Classical Impact Damper and Pendulum Impact Damper for Potential Civil Engineering Application

Abstract

The classical impact damper (CID) and the pendulum impact damper (PID) are studied for the suppression of horizontal vibrations of civil engineering structures. Experiments on the PID to verify the validity of the mathematical model are done and comparisons with simulation results are provided. Parametric study under harmonic excitation shows that the effectiveness of the CID is sensitive to changes in the amplitude of the excitation. On the other hand, the PID is insensitive to changes in the amplitude of the excitation when its frequency is close to the structural frequency, and it is less sensitive to deviations in tuning than the tuned mass damper (TMD). Comparison of the CID, PID and TMD shows optimum efficiency in terms of mass ratio, under steadystate motion and ideal conditions, to be highest for the TMD and lowest for the PID. Included is a discussion of the practical constraints that may govern the actual choice of damper.

Experimental and analytical investigation of impact dampers in free vibration reduction with coulomb friction

“…The IDs can be classified into the single-unit ID, 3 multiunit ID, 4 particle ID, 5 bean-bag ID, 6 pendulum ID, 7 hanging chain ID, 8 ball and oil damper, 9 resilient ID, 10 non-obstructive impact damping, 11 impact-viscous damper, 12 buffered ID, 13 magneto rheological ID, 14 momentum exchange ID, 15 fine particle ID, 16 piston-based particle damper, 17 linear particle chain ID, 18 particle tuned mass damper 19 and magnetic ID. 20 The IDs are used widely in the engineering applications for many years.…”