声悬浮的实验研究和数值模拟分析

介绍了自行研制的一种磁致伸缩式单轴超声悬浮装置，用此装置实现了尺寸1—7mm的若干种金属、半导体和有机物在空气中的稳定悬浮和定位，可悬浮样品的密度高达11.3g/cm³.为了优化谐振腔设计，采用边界元方法结合两类不同结构的谐振腔模型研究了谐振腔几何形状对声场分布以及悬浮定位能力和悬浮稳定性的影响. 关键词：

EXPERIMENTAL INVESTIGATION AND NUMERICAL ANALYSIS ON ACOUSTIC LEVITATION

A single-axis acoustic levitator driven by a magnetostrictive ultrasonic transducer was developed, which can stably levitate metallic, semiconducting and organic materials as dense as 11.3g/cm³ in ground-based laboratory. Two types of resonant chambers were investigated by using boundary element approachin order to well understand the effect of chamber geometry on the sound field and, more importantly, on the capability and stability of acoustic levitation. The calculated results and experimental research indicate that the chamber possessing both a planar and a conical reflecting surface can produce radial positioning forces at the lowest mode. This makes its positioning capability larger than that of the chamber with only a planar reflecting surface.