【作者】 贠倩； 张小凤；

【Author】 YUN Qian;ZHANG Xiao-feng;State Ultrasonics Key Laboratory of Shaanxi Province School of Physics & Information Technology, Shaanxi Normal University;

【机构】 陕西师范大学物理与信息技术学院陕西省超声学重点实验室；

【摘要】 本文根据柱函数加性定理,推导了高斯波束在空间任意位置的有限级数展开式,计算了理想液体介质中位于任意位置的柱形粒子的声辐射力。通过数值模拟,研究了波束宽度,偏移距离以及频率对液体介质中刚性柱和弹性柱形粒子声辐射力的影响。研究结果表明,随着波束宽度的增大,柱形粒子所受的轴向声辐射力变大而横向声辐射力减小;在ka较小时,轴向声辐射力受频率影响比较大,ka较大时,轴向声辐射力基本趋于稳定,而横向声辐射力随着频率先增大后减小;当波束宽度较大时,在ka?5时,横向声辐射力的方向发生变化.;轴向声辐射力随偏移距离的增大而减小,当偏移距与波束大小相当时横向声辐射力最大。更多还原

【Abstract】 In this paper, the translational addition theorem for Bessel functions is employed to deduce the expression of Gaussian beam in terms of an infinite series at arbitrary position. The acoustic radiation force on a cylinder arbitrarily suspended in an inviscid fluid is calculated. The factors such as beam waist, the distance between the cylinder and the beam center, and the frequency of the acoustic beam, which influence the acoustic radiation force on rigid or elastic cylinder, are studied. The simulation results show that the axial acoustic radiation force increase with the waist radius, while, the transverse radiation force decrease with it. The axial radiation was influenced by the ka when it have a smaller value, then it tend to a stable value when ka increase. The transverse radiation force increase with ka at first and then decrease with it, and the direction of the radiation force will reverse when ka?5. The axial radiation force gradually decreases with 0x and 0y increased, meanwhile the transverse radiation force reach the peak when the distance close to the waist radius.更多还原