有源球形载体的声操纵
Acoustic Steering of Active Spherical Carriers
摘要：
本文在引入主动载体概念的基础上，提出了一种内部装有压电陶瓷的主动球形载体作为可操作的非接触资产，在渐进平面声波作用下的可操作性研究方法。假设有源载体的压电部分可以被致动为双截体（即，两个连续的半球形部分），具有规定的相位差，并且可以改变虚分离平面的极位置。这个问题带来了一个不对称的问题，导致出现的位置/频率相关的声辐射扭矩的动态。结果表明，当施加具有相同幅值和$π$ -弧度相位差的谐波电压激励载体时，对于特定幅值和相位的电压作为频率的函数，可以获得零辐射力的情况。这种情况被视为一个标准，以确定最佳幅度的操作电压。它示出的净力的方向施加在被激活的载体上可以被操纵沿任何所需的取向，假设入射波场的固定方向。所解释的方法的激励和可控性的空间位置的除数平面可能是一个突破，在声学处理的有源载流子。值得注意的是，通过这种新技术，基于单波束声学的非接触方法及其与有源载波概念相关联的应用现在向前迈进了一步。
英文摘要：
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 the 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.
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