Parametric studies on the measurements of damping quantities

Abstract

Damping is a property of a structure or specimen which describes how rapidly a mode of vibration decays once it is excited. The energy dissipation due to damping mechanism in the system or specimen is a complex phenomenon which depends on many parameters. There is usually significant variation in the measured damping quantity. The parametric studes were performed to investigate the effect of sensitive parameters on the measured damping quantities; air and water, temperature, frequency and boundary conditions. The type of excitation used was random noise. A flat plate configuration was used to minimize extraneous energy losses (i.e. joints) associated with built-up structure. The wide range of excitation frequencies is considered to understand the frequency-dependent damping characteristics in both air and water media. As a results of investigation, the sensitivities of damping quantities were tabulated and discussed.