Far-field passive vibration isolation of WIB under dynamic machine loads

In order to study the passive vibration isolation effects of wave impeding block(WIB) under dynamic machine load, a 3D finite element model for power machine foundation-WIB-soil is established by using the numerical simulation method. The effects of the buried WIB used for dynamic machine excitation on far field surface vibration transmission barrier are calculated and analyzed, and the influences of different parameters on the vibration isolation effects of the WIB are studied. The results show that under the vertical dynamic machine loads, the WIB installed in the foundation under the protected body has certain barrier effects on the vertical and horizontal vibrations of the surface, and the overall vibration isolation effects is better in the vertical than in the horizontal. Adjusting the thickness, width and buried depth of the WIB has effects on the passive vibration isolation effects. With the increase of the thickness of the WIB, the vibration isolation effects of the surface above the WIB basically increase. When the width of the WIB increases, the barrier region of the surface vibration above the WIB expands. When the depth of the WIB up to 4 times the Rayleigh wavelength, the surface vibration in the region of the WIB will be amplified obviously. When it is shallowly buried, the WIB can effectively block the vibration waves, and the vibration isolation effects behind the WIB are obviously better than those above the WIB.