fault density
2.Abstract: Analysis on core samples of 3 mine areas in Huaibei-Huainan Coalfield,Anhui Province shows that the Bottom Aquifers of thick Cenozoic formation in each area are different in gravel lithology and fine grain mineral composition.Morphology and size parameters manifest paleo-transpot-agents of the sediments high-energy,high-density and temporality.It is proved that the Bottom Aquifer was composed of diluvial-alluvial deposition and beds bearing gravel were mainly formed by rapid mud-rock flow in fault basins during Miocene epoch when the paleoclimate was warm and dry.
3.Using vibration acceleration data sets of the gearbox, intrinsic mode functions (IMFs) and their power spectrum density(PSD) extracted with EMD and Fourier analystical techniques. Furthermore, the effective gear fault indexes of the IMF and PSD on 216 frequency band (IMFPSD216) based on the 2nd IMF components(IMF2) and its PSD, and the IMF using filter (IMFFLT) based on IMF2 and its filtered statistical signal, are given.
