Quantitative analysis on energy dissipation mechanism of non-obstructive particle damping technology

The non-obstructive particle damping (NOPD) technology has been recently developed on the basis of particle damping and impact damping technologies. A quantitative analysis on the dissipation mechanism of NOPD based on statistical theory was presented. Under high-frequency vibrations, the dense granular motion of NOPD is very similar to turbulence. Thus, Kolmogorov's hypothesis in turbulence was adopted to describe the energy spectral density and velocity correlation function of the particles in the NOPD technology. It is shown that the NOPD's mean energy dissipation (per unit mass) increases with the increase of either granular diameter or volume ratio of dense granular flow. The quantitative model for the NOPD technology presented in the paper should be useful in possible engineering applications for vibration reduction.