共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
3.
改善电致伸缩陶瓷微位移器性能的研究 总被引:5,自引:0,他引:5
对压电陶瓷和电致伸缩陶瓷的逆压电效应和电致伸缩效应进行了详细分析,并通过采用所研制的HRPD系列压电/电致伸缩陶瓷驱动电源对WTDS-I电致伸缩微位移器进行了实验研究,得出采用电极化强度控制的方法使电致伸缩微位移器的迟滞由原来的15%减小到1%,蠕变由原来的10%减小到1%,并实现位移输出的线性化。 相似文献
4.
弹性薄膜——电致伸缩微进给机构研究 总被引:4,自引:0,他引:4
由弹性薄膜和电致伸缩微位移器构成的微进给定位机构,将在超精密加工和测试装置中得到广泛的应用。本文给出了该种结构的设计方法,并对其性能进行分析。 相似文献
5.
为研制电流变液作为钳位介质的大行程高精度蠕动式进给机构,以压电陶瓷作为驱动元件,沸石/硅油型电流变液作为钳位介质,研制了蠕动式压电电流变液直线式进给机构样机,并利用计算机编程对机构的进给运动进行了控制,发现机构运动中存在负位移现象并研究了压电陶瓷驱动电压、电流变液钳位电压以及电流变液充放电时间对机构负位移的影响,建立了机构的动力学模型,对影响负位移大小的因素进行了定性探讨。结果表明,机构运动过程中,极板所受的作用力主要是钳位力、阻尼力和压电陶瓷的驱动力,增大钳位力,减小阻尼力,增大驱动力同时减缓驱动力的变化速率,对减小负位移有利。 相似文献
6.
通过在线检测、闭环控制,并把电致伸缩型陶瓷微位移器用于轴向微进给机构,实现了外圆磨床轴向微量亚微米级磨削。 相似文献
7.
8.
9.
10.
电致伸缩陶瓷微位移机构一般包含以下几个部分:电致伸缩陶瓷做位移驱动器、弹性变形体、支承部件。电致伸缩陶瓷微位移驱动器作为机构的核心元件,由专业厂家专门生产.其性能已定,故使用者只能通过优化其它部分而使微位移机构工作于最佳状态。微位移机构的每一个组成元件,其制造精度是有限的。利用一些联接件,如垫片、钢球、螺钉等把它们装配到一起,各装配面之间就会产生接触不紧密的问题,其间隙值从几微米到几十微米,甚至更大。一方面,如果不对它们进行预紧,电致伸缩陶瓷微位移“驱动器的最大位移量也不够补偿其间隙值,另一方面… 相似文献
11.
为探索新型移动机构及其移动方式,提出一种具有缩放平台的串并联移动机构。该机构由两个空间3-RPR并联机构串联组成,其三个平台均为可缩放移动平台。通过三个平台依次缩放配合支链的伸缩,该机构可实现蠕动运动。该机构兼具并联机构高刚度和串联机构运动空间大的优势。应用螺旋理论计算该机构的自由度,运用矢量法进行运动学分析。以攀爬管道内壁为应用案例,介绍该机构蠕动的详细步态。利用Solidworks进行详细的机械设计。利用ADAMS进行攀爬管道的动力学仿真,得到平台的位移曲线以及支链推杆的杆长变化曲线。制作一台原理样机,验证了该机构的自由度特性和蠕动步态。 相似文献
12.
13.
14.
针对普通尺蠖式直线微驱动器运动速度低和输出力小等问题,基于柔顺机构设计了一种新型尺蠖式直线微驱动器。微驱动器由箝位机构、驱动机构和输出轴组成,其运动特点是驱动机构驱动箝位机构进行往复直线运动,箝位机构带动输出轴作直线运动。箝位机构和驱动机构均采用柔性杠杆结构,保证了微驱动器所需的箝位力与驱动力,并提高了其运动速度。采用伪刚体方法建立了驱动电压与箝位力、驱动机构输入位移与输出位移之间的关系,根据功能原理建立了输入力与驱动力之间的关系并制作了样机,搭建了实验测试系统进行性能测试,测试结果表明,驱动器最大箝位力为216.43N,最大驱动力为13.5N,在驱动电压120V,频率95Hz时,达到最大速度48.91mm/s。 相似文献
15.
A micro electro discharge machine with an inchworm type of micro feed mechanism has been developed. The prototype of micro electro discharge machine is comprised of a wire electro discharge grinding unit, a rotating unit of electrode, RC circuitry for micro electro discharge generation and a subsystem detecting and controlling machining process, in addition to the inchworm mechanism. In the design of the inchworm mechanism, a novel clamp mechanism with force magnifying structure is devised to increase its thrust capability and a pair of guide sleeves together with the clamps are used to decrease yawing error. The inchworm mechanism prototype has 60 mm stroke only limited by the length of the shaft, less than 2 μm yawing error and reaches to 30N output thrust force. The machining experiments carried out on the micro EDM prototype are also described. The techniques to machine micro electrode, micro holes with high aspect ratio, micro structures on stainless steel and silicon materials are discussed. Micro electrode diameter as small as 25 μm and micro holes with minimum size of less than 50 μm are obtained. And the maximum aspect ratios of micro electrodes and micro holes exceed 20 and 10 respectively. 相似文献
16.
Katsushi Furutani Kazuhiro Shibatani Naoki Itoh Naotake Mohri 《Precision Engineering》1998,22(3):131-140
Because a parallel mechanism has a high-frequency response, multiple degrees of freedom (DOF), and high stiffness, it can be applied to an end effector for electrical discharge machining (EDM) with a scanning motion. A prototype has 3 DOF: two tilting angles around the x- and y-axes, and the movement in the z-direction. It consists of, a base plate, a stage, a constraint link, and three inchworm devices that act as links. The inchworm devices are connected with the stage and the base plate. The z-position and inclination of the stage are changed by adjusting the length of the inchworm devices. The electrode feeding is controlled by the combination of the steplike movement with the inchworm devices and continuous extension of piezos. The frequency response of the stage by the continuous extension of the piezos is up to 200 Hz. The positioning accuracy of the end effector is less than 30 μm in height and 0.04° in inclination. Some examples of EDM by the scanning motion are demonstrated. 相似文献
17.
为了解决尺蠖电机难以兼顾高速和高精度的问题,提出一种基于导通角调节的驱动方法,对V形双足式尺蠖电机的机电耦合模型、驱动方法和运动机理等进行了研究。根据设计的V形双足式尺蠖电机结构建立其机电耦合模型,基于导通角调节确定尺蠖电机驱动方法。分析V形双足式尺蠖电机运动机理,并搭建实验平台进行实验验证。实验结果表明:在一定允许误差的范围内,实验结果与理论推导相符,验证了驱动方法的合理性与可行性。引入导通角,最小步距由500 nm降低到330 nm,降低了34%;通过同时调节频率f和导通角α,可使电机具备0.5 mm/s的最大驱动速度和330 nm的最小步距的能力。引入变量导通角α,成功实现了电机步距和驱动速度的独立调节。 相似文献
18.
Li Yong Guo Min Li Fang Zhou Zhaoying Department of Precision Instruments Mechanology Tsinghua University Beijing China 《机械工程学报(英文版)》2002,15(2):177-181
Micro electro discharge machining (micro EDM) is a feasible way to manufacture micro structures and has potential application in advanced industrial fields. For the realization of micro EDM, it is necessary to pay careful attention to its equipment design and the development of process techniques. The present status of research and development of micro EDM equipment and process techniques is overviewed. A micro electro discharge machine incorporated with an inchworm type of micro feed mechanism is introduced, and a micro electro discharge machine for drilling micro holes suitable to industrial use is also introduced. Some of the machining experiments carried out on the micro EDM prototypes are shown and the feasibility of the micro EDM technology to practical use is discussed. 相似文献
19.
Insoo Kim Yeung-Shik Kim Eun-Cheol Park 《International Journal of Precision Engineering and Manufacturing》2009,10(3):43-49
This paper proposes a new modeling scheme to describe the hysteresis and the preload characteristics of piezoelectric stack
actuators in the inchworm. From the analysis of piezoelectric stack actuator behavior, the hysteresis can be described by
the functions of a maximum input voltage and the preload. The dynamic characteristics are also identified by the frequency
domain modeling technique based on the experimental data. The hysteresis is compensated by the inverse hysteresis model for
precise control of inchworm displacement. Since the dynamic stiffness of an inchworm is generally low compared to its driving
condition, the mechanical vibration may degrade accuracy of the inchworm. Therefore, the SMC (Sliding Mode Control) and the
Kalman filter are developed for the motion control of the inchworm. The feasibility of the proposed modeling scheme and the
control algorithm is tested and verified experimentally. 相似文献