Bevel-helical gearboxes B4 seal Side Radial shaft seal with dryrunning prot B4-VH9A

Flender/Flender Gear Units/Bevel-helical gearboxes B4

t few signicant outliers do not completely dominate the discrepancy signal. The likelihood values of outliers in gures 1 () and () are so large (and subject to such variance) that the likelihood (compared to the log likelihood) synchronous averages would be very noisy and difcult to interpret. The NLL synchronous averages are also more linearly proportional to the magnitude of the fault induced damage. 1.9.9 () gear tooth nr.NLL 5.9.9 () pinion tooth nr.NLL 1.9.9 () gear tooth nr.NLL 5.9.9 () pinion tooth nr.NLL 1.5 () gear tooth nr.NLL 5.5 () pinion tooth nr.NLL 1.5 () gear tooth nr.NLL 5.5 () pinion tooth nr.NLLFigure 1: The NLL synchronous averages for the 0.5 Hz sinusoidal time-varying load condition, as computed with respect to the gear for progressive stages of damage (), (), () and (), and as computed with respect to the pinion for progressive stages of wear (), (), () and (). Please notice that the -axes on ()-() are scaled different to those of ()-(). The NLL synchronous averages for the 0.5 Hz sinusoidal uctuating operating as computed with respect to the gear for progressive stages of damage are depicted in gures 1 (), (), () and (), and as computed with respect to the pinion for progressive stages of wear are depicted in (), (), () and (). The initial (rst stage) damage on the gear results in very small NLL values. For this reason the -axes on gures 1 ()-() are magnied compared to the later stages of damage depicted in ()-(). The damage condition is fairly simple to interpret and the presence of damage of the gear is quite evident. The results obtained for the other loading conditions proved conceptually very similar to the presented results for the 0.5 Hz sinusoidal loading condition. Future research should be conducted to investigate the methodology under greater time-varying operating conditions. 5. Conclusion This paper proposed novel gear condition monitoring method which comprise two steps: Firstly NLL transform of vibration signal is computed