Abstract
One of the ways to increase the vibration strength gas turbine engine parts is the use of dry friction dampers. The efficiency of such dampers essentially depends on the selection of their mass-rigidity characteristics, pressing force, and other parameters. For the correct choice of these parameters at the design stage, it is necessary both to understand the laws of operation of dampers and to have an adequate mathematical model of the process of interaction between the engine part and the damper. The proposed mathematical model for calculating the efficiency of dry friction dampers is based on the linearization of the described Coulomb friction processes, which is completely true for cases where only the macroslip process is presented. However, real processes of dry friction are also accompanied by microslip processes too. To evaluate the influence of the presence of microslip processes on the damping efficiency, and, as a result, on the accu-racy of the created mathematical model, an experimental assessment of the indirect hysteresis loss loops of the “damper-detail” system was carried out on a model installation. It is concluded that the damper displacement level and the surface roughness are proportional. A possibility to apply linear-ised model to full-scale components was justified by calculations. This includes the possibility to consider the microslip effects simulations and identify ways of the damper adjustment so as to minimise the influence of this effect. The results of the study are taken into account for the damped gearwheel model adjustment.
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