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Calculation of the Acoustic Radiation Force Based on the Finite-Difference Time-Domain Method

Author: ChengXin
Tutor: YuGang
School: Harbin Institute of Technology
Course: Mechanical Engineering
Keywords: FDTD method Acoustic radiation force Subwavelength Resonance
CLC: O422.6
Type: Master's thesis
Year: 2011
Downloads: 38
Quote: 0
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Abstract


The sound waves carry momentum and energy, is the object be sonic sound field scattering, refraction, absorption, momentum and energy exchange with the acoustic, will be the role of the acoustic radiation force. Using acoustic radiation force can achieve non-destructive, non-contact manipulation of micro-nano-particles, the effects in the field of cell biology, biophysics, biomedical engineering with a wide range of applications is one of the hot spots of recent scientific and engineering research. In theory of acoustic radiation force a profound understanding of the basis of the effect of pushing applications. However, at this stage, theoretical work is mainly based on the scattering wave theory, the algorithm is only limited research spherical body or the columnar body in the plane wave, standing wave, Gaussian beam and other rules in the sound field acoustic radiation force. In this work, the introduction of the finite-difference time-domain algorithm to calculate the acoustic radiation force and steel columns in the vicinity of the subwavelength slit by acoustic radiation force using the algorithm, the steel columns in the crevices of subwavelength generally exposed to radiation force law. The research contents are as follows: First, the study based on D time domain finite differential method with stress Zhang quantity theory calculation of acoustic radiation force of the general theory, get a steel ball in a plane wave acoustic field by the acoustic radiation force calculation results with the scattering wave theory consistent is good. The method is able to calculate any structure, shape, material particles in any sound field by acoustic radiation force and torque, can greatly enhance understanding of the theory of acoustic radiation force. Then, the steel columns in subwavelength slit structure of the surface by the acoustic radiation force. In the the subwavelength slit at a resonant frequency within the steel columns by acoustic radiation force is larger than the seamless structure of the radiation force. In addition, the discussion in a resonant frequency range, the subwavelength slit width, depth, as well as steel columns with seam between the distance on the acoustic radiation force peak impact. The theoretical results show that: with the the subwavelength slit width decreases, the depth increases, the distance between the slit and cylindrical shortened peak radiation force has a tendency to increase with subwavelength slit a resonant frequency change the trend consistent, also shows that the enhancement effect of acoustic radiation force is caused due to subwavelength structure. Subwavelength slit structure steel ball by acoustic radiation force, on the one hand can deepen the understanding of the finite-difference time-domain algorithm acoustic radiation force, on the other hand to help in-depth understanding of the special sound field particles by acoustic radiation force, provide a theoretical basis for the application of acoustic radiation force.

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CLC: > Mathematical sciences and chemical > Physics > Acoustics > Sound propagation > The resonance of sound and acoustic radiation
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