ANALYSIS OF NONLINEAR DYNAMICS OF A SMALL VIBRO-IMPACT DRIVER

Abstract: A dynamic model of a small vibro-impact pile driver with progressive motions is established. Types of vibro-impact motions, bifurcations and the influence of system parameters on a progression rate are studied in the low coefficient of restitution and a plastic impact case. The coexistent attractors and their domains are analyzed. In an elastic impact case, the chattering impacts finally bring out the synchronous and progressive motion of a driver and a pile, and the best progression of a pile is achieved in the region of low forcing frequencies. In a plastic impact case, the synchronous or non-synchronous progressive motions of impact components occur immediately after the impact, and the best progression of the system occurs for motion. Grazing bifurcation is generated via the grazing contact of two masses immediately before the impact, which leads the motion to motion or chaotic motion immediately.