Targeting a compressor dovetail structure

the finite element model of blade-disc based on software ANSYS was established. The pulse force was used to simulate the rubbing force under local rubbing condition and the effects of two rubbing conditions on contact characteristics of dovetail structure were analyzed. The first condition involved the influence of different rotating speeds on contact characteristics of dovetail structure when the intrusion was constant. The other condition involved the influence of different intrusions on contact characteristics of dovetail structure when the rotating speed was constant. The results show that the maximum contact pressure and the maximum sliding distance of dovetail structure increase with the rotating speed

the variation law of the maximum contact pressure becomes more complicated

but the variation law of the maximum contact sliding distance becomes gradually steady and the change of amplitude between the maximum contact sliding distance decreases. The maximum contact pressure and the maximum sliding distance of dovetail structure increases with the intrusions

but excessive intrusions will lead to the mutation of the maximum contact sliding distance. By analyzing the spectrums of contact pressure and contact sliding distance under different working conditions

it can be seen that the amplitude of multiple frequencies increase when these multiple frequencies are close to natural frequencies of the blade.