle and aspheric characteristics. Nevertheless, these crucibles strictly require atomic surfaces and high material removal rate (MRR). This is a challenge for chemical mechanical polishing (CMP). To break this challenge, a novel green CMP was developed for fused silica, containing ceria, lanthana, hydrogen peroxide, diethylene triaminepentaacetic acid pentasodium, carboxymethyl cellulose sodium and guanidine carbonate. After CMP, surface roughness Ra of 0.115 is obtained at a scanning area of 5 × 5 μm² measured by atomic force microscopy, and MRR is 563 nm/min. In such an atomic surface, the MRR is the highest compared with those published previously. Transmission electron microscopy confirms that the thickness of damaged layer after CMP is only 2.63 nm. A novel approach of robot floating polishing is proposed for aspheric crucibles with a diameter of 810 mm and a height of 580 mm. Using the developed CMP, surface roughness Sa of 0.178 nm on inner surface of an aspheric thin-walled crucible is achieved under a measurement area of 50 × 50 μm². X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance reveal that the content of Ce³⁺ increased from 28.54 to 43.76 %. Through Raman, XPS and Fourier transform infrared spectroscopy, CMP mechanisms are elucidated. Densified damaged layer on the surface of fused silica was induced by the transformation of surface structure from six-membered to four- or three-membered network. Ce-OH and Si-OH were formed between fused silica and ceria abrasives, forming Ce-O-Si by condensation reaction of dehydration. The developed green CMP and approach provide new pathway to polish and manufacture atomic surfaces for aspheric thin-walled crucibles with large diameters. © 2024 The Society of manufacturing Engineers

关键词： Aspheric crucible Ceria Chemical mechanical polishing Fused silica Lanthana

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Study on Microstructure and Corrosion Behavior of Welded Joints of 2a12 and 2a97 Aluminum Alloys by Fsw

SSRN

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SSRN 2024年

作者： Li, Wen Li, Shaojie Nan, Yang Bai, Xuepiao Li, Weiping School of Materials Science and Engineering Beihang University Beijing100191 China Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing100024 China

T-shaped joints of high-strength aluminum alloy welded by friction stir welding (FSW) are expected to replace the traditional riveting structures. However, the corrosion of T-joint still hinder the popularization of FSW in aerospace industry. Herein, T-joints of 2A12 and 2A97 aluminum alloys are prepared and studied via structural characterization and corrosion tests. The microstructures and constituents of different micro zones in T-joints before and after corrosion tests are characterized and analyzed particularly. The internal relationship between different micro zones in T-joints and their corrosion behaviors are clarified, which provides theoretical basis for improving welding process and surface protection after welding. © 2024, The Authors. All rights reserved.

关键词： Friction stir welding

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Macroscopic and microscopic deformation mechanism of cup-shaped part made of difficult-to-deform metal during the current-assisted flow spinning process

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Journal of Materials Processing technology 2025年 340卷

作者： Chen, Can Xiao, Gangfeng Xia, Qinxiang Zhang, Junhao Cheng, Sizhu School of Mechanical and Automotive Engineering South China University of Technology Guangzhou510641 China Aircraft Maintenance Engineering College Guangzhou Civil Aviation College Guangzhou510403 China Guangdong Provincial Key Laboratory of Precision Equipment and Manufacturing Technology South China University of Technology Guangzhou510641 China

Cup-shaped parts with different thin-walled thickness structures are an essential transmission component for the harmonic reducer in aerospace and intelligent robotics engineering. However, those cup-shaped parts are usually prepared from a difficult-to-deform metal with high deformation resistance and poor plasticity at room temperature. This paper explores a current-assisted flow spinning (CAFS) method to reduce deformation resistance, improve plasticity, and promote grain refinement through electroplasticity. To reveal the mechanism of pulse current on macroscopic and microscopic deformation mechanism, a finite element model coupled with the electroplasticity effect is constructed;an experimental platform for the current-assisted flow spinning is set up, and a series of process experiments are carried out. The results show that the current density of the cup-shaped blank is concentrated near the contact area of the roller, so the softening region, due to the electroplasticity effect, highly overlaps with the deformation region of the cup-shaped blank. Thus, as the current intensity increases, the stress and the dangerous area of the cup-shaped part decreases, improving the forming quality of the spun workpiece. In addition, the gradual decrease of the current density along the axial direction from the mouth to the bottom makes the grain refinement accelerated by the electroplasticity effect at the mouth higher than that at the middle, which partially eliminates the uneven microstructure along the axial direction caused by the uneven deformation. The tensile strength and hardness of the spun workpiece under pulse current conditions increase by 8.49 % and 7.42 %, respectively. These findings provide an important theoretical basis for the current-assisted forming process to prepare high-performance and high-precision complex components made of difficult-to-deform metal. © 2025

关键词： Grain refinement

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Simulation of High Temperature Thin Film Thermocouple on Engine Blade Surface

Simulation of High Temperature Thin Film Thermocouple on Eng...

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2022 International Conference on Mechatronics and Automation technology, ICMAT 2022

作者： Zhang, Meiju Tian, Bian Ma, Rong Huang, Manguo Liang, Xiaobo Liu, Jiangjiang Zhang, Zhongkai Beijing Changcheng Aeronautic Measurement and Control Technology Research Institute Beijing101111 China Aviation Key Laboratory of Science and Technology on Special Condition Monitoring Sensor Technology Beijing101111 China State Key Laboratory for Mechanical Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9781643683669

In order to avoid the instability flutter of aero-engine blade and prevent the failure of thin film thermocouple caused by the blade in complex environment, the structural strength of the thermocouple on the actual blade surface was studied in this paper. Firstly, based on the 3D scanning of the real blade, the blade model is established after the point cloud graphics. The surface thermocouple model of the blade is established in Solidworks for simulation, and the modal and harmonic response analysis of the blade is simulated. Secondly, the vibration of the curved thin film thermocouple and the stress distribution of the blade under the acceleration shock were studied in Comsol, and the failure weakness was analyzed to avoid the failure of the thin film thermocouple caused by the bending, fracture or shedding of the thin film thermocouple on the blade due to vibration and shock, providing the most suitable thermocouple selection for the engine blade. © 2022 The authors and IOS Press.

关键词： Thermocouples

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Laser-beam powder bed fusion of Si-doped Fe-Mn alloys: manufacturing quality, phase transformation and biodegradation performance

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Electrochimica Acta 2025年 533卷

作者： Yao, Xiong Zhu, Shuaishuai Shuai, Cijun Gao, Chengde State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical Engineering Central South University Changsha410083 China Jiangxi Province Key Laboratory of Additive Manufacturing of Implantable Medical Device Jiangxi University of Science and Technology Nanchang330013 China

Fe-Mn alloys have emerged as promising candidates for biodegradable implants due to their excellent mechanical properties and good biocompatibility. Unfortunately, Fe-Mn alloys still suffer from slow degradation. In this study, laser-beam powder bed fusion (LPBF) process combined with Si doping was proposed to fabricate Fe-Mn alloys with accelerated degradation. Firstly, an optimal process parameter (laser power of 150 W, scanning speed of 60 mm s-1, and hatch distance of 0.08 mm) was identified based on the lowest surface roughness (2.61 μm) and the highest relative density (99.1 %). On this basis, the effects of varying Si contents (x = 0, 3, 6, and 9 wt %) on the phase composition and thereby the degradation behavior of LPBF-fabricated (LPBFed) Fe-25Mn-xSi alloys were systematically examined. Specifically, the extremely rapid cooling inherent to LPBF and the resulting expansion of Si solid solubility facilitated the phase transformation from γ-austenite to Ε-martensite with increasing Si content, accompanied by a decrease of α-ferrite phase content. As a result, an accelerated corrosion rate (0.26±0.02 mm y-1) was obtained for the LPBFed Fe-25Mn-6Si alloy, which was mainly attributed to the galvanic coupling corrosion occurring among the multiple phases, as well as to phase content variations induced by phase transformation. In summary, this study could offer a potential pathway for the development of biodegradable metals for implant applications. © 2025 Elsevier Ltd

关键词： Silicon alloys

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Nano-wire bridge waveguide-assisted silicon polarizing beam splitter 13

Nano-wire bridge waveguide-assisted silicon polarizing beam ...

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Holography, Diffractive Optics, and Applications XIII 2023

作者： Liu, H.P. Feng, J.J. Chen, J. Zhou, W.J. Bi, Q.Y. Zeng, H.P. School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province Soochow University Suzhou215006 China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal University Chongqing401120 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200241 China

ISBN: (纸本)9781510667853

A low-loss and wideband silicon polarizing beam splitter is demonstrated with the assistance of a nano-bridge waveguide. Transverse magnetic light can be coupled to the cross port through the nano-bridge waveguide, while the transverse electric light comes out mainly from the through port. The designed device has a coupling length of 19.6 µm, which can realize an extinction ratio of 32.43 dB for TM mode or 34.23 dB for TE mode at a 1565-nm wavelength. Compared with the conventional three-waveguide coupler structure, the proposed device is based on a resonant tunneling principle, which can help to effectively improve the fabrication tolerance. The device is fabricated with a commercial CMOS processing facility, which can achieve an extinction ratio of 23.07 dB for TM or 23.46 dB for TE mode with a low excess loss, and the extinction ratio of more than 10 dB can be realized in the wavelength range from 1525 to 1610 nm for both modes. The device performance can be further improved, which would facilitate its practical applications in commercial integrated optical circuits. © 2023 SPIE.

关键词： Silicon photonics

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Investigation on the Cracking Mechanism of Melt Growth Alumina/Aluminum Titanate Ceramics Prepared by Laser Directed Energy Deposition

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Chinese Journal of Mechanical Engineering(Additive manufacturing Frontiers) 2023年第4期2卷 23-32页

作者： Yunfei Huang Dongjiang Wu Chengxin Li Weijie Lv Guangyi Ma Cong Zhou Fangyong Niu State Key Laboratory of High-performance Precision Manufacturing Dalian University of TechnologyDalian116024China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen518055China

Oxide melt growth ceramics(OMGCs)exhibit excellent performance and microstructure stability near their melt-ing point and are expected to become a new structural material for long-term stable service in extremely high-temperature water-oxygen *** to its unique advantages of high efficiency,flexible manufac-turing,and near-net shaping,laser directed energy deposition(LDED)has become a promising technology for the rapid preparation of high-performance ***,owing to the limited understanding of the crack-ing mechanism,the severe cracking problem that hinders OMGCs-LDED towards engineering applications has not been ***/aluminum titanate(Al_(2)O_(3)/Al_(x)Ti_(y)O_(z),A/AT)ceramics are prepared using an LDED system and their cracking characteristics are ***,numerical simulations are conducted to reveal the dominant factors and influencing mechanisms of the cracking *** results demonstrate that the cracking nucleation process is mainly controlled by solidification defects,whereas the cracking propagation process is determined primarily by both the microstructure and stress *** study provides a theoretical basis for the development of appropriate cracking suppression methods for OMGCs-LDED.

关键词： Additive manufacturing Laser directed energy deposition Composite ceramics Alumina/aluminum titanate Cracking mechanism

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