Cross-axis coupled forces such as those due to Alford and Thomas can produce a whirl instability in a gas turbine rotor. This paper demonstrates the effect of non-isotropic support stiffness and gyroscopic loads on the severity of the instability. Non-isotropy in the support stiffness tends to suppress it; whereas the gyroscopic effect enhances the potential of the rotor for unstable motion at the same time influencing the effectiveness of the support nonisotropy. Simple criteria for a flexible rotor's stability for forward and backward whirls are obtained from the Routh-Hurwitz criteria and given in terms of the required Alford coefficient, which reduces to the required damping when gyroscopic effects are omitted.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.