Near-field acoustic levitation (NFAL) can be observed for a planar object placed on the vibrating surface of a longitudinal vibrator. However, for a vibrating surface with a recess, not only NFAL was observed, but also jumping behavior with a snapping sound. This phenomenon was examined analytically and experimentally with bolt-clamped Langevin transducers and a duralumin vibratory horn. Jumping occurred when the minimum value of the acoustic radiation force was larger than the weight of the object. The snapping sound during jumping was generated by the sound pressure that was focused at the center of the bottom surface of the object when the acoustic radiation force peaked due to acoustic resonance in the recessed space.

对于放置在纵向振动器的振动表面上的平面物体，可以观察到近场声悬浮 (NFAL)。然而，对于带有凹槽的振动表面，不仅可以观察到 NFAL，还可以观察到带有啪啪声的跳跃行为。使用螺栓夹式朗之万换能器和硬铝振动喇叭对这种现象进行了分析和实验研究。当声辐射力的最小值大于物体的重量时，就会发生跳跃。跳跃时的啪啪声是由于凹陷空间中的声共振导致声辐射力达到峰值时，声压集中在物体底面中心的声压产生的。