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>Load adjusted design of the bevel gear stage of azimuthing thrusters: Modern methods of gear calculation applied to a thruster drive train of a research vessel
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Load adjusted design of the bevel gear stage of azimuthing thrusters: Modern methods of gear calculation applied to a thruster drive train of a research vessel
Drive trains of professional vessels like tugboats, supply vessels and specialised research vessels as well as cruising ships are more and more realized using azimuthing thrusters. Indirectly driven ones have at least one bevel gear stage between the vertical intermediate and the propeller shaft. In the past, some gear stages failed by breakages although the corresponding calculations during the design phase indicated a sufficient safety margin against pitting, tooth root breakage as well as flank breakage using currently available calculation approaches. These circumstances lead to the endeavour to find reasons for the unexpected failures. For this purpose the mechanism of the breakage as well as the responsible stress condition are questioned. Further on a suitable strength hypothesis including the necessary material parameters is investigated. Beside the theoretical investigations several experimental tests are performed in order to gain knowledge about the failure mechanism and to validate the theoretical understanding. The first fundamental tests are performed on spur gear test benches. At this, hardness properties, material and tooth geometry get varied. At a later stage several tests on a bevel gear test bench are performed to transfer the methodology from geometrically simple to more complex tooth designs.
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