An Investigation of Friction Dynamics of Mass Spring System with Base Excitation

摘要

The friction force between coupled machine members in relative motion exerts sometimes significant influence on system dynamic behavior, giving rise to undesirable self-excited oscillation. The aim of this paper is to investigate the contribution of each design parameter and operating conditions on the system dynamic performance theoretically and experimentally. The theory presents a comparative analysis between different dynamic coefficient of friction which may exist between the sliding mass which connected to two springs and a harmonic base excitation surfaces. Furthermore, results are obtained for arbitrary values of natural frequency, excitation frequency and amplitude of exciting base displacement. A test rig has been constructed to test several contacting material combinations. Results for sliding mass acceleration have been obtained for a wide range of exciting base frequencies, masses of slider and amplitudes of exciting base displacement, good agreement with theoretical results have been achieved.