Abstract
There are some methods to improve vibration strength of the gas turbine engine bevel gearwheels by using the dry friction dampers capable of damping resonance vibrations and operate under extreme conditions. The effectiveness of these dampers depends significantly on an adjustment of their mass-stiffness properties, pressure and other parameters. It is required to under-stand the damper operation laws to make a right choice of the parameters during designing, and that could be addressed by test simulations. This paper provides an acceptability assessment of a mathematical model based on the Coulomb friction linearisation in a damper-to-gearwheel contact within the gas turbine engine. Bevel gearwheels have a complex dimensional mode configuration in the damper contact area, therefore a calculation analysis of dynamic behavior of the linearised gearwheel-damper system was carried out from the nominal contact parameters, such as contact fit, stiffness of the normal elastic members in the contact. It is concluded that the damper slipping and the surface roughness are proportional. The stable solution limits have been defined to minimise the unknown parameters effect on the calculation result when adjusting the damper. The research results are used when adjusting the damper for the aircraft engine gearwheel. The strain-gauging test data were compared to the calculation results for the engine damped gearwheel, an acceptable convergence on damping has been obtained.
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