Helical gear Reduction Box H3 flender fludex H3CH-8-C

Flender/Flender Gear Units/Helical gear Reduction Box H3

d by integrating density distribution over specied range of values which the random variable might take on. Probability is always limited to the interval [0-1], while likelihood is not. Consider that the signal segments may be generated in manner similar to the sliding window approach implemented by conventional auto-regressive (AR) lter in time-series analysis. Signal segments are created by moving the window one datum point at time. The AR model does not differentiate between vibration signal segments which are generated at different shaft angular intervals. The output from the AR model is thus completely based on the contextual information which is contained in the previous number of signal datum points. The NLL discrepancy signal implemented in this paper was initially investigated using similar sliding window approach to that employed in conventional time-series analysis. While this approach was seen to work reasonably well, it was later realised that more specic density distribution could be constructed if the signal segments are generated in such manner that it inherently reects knowledge of the structure of the signal. In this paper it is assumed that only single tachometer signal is available. If the tachometer is mounted on the gear shaft, then the gear angular position may be estimated in consistent manner. Since the pinion generally rotates at different frequency than the gear, it will not be known at the start of new measurements which pinion tooth is in mesh. If tachometers are mounted on both the pinion and the gear, or if it is only required to monitor the gear, then unique density models may be constructed for individual gear and pinion angular intervals. In this paper the signal segments are generated such that they correspond to the periodicity of the gear meshing frequency. The number of windows per rotation of the gear is set equal to the number of teeth on the gear. The windows do not overlap, but immediately succeed each other. The