Forced Vibrations of Bladings With the Random Technological Mistuning

Abstract

An approach has been considered for analysis of forced vibrations for randomly mistuned bladed discs. It is based on stochastic reduced basis method and hypothesis of locally distributed mistuning, which could realise in blade-to-blade joints due to the deviation at the assemblage technology. The method gives an essential possibility to make an analysis using one sector model and allows for this case to use of industrial-size sector models of bladings. The numerical researches of steady-state forced vibrations of randomly mistuned bladed disk of a 3-rd stage low pressure cylinder of a steam turbine have been done.