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< Page ,Total 42 >
A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds EI SCIE
期刊论文 | 2019 , 132 , 1-10 | International Journal of Heat and Mass Transfer
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Abstract :

The effective thermal conductivity (ETC) of metal powder is a basic physical property that has an important role in industrial design for metallurgical, energy, chemical, and other types of application. To obtain this information, a numerical model based on the coupled discrete element-finite difference (DE-FD) method is proposed to precisely and efficiently predict the ETC of metal powders. A random packaged aluminum powder unit influenced by the effects of gravity is piled up concerning the particle size distribution of the real powder. Moreover, a sandwich structure model is proposed to simulate the thermal dynamic behavior during directional heat transfer. Based on the amount of heat passing through the system, the effective thermal conductivity was precisely calculated in an indirect way and the results of the simulation were consistent with corresponding experimental results. Relative error was within ±5%. Thus, the proposed numerical model may be useful in predicting the ETC of the different powder beds filed using various types of interstitial gas media within a wide range of temperatures. © 2018 Elsevier Ltd

Keyword :

Aluminum powders Coupling modeling Effective thermal conductivity Powder bed Relative errors Thermal dynamics

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GB/T 7714 Zhang, Hang , Zhao, Yizhen , Wang, Fu et al. A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds [J]. | International Journal of Heat and Mass Transfer , 2019 , 132 : 1-10 .
MLA Zhang, Hang et al. "A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds" . | International Journal of Heat and Mass Transfer 132 (2019) : 1-10 .
APA Zhang, Hang , Zhao, Yizhen , Wang, Fu , Li, Dichen . A 3D discrete element-finite difference coupling model for predicting the effective thermal conductivity of metal powder beds . | International Journal of Heat and Mass Transfer , 2019 , 132 , 1-10 .
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DESIGN, DEVELOPMENT AND TESTING OF WATER-LUBRICATED CERAMIC JOURNAL BEARING EI CPCI-S Scopus
会议论文 | 2018 | ASME International Mechanical Engineering Congress and Exposition
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Abstract :

Strong shear force developed in the fluid film as the water lubricated hybrid bearing operates at high speeds. Thus the phenomena of shaft expanding outward and bearing contracting inward happened due to the increasing temperature of the fluid film caused by the friction heat. So the bearing clearance decreases on account of the thermal deformation of the shaft and the bearing. Seriously, there will be a risk of seizure accident when the speed gets higher. Friction heat may be weakened by adopting low viscosity lubricant and thermal deformation may be reduced by adopting low expansion coefficient materials. Such as the ceramic's expansion coefficient is 3-5 times smaller than that of typical journal bearing material like tin bronze. Thus, a ceramic journal bearing was developed in this paper to weaken the thermal influence on the bearing clearance. For improving the temperature rise of the journal bearing, a water-lubricated ceramic hydrodynamic hydrostatic hybrid bearing test rig was designed firstly. Considering expansion coefficient and thermal conductivity effects, the simulation method was used to study the variation of bearing clearance with the speed and the original bearing clearance. Then, the water-lubricated ceramic hydrodynamic hydrostatic hybrid bearing test rig was developed to verify the temperature characteristics at different speeds. Results indicate that the relative error of the tested temperature results and simulation results was below 10% at different speeds. Lastly, the evolution of bearing clearance with speed and the original bearing clearance was studied through FEM. The advantages of ceramic material were more obvious with the increase of the rotation speed when exceeds 8000rpm.

Keyword :

journal bearing temperature rise ceramic bearing water-lubricated

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GB/T 7714 Zha, Jun , Wang, Jianlei , Liu, Kejia et al. DESIGN, DEVELOPMENT AND TESTING OF WATER-LUBRICATED CERAMIC JOURNAL BEARING [C] . 2018 .
MLA Zha, Jun et al. "DESIGN, DEVELOPMENT AND TESTING OF WATER-LUBRICATED CERAMIC JOURNAL BEARING" . (2018) .
APA Zha, Jun , Wang, Jianlei , Liu, Kejia , Chen, Yaolong . DESIGN, DEVELOPMENT AND TESTING OF WATER-LUBRICATED CERAMIC JOURNAL BEARING . (2018) .
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KDP晶体精密切割机设计及其切割表面质量影响因素分析 PKU
期刊论文 | 2017 , (4) , 51-55 | 制造技术与机床
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Abstract :

KDP晶体具有较大的非线性光学系数和较高的激光损伤阈值,但具有易潮解和软脆特性,需要采用精密金刚石线切割实现其坯料的快速切割.基于电镀金刚石环线技术,设计了一种用于KDP晶体快速精密切割设备,能够实现切割张紧力可控可调;采用正交试验方法对200mm×200 mm的晶体进行切割试验,并通过灰色理论对影响工件平面度和粗糙度的各工艺参数,进行了动态、量化分析,试验得出各工艺因素对切割表面质量影响程度大小,确定了环线切割的最佳工艺参数.

Keyword :

金刚石切割 电镀金刚石环线 灰色理论 正交试验

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GB/T 7714 冯嫄嫄 , 李彬 , 赵惠英 et al. KDP晶体精密切割机设计及其切割表面质量影响因素分析 [J]. | 制造技术与机床 , 2017 , (4) : 51-55 .
MLA 冯嫄嫄 et al. "KDP晶体精密切割机设计及其切割表面质量影响因素分析" . | 制造技术与机床 4 (2017) : 51-55 .
APA 冯嫄嫄 , 李彬 , 赵惠英 , 班新星 , 徐世栋 , 桑杰 . KDP晶体精密切割机设计及其切割表面质量影响因素分析 . | 制造技术与机床 , 2017 , (4) , 51-55 .
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Nd∶YAG晶体高精度切割加工试验研究 PKU
期刊论文 | 2017 , (6) , 152-156 | 制造技术与机床
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Abstract :

利用环形电镀金刚石线切割机对Nd∶YAG晶体进行了切割实验研究,分析了水平和旋转切割模式对晶体切割质量的影响,得出旋转切割更适合Nd∶YAG的圆晶片加工,不仅可以提高晶体的加工表面质量,还大幅度减小了切割时间.采用正交法对旋转切割进行试验设计,研究不同切割参数对Nd∶YAG晶体切割质量的影响规律.通过对试验结果进行分析,得出环形金刚石线切割Nd∶YAG晶体的最优工艺参数,切割后的晶片经过工艺处理后可直接进行后续的抛光加工.

Keyword :

金刚石线切割机 YAG晶体 表面质量 旋转切割

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GB/T 7714 冯嫄嫄 , 赵惠英 , 徐世栋 et al. Nd∶YAG晶体高精度切割加工试验研究 [J]. | 制造技术与机床 , 2017 , (6) : 152-156 .
MLA 冯嫄嫄 et al. "Nd∶YAG晶体高精度切割加工试验研究" . | 制造技术与机床 6 (2017) : 152-156 .
APA 冯嫄嫄 , 赵惠英 , 徐世栋 , 班新星 , 刘文涛 , 李彬 . Nd∶YAG晶体高精度切割加工试验研究 . | 制造技术与机床 , 2017 , (6) , 152-156 .
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环形金刚石线锯切割镍钴合金的试验研究
期刊论文 | 2017 , (6) , 33-37 | 中原工学院学报
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Abstract :

基于环形电镀金刚石线锯切割硬脆材料的工艺特点,对张紧力、锯丝速度等切削参数进行分析并确定合理的取值范围.通过环形电镀金刚石线锯切割镍钴合金正交试验,为环形电镀金刚石线锯的工艺参数选择提供了一定依据.在测量切割工件表面粗糙度的基础上,分析了锯丝速度、张紧力和进给速度等参数对切割工件表面粗糙度的影响.结果表明:张紧力对粗糙度影响最大,张紧力越大粗糙度越小,但张紧力增大到一定值后其影响变得很小;表面粗糙度随着锯丝速度的提高而下降,但锯丝速度过高会降低锯丝使用寿命;进给速度越小则表面粗糙度越小,但过低的进给速度会降低切割效率.

Keyword :

表面粗糙度 镍钴合金 线切割 金刚石线锯

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GB/T 7714 刘文涛 , 李彬 , 赵惠英 et al. 环形金刚石线锯切割镍钴合金的试验研究 [J]. | 中原工学院学报 , 2017 , (6) : 33-37 .
MLA 刘文涛 et al. "环形金刚石线锯切割镍钴合金的试验研究" . | 中原工学院学报 6 (2017) : 33-37 .
APA 刘文涛 , 李彬 , 赵惠英 , 冯嫄嫄 , 班新星 , 赵家宁 . 环形金刚石线锯切割镍钴合金的试验研究 . | 中原工学院学报 , 2017 , (6) , 33-37 .
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机械精度设计基础
专著 | 2017-08-01 | 西安交通大学出版社
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Abstract :

本书以设计为主线,介绍了机械精度设计的基本知识,掌握公差与配合精度设计的基本原理、原则与方法,典型结合件精度设计基本知识及获取测量技术及产品质量保证的基本技能。

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GB/T 7714 蒋庄德,;苑国英 . 机械精度设计基础 [M] . 西安交通大学出版社 , . 2017-08-01 .
MLA 蒋庄德,;苑国英 . "机械精度设计基础" . 西安交通大学出版社 , . 2017-08-01 .
APA 蒋庄德,;苑国英 . 机械精度设计基础 . 西安交通大学出版社 , . 2017-08-01 .
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光栅线位移传感器精度的影响因素分析
期刊论文 | 2015 , (3) , 71-73,77 | 制造业自动化
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Abstract :

光栅位置检测系统是数控机床的重要组成部分,其测量精度直接决定了数控机床的精度。文章分析了影响光栅线位移传感器精度的因素,对刻线面机械加工质量、光栅标尺刻划环境、机械误差及温度因素对光栅标尺精度的影响进行分析,通过公式推导,曲线对比,分析了所列因素对位移传感器精度的影响大小,并针对影响因素提出了提高精度的相应措施。

Keyword :

光栅标尺 温度特性 莫尔条纹 精度

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GB/T 7714 郭晓聪 , 牛永生 , 赵惠英 et al. 光栅线位移传感器精度的影响因素分析 [J]. | 制造业自动化 , 2015 , (3) : 71-73,77 .
MLA 郭晓聪 et al. "光栅线位移传感器精度的影响因素分析" . | 制造业自动化 3 (2015) : 71-73,77 .
APA 郭晓聪 , 牛永生 , 赵惠英 , 任东旭 . 光栅线位移传感器精度的影响因素分析 . | 制造业自动化 , 2015 , (3) , 71-73,77 .
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A Digital Management System of Part Processing Parameter based on UG EI CPCI-S Scopus
会议论文 | 2014 , 2055-2059 | 11th IEEE International Conference on Mechatronics and Automation (ICMA)
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

That digital management of part parameters information is not uniform in design, manufacture and detection in digital factory construction. A unified digitization system of part parameters based on UG (Unigraphics NX) is proposed. This digital management system is established under. NET environment, and the user interface is built by C# which realizes part design, inspection planning and processes information collected based on UG. In order to unify part parameters information management in design, manufacture and detection, moreover, the SQL Server database is established for realizing uniform management of the part parameters. This digital management system Effectively improve the processing quality and efficiency.

Keyword :

database management digitalized factory digital management inspection planning UG secondary development

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GB/T 7714 Shao Wei , Liu Chong , Yue Jing et al. A Digital Management System of Part Processing Parameter based on UG [C] . 2014 : 2055-2059 .
MLA Shao Wei et al. "A Digital Management System of Part Processing Parameter based on UG" . (2014) : 2055-2059 .
APA Shao Wei , Liu Chong , Yue Jing , Wu Ying , Guo Junjie . A Digital Management System of Part Processing Parameter based on UG . (2014) : 2055-2059 .
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Efficient optimization of super-oscillatory lens and transfer function analysis in confocal scanning microscopy EI SCIE Scopus
期刊论文 | 2014 , 319 , 31-35 | OPTICS COMMUNICATIONS | IF: 1.449
WoS CC Cited Count: 5 SCOPUS Cited Count: 6
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Abstract :

Super-oscillatory lens (SOL) provides a promising way to achieve subwavelength focusing in the regime of far-field optics and realize super-resolution imaging in confocal scanning microscopy (CSM). Both binary amplitude and phase SOLs are designed with an efficient optimization method using genetic algorithm and fast Hankel transform algorithm either in oil immersion medium or in air. A much brighter hotspot is readily focused by a phase SOL compared with the amplitude counterpart, e.g., 5.8 times as bright as the latter. To fundamentally interpret the super-resolution imaging mechanism by SOL in CSM, transfer function analysis is conducted compared with basic confocal imaging. The coherent transfer function (CTF) is derived and numerically calculated. The extension of the cutoff frequency and the remarkable enhancement of the magnitude of CTF in the high frequency passband account for super-resolution imaging by SOL in CSM; however, the limited extension of the frequency domain also implies that the attainable resolution is physically limited. (c) 2014 Published by Elsevier B.V.

Keyword :

Super-resolution Binary optics Confocal microscopy Transfer function

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GB/T 7714 Liu, Tao , Liu, Jian , Zhang, He et al. Efficient optimization of super-oscillatory lens and transfer function analysis in confocal scanning microscopy [J]. | OPTICS COMMUNICATIONS , 2014 , 319 : 31-35 .
MLA Liu, Tao et al. "Efficient optimization of super-oscillatory lens and transfer function analysis in confocal scanning microscopy" . | OPTICS COMMUNICATIONS 319 (2014) : 31-35 .
APA Liu, Tao , Liu, Jian , Zhang, He , Tan, Jiubin . Efficient optimization of super-oscillatory lens and transfer function analysis in confocal scanning microscopy . | OPTICS COMMUNICATIONS , 2014 , 319 , 31-35 .
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一种加热丝埋入式微热板的研制 CSCD PKU
期刊论文 | 2013 , (10) , 99-101,113 | 传感器与微系统
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在传统“三明治”夹层结构的基础上,微热板将加热丝埋入到基底绝缘层中,通过周围绝缘层介质对加热丝的约束作用,减小了Pt加热丝与基底以及覆盖层热膨胀系数失配所产生的热应力对器件稳定性造成的影响,从而提高微热板在高温工作时的稳定性.主要加工工艺流程为:利用热氧化方法和LPCVD在4in硅片两侧制备SiO2/Si3N4介质层,在待埋入加热丝的位置通过RIE制作出坑槽,然后利用剥离工艺制备出双曲螺旋形状Pt加热丝,在硅片的背部利用RIE干法刻蚀和湿法刻蚀加工出绝热槽,最后在加热丝的上方沉积一层SiO2绝缘层并在引线盘位置开窗.通过实验验证:该微热板在350℃内可以稳定工作,微热板在有效面积内(5 mm ×5 mm)温度均匀性好,功率约为130 mW(350℃时).

Keyword :

微机电系统 低功耗 半导体式气体传感器 微热板

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GB/T 7714 丁如义 , 张欢 , 孙全涛 et al. 一种加热丝埋入式微热板的研制 [J]. | 传感器与微系统 , 2013 , (10) : 99-101,113 .
MLA 丁如义 et al. "一种加热丝埋入式微热板的研制" . | 传感器与微系统 10 (2013) : 99-101,113 .
APA 丁如义 , 张欢 , 孙全涛 , 王海容 , 陈磊 . 一种加热丝埋入式微热板的研制 . | 传感器与微系统 , 2013 , (10) , 99-101,113 .
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