Research on Mechanism and Stability of Ultrasonic Levitation with Simulation and Experiment

With the research and development of the high-tech materials, condensed matter physics and surface protection of high precision instruments, the importance of microgravity and contactless environment has become increasingly prominent. Meanwhile, the non-contact support technology to realize this special environment also plays a pivotal role. Ultrasonic levitation technology is an important branch of noncontact support technology, which has the advantages of simple implementation, easy operation, stability and reliability. Using this technology, microgravity and contactless environments can be simulated to meet a variety of contactless research and production requirements. Firstly, in this paper, the equation of suspended ultrasonic wave was derived under the condition of ideal medium, and the expression form of standing wave equation was obtained. Secondly, the motion equation of sound field was deduced and the relation between sound pressure and particle vibration velocity was established. Then, according to the functions of sound field, the image of sound pressure and particle vibration velocity was drawn, and the stable suspension region in sound field was deduced. Finally, based on the theory of Time-Averaged Potential of sound field, the levitation force generated by ultrasonic wave suspension was derived, and the factors influencing the levitation force were judged according to the levitation force equation. In order to verify the physical phenomenon of ultrasonic levitation, this paper also simulated the ultrasonic levitation sound field by simulation software, and built an Arduino-based ultrasonic levitation experiment platform to carry out the ultrasonic levitation experiment with equal distance and the experiment on factors influencing the stability of ultrasonic levitation.