悬浮在超声波导中的平面物体周围的声场

Proc. Meet. Acoust. Pub Date : 2018-10-30 DOI:10.1121/2.0000890

Kentaro Masuda, D. Koyama, M. Matsukawa

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引用次数: 0

摘要

本文研究了用于平面物体的声悬浮和非接触运输技术。声波悬浮系统由一个1毫米厚、400毫米长的弯曲板和两个带阶梯角的螺栓夹紧朗格万型换能器(blt)组成。平行于振动板安装一个平面反射器，在反射器和振动板之间产生超声驻波。在波导中沿声驻波的节线悬浮平面物体，影响板周围的声压分布。利用有限元方法计算了超声波导内的声压分布，研究了平面物体在驻波场中悬浮的影响。在平面物体的上下空气层中激发了x方向波长约为15 mm的(3,1)共振模式。波导中的声场对平面物体的长度敏感，在波导中产生z方向的半波长共振模式时，声压幅值出现多个峰值，说明存在适合于声悬浮的平板长度。本文研究了用于平面物体的声悬浮和非接触运输技术。声波悬浮系统由一个1毫米厚、400毫米长的弯曲板和两个带阶梯角的螺栓夹紧朗格万型换能器(blt)组成。平行于振动板安装一个平面反射器，在反射器和振动板之间产生超声驻波。在波导中沿声驻波的节线悬浮平面物体，影响板周围的声压分布。利用有限元方法计算了超声波导内的声压分布，研究了平面物体在驻波场中悬浮的影响。在平面物体的上下空气层中激发了x方向波长约为15 mm的(3,1)共振模式。波导中的声场对…的长度很敏感。

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Acoustic field around a planar object levitated in an ultrasound waveguide

This paper investigates acoustic levitation and noncontact transportation techniques for use with planar objects. An acoustic levitation system was developed that consists of a 1-mm-thick and 400-mm-long bending plate along with two bolt-clamped Langevin-type transducers (BLTs) that have stepped horns. A plane reflector was installed parallel to the vibrating plate to generate an ultrasound standing wave between the reflector and the plate. A planar object was levitated along the nodal line of the acoustic standing wave in the waveguide, and that affected the sound pressure distribution around the plate. The sound pressure distribution in the ultrasound waveguide was calculated via finite element analysis to investigate the effects of levitation of a planar object in the standing wave field. The (3, 1) resonance mode with a wavelength of approximately 15 mm in the x direction was excited in the air layer above and below the planar object. The acoustic field in the waveguide was sensitive to the length of the planar object, and several peaks occurred in the sound pressure amplitude when the half-wavelength resonance mode in the z direction was generated in the waveguide, indicating that there were suitable lengths of the plate for the acoustic levitation.This paper investigates acoustic levitation and noncontact transportation techniques for use with planar objects. An acoustic levitation system was developed that consists of a 1-mm-thick and 400-mm-long bending plate along with two bolt-clamped Langevin-type transducers (BLTs) that have stepped horns. A plane reflector was installed parallel to the vibrating plate to generate an ultrasound standing wave between the reflector and the plate. A planar object was levitated along the nodal line of the acoustic standing wave in the waveguide, and that affected the sound pressure distribution around the plate. The sound pressure distribution in the ultrasound waveguide was calculated via finite element analysis to investigate the effects of levitation of a planar object in the standing wave field. The (3, 1) resonance mode with a wavelength of approximately 15 mm in the x direction was excited in the air layer above and below the planar object. The acoustic field in the waveguide was sensitive to the length of ...

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Proc. Meet. Acoust.

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