When naval ship propulsion gear teeth break, the affected teeth have been 'field dressed', so that the units can be put back into service. Then the gears are rerated to a lower rating and used reliably, at least until replacement elements become available. Using sketches or computers, an estimate is made of the instantaneous total length of contact as the damaged sections go through mesh and the results used as a basis of rerarting the unit. Consideration is given to end reliefs, the location of the damage on the helix and the nature of the field dressing, and acutal material properties. The results of this analysis, together with analysis of the causes of the original failure, provide limits within which the unit can be operated with the same reliability as new.
Rerating damaged naval ship propulsion gears
Neueinstufung von beschädigten Antriebsgetrieben an Marineschiffen
1991
7 Seiten, 5 Bilder, 2 Tabellen, 2 Quellen
Conference paper
English
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