Abstract
The sound test of gear sets is usually done with conventional means wherby existing disturbances are recognized only in a subjective way. In recent times the industry has increasingly required the realisation of this task by specific instrumentation. The aim is the integration of an objective sound test of gear sets into the production sequence. Up to now the sounds transmitted through air and solids are measured and recorded as a function in time or frequency domaine. However the evaluation of the results is difficult. In the following, experiments with spiral bevel gear sets will be discussed whereby the dynamic pressure differences of the hydrostatic spindle bearings of the testing machine is used. The measuring results show the basic sources of disturbances and typical modulations which also are reproducible theoretically. The logical interpretation of these modulations provides some view points for the evaluation of quality of running gear sets.
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