小小桐桐
微驱动器需要谐振传感器,如上所述,振荡在其共振频率。他们还要求出示所需的机械输出特别微:这可能是移动微激光束扫描,或开关从一个纤维另一;驱动显微切割工具的应用;驱动微型泵和阀门的微量或微系统;或这些甚至可能微设备,以刺激神经组织的神经修复应用。 在下面一节不同的方法来实现microactuation简要概述:静电,磁性,压电,液压和热。这些,压电和液压方法目前看来最有希望,但其他人自己的位置。静电驱动运行密切第三,可能是最常见和最完善的方法,但它却受到一些磨损和坚持的问题。磁驱动器通常需要相对较高的电流(和高功率) ,以及对微观规模,静电驱动方法通常提供更好的输出单位体积(限额是在该地区的地方去从1厘米立方装置几个毫米立方-视关于适用) 。热致动器也需要相对大量的电能,而且产生的热量也逐渐消散。 在处理非常平滑的表面,典型的微机械装置,或冷焊坚持的一个部分到另一个可能是一个问题。这些影响可以增加摩擦到这种程度,所有的输出功率的设备,需要公正,克服它,并且可以防止一些设备运行在所有。精心设计和选择的材料可以用来克服这些问题,但他们仍然滋事与许多微电机的设计。另一点应注意的是,在消除微设备湿蚀刻浴,表面张力的液体可以强大到足以坚持零件在一起。
小不娃娃
为驱动谐振传感器,需要微型操作器;如上述,在其谐振频率下进行振荡。也要求它们产生特殊微型系统需要的机械输出:这可以移动微型镜子去扫描激光束;或把它们从一个光纤切换到另一光纤;驱动显微手术的手术工具;驱动显微分析或微流体力学用微型泵和阀门;或者这些甚至可作为微电极装置在中性修复术应用中刺激神经组织。(待译)
睡神熊猫
铣削是一个基本的加工过程中,其中一个表面是由从工件上去除的芯片逐步生成,因为它被输送到切割器的轴线垂直的方向上的旋转切刀。在某些情况下,工件保持静止,并且切割器送入卓字。在几乎所有的情况下使用,以便, amultiple齿铣刀的材料去除率高,普通的铣削操作在图5-2-2中描绘的。通常所需的表面通过在一个单一的切割器或工作,因为可以得到非常良好的表面光洁度,铣削是特别适合于广泛的应用,为大规模生产word.Unquestionably ,更平坦的表面是由铣削比任何其他的加工过程。 望采纳
janelin1002
OneA system that transmits forces in a predetermined manner to accomplish specific objectives may be considered a machine. A mechanism may be defined in a similar manner, but the term mechanism is usually applied to a system where the principal function is to transmit motion. Kinematics is the study of motion in mechanisms, while the analysis of forces and torques in machines is called dynamics.1. 一个以预定方式完成特定目标的,传递力的系统可以认为是一种机器。一个机构可以以类似的方式加以定义,但机构这个术语通常被用于一个主要功能是传递运动的系统。运动学是研究机构的运动,而对机器中的力和转矩的分析则称为动力学Once the need for a machine or mechanism with given characteristic is identified, the design process be begins. Detailed analysis of displacements, velocities, and accelerations is usually required. This part of the design process is then followed by analysis of forces and torques. 一旦认定需要具有给定特性的机器或机构,设计过程就开始了。通常需要详细分析位移、速度和加速度。在设计过程的这一部分以后,接着就是分析力和转矩。The design process may continue long after first models have been produced and include redesigns of components that affect velocities, accelerations, forces, and torques. In order to successfully compete from year to year, most manufacturers must continuously modify their product and their methods of production. Increases in production rate, updating of product performance, redesign for cost and weight reduction, and motion analysis of new product lines are frequently required. Success may hinge on the correct kinematic and dynamic analysis of the problem.设计过程可能在第一个模型生产出来后继续很长时间,并包括对可能影响速度、加速度、力和转矩的元部件的重新设计。为了成功进行年复一年的竞争,大多数制造商必须不断修改自己的产品技它们的生产方法。生产速度的提高、产品性能的更新、为了降低成本和重量进行重新设计,以及新产品生产线的运动分析等都是不断需要的。成功可能取决于问题的正确的运动学分析和动力学分析。Many of the basic linkage configurations have been incorporated into machines designed centuries ago, and the terms we use to describe them have changes over the years. Thus, definitions and terminology will not be consistent throughout the technical literature. In most cases, however, meanings will be clear form the context of descriptive matter. A few terms of particular interest to the study of kinematics and dynamics of machines are defined.很多基本的连锁机构的配置在几个世纪前就已结合进设计的机器中,而我们用来描述它们的术语也随着年代而改变了。因此,定义和术语在技术文献中不是一致的。可是在大多数情况下,从所叙述事物的来龙去脉看这些意义是清楚的。对研究机器运动学和动力学特别有意义的几个术语做了定义。TwoA new machine is born because there is a real or imagined need for it. It evolves from some one's conception of a device with which to accomplish a particular purpose. From the conception follows a study of the arrangement of the parts, the location and length of links (which may include a kinematic study of the linkage), the places for gears, bolts, springs, cams, and other elements of machines. With all ideas subject to change and improvement, several solutions may be and usually are found, the seemingly best one being chosen.2 一台新机器因为有真实的或想象的需要而诞生。它从某个人用来完成一项特定目的的设计概念演变而来。从这一概念,引来对零部件排列,连接部件位置和长度(这可能包括连杆机构运动学的研究),齿轮、螺栓、弹簧、凸轮和其他机器元件的放置等的研究。在所有想法都受到改变和改进的同时,就会发现,而且通常就会发现若干解决方案,然后选择似乎最佳的方案。The actual practice of designing is applying a combination of scientific principles and a knowing judgment based on experience. It is seldom that a design problem has only one right answer, a situation that is often annoying to the beginner in machine design.设计的实际惯例是采用科学原理和根据经验建立的明智判断。很少有一个设计问题只有一个正确答案,这是一个常常令机器设计新手烦恼的情况。Design problems usually have more than on answer. Given a general statement of a design problem, such as a machine to wash clothes in the home automatically, and there will be as many different answers there are design teams—as attested by the number of washing machines on the market.设计问题通常有一个以上的答案。假设给出一个设计问题的一般性说法,比如一台家用自动洗衣机,而那么有多少设计小组就有多少不同的答案,就像市场上洗衣机的数目所证明的那样。