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Theoretical Modeling and Surface Roughness Prediction of Microtextured Surfaces in Ultrasonic Vibration-Assisted Milling

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 163-183页

作者： Chenbing Ni Junjie zhu Youqiang Wang Dejian Liu Xuezhao Wang lida zhu School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266525China School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China

Textured surfaces with certain micro/nano structures have been proven to possess some advanced functions,such as reducing friction,improving wear and increasing *** prediction of micro/nano surface textures is of great significance for the design,fabrication and application of functional textured *** this paper,based on the kinematic analysis of cutter teeth,the discretization of ultrasonic machining process,transformation method of coordinate systems and the cubic spline data interpolation,an integrated theoretical model was established to characterize the distribution and geometric features of micro textures on the surfaces machined by different types of ultrasonic vibration-assisted milling(UVAM).Based on the theoretical model,the effect of key process parameters(vibration directions,vibration dimensions,cutting parameters and vibration parameters)on tool trajectories and microtextured surface morphology in UVAM is ***,the effect of phase difference on the elliptical shape in 2D/3D ultrasonic elliptical vibration-assisted milling(UEVAM)was *** to conventional numerical models,the method of the cubic spline data interpolation is applied to the simulation of microtextured surface morphology in UVAM,which is more suitable for characterizing the morphological features of microtextured surfaces than traditional methods due to the presence of numerous micro *** prediction of surface roughness indicates that the magnitude of ultrasonic amplitude in z-direction should be strictly limited in 1D rotary UVAM,2D and 3D UEVAM due to the unfavorable effect of axial ultrasonic vibration on the surface *** study can provide theoretical guidance for the design and fabrication of microtextured surfaces in UVAM.

关键词： Theoretical modeling Microtextured surface Ultrasonic vibration-assisted milling Cubic spline interpolation Surface roughness

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Serrated chip characteristics and formation mechanism in high-speed machining of selective laser melted Ti6Al4V alloys

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Science China(Technological Sciences) 2023年第5期66卷 1435-1450页

作者： LIU DeJian WANG YouQiang NI ChenBing zhu lida ZHENG ZhongPeng School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao266520China Key Lab of Industrial Fluid Energy Conservation and Pollution Control Ministry of EducationQingdao266520China School of Mechanical Engineering and Automation Northeastern UniversityShenyang110819China School of Mechanical Engineering Tsinghua UniversityBeijing100084China

Serrated chips,consisting of extremely uneven plastic deformation,are a prominent feature of high-speed machining of difficultto-machine *** paper focuses on the evolution of chip form,chip morphology features(chip free surface,tool-chip contact surface,and chip edge),and chip segment parameters in subsequent high-speed(vc=50 and 150 m min-1)machining of selective laser melted(SLMed)Ti6Al4V alloys,which are significantly different from conventional Ti6Al4V alloy in microstructure,mechanical properties and *** effect of laser beam scanning schemes(0°,67.5°,and 90°),machined surfaces(top and front),and cutting speeds on serrated chip characteristics of SLMed Ti6Al4Valloys was *** on the Johnson-Cook constitutive model of SLMed Ti6Al4Valloys,an orthogonal cutting model was developed to better understand the effect of physical-mechanical properties on the shear localization,which dominates the formation mechanism of serrated chips in post-machining of SLMed Ti6Al4V *** results showed that the critical cutting speed(CCS)for chip serration of SLMed Ti6Al4V alloy is lower than that for serrated chips of conventional Ti6Al4V alloy,and the serrated profile of SLMed Ti6Al4V chips was more regular and ***,due to anisotropic microstructure and mechanical properties of SLMed Ti6Al4Valloys,the serration degree of chips produced on the top surfaces of SLMed Ti6Al4Valloys is more prominent than that of chips generated on the front *** addition,because of the poor deformation coordination and high plastic flow stresses of needle-like martensiteα′,the plastic flow and grain distortion in the adiabatic shear band(ASB)of SLMed Ti6Al4V chips are significantly smaller than those in the ASB of conventional Ti6Al4V with equiaxed grains.

关键词： serrated chips selective laser melted Ti6Al4V alloys high-speed machining chip characteristics anisotropic properties

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The crystallographic texture and dependent mechanical properties of the CrCoNi medium-entropy alloy by laser remelting strategy

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Journal of Materials Science & Technology 2022年第16期111卷 245-255页

作者： Pengsheng Xue lida zhu Jinsheng Ning Peihua Xu Shuhao Wang Zhichao Yang Yuan Ren Guiru Meng School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Laser remelting(LR)has attracted widespread attention in recent years as an effective method to reduce internal defects and improve the surface quality of additively manufactured(AM)*** the present study,three different LR inter-layer scanning strategies(LR0,LR90 and LR45)and their effects on the porosity,microstructure,crystallographic texture and related mechanical properties of parts have been *** microscope,X-ray diffraction,and scanning electron microscope were used as characterization *** the LR90 sample,it shows obvious{111}texture and strongpreferred orientation along the scanning direction(SD),while the 0°offset and the 45°rotation of LR scanning strategy form a finer microstructure and weak crystallographic ***,the mechanical properties of the LR sample are improved compared with the sample only by laser metal deposition(LMD),and a combination of higher strength and optimal uniform elongation is obtained in the LR45 *** overall results show that a reasonable LR scanning strategy can reduce the anisotropy of AM parts and improve their mechanical properties.

关键词： CrCoNi Laser remelting Porosity Crystallographic orientation Mechanical properties

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Printability disparities in heterogeneous material combinations via laser directed energy deposition:a comparative study

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International Journal of Extreme Manufacturing 2024年第2期6卷 389-405页

作者： Jinsheng Ning lida zhu Shuhao Wang Zhichao Yang Peihua Xu Pengsheng Xue Hao Lu Miao Yu Yunhang Zhao Jiachen Li Susmita Bose Amit Bandyopadhyay School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819People’s Republic of China School of Machinery and Automation Wuhan University of Science and TechnologyWuhan 430081People’s Republic of China School of Mechanical Engineering Xi’an University of Science and TechnologyXi’an 710054People’s Republic of China Beijing Institute of Space Launch Technology Beijing 100076People’s Republic of China W.M.Keck Biomedical Materials Research Lab School of Mechanical and Materials EngineeringWashington State UniversityPullmanWA 99164United States of America

Additive manufacturing provides achievability for the fabrication of bimetallic and multi-material structures;however,the material compatibility and bondability directly affect the parts’formability and final *** is essential to understand the underlying printability of different material combinations based on an adapted ***,the printability disparities of two common and attractive material combinations(nickel-and iron-based alloys)are evaluated at the macro and micro levels via laser directed energy deposition(DED).The deposition processes were captured using in situ high-speed imaging,and the dissimilarities in melt pool features and track morphology were quantitatively investigated within specific process ***,the microstructure diversity of the tracks and blocks processed with varied material pairs was comparatively elaborated and,complemented with the informative multi-physics modeling,the presented non-uniformity in mechanical properties(microhardness)among the heterogeneous material pairs was *** differences in melt flow induced by the unlike thermophysical properties of the material pairs and the resulting element intermixing and localized re-alloying during solidification dominate the presented dissimilarity in printability among the material *** work provides an in-depth understanding of the phenomenological differences in the deposition of dissimilar materials and aims to guide more reliable DED forming of bimetallic parts.

关键词： directed energy deposition printability microstructure microhardness bimetallic parts

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Measurement of ocular axial length using full-range spectral-domain low-coherence interferometry

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Chinese Optics Letters 2018年第3期16卷 57-61页

作者： Yi Wang Liang Feng lida zhu Hongxian Zhou Zhenhe Ma School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao 066004China School of Electrical Engineering Yanshan UniversityQinhuangdao 066004China

We demonstrate a system for measuring the ocular axial length(AL)with high sensitivity and high speed using spectral-domain low-coherence interferometry(SD-LCI).To address the limit in measuring such a large range by using SD-LCI,we propose a full-range method to recognize the positive and negative *** reference arm length is changed synchronously with the shift of the focal point of the probing *** system provides a composite depth range that is sufficient to cover the whole *** demonstrate the performance of the presented system by measuring the ALs of five *** system can provide the A-scan ocular biometric assessment of the corneal thickness and AL in 0.1 s.

关键词： 170.4500 Optical coherence tomography 170.4460 Ophthalmic optics and devices

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In silico cancer drug screening based on microRNAs regulationnetworks

In silico cancer drug screening based on microRNAs regulatio...

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第五届全国生物信息学与系统生物学学术大会暨国际生物信息学前沿研讨会高通量时代的生物信息学与系统生物学

作者： lida zhu Fengji Liang Juan Liu Yinghui Li Jianghui Xiong Computer School Wuhan University Bioinformatics Group and Data Coordination Center State Key Lab of Space Medicine Fundamentals and Application(SMFA)China Astronaut Research and Training Center(ACC) Computer School Wuhan UniversityChina

Background:Severalstudies,such as the Connectivity Map(CMAP),showed that gene expression profiles could reflect drug perturbationeffects,and can be used in drug screening and drug *** we introduced a concept CoMi(Context-Specific miRNA Activity),and provide a novel perspective on drug mechanisms of *** this work,we intend to construct a virtual drug screening system and test whether CoMi could be used to capture the common features of approved cancer drugs and discriminate them from other candidate chemicals. Methods & Results:(l)We used correlation analysisby integrating the drugsensitive data(GI50) with gene expression datafrom diverse cancer cell lines in NCI60 datasets,and generated the drug sensitivity gene *** calculating the overlap rate between the drug sensitivity gene sets with disregulated gene set in breast cancer,we defined a drug-disease association index andgenerated a pool of 445 breast cancer associated compounds,including 61 positive drugs(approved breast cancer drugs) and 384 negative drugs.(2)Using the most significant differential CoMi features in positive *** drugs,a NaiveBayesian classifier could accurately predict the successful breast cancer drugs(AUC 0.86),and its performance was significantly exceed the mRNA signature based drug screening system (AUC 0.75),far superior to naive CMAP screening system(AUC0.56).(3)Further analysis of the network consisted of CoMi with good classification performance,highlighted some high connected miRNA nodes,including important cancer-related miRNAs(mir-495) and tumor suppressormiRNA(mir-520d);In addition,a number of high connectivity functional gene setsare also closely related with the biological processes of cancer(for example,cell differentiation).(4)Integrating differential expressed CoMi induced by Paclitaxel with breast cancer specific CoMi,weexaminedits application on classifying drug responsiveness in a breast cancer cohort using paclitaxel as neoadjuvant thera

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基于域扩展因子和微凸体相互作用的结合面接触刚度模型研究

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机械工程学报 2018年第19期54卷 88-95页

作者：王润琼朱立达朱春霞东北大学机械工程与自动化学院沈阳110819 沈阳建筑大学机械工程学院沈阳110168

结合面接触刚度直接影响了机械设备的整机动态特性,为了建立更为准确的接触刚度模型,以分形几何理论为基础,利用单一微凸体承受局部载荷时的弹性变形特性,并基于域扩展因子引入微接触截面积分布函数,推导了考虑表面微凸体相互作用影响... 详细信息

结合面接触刚度直接影响了机械设备的整机动态特性,为了建立更为准确的接触刚度模型,以分形几何理论为基础,利用单一微凸体承受局部载荷时的弹性变形特性,并基于域扩展因子引入微接触截面积分布函数,推导了考虑表面微凸体相互作用影响的结合面接触刚度分形模型。为了验证所提出模型的准确性,通过三维非接触式测量,获得了试验试样的表面轮廓数据,并根据结构函数法,计算了各个试样的表面分形参数,进而将理论接触刚度与试验结果对比分析,结果表明:法向接触刚度的增长速率与粗糙面表面临界接触面积有关,临界接触面积决定了结合面内的弹性变形占比。考虑微凸体相互作用后,所提出模型的预测曲线更加符合试验中法向载荷与接触刚度的关系。

关键词：微凸体相互作用结合面接触刚度分形理论

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Spectral domain optical coherence tomography with sub-micrometer sensitivity for measurement of central corneal thickness

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Chinese Optics Letters 2019年第4期17卷 84-88页

作者： lida zhu Yi Wang Yi Yuan Hongxian Zhou Yuqian Zhao Zhenhe Ma School of Electrical Engineering Yanshan University School of Control Engineering Northeastern University at Qinhuangdao Experiment Education Center Northeastern University at Qinhuangdao

We demonstrated a method for measurement of central corneal thickness(CCT) with a sub-micrometer sensitivity using a spectral domain optical coherence tomography system without needing a super broad bandwidth light source. By combining the frequency and phase components of Fourier transform, the method is capable of measurement of a large dynamic range with a high sensitivity. Absolute phases are retrieved by comparing the correlations between the detected and simulated interference fringes. The phase unwrapping ability of the present method was quantitatively tested by measuring the displacement of a piezo linear stage. The human CCTs of six volunteers were measured to verify its clinical application. It provides a potential tool for clinical diagnosis and research applications in ophthalmology.

关键词： measurement of central coherence tomography applications in ophthalmology

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基于MCKD和改进HHT多尺度模糊熵的齿轮故障诊断方法

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制造技术与机床 2020年第3期 114-118,154页

作者：朱立达吉林工业职业技术学院机电与智能技术学院吉林吉林132013

针对齿轮故障信号常伴有大量噪声,故障特征难以提取的问题,提出一种基于最大相关峭度解卷积(MCKD)和改进希尔伯特-黄变换(HHT)多尺度模糊熵的故障诊断方法。首先采用MCKD算法对采集到的齿轮振动信号进行降噪处理,以提高信号的信噪比;然... 详细信息

针对齿轮故障信号常伴有大量噪声,故障特征难以提取的问题,提出一种基于最大相关峭度解卷积(MCKD)和改进希尔伯特-黄变换(HHT)多尺度模糊熵的故障诊断方法。首先采用MCKD算法对采集到的齿轮振动信号进行降噪处理,以提高信号的信噪比;然后利用自适应白噪声完备经验模态分解(CEEMDAN)对降噪后信号进行分解,获得一系列不同尺度的固有模态函数(IMF),并通过相关系数-能量的虚假IMF评价方法选取对故障敏感的模态分量;最后计算敏感IMF分量的模糊熵,将获得的原信号多尺度的模糊熵作为状态特征参数输入最小二乘支持向量机(LS-SVM)中,对齿轮的故障类型进行诊断。实测信号的诊断结果表明,该方法可实现齿轮故障的有效诊断。

关键词：最大相关峭度解卷积自适应白噪声完备经验模态分解多尺度模糊熵齿轮故障诊断

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利用MSFlexGrid控件建立、编辑Fuzzy规则库

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计算机应用研究 2000年第5期17卷 101-102页

作者：马莉朱理达郑州轻工业学院计算机系郑州450002 郑州轻工业学院图书馆郑州450002

介绍一种利用ＭＳＦｌｅｘＧｒｉｄ控件以及动态加入的弹出式菜单建立和编辑Ｆｕｚｚｙ规则库的软件方法．该方法的优点在于将ＭＳＦｌｅｘＧｒｉｄ控件的数据工作表的直观显示和弹出式菜单的灵活编辑性能相结合，提供了便捷、灵活、... 详细信息

介绍一种利用ＭＳＦｌｅｘＧｒｉｄ控件以及动态加入的弹出式菜单建立和编辑Ｆｕｚｚｙ规则库的软件方法．该方法的优点在于将ＭＳＦｌｅｘＧｒｉｄ控件的数据工作表的直观显示和弹出式菜单的灵活编辑性能相结合，提供了便捷、灵活、可视的模糊控制规则库的建立编辑方式，同时还讨论了面向对象知识库建立技术，在智能控制系统开发中具有重要意义。

关键词： Fuzzy规则库 MSFlexGrid控件模糊控制

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