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Field-assisted machining of difficult-to-machine materials

International Journal of Extreme Manufacturing 2024年第3期6卷 39-89页

作者： Jianguo Zhang Zhengding Zheng Kai Huang Chuangting Lin Weiqi Huang xiao Chen junfeng xiao Jianfeng Xu State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Mechanical Engineering Hubei University of TechnologyWuhan 430068People’s Republic of China

Difficult-to-machine materials (DMMs) are extensively applied in critical fields such as aviation,semiconductor,biomedicine,and other key fields due to their excellent material properties.However,traditional machining technologies often struggle to achieve ultra-precision with DMMs resulting from poor surface quality and low processing efficiency.In recent years,field-assisted machining (FAM) technology has emerged as a new generation of machining technology based on innovative principles such as laser heating,tool vibration,magnetic magnetization,and plasma modification,providing a new solution for improving the machinability of DMMs.This technology not only addresses these limitations of traditional machining methods,but also has become a hot topic of research in the domain of ultra-precision machining of DMMs.Many new methods and principles have been introduced and investigated one after another,yet few studies have presented a comprehensive analysis and summarization.To fill this gap and understand the development trend of FAM,this study provides an important overview of FAM,covering different assisted machining methods,application effects,mechanism analysis,and equipment design.The current deficiencies and future challenges of FAM are summarized to lay the foundation for the further development of multi-field hybrid assisted and intelligent FAM technologies.

关键词： field-assisted machining difficult-to-machine materials materials removal mechanism surface integrity

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3D printed modular Bouligand dissipative structures with adjustable mechanical properties for gradient energy absorbing

Materials Futures

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Materials Futures 2024年第2期3卷 104-116页

作者： junfeng xiao Mengxing Zhang Fei Zhai Hongrui Wei Sen Liu Peng Wang Zhiyang Liu Zhongying Ji xiaolong Wang Shenzhen Institute of Information Technology Shenzhen 518172People’s Republic of China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai Zhongke Research Institute of Advanced Materials and Green Chemical EngineeringYantai 264006People’s Republic of China School of Chemistry and Chemical Engineering Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous RegionShihezi UniversityShihezi 832003People’s Republic of China School of Transportation Engineering Shandong Jianzhu UniversityJinan 250101People’s Republic of China College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518061People’s Republic of China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesGansu Lanzhou 730000People’s Republic of China

Three-dimensional(3D)printing allows for the creation of complex,layered structures with precise micro and macro architectures that are not achievable through traditional methods.By designing 3D structures with geometric precision,it is possible to achieve selective regulation of mechanical properties,enabling efficient dissipation of mechanical energy.In this study,a series of modular samples inspired by the Bouligand structure were designed and produced using a direct ink writing system,along with a classical printable polydimethylsiloxane ink.By altering the angles of filaments in adjacent layers(from 30◦to 90◦)and the filament spacing during printing(from 0.8 mm to 2.4 mm),the mechanical properties of these modular samples can be adjusted.Compression mechanical testing revealed that the 3D printed modular Bouligand structures exhibit stress-strain responses that enable multiple adjustments of the elastic modulus from 0.06 MPa to over 0.8 MPa.The mechanical properties were adjusted more than 10 times in printed samples prepared using uniform materials.The gradient control mechanism of mechanical properties during this process was analyzed using finite element analysis.Finally,3D printed customized modular Bouligand structures can be assembled to create an array with Bouligand structures displaying various orientations and interlayer details tailored to specific requirements.By decomposing the original Bouligand structure and then assembling the modular samples into a specialized array,this research aims to provide parameters for achieving gradient energy absorption structures through modular 3D printing.

关键词： 3D printing additive manufacturing Bouligand structure energy absorbing structures

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Experimental investigation for ultra-precision cutting of nickel based superalloy with the assistance of magnetic field

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Science China(Technological Sciences) 2022年第9期65卷 2170-2177页

作者： xiao junfeng GUO Feng ZHANG Chen CHEN xiao ZHANG JianGuo XU JianFeng State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering Hubei University of TechnologyWuhan 430068China

Nickel based superalloy is an important material because of its excellent properties under high temperatures.However,it is a difficult-to-machine material due to its low thermal conductivity,which can cause undesired localized high temperatures in the processing area.In this study,magnetic field-assisted end face turning experiments of nickel-based superalloy is carried out under the assistance of external magnetic fields of different strengths formed by permanent magnets.The experiment results show that,compared with ordinary machining,the chip morphology is improved,the oscillation of cutting force F_(c),F_(a),and Ffare significantly reduced by 90%,88%,and 78%,and the surface roughness Ra is improved from 23 to 13 nm,the P-V value of the fan-shaped area of the machined surface is reduced,and hardness and ductility are improved after the magnetic field is applied.The experiment results indicate that the application of a magnetic field is an efficient and convenient approach to improve the cutting performance of nickel based superalloy.

关键词： magnetic field assisted cutting nickel based superalloy ultra-precision cutting

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A cross-layer adaptive transmission scheme over correlated fading channels

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Frontiers of Electrical and Electronic Engineering in China 2007年第1期2卷 49-56页

作者： xiao junfeng QIU Jing CHENG Shiduan State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

Conventional adaptive transmission schemes perform poorly in wireless correlated slow-fading channels.A cross-layer adaptive transmission scheme combined with selective repeat automatic repeat request(SR-ARQ)is proposed.We apply a multi-state Markov system model for analyzing the performance of systems and optimizing the selection of modulation levels and packet sizes in correlated fading channels,which is also described by a finite-state Markov chain.A general closed-form expression of the average throughput for our suggested scheme is presented.Numerical results show that our adaptive scheme combined with SR-ARQ can obtain good performance in correlated fading channels.

关键词： adaptive modulation(AM) adaptive packet size(APS) automatic repeat request(ARQ) correlated fading channel Markov channel

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智能辊压成形装备(系统)及其应用案例分析

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南京航空航天大学学报 2024年第1期56卷 55-64页

作者：任银旺贺靖晟刘江熊自柳肖骏峰吴康孙勇电子科技大学(深圳)高等研究院深圳518110 深思有形(深圳)科技有限公司深圳518110

辊压成形是一种通过顺序排布的成形模具渐近横向弯曲金属带材和板材的塑性加工工艺。由于其低成本、高效率、柔性化的特点,已成为中国新能源、航空航天、轨道交通等多个领域实现轻量化、节能、减排和安全性提升的重要技术之一。但是,该... 详细信息

辊压成形是一种通过顺序排布的成形模具渐近横向弯曲金属带材和板材的塑性加工工艺。由于其低成本、高效率、柔性化的特点,已成为中国新能源、航空航天、轨道交通等多个领域实现轻量化、节能、减排和安全性提升的重要技术之一。但是,该工艺的工序复杂性和离散性、材料厚向性能的不均匀性、设备信息化和柔性化自动化的低水平等问题,导致了它类似于“黑匣子”,使得产品质量难以预测,调试生产高度依赖人工经验,可成形截面受限,成品率不稳定。为此,本文提出了一种数据驱动的智能辊压成形装备(系统),并介绍了该装备(系统)的技术架构和特点。通过搭建基于人工智能的数据架构,该系统将传统辊压成形中的离散数据进行采集、筛选、集成、储存和分析。同时融合数字孪生、人工智能、轮廓检测技术和多智能体协同控制等来构建可以替代人工经验的自纠偏的生产模式。针对新能源汽车行业,本文给出了利用该系统解决的一个辊压成形的动力电池包结构件的回弹控制案例,并对该系统的发展给出了建议和展望。

关键词：辊压成形智能装备数字孪生工业人工智能

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群体感应在发酵食品中的研究进展

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食品与发酵工业 2024年第6期50卷 290-299页

作者：王文悦余帆易弛张霖肖柯樊鑫肖俊锋朱晓青穆杨汪超周梦舟湖北工业大学发酵工程教育部重点实验室工业发酵省部共建协同创新中心细胞调控与分子药物“111”引智基地湖北武汉430068

微生物在发酵食品中起着重要作用,群体感应作为微生物依赖于细胞密度而调控其生理行为的一种机制,在发酵食品中也应受到关注。近年来有研究表明发酵食品中群体感应的调控与食品品质及风味有着密切的联系。因此,该文综述了群体感应信号... 详细信息

微生物在发酵食品中起着重要作用,群体感应作为微生物依赖于细胞密度而调控其生理行为的一种机制,在发酵食品中也应受到关注。近年来有研究表明发酵食品中群体感应的调控与食品品质及风味有着密切的联系。因此,该文综述了群体感应信号分子的定义及分类、群体感应对发酵体系中微生物和各种发酵食品的调控作用,最后对群体感应在发酵食品行业中的研究及应用前景进行了总结与展望,以期为发酵食品产业提供新的见解。

关键词：群体感应群体感应信号分子发酵微生物发酵食品调控机制

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A Coiflet Wavelet Homotopy Technique for Nonlinear PDEs:Application to the Extreme Bending of Orthotropic Plate with Forced Boundary Constraints

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Advances in Applied Mathematics and Mechanics 2023年第6期15卷 1473-1514页

作者： Qiang Yu Shuaimin Wang junfeng xiao Hang Xu College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong UniversityShanghai 200240China

A generalized homotopy-based Coiflet-type wavelet method for solving strongly nonlinear PDEs with nonhomogeneous edges is proposed.Based on the improvement of boundary difference order by Taylor expansion,the accuracy in wavelet approximation is largely improved and the accumulated error on boundary is successfully suppressed in application.A unified high-precision wavelet approximation scheme is formulated for inhomogeneous boundaries involved in generalized Neumann,Robin and Cauchy types,which overcomes the shortcomings of accuracy loss in homogenizing process by variable substitution.Large deflection bending analysis of orthotropic plate with forced boundary moments and rotations on nonlinear foundation is used as an example to illustrate the wavelet approach,while the obtained solutions for lateral deflection at both smally and largely deformed stage have been validated compared to the published results in good accuracy.Compared to the other homotopy-based approach,the wavelet scheme possesses good efficiency in transforming the differential operations into algebraic ones by converting the differential operators into iterative matrices,while nonhomogeneous boundary is directly approached dispensing with homogenization.The auxiliary linear operator determined by linear component of original governing equation demonstrates excellent approaching precision and the convergence can be ensured by iterative approach.

关键词： Wavelet method higher-order interpolating continuation homotopy analysis method geometric nonlinearity orthotropic plate

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食源性乙二醛毒性和抑制研究进展

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食品与发酵工业 2024年第10期50卷 353-361,370页

作者：余帆易弛王文悦樊鑫朱晓青肖俊峰周梦舟穆杨湖北工业大学发酵工程教育部重点实验室工业发酵省部共建协同创新中心细胞调控与分子药物“111”引智基地湖北武汉430068

乙二醛(glyoxal,GO)是糖基化过程中产生的活性二羰基,外源性GO来源为食物、饮料和香烟烟雾等,由于其高活性和高毒性而备受关注。在食品的热加工和贮存过程中生成的α-二羰基化合物,进一步增加了人类通过饮食摄入这些化合物以及由此产生... 详细信息

乙二醛(glyoxal,GO)是糖基化过程中产生的活性二羰基,外源性GO来源为食物、饮料和香烟烟雾等,由于其高活性和高毒性而备受关注。在食品的热加工和贮存过程中生成的α-二羰基化合物,进一步增加了人类通过饮食摄入这些化合物以及由此产生的晚期糖基化终末产物的风险。鉴于GO多重和复杂的毒性作用,深入阐明GO的毒性机制和相关的解毒策略是十分必要的。该文概述了食品中GO的分布、危害和毒性机制,对目前GO抑制剂的抑制机理和应用进行综述,为新型抑制剂开发和应用提供参考。

关键词：乙二醛二羰基化合物毒性机制晚期糖基化终末产物食品应用

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变截面板材腹板翘曲缺陷的影响因素研究

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汽车工艺与材料 2024年第6期 6-10页

作者：刘江熊自柳肖骏峰吴康孙勇电子科技大学(深圳)高等研究院深圳457001

随着产品更新换代的速度提高,柔性辊压工艺受到业内广泛关注,但由于其成形过程复杂性带来不可避免的缺陷,针对三次弯曲曲线的变截面板材成形过程进行数值模拟仿真,研究了材料、厚度和翼板高度对翘曲的影响。结果表明,板材产生的翘曲缺... 详细信息

随着产品更新换代的速度提高,柔性辊压工艺受到业内广泛关注,但由于其成形过程复杂性带来不可避免的缺陷,针对三次弯曲曲线的变截面板材成形过程进行数值模拟仿真,研究了材料、厚度和翼板高度对翘曲的影响。结果表明,板材产生的翘曲缺陷与纵向应变有关,当纵向应变分布均匀时,翘曲缺陷最小。通过正交模拟设计分析得出影响翘曲高度的工艺参数主次顺序为厚度、翼板高度、板材材料,得出结论:与铝合金材料相比,高屈强比高强度钢制备的翘曲高度降低,但低屈强比高强度钢制备的翘曲高度反而增高。

关键词：变截面板材数值模拟仿真腹板翘曲正交试验设计

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铜绿假单胞菌合并按蚊伊丽莎白菌肺部感染的病例分析

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药学实践与服务 2024年第5期42卷 223-226页

作者：尹小娟台力丽肖俊峰季波佛山市禅城区人民医院广东佛山528000 南部战区总医院药学部广东广州510000

目的探讨脑出血患者出现铜绿假单胞菌合并按蚊伊丽莎白菌感染的危险因素及抗菌药物治疗方案。方法临床药师参与1例脑出血患者铜绿假单胞菌合并按蚊伊丽莎白菌肺部感染的治疗过程,通过查阅文献资料,并结合患者病情、病史、用药史及相关... 详细信息

目的探讨脑出血患者出现铜绿假单胞菌合并按蚊伊丽莎白菌感染的危险因素及抗菌药物治疗方案。方法临床药师参与1例脑出血患者铜绿假单胞菌合并按蚊伊丽莎白菌肺部感染的治疗过程,通过查阅文献资料,并结合患者病情、病史、用药史及相关检查结果,分析按蚊伊丽莎白菌致病的危险因素并提出抗菌药治疗方案。结果临床药师基于感染部位、混合细菌感染特点、抗菌药动学/药效学特性等,在抗感染方案调整为临床医师提出的用药建议后,患者全身感染得到有效控制。结论按蚊伊丽莎白菌为条件致病菌,毒力较低,不易感染健康人群。但当患者免疫力低时易转化为致病菌,需引起重视。

关键词：按蚊伊丽莎白菌铜绿假单胞菌肺部感染

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