Sustainable Manufacturing Systems Research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran.
Sustainable Manufacturing Systems Research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran.
Ultrasonics. 2020 Jul;105:106112. doi: 10.1016/j.ultras.2020.106112. Epub 2020 Mar 2.
Following the novel introduced concept of the active carriers, this paper brings forward a technique toward the manipulability of an internally piezo-equipped active spherical carrier subjected to the progressive acoustic plane waves as the handling contactless asset. It is assumed that the piezoelectric part of the active carrier may be actuated as a bi-sectional body (i.e., two continuous hemispherical parts), with prescribed phase difference, and the polar position of the imaginary separating plane may be altered. This issue brings about an asymmetry in the dynamics of the problem which leads to emergence of position/frequency dependent acoustic radiation torque. It is obtained that as the carrier is excited by imposing harmonic voltage with the same amplitude and a π-radians phase difference, the zero-radiation force situation is obtained for a specific amplitude and phase of voltage as a function of frequency. This situation is treated as a criterion to determine the optimal amplitude of operation voltage. It is shown that the net force's direction exerted on the activated carrier may be steered along any desired orientation, assuming the fixed direction of incident wave field. The explained method of excitation and controllability of the spatial position of the divisor plane can possibly be a breakthrough in acoustic handling of active carriers. Noticeably, by this new technique, the single beam acoustic based contact-free methods and their applications in association with the concept of active carriers are now one step forward.
本文借鉴了主动载体的新颖概念，提出了一种针对内部配备压电元件的主动球形载体的操控技术，将渐进声波平面波作为非接触式处理资产。假设主动载体的压电部分可以作为双节段体（即两个连续的半球体部分）进行驱动，规定相位差，并且想象的分离平面的极位置可以改变。这个问题导致了问题动力学的不对称性，从而出现了位置/频率相关的声辐射扭矩。结果表明，当载体通过施加具有相同幅度和π 弧度相位差的谐波电压进行激励时，作为频率的函数，当电压的幅度和相位达到特定值时，会出现零辐射力情况。这种情况被视为确定最佳操作电压幅度的标准。结果表明，假设入射波场的固定方向，作用在激活载体上的合力方向可以沿着任何所需的方向进行引导。解释的激励方法和分割平面空间位置的可控性可能是声处理主动载体的一个突破。值得注意的是，通过这项新技术，基于单束声的非接触式方法及其与主动载体概念的应用现在向前迈进了一步。
