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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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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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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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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)
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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
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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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The effect of SiC whisker on the performances of Al2O3matrixceramics mould for hollow turbine blade EI Scopus
会议论文 | 2013 , 85-87 | 2013 IEEE International Symposium on Assembly and Manufacturing, ISAM 2013
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Abstract :

To improve the room-temperature and medium-temperature bending strengths of Al2O3 matrix ceramic mould for hollow turbine blade, SiC whisker was added. The samples' microstructure and phase were tested by Scanning Electron Microscope and X-Ray Diffraction, the relationship between the bending strength and phase were mainly analyzed. The result shows that the room-temperature bending strength of pre-sintering samples at 1250°C was respectively 19.6MPa and 54.75MPa when the content of SiC whisker was 4wt% and 8wt%. The medium-temperature bending strength of samples was respectively 1.56MPa to 0.91Mpa and 1.85MPa to 1.02MPa when the content of SiC whisker was 4wt% and 8wt% during 400°C to 600°C, and was the lowest at 500°C. After pre-sintering at 1250°C, the shrinkage of the samples with 4wt% and 8wt% SiC whisker was -0.06% and 0.7% respectively. It is possible to fabricate high-performance Al2O3 matrix ceramic mould for hollow turbine blade. © 2013 IEEE.

Keyword :

Ceramic mould Medium temperature SiC whisker Turbine blade

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GB/T 7714 Lu, Z.L. , Fan, Y.X. , Yang, D.S. et al. The effect of SiC whisker on the performances of Al2O3matrixceramics mould for hollow turbine blade [C] . 2013 : 85-87 .
MLA Lu, Z.L. et al. "The effect of SiC whisker on the performances of Al2O3matrixceramics mould for hollow turbine blade" . (2013) : 85-87 .
APA Lu, Z.L. , Fan, Y.X. , Yang, D.S. , Li, D.C. . The effect of SiC whisker on the performances of Al2O3matrixceramics mould for hollow turbine blade . (2013) : 85-87 .
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Fluid-structure interaction analysis method for pressure compensating emitter EI Scopus CSCD PKU
期刊论文 | 2013 , 29 (2) , 30-36 | Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
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Abstract :

Pressure compensating emitter (PCE) can maintain a constant flow rate over a wide range of working pressures, and has extensive application prospect in mountain regions where there are often great changes of hydraulic pressure in conduit pipe. The rapid design method for non-pressure-compensating emitter based on CFD is a quite mature technology at present. However, as there is two-way coupled interaction between fluid flow and elastic diaphragm in the PCE, the common CFD method is not suitable for the flow rate prediction in the design of PCE. In order to improve the design accuracy and efficiency of PCE, the fluid-structure interaction (FSI) analysis method was studied in this paper. In addition, hydraulic performance tests were carried out to verify the FSI analysis results with the test samples by rapid prototyping and manufacturing (RP&M). There are two major difficulties in the FSI analysis of PCE: 1) Distortion of the fluid mesh in a confined space caused by the deformation of diaphragm may lead to termination of the analysis; 2) It is difficult to obtain the convergent result because of the nonlinearity including the material nonlinearity of the rubber diaphragm, the geometric nonlinearity of the diaphragm's large deformation and the state nonlinearity of the contact between diaphragm and emitter's main body. And moreover, the coupled fluid-structure equation is a nonlinear system. Thus an adaptive mesh repair technique was adopted to refine the distorted fluid mesh and incremental method and displacement-pressure finite element formulation was used for the nonlinear analysis of the incompressible material. In this paper, SST K-ω turbulence model was used for the fluid analysis, contact analysis method and Neo-Hookean Mooney-Rivlin rubber material model was adopted for the structure analysis. The working process of PCE can be obtained through the FSI analysis result. The results shows that when the distance between the diaphragm and the outlet of pressure-compensating (PC) chamber is small enough (smaller than 0.03mm in this paper), the flow rate of PCE tends to be stable with increasing the working pressure, which means that the flow rate will be adjusted by a very small deformation of the diaphragm to reach a steady state. The flow rate is so sensitive to the deformation of diaphragm that high calculating accuracy for the displacement of the structure analysis is required and element sizes in the region between diaphragm and outlet of PC chamber must be small enough. The displacement tolerance that controls the convergence of the coupled system is also required to be small enough (the relative residual is smaller than 0.0005 in this paper). So the design accuracy of PCE can be ensured by the high accuracy analysis results and indicates that diaphragm with good quality is necessary in PCE design. At last, compared with the test results, the analyzed flow rates were a little larger with the maximum relative deviation smaller than 2.5%. This research verifies that the FSI analysis method could predict the flow rate of PCE accurately under working pressures and the FSI analysis method can improve the design accuracy and reduce test times for rapid design of PCE.

Keyword :

Accuracy analysis Adaptive meshes Analysis method Application prospect Calculating accuracy CFD method Confined space Constant flow rates Contact analysis Coupled interaction Coupled systems Elastic diaphragms Element sizes Emitter Finite element formulations Fluid analysis Fluid-structure interaction analysis Fluid-structures Geometric non-linearity Hydraulic performance Hydraulic pressure Incompressible material Incremental method Large deformations Main bodies Material non-linearity Mountain regions Pressure compensating Rapid design Rapid prototyping and manufacturing Rate predictions Relative deviations Rubber material Small deformations Steady state Structure analysis Test samples Working pressures Working process

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GB/T 7714 Zhou, Xing , Wei, Zhengying , Yuan, Weijing et al. Fluid-structure interaction analysis method for pressure compensating emitter [J]. | Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering , 2013 , 29 (2) : 30-36 .
MLA Zhou, Xing et al. "Fluid-structure interaction analysis method for pressure compensating emitter" . | Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering 29 . 2 (2013) : 30-36 .
APA Zhou, Xing , Wei, Zhengying , Yuan, Weijing , Wang, Lipeng . Fluid-structure interaction analysis method for pressure compensating emitter . | Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering , 2013 , 29 (2) , 30-36 .
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BACK PROPAGATION NEURAL NETWORK MODEL FOR TEMPERATURE AND HUMIDITY COMPENSATION OF A NON DISPERSIVE INFRARED METHANE SENSOR EI SCIE Scopus
期刊论文 | 2013 , 41 (6) , 608-618 | INSTRUMENTATION SCIENCE & TECHNOLOGY | IF: 0.8
WoS CC Cited Count: 4
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Abstract :

The infrared absorption gas sensor detects CH4, CO, CO2, and other gases accurately and rapidly. However, temperature and humidity have a great impact on the gas sensor's performance. This article studied the response of an infrared methane gas sensor under different temperatures and humidity conditions. After analyzing the compensation methods, a back propagation neural network was chosen to compensate the nonlinear error caused by temperature and humidity. The optimal parameters of the neural network are reported in this article. After the compensation, the mean error of the gas sensor's output was between 0.02-0.08 vol %, and the maximum relative error dropped to 8.33% of the relative error before compensation. The results demonstrated that the back propagation neural network is an effective method to eliminate the influence of temperature and humidity on infrared methane gas sensors.

Keyword :

methane gas detection temperature and humidity compensation neural network NDIR infrared

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GB/T 7714 Wang, Hairong , Zhang, Wei , You, Liudong et al. BACK PROPAGATION NEURAL NETWORK MODEL FOR TEMPERATURE AND HUMIDITY COMPENSATION OF A NON DISPERSIVE INFRARED METHANE SENSOR [J]. | INSTRUMENTATION SCIENCE & TECHNOLOGY , 2013 , 41 (6) : 608-618 .
MLA Wang, Hairong et al. "BACK PROPAGATION NEURAL NETWORK MODEL FOR TEMPERATURE AND HUMIDITY COMPENSATION OF A NON DISPERSIVE INFRARED METHANE SENSOR" . | INSTRUMENTATION SCIENCE & TECHNOLOGY 41 . 6 (2013) : 608-618 .
APA Wang, Hairong , Zhang, Wei , You, Liudong , Yuan, Guoying , Zhao, Yulong , Jiang, Zhuangde . BACK PROPAGATION NEURAL NETWORK MODEL FOR TEMPERATURE AND HUMIDITY COMPENSATION OF A NON DISPERSIVE INFRARED METHANE SENSOR . | INSTRUMENTATION SCIENCE & TECHNOLOGY , 2013 , 41 (6) , 608-618 .
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