Reduced vibration characteristics of a B-G platform damper based on a micro-slip model

Elastic shear layer was induced into friction surfaces to simulate dry friction contact. Considering that dry friction surface may pass through three phases including fully viscosity, partial slip, and gross slip during vibration, an improved micro-slip model was proposed. By employing this model, a hysteresis curve of friction-to-displacement was simulated and obtained, the results agreed well with practical data. The friction distribution on friction surfaces was analyzed under various external forces, and the essence of the micro-slip model was revealed. Further more, by using the method of equivalent linearization associated with first order harmonic balance method (HBM), influences of multiple parameters on the equivalent stiffness, the equivalent damping and the characteristics of the reduced vibration of a dry friction B-G platform damper were studied. Conclusions drawn from the above analyses were helpful for design of a B-G platform damper.