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国家自然科学基金(51021064)

作品数:23 被引量:98H指数:6
相关作者:陈大融汪家道封贝贝孟永钢豆照良更多>>
相关机构:清华大学更多>>
发文基金:国家自然科学基金中国博士后科学基金国家科技重大专项更多>>
相关领域:理学机械工程金属学及工艺交通运输工程更多>>

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23 条 记 录,以下是 1-10
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Optimal Design of a Main Driving Mechanism for Servo Punch Press Based on Performance Atlases被引量:7
2013年
The servomotor drive turret punch press is attracting more attentions and being developed more intensively due to the advantages of high speed,high accuracy,high flexibility,high productivity,low noise,cleaning and energy saving.To effectively improve the performance and lower the cost,it is necessary to develop new mechanisms and establish corresponding optimal design method with uniform performance indices.A new patented main driving mechanism and a new optimal design method are proposed.In the optimal design,the performance indices,i.e.,the local motion/force transmission indices ITI,OTI,good transmission workspace good transmission workspace(GTW) and the global transmission indices GTIs are defined.The non-dimensional normalization method is used to get all feasible solutions in dimensional synthesis.Thereafter,the performance atlases,which can present all possible design solutions,are depicted.As a result,the feasible solution of the mechanism with good motion/force transmission performance is obtained.And the solution can be flexibly adjusted by designer according to the practical design requirements.The proposed mechanism is original,and the presented design method provides a feasible solution to the optimal design of the main driving mechanism for servo punch press.
ZHOU YanhuaXIE FuguiLIU Xinjun
磁头面内运动的测量与抑制
2012年
为了进一步提高读写头的定位精度,实验研究了磁头稳定飞行时的面内运动.在将主轴系统与磁头加载机构分离开后,利用激光多普勒测振仪测量磁头面内运动和盘片偏摆大小,通过幅值谱对测量信号进行频谱分析,讨论了面内运动与盘片偏摆的相关性.结果表明,磁头面内运动主要是由盘片偏摆引起的,其运动幅值与盘片偏摆的幅度呈正相关,当偏摆幅值从6.962 4μm减小到3.333 0μm时,偏离磁道方向的运动振幅从140.6 nm降低到59.1 nm.通过抑制盘片的偏摆幅度可以有效地抑制磁头偏离磁道方向的运动幅值,有助于提高磁头定位的精确度.
宋南海孟永钢
关键词:硬盘
Wear of Silicon MEMS Devices
<正>Introduction Wear is the most challenging problem with the micro-electromechanical systems(MEMS).Most of th...
Sihan Shen
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Asymmetric Ni/PVC Films for High-performance Electromagnetic Interference Shielding
2015年
A novel asymmetric Ni/PVC film has been developed by solution casting method. The structure, electrical conductivity, electromagnetic interference (EMI) shielding, and impact resistance were investigated. The results showed that the Ni particles were asymmetrically distributed along the thickness direction in the film. The top surface resistivity increased with film thickness, while the bottom surface exhibited the different trend. EMI shielding effectiveness (SE) depended on formation of closed packed conductive Ni network, which was influenced by both Ni content and film thickness. A linear relationship was observed between EMI SE and film thickness. The films with lower Ni content showed the faster increasing rate of EMI SE with film thickness. Some of the films show appreciably high EMI SE (〉 40 dB), indicating the promising application in EMI shielding field. Moreover, the films exhibit different impact performance under different impacting directions. All the experimental facts demonstrate that the asymmetric structure endows the film achieving high-performance EMI shielding function.
张扬Xiao-xia Fang温变英
纳米级润滑膜分子排列取向的拉曼光谱表征技术被引量:1
2011年
利用激光拉曼散射技术,对剪切作用下受限于钢球与石英盘之间的纳米级液晶5CB的分子排列取向进行研究.结果表明,在特定的实验条件下,可以得到高信噪比的纳米级润滑膜的拉曼散射信号(20∶1).同时发现,当激光偏振方向与剪切运动方向平行(垂直)时,所得拉曼信号强度达到最大(小)值,表明纳米级液晶5CB分子在剪切诱导作用下,沿剪切运动方向趋于定向排列.另外,当钢球与石英盘之间的剪切速度逐渐增大时,受限的纳米级液晶5CB的拉曼信号强度也逐渐增大.最后,利用根据相对光强干涉原理研制的纳米膜厚测量仪对纳米级液晶5CB润滑膜的膜厚值进行了初步测试与分析.
张洪玉张韶华梁鹤刘宇宏雒建斌
关键词:薄膜润滑拉曼散射
Preparation of poly (N-isopropylacrylamide) brush bonded on silicon substrate and its water-based lubricating property被引量:10
2012年
The poly (N-isopropylacrylamide) brush was covalently bonded on an initiator-coated silicon wafer via surface-initiated atom transfer radical polymerization. The polymer brush was (76.2±0.1) nm in thickness (by ellipsometer) with a grafting density of ca. 0.27 chains/nm 2 . The tribological properties of the poly (N-isopropylacrylamide) brush were investigated by means of ball-on-disk tests in a rotational mode under water lubrication for tribological application. The experimental results exhibited a low friction coefficient of ca. 0.03. The excellent lubrication property of the brush was due to its amide groups in the polymer chains. It was supposed that the good lubrication property of the brush was attributed to the cross-linked polymer network formed by the hydrogen bond association of N-H…O==C and the water molecular layer adsorbed by the terminal amide groups in the brush. The poly (N-isopropylacrylamide) solution also exhibits a lubrication property due to physical adsorption of the polymer chains.
LIU YuHongXIAO YuQiLUO JianBin
Effect of polyalkylene glycols(PAGs) on the copper chemical mechanical polishing(CMP)
<正>Introduction Chemical mechanical polishing(CMP) was invented in the early 1980s at IBM and has become a sta...
Dai Y J
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化学机械抛光传输机器人晶圆抓取自适应控制方法
2012年
针对化学机械抛光装备中晶圆位置变化时传输机器人无法有效进行抓取的问题,提出了一种化学机械抛光传输机器人晶圆抓取自适应控制方法.机械手在对化学机械抛光设备工位上晶圆进行抓取时,使用先进的红外传感器测量晶圆位置和偏差,并进行实时位置补偿,从而实现机械手对工位上晶圆抓取的自适应能力,提高了化学机械抛光装备效率和可靠性.仿真实验验证了系统的有效性.
赵建伟路新春何永勇
关键词:化学机械抛光自适应晶圆补偿控制
化学机械抛光传输机器人模型及LQ控制
2012年
针对具有七自由度化学机械抛光传输机器人(CMPTR),运用拉格朗日方程和牛顿力学相结合的方法,建立非线性系统CMPTR的动力学模型.对模型进行泰勒级数展开,并线性化得CMPTR状态空间方程,便于使用LQ最优控制对其进行控制.其中性能指标是由各状态量的累积运动误差与控制量的代数和构成,通过寻找一条最优控制律使其最小,从而使CMPTR的精度和控制能量消耗都取得满意效果.仿真实验验证了系统的稳定性,也验证了系统建模和LQ控制器设计的合理性和有效性.
赵建伟路新春何永勇
关键词:化学机械抛光动力学建模线性二次型最优控制
Recent advances in gecko adhesion and friction mechanisms and development of gecko-inspired dry adhesive surfaces被引量:13
2013年
The remarkable ability of geckos to climb and run rapidly on walls and ceilings has recently received considerable interest from many researchers.Significant progress has been made in understanding the attachment and detachment mechanisms and the fabrication of articulated gecko-inspired adhesives and structured surfaces.This article reviews the direct experiments that have investigated the properties of gecko hierarchical structures,i.e.,the feet,toes,setae,and spatulae,and the corresponding models to ascertain the mechanical principles involved.Included in this review are reports on gecko-inspired surfaces and structures with strong adhesion forces,high ratios of adhesion and friction forces,anisotropic hierarchical structures that give rise to directional adhesion and friction,and“intelligent”attachment and detachment motions.
Ming ZHOUNoshir PESIKAHongbo ZENGYu TIANJacob ISRAELACHVILI
关键词:SETAE
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