Abstract
Stability is a key factor in near-field acoustic levitation (NFAL), which is a popular method for noncontact transportation of surface-sensitive objects. Since the physical principle of NFAL is based on nonlinear vibration and nonuniform pressure distribution of a plate resonator, traditional linearized stability analysis cannot address this problem correctly. We have performed a theoretical analysis on the levitation stability using a nonlinear squeeze film model including inertia effects and entrance pressure drop, and obtained nonlinear effective restoring force and moment. It was found that the nonuniform pressure distribution is mode-dependent, which determines the stability of the levitation system. Based on the theoretical understanding, we have designed a NFAL resonator with tapered cross section, which can provide higher stability for the levitating object than the rectangular cross-section resonator.
Original language | English (US) |
---|---|
Article number | 084518 |
Journal | Journal of Applied Physics |
Volume | 109 |
Issue number | 8 |
DOIs | |
State | Published - Apr 15 2011 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy