CHARACTERISTICS OF WAVE PROPAGATION AND VIBRATION FRACTAL IN FLOWING GRANULAR MEDIA
流动散体中波的传播规律与振动分形特征

The vibration acceleration signals at initial stage and steady stage in flowing granular media are tested,and the propagation of wave in the flowing field is analyzed. The flowing granular media are taken as weak transverse isotropic media,and the phase velocity expressions of P wave,SH wave and SV wave are deduced accordingly. Their propagation characteristics in flowing granular media are analyzed. Compared to normal ore drawing,the eccentricity of ellipsoid,the viscosity resistance and inner friction among granules and shear intensity of granules are decreased,and the loosening coefficient of granules is increased in vibration ore drawing,so the granules have better fluidity. The motions of granules by vibration are irregular,complicated and stochastic,so it has fractal characteristics,which is analyzed and simulated.