And the result is that the domain structure of pmn - pt can be achieved successfully using df3 - r microcantilever when vac 3v , f = 5 - 20khz . different cantilevers and electric fields are studied respectively in order to weaken and even eliminate the effect of electrostatic force 在研究pfm检测电畴的过程中,为了减弱甚至消除静电力的干扰,对不同微悬臂、施加电压等因素逐一进行分析研究。
Actuation technologies of micro - mechanical cantilever are summarized , and formula for capacitance and electrostatic force involving edge - effect of comb - drive actuator are derived . a comb - drive electrostatically actuated microgripper and its design process are described in detail 总结了微机械悬臂梁的静电、压电、热、电磁等驱动技术,推导了计及边缘效应的梳状静电驱动器静电力公式。
Van der waals attraction , electrostatic force and capillary adhesion force are the three main forces for micron particle adhered to surface , and further research demonstrates the van der waals attraction is the most important factor to our research objects 根据理论计算,对吸附在光学基片表面上微米和亚微米级的抛光微粒,其范德华力与自身质量之比f _ v m高达10 ~ 6 10 ~ 9 ,传统的清洗方法难以克服它。
A novel method of electrostatic suspension was developed . this article briefly discusses the basic concept , schematic setup and optronic feedback system of the electrostatic suspension . when taking an aluminum plate and a compact disc ( cd ) as the suspended objects respectively , it is measured the electrostatic forces acting on the objects under different electrode voltages and different electrode - object gaps . the experimental results show that the electrostatic forces are sufficient to levitate both of the suspended objects , namely the electrostatic suspension method is practically feasible . compared to the conventional magnetic suspension , the significant characteristic of the electrostatic suspension is that it is capable of suspending most of the conductive and / or nonconductive , magnetic and / or nonmagnetic objects . therefore , this method can be widely applied to realize the electrostatic suspension and non - contact manipulation of the precision objects 本文提出光电反馈式静电悬浮的新方法,简要讨论静电悬浮的原理、装置及其光电反馈控制过程.采用铝片和cd光盘作为悬浮体,测定了不同静电电压和不同悬浮间距时的静电悬浮力,揭示了它们之间的相互关系.结果显示这两种悬浮体均可获得足够的静电悬浮力,证明了静电悬浮的可行性.静电悬浮方法的显著特点是既适用于导电体与非导电体的悬浮,又适用于磁性体与非磁性体的悬浮,克服了传统磁悬浮技术仅适用于磁性体的局限性,可广泛应用于精密元器件的悬浮与非接触无损操作
For example , one of us ( umstadter ) has demonstrated electron beams of a few million electron - volts whose “ brightness ” ( in essence , the concentration of particles in the beam ) exceeds that of beams made by conventional accelerators , mainly because the charges bunched in one pulse of the beam have less time to blow it apart by its own electrostatic forces 例如乌姆斯塔特(本文作者之一)便曾展示过,具有数百万电子伏特的电子线束之亮度(基本上,即是线束内的粒子浓度)超过了传统加速器产生的线束,因为脉冲内束在一起的电荷根本没时间以自身的静电把别人挤开。
This article studys the frozen coal microscopic adhesive structure , pointed out the intensity of frozen coal is the synthesis of chemical bond strength , intermolecular action , hydrogen bond strength , electrostatic force and friction force , because the coal freeze situation differents , effect of different factors are also different 本文研究了冻煤的微观冻粘结构,指出冻煤的强度是化学键力,分子间作用力,氢键力,静电力和摩擦力等多种因素的综合,因煤的冻结情况不同各因素所占比例亦不同。
Electro - conductive fingers of gripper are connected to ground , in order to release the electric charges on the surface of fingers and gripping objects . continuous s - shaped flexures in finger would decrease the stiffness of gripping arm , and slove the contradiction between huge elastic modulus and small surface electrostatic force 本文设计了大深宽比梳状静电驱动形式的微夹持器,采用了导电型并接地连接的微夹持臂,对被操作对象无特殊要求,且可防止静电对操作的影响。
Test results indicated : with the hoist of altitude , the increase of ice amount and the rise of pollutant , the average flashover voltage reduced . the character exponent generally depends on the insulator profile , ice amount , ice state and pollution severity etc . by means of a high - speed camera , a data acquisition system and high voltage test facilities , a series of the flashover processes on ice surfaces were record . the experimental results form this study and the subsequent theoretical analyses suggested : the thermal ionization of the air in front of an arc root resulted in arc movement ; the electrostatic force had an auxiliary effect of impelling arc propagation ; the electrical 通过对摄像机、数据采集系统及高压试验装置记录覆冰绝缘子表面闪络电弧的发展过程的试验结果进行理论分析得出:弧根周围空气的热电离导致了电弧的发展,静电场力对电弧的发展起到了加速作用,电击穿仅发生在闪络最终的跳跃阶段;通过测量闪络过程中的放电电压、泄漏电流、闪络时间、覆冰水电导率、电弧长度及电弧半径等参数,得到了不同阶段电弧(电弧起弧阶段、电弧发展阶段及完全闪络)的发展速度、临界电弧长度均随覆冰水电导率的增加而减小。
This mems optical - switch is driven by electrostatic . so after analyzing the force of cantilever beam with a concentrated end loading , this dissertation analyzes the movement of cantilever beam driven by electrostatic force . then get the size of beam and capacitor plate and analyze their modes using ansys software 本光开关使用静电作为微镜驱动的方式,所以本论文在对微机械中悬臂梁加质量块结构进行力学推导后,分析了在静电驱动下悬臂梁和质量块的运动规律,找出了一组光开关执行结构的参数,并用ansys软件对其进行了分析。
This article solves some theoretical problems of electrostatic suspension based on optoelectronic feedback control . the mechanism of electrostatic induction of conductive suspended objects ( cso ) and electrostatic polarization of insulting suspended objects ( iso ) was theoretical discussed . the equations of charge density on the surface of suspended object caused by electrostatic field were developed . we further provided the equations describing the quantitative relationship of electrostatic forces verses the electrode voltages , the electrode area , the suspending gap , and the electric characteristic of suspended object . these equations show that the inducted surface charge density of cso is greater than the polarized surface charge density of iso , as a result , the electrostatic force acting on cso is larger than that acting on iso , as already proved by the experimental results of measured electrostatic forces . this work provided the theoretical equations and the mathematical models for effectively realizing the optoelectronic feedback control of electrostatic suspension 本文主要讨论光电反馈式静电悬浮的理论问题.研究在静电场作用下导电悬浮体的静电感应机制和绝缘悬浮体的静电极化机理,推导出悬浮体表面的感应电荷或极化电荷的计算公式,以及作用于悬浮体上的静电悬浮力的计算公式,在理论上揭示了静电力与电极电压、电极面积、悬浮间距及悬浮体电学特性等因素之间的关系.结果表明,导电悬浮体表面的感应电荷量比绝缘悬浮体表面的极化电荷量多,因此前者所受的静电悬浮力比后者大,但两者均可实现静电悬浮,这些结论与实验结果完全符合.本文工作为实现静电悬浮的光电反馈控制提供了理论依据