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2013 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale最新文献

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The study on the effect of step time on the movement of the cross-scale stage based on the stick-slip driving 基于粘滑驱动的跨尺度台阶运动的步长影响研究
Bowen Zhong, Zhenhua Wang, Tao Chen, Liguo Chen, Lining Sun
In this paper, the relationship of the movement of stick-slip driving and the step time was studied. Firstly, the research status and the principle of stick-slip driving was introduced. Secondly, the math model of the every step displacement and velocity of stick-slip driving was built. By using mathematical models, the relationship curve of the every step displacement and the step time was received through the simulation in Matlab software. Furthermore, in corroboration of the math model, the prototype was designed and the experiment system was built. From the testing of stick-slip prototype, the step displacement in every step time was tested 20 times and the relationship curve of the average every step displacement and step time was obtained. The simulation results are validated by the testing results and the method of reducing the time step to adjust the stick-slip driving step displacement and velocity were proved. In the future, a greater drive power should be researched for improving the movement performance of the stick-slip driving.
本文研究了粘滑传动的运动与步进时间的关系。首先介绍了粘滑传动的研究现状和原理。其次,建立了粘滑驱动各阶位移和速度的数学模型;利用数学模型,在Matlab软件中进行仿真,得到了各阶位移与阶跃时间的关系曲线。为验证数学模型,设计了样机并搭建了实验系统。在粘滑样机试验的基础上,对各阶跃位移进行了20次试验,得到了各阶跃位移与阶跃时间的平均关系曲线。仿真结果与试验结果相吻合,验证了减小时间步长调整粘滑驱动步长位移和速度的方法。今后应研究更大的驱动功率,以提高粘滑传动的运动性能。
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引用次数: 2
New Yθ compliant micromanipulator with ultra-large workspace for biomanipulations 具有超大工作空间的新型Yθ柔性微机械臂
Hui Tang, Yangmin Li, Xiao Xiao
In recent years, biological micromanipulations emerge as a promising application in the micro/nano technology. Manual manipulation tends to have disadvantages of low success rate and low repeatability. In order to perform the robotic biomanipulations, a novel flexure-based Yθ large-workspace micromanipulator with differential lever displacement amplifier (DLDA) is proposed in this paper. After a series of optimal designs and mechanism modeling, the mechanism performance of the proposed micromanipulator is validated by using the Finite Element Analysis (FEA) method. Finally, the proposed micromanipulator is fabricated and close-loop experimentally tested to make a prototype characterization. In this study, two piezoelectric (PZT) actuators P-216.80 with close-loop travel 120 μm and close-loop resolution 2.4 nm are employed, the simulation and experimentally results indicate that the mechanism displacement amplification ratio can reach up to 31, thus the maximum output displacement can achieve around 3.3 mm, the rotation angle can reach up to around 26.5°. Both theoretical derivation and prototype test results well testify the proposed mechanism possesses satisfactory performance to perform the practical biomanipulations.
近年来,生物微操作成为微纳米技术中一个有前景的应用领域。人工操作具有成功率低、可重复性低等缺点。为了实现机器人的生物操纵,提出了一种基于柔性的带差分杠杆位移放大器(DLDA)的Yθ大工作空间微机械臂。经过一系列的优化设计和机构建模,采用有限元分析(FEA)方法验证了该微机械臂的机构性能。最后,对所提出的微机械臂进行了制作和闭环实验测试,并进行了原型表征。采用两个闭环行程为120 μm、闭环分辨率为2.4 nm的压电陶瓷(PZT)作动器P-216.80,仿真和实验结果表明,该机构位移放大比可达31倍,最大输出位移可达3.3 mm左右,旋转角度可达26.5°左右。理论推导和样机试验结果都证明了所提出的机构具有令人满意的性能,可以进行实际的生物操纵。
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引用次数: 3
Combined influence of substrate relief and mechanical compression on topographical evolution of surface wrinkling 基材起伏和机械压缩对表面起皱形貌演化的综合影响
Xiaoli Zhao, W. An, Jiuchun Yan, Liqin Wang
Controlled surface wrinkling could provide ordered and hierarchical structures in micro- and nano-meter scale. Here combined influence of out-of-plane compressive stress and in-plane substrate relief in Au/PDMS bilayer system was experimentally investigated to explore morphological evolution of surface wrinkling. Compared with single influence from out-of-plane compression or in-plane relief, the combined effect mainly reflected in two aspects: edge effect and rearrangement effect. Edge effect applied morphological change on the compressed fields near the edges, but patterns almost restored to the original shape after stress relaxation. Rearrangement effect made relaxed patterns on the rectangular convex regions to rearrange and led to the failure of shape memory effect. The results demonstrated that the combined effect could partly rearrange the original structures, which would be utilized to fabricate the complicated structures.
控制表面起皱可以在微纳米尺度上提供有序的层次结构。本文通过实验研究了Au/PDMS双层体系中面外压应力和面内基底起伏对表面起皱的影响,探讨了表面起皱的形态演变。与面外压缩或面内起伏的单一影响相比,复合影响主要体现在边缘效应和重排效应两个方面。边缘效应使边缘附近的压缩场发生形态变化,但应力松弛后图案几乎恢复到原始形状。重排效应使矩形凸区域上的松弛图案发生重排,导致形状记忆效应失效。结果表明,复合效应可使原结构部分重新排列,可用于制造复杂结构。
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引用次数: 0
Quantification of living cell adhesion forces with a nanorobotic system 用纳米机器人系统定量测定活细胞粘附力
Hui Xie, Munan Yin, Weibin Rang
Cell-surface adhesion forces are significant in regulating cellular activities. In this paper, a nanorobotic system was developed and based on this system, a novel method measuring the cell-surface adhesion force is proposed. The nanorobotic system mainly consists of two independently actuated and sensed microcantilevers, forming a nanotweezer with capabilities of pick-and-place manipulation of a single cell in aqueous environments with accurate force sensing that is sufficiently sensitive to characterize interactions of cell-cell, cell-surface, even single molecules. Capabilities of the developed nanorobotic system have been validated by experimentally qualifying cell-surface adhesion events occurred between C2C12 cells (mouse adherent myoblasts) and Petri dishes under different contact time.
细胞表面粘附力在调节细胞活动中起着重要作用。本文开发了一个纳米机器人系统,并在此系统的基础上,提出了一种测量细胞表面粘附力的新方法。纳米机器人系统主要由两个独立驱动和传感的微悬臂组成,形成一个纳米镊子,具有在水环境中对单个细胞进行拾取和放置操作的能力,具有精确的力传感,足够敏感,可以表征细胞-细胞,细胞表面,甚至单个分子的相互作用。通过实验验证C2C12细胞(小鼠贴壁成肌细胞)与培养皿在不同接触时间下的细胞表面粘附事件,验证了所开发的纳米机器人系统的能力。
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引用次数: 1
Investigation on friction performance of graphene 石墨烯摩擦性能研究
Chenfei Sun, Yan Zhang, Yujuan Wang, Yunfei Chen
Graphene is a newly emerging material in many different fields because of its special physical structure. This literature focuses on the influence of layer numbers on friction characteristics. The sample is deposited on a SiO2 substrate. Optical microscope is used to precisely position the specimen while AFM and Raman spectroscopy are suitable tools to determine the layer number of the sheet material. It is found that both the friction force and friction coefficient are reduced with the increase of layer numbers. Moreover, it is also investigated that friction force increases with the velocity.
石墨烯由于其特殊的物理结构,在许多不同领域都是一种新兴的材料。本文主要研究了层数对摩擦特性的影响。样品被沉积在SiO2衬底上。光学显微镜用于精确定位样品,AFM和拉曼光谱是确定薄片材料层数的合适工具。结果表明,摩擦力和摩擦系数随层数的增加而减小。此外,还研究了摩擦力随速度的增加而增加的规律。
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引用次数: 1
Structure topology optimization of two-dimension micro/nano angular-table 二维微纳角工作台结构拓扑优化
M. Helal, Lefeng Wang, Lining Sun
Compliant mechanisms have made an enormous contribution in the design process of various fields such as for adaptive structures, hand-held tools, components in transportations, electronics, and surgical tools. The use of compliant mechanisms will help in reducing the number of components, which therefore decrease manufacturing cost and additionally increase the performance. Topology optimization has proven to be a powerful method for the conceptual design of structures and mechanisms. Topology optimization is the technique that finds the optimal layout of the structure within a specified design domain. This paper presents the micro/nano angular-table compliant mechanism. The topology optimization is applied for designing two-dimensional micro/nano angular-table compliant mechanism. The final optimal topology configuration of the micro/nano-angular table is shown and discussed.
柔性机构在各种领域的设计过程中做出了巨大的贡献,如自适应结构、手持工具、运输部件、电子设备和外科手术工具。使用兼容的机制将有助于减少组件的数量,从而降低制造成本并额外提高性能。拓扑优化已被证明是结构和机构概念设计的有力方法。拓扑优化是在指定的设计域内找到结构的最优布局的技术。提出了一种微纳角工作台柔性机构。将拓扑优化方法应用于二维微纳角工作台柔性机构的设计。最后给出并讨论了微/纳米角表的最优拓扑结构。
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引用次数: 1
Effect of surface topography on hydrophobicity and bacterial adhesion of polystyrene 表面形貌对聚苯乙烯疏水性和细菌粘附性的影响
A. J. Mohamad, Xinyao Zhu, Xianping Liu, Wilhelm Pfleging, M. Torge
We report the investigation on effect of surface topography (roughness) and hydrophobicity (contact angle measurement) on bacteria adhesion for polystyrene material. The surfaces of polystyrene substrates were patterned using UV-laser radiation with a wavelength of 193 nm at different conditions. Different surface topographies were fabricated and then measured by an optical surface profiler and contact angle measurements. For bacterial adhesion experiments, an assay of Escherichia coli (E.coli) has been developed and used for bacterial adhesion measurements on both as received and the modified polystyrene surfaces. The method is based upon the staining of attached bacterial cells with the nucleic acid-binding, green fluorescent DAPI stain. The preliminary results show that laser-assisted modification by using laser ablation can make polystyrene substrates either more hydrophilic (with oxygen) or more hydrophobic (with air). The contact angle can be varied from 37° to 108°. The results on bacterial attachment show that the polystyrene substrates as received have no bacteria attached, indicating a good anti-bacterial performance. The treated substrates show some bacterial attachment and, in particular, the surfaces with high contact angle have much higher numbers of bacterial cells attached. This indicates that such laser-assisted process with air can make polystyrene surfaces more attractive to E. coli bacteria.
本文报道了聚苯乙烯材料表面形貌(粗糙度)和疏水性(接触角测量)对细菌粘附的影响。利用波长为193 nm的紫外激光在不同条件下对聚苯乙烯衬底表面进行了图案化处理。制作了不同的表面形貌,然后通过光学表面轮廓仪和接触角测量进行了测量。对于细菌粘附实验,已经开发了一种大肠杆菌(E.coli)的测定方法,并用于在接收到的和改性聚苯乙烯表面上进行细菌粘附测量。该方法是基于对附着的细菌细胞进行核酸结合的绿色荧光DAPI染色。初步结果表明,利用激光烧蚀技术对聚苯乙烯基板进行激光辅助改性,可以使聚苯乙烯基板的亲水性(含氧)增强,疏水性(含空气)增强。接触角可在37°至108°范围内变化。细菌附着结果表明,所得到的聚苯乙烯底物无细菌附着,具有良好的抗菌性能。处理过的底物显示出一些细菌附着,特别是具有高接触角的表面具有更高数量的细菌细胞附着。这表明这种激光辅助空气处理可以使聚苯乙烯表面对大肠杆菌更有吸引力。
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引用次数: 1
Research on composite autofocus algorithm for detection system of pipeline robot 管道机器人检测系统的复合自动对焦算法研究
Huixiang Wang, T. Li, Bohui Zhang
For the problem of the delay of autofocus, fuzzy image and the error of motor control in the traditional pipeline detection system (PDS), a new kind of PDS with voice-coil-motor drive is introduced in this paper. It adapts two-stage composite algorithm based on the deviations function and the wavelet transform, and uses the improved mountain-climbing-search-strategy. Finally complete the simulation of algorithm by MATLAB, test image processing through the platform of VC++6.0 and achieve the ideal effect of focus.
针对传统管道检测系统存在的自动对焦延迟、图像模糊和电机控制误差等问题,介绍了一种新型的声圈电机驱动管道检测系统。采用基于偏差函数和小波变换的两阶段复合算法,并采用改进的爬山搜索策略。最后通过MATLAB完成算法的仿真,通过vc++ 6.0平台测试图像处理,达到理想的对焦效果。
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引用次数: 1
Application of twisting algorithm to a 2D electrostatic MEMS micromirror 扭转算法在二维静电微机电系统微镜中的应用
Hui Chen, M. Pallapa, Weijie Sun, Zhendong Sun, J. Yeow
In this paper, a second-order sliding mode control (2-SMC) scheme, called twisting algorithm, is applied to control an electrostatically actuated 2D torsional MEMS micromirror. The proposed twisting algorithm is able to improve the transient and positioning performance of the controlled 2D micromirror including robustness against model uncertainties and external disturbances. The main advantages of the proposed scheme over the first-order SMCare chattering attenuation and enhanced positional accuracy. The closed-loop stability and higher performance of the micromirror under closed-loop control is verified though numerical simulations and experiments.
本文提出了一种二阶滑模控制(2-SMC)方案,称为扭转算法,用于控制静电驱动的二维扭转MEMS微镜。所提出的扭转算法能够提高被控二维微镜的瞬态和定位性能,包括对模型不确定性和外部干扰的鲁棒性。该方案相对于一阶SMCare抖振衰减和位置精度的提高具有明显的优点。通过数值模拟和实验验证了微镜在闭环控制下的闭环稳定性和较高的性能。
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引用次数: 2
Topology optimization of hinge-free compliant mechanisms using a two-step FEA method 基于两步有限元法的无铰柔性机构拓扑优化
Benliang Zhu, Xianmin Zhang, Quan Zhang, S. Fatikow
This study is proposed to solve the compliant mechanism de facto hinge (point flexure) issue by developing a new problem formulation. The main idea is to introduce an additional objective function which is to minimize the distance between the outputs of two types finite element analysis (FEA). A ratio formed formulation is developed based on the method and examined within the continuum type topology optimization framework. Numerical examples are provided to confirm the validity of the proposed method. It is shown that the proposed method gives compliant mechanisms that completely free of one-node connected hinges.
本研究提出了一种新的问题表述,以解决柔性机构事实上的铰(点挠)问题。主要思想是引入一个额外的目标函数,使两种类型的有限元分析(FEA)的输出之间的距离最小。在此基础上,提出了一种比率成形公式,并在连续型拓扑优化框架内进行了验证。数值算例验证了该方法的有效性。结果表明,该方法可以得到完全不受单节点连接铰约束的柔性机构。
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引用次数: 1
期刊
2013 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale
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