Acoustic manipulation of active spherical carriers: Generation of negative radiation force

Rajabi, Majid; Mojahed, Alireza

doi:10.1016/j.aop.2016.05.003

Cited by 16 publications

(21 citation statements)

References 51 publications

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“…Amplitude of non-uniform voltage, V , required to cancel the acoustic radiation force in Z-direction on carrier with outer radius of 1 mm which is insonified by a progressive plane wave with the incident pressure amplitude of 100 Pa versus non-dimensional frequency, f ka , in logarithmic scale and the comparison with the case of breathing mode voltage implementation, introduced in Ref. [32]. Fig.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Also, Φ refers to the electric potential function. The elastic constant matrices of the casing/actuator, c and C , the piezoelectricity matrix, e , and the operator matrices Λ and Q are given in [32]. The strain -displacement relations are as , = s Ηu , = S HU where u and U are displacement vectors of the isotropic elastic material and the piezoelectric material, respectively and H is again given in [32].In the absence of the body forces, the relevant structural dynamic equations may be described as…”

Section: Dynamics Of Structurementioning

confidence: 99%

“…where c  and p  are the densities of the casing and piezoelectric actuator materials, respectively, and the matrix,  , is represented in [32].…”

Section: Dynamics Of Structurementioning

confidence: 99%

“…Applying the appropriate boundary conditions like what we have done in Ref. [32] at the outer and inner surfaces of the structure leads to the scattering coefficients, nm A , which uncover all the physical quantities in the fluidic medium.…”

Section: Applied Voltage and Scattering Coefficientsmentioning

confidence: 99%

“…For the earliest step toward the manipulation technique, the range of the amplitude of the applied voltage should be determined. Considering the previous works in this area [32], and limiting the problem to the symmetric configuration (i.e., the divisor plane is perpendicular to the incident wave propagation), it is expected that for any operational frequency, a specific voltage amplitude may be found that determines the radiation force state on the carrier (i.e., 24) and (25), and by using the formula of acoustic radiation force in Z-direction and in the conditions that the wave is perpendicular to the divisor plane, we get , , ,…”

Section: Acoustic Manipulation Techniquementioning

confidence: 99%

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Acoustic steering of active spherical carriers

2020

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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.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Dynamics Of Structurementioning

confidence: 99%

“…where c  and p  are the densities of the casing and piezoelectric actuator materials, respectively, and the matrix,  , is represented in [32].…”

Section: Dynamics Of Structurementioning

confidence: 99%

Section: Applied Voltage and Scattering Coefficientsmentioning

confidence: 99%

Section: Acoustic Manipulation Techniquementioning

confidence: 99%