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Stiffness modeling for near field acoustic levitation bearings

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arxiv 2110.01125 v1 pith:CE464ENC submitted 2021-10-03 physics.app-ph

Stiffness modeling for near field acoustic levitation bearings

classification physics.app-ph
keywords stiffnessdynamiclevitationamplitudebearingsforceinvestigatedacoustic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The dynamic characteristics of near-field levitation bearings have been investigated in this study. Through theoretical analysis, two different types of system stiffness are defined and derived analytically. The dynamic stiffness relates the excitation amplitude to the dynamic force amplitude, while the effective stiffness governs the time-averaged force-displacement relationship. The results indicate two non-linear and asymmetric spring constants that can effectively predict levitation force and height. The models are verified with a carefully designed experimental setup to eliminate the structural resonance effect. Besides, some unique dynamic behaviors are investigated and predicted based on the proposed stiffness model.

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