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Kinematic error separation on five-axis NC machine tool based on telescoping double ball bar
Min WANG, Jianzhong HU, Tao ZAN
《机械工程前沿(英文)》 2010年 第5卷 第4期 页码 431-437 doi: 10.1007/s11465-010-0110-1
关键词: error modeling error separation telescoping double ball bar five-axis numerical control (NC) machining tool
Kirsten BOBZIN, Lidong ZHAO, Thomas SCHLAEFER, Thomas WARDA
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 176-181 doi: 10.1007/s11465-011-0220-4
High-energy ball milling is an effective method to produce nanocrystalline oxides. In this study, a conventional ZrO2-7%Y2O3spray powder was ball-milled to produce nanocrystalline powders with high levels of crystalline disorders for deposition of thermal barrier coatings. The powder was milled both with 100Cr6 steel balls and with ZrO2-3%Y2O3 ceramic balls as grinding media. The milling time was varied in order to investigate the effect of the milling time on the crystallite size. The powders were investigated in terms of their crystallite sizes and morphologies by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that under given milling conditions the powder was already nanostructured after 40 min milling. The crystallite size decreased significantly with increasing milling time within first 120 min. After that, a further increase of milling time did not lead to a significant reduction of the crystallite size. Ball-milling led to lattice microstrains. Milling with the steel balls resulted in finer nano-sized crystal grains, but caused the contamination of the powder. The nano-sized crystal grains coarsened during the heat-treatment at 1250°C.
关键词: nanostrucured powders yttria stabilized zirconia (YSZ) high-energy ball milling thermal barrier coatings
Ultrasonic measurement of tie-bar stress for die-casting machine
《机械工程前沿(英文)》 doi: 10.1007/s11465-021-0663-1
Augmented hydrogen production by gasification of ball milled polyethylene with Ca(OH)
Giovanni Cagnetta, Kunlun Zhang, Qiwu Zhang, Jun Huang, Gang Yu
《环境科学与工程前沿(英文)》 2019年 第13卷 第1期 doi: 10.1007/s11783-019-1096-5
PE ball milling pretreatment induces higher H2 production and purity by gasification. Ca(OH)2 reacts at solid state with PE boosting H2 and capturing CO2. Ca(OH)2 significantly reduces methanation side-reaction.
关键词: Hydrogen production Gasification Plastic waste High energy ball milling
Shuchun LI, Bo DIAO, Youpo SU,
《结构与土木工程前沿(英文)》 2009年 第3卷 第4期 页码 378-383 doi: 10.1007/s11709-009-0064-8
关键词: beam with dispersed steel bar flame joints with special-shaped beam and column seismic behavior scale of dispersed steel bars
Nonlinear dynamics and analysis of a four-bar linkage with clearance
Yuanguang TANG, Zongyu CHANG, Xiaogang DONG, Yafei HU, Zhenjiang YU
《机械工程前沿(英文)》 2013年 第8卷 第2期 页码 160-168 doi: 10.1007/s11465-013-0258-6
In this paper, nonlinear dynamic behavior of a four-bar linkage considering clearance is studied. The dynamic model of the linkage with a clearance between coupler and rocker is developed firstly. Then the dynamic equations of this mechanism are solved by a numerical method. According to the calculated response, compliance, force and trajectory of pin in joint bearing are obtained. Effects of clearance magnitude and the relationship between a mechanism with clearance and without clearance are studied. By using Poincare Map, it is proved that strange attractors or chaos exist in the dynamic response. In addition, phenomena of chaos, periodic response and subharmonic response also can be found in the special condition. Bifurcation diagram is used to suggest that bifurcation and fractal phenomena exist in the dynamic response of this mechanism.
关键词: four-bar linkage chaos bifurcation strange attractors dynamics
Sandeep PANDA, Nilotpala PRADHAN, Umaballav MOHAPATRA, Sandeep K. PANDA, Swagat S. RATH, Danda S. RAO, Bansi D. NAYAK, Lala B. SUKLA, Barada K. MISHRA
《环境科学与工程前沿(英文)》 2013年 第7卷 第2期 页码 281-293 doi: 10.1007/s11783-013-0484-5
关键词: ball mill spillage thermal activation bioleaching copper
Distributed fiber optic monitoring of a CFA pile with a central reinforcement bar bundle
Yi RUI, Nicholas de BATTISTA, Cedric KECHAVARZI, Xiaomin XU, Mei YIN
《结构与土木工程前沿(英文)》 2021年 第15卷 第1期 页码 167-176 doi: 10.1007/s11709-020-0581-z
关键词: continuous flight auger pile static load test central reinforcement bar bundle distributed fiber optic sensor finite element load transfer
Numerical solution, simulation and testing of the thermal dynamic characteristics of ball-screws
XIA Junyong, HU Youmin, WU Bo, SHI Tielin
《机械工程前沿(英文)》 2008年 第3卷 第1期 页码 28-36 doi: 10.1007/s11465-008-0007-4
关键词: numerical solution temperature corresponding temperature distribution end-most ball-screw
Modeling of dynamic response of poroelastic soil layers under wave loading
Mehmet Bar?? Can üLKER
《结构与土木工程前沿(英文)》 2014年 第8卷 第1期 页码 1-18 doi: 10.1007/s11709-014-0233-2
关键词: dynamic response of soils coupled flow-deformation finite elements analytical solution harmonic waves
《结构与土木工程前沿(英文)》 2021年 第15卷 第4期 页码 834-850 doi: 10.1007/s11709-021-0743-7
关键词: steel sheet GFRP composite bar combination form numerical modeling mechanical properties test strength
Effect of friction coefficients on the dynamic response of gear systems
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
Erratum to: One-step ball milling-prepared nano Fe
Xingguo Guo, Qiuying Wang, Ting Xu, Kajia Wei, Mengxi Yin, Peng Liang, Xia Huang, Xiaoyuan Zhang
《环境科学与工程前沿(英文)》 2020年 第14卷 第4期 doi: 10.1007/s11783-020-1258-5
Experimental study on slender buckling-restrained knee braces with round steel bar cores
《结构与土木工程前沿(英文)》 2023年 第17卷 第1期 页码 99-121 doi: 10.1007/s11709-022-0875-4
关键词: weld-free beam-to-column connections moment-resisting frame cyclic and compression loading tests buckling-restrained knee brace cover tube
《结构与土木工程前沿(英文)》 2023年 第17卷 第1期 页码 122-137 doi: 10.1007/s11709-022-0894-1
关键词: precast concrete sandwich panel basalt fiber reinforced polymer pull-out performance shear performance out-of-plane flexural performance
标题 作者 时间 类型 操作
Kinematic error separation on five-axis NC machine tool based on telescoping double ball bar
Min WANG, Jianzhong HU, Tao ZAN
期刊论文
characterization of nanocrystalline ZrO2-7%Y2O3 powders for thermal barrier coatings by high-energy ball
Kirsten BOBZIN, Lidong ZHAO, Thomas SCHLAEFER, Thomas WARDA
期刊论文
Augmented hydrogen production by gasification of ball milled polyethylene with Ca(OH)
Giovanni Cagnetta, Kunlun Zhang, Qiwu Zhang, Jun Huang, Gang Yu
期刊论文
Seismic behavior experimental study of frame joints with special-shaped column and dispersed steel bar
Shuchun LI, Bo DIAO, Youpo SU,
期刊论文
Nonlinear dynamics and analysis of a four-bar linkage with clearance
Yuanguang TANG, Zongyu CHANG, Xiaogang DONG, Yafei HU, Zhenjiang YU
期刊论文
Bioleaching of copper from pre and post thermally activated low grade chalcopyrite contained ball mill
Sandeep PANDA, Nilotpala PRADHAN, Umaballav MOHAPATRA, Sandeep K. PANDA, Swagat S. RATH, Danda S. RAO, Bansi D. NAYAK, Lala B. SUKLA, Barada K. MISHRA
期刊论文
Distributed fiber optic monitoring of a CFA pile with a central reinforcement bar bundle
Yi RUI, Nicholas de BATTISTA, Cedric KECHAVARZI, Xiaomin XU, Mei YIN
期刊论文
Numerical solution, simulation and testing of the thermal dynamic characteristics of ball-screws
XIA Junyong, HU Youmin, WU Bo, SHI Tielin
期刊论文
Modeling of dynamic response of poroelastic soil layers under wave loading
Mehmet Bar?? Can üLKER
期刊论文
experimental study of mechanical properties on steel sheet glass fiber reinforced polymer composite bar
期刊论文
Erratum to: One-step ball milling-prepared nano Fe
Xingguo Guo, Qiuying Wang, Ting Xu, Kajia Wei, Mengxi Yin, Peng Liang, Xia Huang, Xiaoyuan Zhang
期刊论文