Concept of an Impact Resonance Diagram for Characterizing the Nonlinear Response of Impact Vibration

摘要

Due to part tolerances or tolerances that allow for assembly, a closed component assembly may be thought of as a closed system of independent rigid bodies, such as a system of nestled shells where a gap exists between each pair of shells. When the assembly is subjected to vertical forced excitations, such as harmonic or random vibration, the individual components will separate and move independently once the level of excitation has overcome the local gravity field. The separated bodies will move independently of one another until impact occurs, then resume independent motion with new initial velocities until the next impact, etc. By defining resonance for a closed impacting system as being ''the region of harmonic driving frequency and magnitude that causes the most severe impacting'' we are well on the way to constructing a resonance diagram for that system. Thus, the impact resonance diagram is a graphical tool that consists of plotting the response of an impacting system in terms of impact severity against the two independent variables of excitation frequency and excitation magnitude. The purpose of the impact resonance diagram is to have a graphical tool to quickly identify regions of excitation frequency and magnitude that will be detrimental to the system. 25 refs., 7 figs. (ERA citation 13:022271)