Realization of a Strongly Nonlinear Vibration-Mitigation Device Using Elastomeric Bumpers

Abstract

Recent research has shown the viability of using nonlinear energy-sink (NES) devices for vibration mitigation in mechanical and structural systems. When attached to a primary structure, these lightweight passive devices can effectively reduce the structural vibration response through their nonlinear stiffness properties. In this research, a two-degree-of-freedom NES device is designed using innovative elastomeric bumpers as the critical components providing nonlinear restoring forces. A number of elastomeric bumper configurations are evaluated experimentally, and the effect of geometric bumper parameters is investigated with a focus on their influence on the stiffness properties of the bumper. A NES device employing different bumpers is then implemented on a 6-story model building and tested using impulse-like base motion. Nonlinear system identification of the NES device shows that nonlinear stiffness properties are achieved using the elastomeric bumpers. Shake-table testing of the building equipped with the NES device demonstrates that the device is capable of dissipating and redistributing the induced vibration energy in a rapid, effective, and robust fashion.