Investigation of vibro-acoustic modulation for different motion type of contact interface

Abstract

The paper presents experimental investigation of sidebands in vibro-acoustic modulation test, generated as an effect of contact-type nonlinearity. The two samples with prepared contact surfaces were tested in experimental works. Two excitation types: low and high frequencies are introduced into the structure via electromagnetic shaker and piezoelectric transducer respectively, to produce contact-related nonlinear effects. The contact surfaces are driven to move relative to each other in two types of motion: micro slip and stick and slip. The motion types are classified according to displacement values using laser vibrometer. For given scenario the analysis of nonlinear effect is performed based on signal response. The paper focuses on investigation of sidebands distribution around carrier frequency.