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The disadvantages of classic ring type ultrasonic motor were analyzed.To obtain large mechanical output power,a ring type standing wave ultrasonic motor using cantilever type longitudinal transducers was proposed.There are four pairs of cantilevers on one side of the ring,and four PZT ceramics are set between each pair of cantilevers.A screw fastened the PZT ceramics and cantilevers together to form a longitudinal transducer.The bending vibration mode of the ring is excited by the stretching vibration of the PZT ceramics.Thus,linear simple harmonic motions are achieved at the particle on the teeth.And the driving force is the frictional force between rotor and stator.The working principle of the proposed motor was analyzed.The ring and the longitudinal transducer were designed with FEM.The sensitive parameters of resonant frequency of the transducer and ring could be gained with modal analysis.The longitudinal vibration modal of transducer and bending vibration modal of ring were degenerated,and the motion trajectories of nodes on the teeth were analyzed.The results of this paper could guide the development of this new type of motor. 相似文献
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基于所提出的虚拟滚动体的思想,阐述了超声波减摩的实质。设计了一种新型超声马达,借助ANSYS有限元分析软件对其进行了振型分析,并对本样机进行了试验,利用MATLAB进行了运动仿真。说明在两运动体的一方加入超声波,形成的虚拟滚动体可以使其摩擦降低。 相似文献
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超声波在拉丝上的应用 总被引:2,自引:0,他引:2
本文阐述了超声波拉丝在国内外的发展状况及应用价值,并介绍了超声波在拉丝上应用的两种方案。 相似文献
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近年来超声电机在机床进给系统中的应用越来越广泛,针对于传统贴片式驻波型超声电机效率低,功率小,不利于在进给系统中应用的现状,文章提出一种利用夹心式弯振换能器的激励弯曲驻波的驻波直线超声电机。运用振动理论分析了电机的致动原理:通过激励两种不同谐振频率的弯曲驻波,并结合驱动齿的合理分布,可实现双向运动。采用有限元法确定其具体结构尺寸,并验证了各驱动齿端部振动轨迹为倾向一致的斜线。制作了样机并测定了其机械输出特性,达到如下指标:最大推力14N,最高速度180mm/s。 相似文献
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某型六自由度运动系统误差建模 总被引:1,自引:0,他引:1
基于多体系统运动学理论的基本原理,结合六自由度运动系统,阐述了多体系统的拓扑结构,分析了多体系统有误差运动的基本规律,推导了特征矩阵构建方法,研究了根据特征矩阵得到六自由度运动系统空间误差模型.本方法可为其他类型的多自由度运动系统的误差建模及误差补偿提供理论参考. 相似文献
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This paper studies the effect of the head swing motion on the fishlike robot swimming performance numerically.Two critical parameters are employed in describing the kinematics of the head swing: the leading edge amplitude of the head and the trailing edge amplitude of the head.Three-dimensional Navier-Stokes equations are used to compute the viscous flow over the robot.The user-defined functions and the dynamic mesh technology are used to simulate the fishlike swimming with the head swing motion.The results reveal that it is of great benefit for the fish to improve the thrust and also the propulsive efficiency by increasing the two amplitudes properly.Superior hydrodynamic performance can be achieved at the leading edge amplitudes of 0.05L( L is the fish length) and the trailing edge amplitudes of 0.08 L.The unsteady flow fields clearly indicate the evolution process of the flow structures along the swimming fish.Thrust-indicative flow structures with two pairs of pressure cores in a uniform mode are generated in the superior performance case with an appropriate head swing,rather than with one pair of pressure cores in the case of no head swing.The findings suggest that the swimming biological device design may improve its hydrodynamic performance through the head swing motion. 相似文献
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