STUDY ON THE COAL-ROCK INTERFACE RECOGNITION METHOD BASED ON MULTI-SENSOR DATA FUSION TECHNIQUE

The coal-rock interface recognition method based on multi-sensor data fusion technique is put forward because of the localization of single type sensor recognition method. The measuring theory based on multi-sensor data fusion technique is analyzed, and hereby the test platform of recognition system is manufactured. The advantage of data fusion with the fuzzy neural network (FNN) technique has been probed. The two-level FNN is constructed and data fusion is carried out. The experiments show that in various conditions the method can always acquire a much higher recognition rate than normal ones.     

DETECTION OF INCIPIENT LOCALIZED GEAR FAULTS IN GEARBOX BY COMPLEX CONTINUOUS WAVELET TRANSFORM

As far as the vibration signal processing is concemed, composition of vibration signal re-sulting from incipient localized faults in gearbox is too weak to be detected by traditional detectingtechnology available now.The method, which includes two steps: vibraton signal from gearbox is firstprocessed by synchronous average sampling technique and then it is analyzed by complex continuouswavelet transform to diagnose gear fault, is introduced. Two different kinds of faults in the gearbox, i.e.shaft eccentricity and initial crack in tooth fillet, are detected and distinguished from each other suc-cessfully.     

STUDY ON THE LUBRICATION FACTOR OF INVOLUTE SPUR GEARS

Based on a lot of numerical solutions to the problems of the thermal non-Newtonian elasto-hydrodynamic lubrication and some fatigue tests with rollers the lubrication factor of involute spur gears (called gear for short) is investigated. The results suggest that gear lubrication effects bear close relations to a dimensionless parameter D which is synthetically determined by gearing rotational speed,load,material,dimension and lubricant viscosity.When D<8,the gear fatigue life increases as the lubricant viscosity is increased;When D>8,however,the life decreases with the viscosity addition,which is in marked contrast to the lubrication factor Z recommended by the International Standard for Computing Cylindrical Gear Strength.At the end,a set of formulae for calculating gear lubrication factors suitable for different working conditions are advanced.