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A multi-probe micro-fabrication apparatus based on the friction-induced fabrication method
Zhijiang WU, Chenfei SONG, Jian GUO, Bingjun YU, Linmao QIAN
《机械工程前沿(英文)》 2013年 第8卷 第4期 页码 333-339 doi: 10.1007/s11465-013-0276-4
A novel multi-probe micro-fabrication apparatus was developed based on the friction-induced fabrication method. The main parts of the apparatus include actuating device, loading system, and control system. With a motorized linear stage, the maximum fabrication area of 50 mm × 50 mm can be achieved, and the maximum sliding speed of probes can be as high as 10 mm/s. Through locating steel micro balls into indents array, the preparation of multi-probe array can be realized by a simple and low-cost way. The cantilever was designed as a structure of deformable parallelogram with two beams, by which the fabrication force can be precisely controlled. Combining the friction-induced scanning with selective etching in KOH solution, various micro-patterns were fabricated on Si(100) surface without any masks or exposure. As a low-cost and high efficiency fabrication device, the multi-probe micro-fabrication apparatus may encourage the development of friction-induced fabrication method and shed new light on the texture engineering.
关键词: friction-induced fabrication silicon surface texture friction multi-probe
Analysis of nonlinear channel friction inverse problem
CHENG Weiping, LIU Guohua
《结构与土木工程前沿(英文)》 2007年 第1卷 第2期 页码 205-210 doi: 10.1007/s11709-007-0024-0
Effects of leakage and friction on the miniaturization of a Wankel compressor
Yilin ZHANG, Wen WANG
《能源前沿(英文)》 2011年 第5卷 第1期 页码 83-92 doi: 10.1007/s11708-010-0125-7
Mesoscale fabrication of a complex surface for integral impeller blades
Xibin WANG,Tianfeng ZHOU,Lijing XIE,Li JIAO,Zhibing LIU,Zhiqiang LIANG,Pei YAN
《机械工程前沿(英文)》 2017年 第12卷 第1期 页码 116-131 doi: 10.1007/s11465-017-0426-1
Integral impeller is the most important component of a mini-engine. However, the machining of a mesoscale impeller with a complex integral surface is difficult because of its compact size and high accuracy requirement. A mesoscale component is usually manufactured by milling. However, a conventional milling tool cannot meet the machining requirements because of its size and stiffness. For the fabrication of a complex integral impeller, a micro-ball-end mill is designed in accordance with the non-instantaneous-pole envelope principle and manufactured by grinding based on the profile model of the helical groove and the mathematical model of the cutting edge curve. Subsequently, fractal theory is applied to characterize the surface quality of the integral impeller. The fractal theory-based characterization shows that the completed mesoscale integral impeller exhibits a favorable performance in terms of mechanical properties and morphological accuracy.
关键词: mesoscale fabrication micro-milling tool mesoscale milling impeller blade
王渭源
《中国工程科学》 2001年 第3卷 第8期 页码 29-32
当前,工程师和科学家都对微牛和纳牛量级载荷静摩擦系数(以下简称微牛纳牛静摩擦系数)很感兴趣。但文献中至今没有详细讨论过微牛纳牛静摩擦系数与载荷的关系,而且发表的实验结果都不相互讨论。从微分静摩擦系数的定义出发,导出几种典型模型下微分静摩擦系数和表观静摩擦系数的表式,并据此广泛讨论这些文献中的实验结果。
Air-side heat transfer and friction characteristics of biofouled evaporator under wet conditions
Hui PU, Guoliang DING, Xiaokui MA, Haitao HU, Yifeng GAO,
《能源前沿(英文)》 2010年 第4卷 第3期 页码 306-312 doi: 10.1007/s11708-009-0067-0
Modeling of the minimum cutting thickness in micro cutting with consideration of the friction around
Tianfeng ZHOU, Ying WANG, Benshuai RUAN, Zhiqiang LIANG, Xibin WANG
《机械工程前沿(英文)》 2020年 第15卷 第1期 页码 81-88 doi: 10.1007/s11465-019-0561-y
关键词: tool friction minimum cutting thickness finite element method tool edge radius micro cutting
Study of base friction simulation tests based on a complicated engineered bridge slope
Liu HE, Guang WU, Hua WANG
《结构与土木工程前沿(英文)》 2012年 第6卷 第4期 页码 393-397 doi: 10.1007/s11709-012-0174-6
关键词: base friction test slope stability evaluation bridge slope
Parametric study on the Multangular-Pyramid Concave Friction System (MPCFS) for seismic isolation
Wei XIONG, Shan-Jun ZHANG, Li-Zhong JIANG, Yao-Zhuang LI
《结构与土木工程前沿(英文)》 2020年 第14卷 第5期 页码 1152-1165 doi: 10.1007/s11709-020-0659-7
关键词: seismic isolation variable frequency near-fault earthquake numerical study Multangular-Pyramid Concave Friction System
Laboratory and field evaluation of asphalt pavement surface friction resistance
Zhong WU, Chris ABADIE
《结构与土木工程前沿(英文)》 2018年 第12卷 第3期 页码 372-381 doi: 10.1007/s11709-017-0463-1
Pavement surface friction is a significant factor for driving safety and plays a critical role in reducing wet-pavement crashes. However, the current asphalt mixture design procedure does not directly consider friction as a requirement. The objective of this study was to develop a surface friction prediction model that can be used during a wearing course mixture design. To achieve the objective, an experimental study was conducted on the frictional characteristics of typical wearing course mixtures in Louisiana. Twelve wearing course mixtures including dense-graded and open-graded mixes with different combinations of aggregate sources were evaluated in laboratory using an accelerated polishing and testing procedure considering both micro- and macro texture properties. In addition, the surface frictional properties of asphalt mixtures were measured on twenty-two selected asphalt pavement sections using different in situ devices including Dynamic Friction Tester (DFT), Circular Texture Meter (CTM), and Lock-Wheel Skid Trailer (LWST). The results have led to develop a procedure for predicting pavement end-of-life skid resistance based on the aggregate blend polish stone value, gradation parameters, and traffic, which is suited in checking whether the selected aggregates in a wearing course mix design would meet field friction requirements under a certain design traffic polishing.
关键词: friction skid resistance polishing PSV LWST micro-texture macro-texture
Subhash ANURAG, Yuebin GUO,
《机械工程前沿(英文)》 2010年 第5卷 第3期 页码 247-255 doi: 10.1007/s11465-010-0097-7
关键词: surface temperature friction residual stress finite element analysis (FEA) dry cutting tool property
Effect of friction coefficients on the dynamic response of gear systems
Lingli JIANG, Zhenyong DENG, Fengshou GU, Andrew D. BALL, Xuejun LI
《机械工程前沿(英文)》 2017年 第12卷 第3期 页码 397-405 doi: 10.1007/s11465-017-0415-4
The inevitable deterioration of the lubrication conditions in a gearbox in service can change the tribological properties of the meshing teeth. In turn, such changes can significantly affect the dynamic responses and running status of gear systems. This paper investigates such an effect by utilizing virtual prototype technology to model and simulate the dynamics of a wind turbine gearbox system. The change in the lubrication conditions is modeled by the changes in the friction coefficients, thereby indicating that poor lubrication causes not only increased frictional losses but also significant changes in the dynamic responses. These results are further demonstrated by the mean and root mean square values calculated by the simulated responses under different friction coefficients. In addition, the spectrum exhibits significant changes in the first, second, and third harmonics of the meshing components. The findings and simulation method of this study provide theoretical bases for the development of accurate diagnostic techniques.
关键词: dynamic response friction coefficient wind loads wind turbine gearbox
Precision glass molding: Toward an optimal fabrication of optical lenses
Liangchi ZHANG,Weidong LIU
《机械工程前沿(英文)》 2017年 第12卷 第1期 页码 3-17 doi: 10.1007/s11465-017-0408-3
It is costly and time consuming to use machining processes, such as grinding, polishing and lapping, to produce optical glass lenses with complex features. Precision glass molding (PGM) has thus been developed to realize an efficient manufacture of such optical components in a single step. However, PGM faces various technical challenges. For example, a PGM process must be carried out within the super-cooled region of optical glass above its glass transition temperature, in which the material has an unstable non-equilibrium structure. Within a narrow window of allowable temperature variation, the glass viscosity can change from 105 to 1012 Pa·s due to the kinetic fragility of the super-cooled liquid. This makes a PGM process sensitive to its molding temperature. In addition, because of the structural relaxation in this temperature window, the atomic structure that governs the material properties is strongly dependent on time and thermal history. Such complexity often leads to residual stresses and shape distortion in a lens molded, causing unexpected changes in density and refractive index. This review will discuss some of the central issues in PGM processes and provide a method based on a manufacturing chain consideration from mold material selection, property and deformation characterization of optical glass to process optimization. The realization of such optimization is a necessary step for the Industry 4.0 of PGM.
关键词: precision glass molding optical lens constitutive modeling optimization manufacturing chain Industry 4.0
Biranchi PANDA,A. GARG,Zhang JIAN,Akbar HEIDARZADEH,Liang GAO
《机械工程前沿(英文)》 2016年 第11卷 第3期 页码 289-298 doi: 10.1007/s11465-016-0393-y
Friction stir welding (FSW) process has gained attention in recent years because of its advantages over the conventional fusion welding process. These advantages include the absence of heat formation in the affected zone and the absence of large distortion, porosity, oxidation, and cracking. Experimental investigations are necessary to understand the physical behavior that causes the high tensile strength of welded joints of different metals and alloys. Existing literature indicates that tensile properties exhibit strong dependence on the rotational speed, traverse speed, and axial force of the tool that was used. Therefore, this study introduces the experimental procedure for measuring tensile properties, namely, ultimate tensile strength (UTS) and tensile elongation of the welded AA 7020 Al alloy. Experimental findings suggest that a welded part with high UTS can be achieved at a lower heat input compared with the high heat input condition. A numerical approach based on genetic programming is employed to produce the functional relationships between tensile properties and the three inputs (rotational speed, traverse speed, and axial force) of the FSW process. The formulated models were validated based on the experimental data, using the statistical metrics. The effect of the three inputs on the tensile properties was investigated using 2D and 3D analyses. A high UTS was achieved, including a rotational speed of 1050 r/min and traverse speed of 95 mm/min. The results also indicate that 8 kN axial force should be set prior to the FSW process.
关键词: tensile properties ultimate tensile strength tensile elongation friction stir welding tool rotational speed genetic programming welding speed
Interfacial potential barrier theory of friction and wear
XU Zhongming, DING Lingyun, HUANG Ping, XU Zhongming
《机械工程前沿(英文)》 2008年 第3卷 第3期 页码 276-282 doi: 10.1007/s11465-008-0043-0
关键词: coefficient standard interfacial interaction formulas calculation
标题 作者 时间 类型 操作
A multi-probe micro-fabrication apparatus based on the friction-induced fabrication method
Zhijiang WU, Chenfei SONG, Jian GUO, Bingjun YU, Linmao QIAN
期刊论文
Effects of leakage and friction on the miniaturization of a Wankel compressor
Yilin ZHANG, Wen WANG
期刊论文
Mesoscale fabrication of a complex surface for integral impeller blades
Xibin WANG,Tianfeng ZHOU,Lijing XIE,Li JIAO,Zhibing LIU,Zhiqiang LIANG,Pei YAN
期刊论文
Air-side heat transfer and friction characteristics of biofouled evaporator under wet conditions
Hui PU, Guoliang DING, Xiaokui MA, Haitao HU, Yifeng GAO,
期刊论文
Modeling of the minimum cutting thickness in micro cutting with consideration of the friction around
Tianfeng ZHOU, Ying WANG, Benshuai RUAN, Zhiqiang LIANG, Xibin WANG
期刊论文
Study of base friction simulation tests based on a complicated engineered bridge slope
Liu HE, Guang WU, Hua WANG
期刊论文
Parametric study on the Multangular-Pyramid Concave Friction System (MPCFS) for seismic isolation
Wei XIONG, Shan-Jun ZHANG, Li-Zhong JIANG, Yao-Zhuang LI
期刊论文
Laboratory and field evaluation of asphalt pavement surface friction resistance
Zhong WU, Chris ABADIE
期刊论文
Predictive model to decouple the contributions of friction and plastic deformation to machined surface
Subhash ANURAG, Yuebin GUO,
期刊论文
Effect of friction coefficients on the dynamic response of gear systems
Lingli JIANG, Zhenyong DENG, Fengshou GU, Andrew D. BALL, Xuejun LI
期刊论文
Precision glass molding: Toward an optimal fabrication of optical lenses
Liangchi ZHANG,Weidong LIU
期刊论文
Characterization of the tensile properties of friction stir welded aluminum alloy joints based on axial
Biranchi PANDA,A. GARG,Zhang JIAN,Akbar HEIDARZADEH,Liang GAO
期刊论文