..., only a single row excites the rotor. The additional downstream row serves as a reflecting wall that reflects physical waves, which leads to interference. The second section of this paper describes the details of the in-house mistuning code utilized to predict the blade responses of the individual...

...-order mode crossing. This crossing occurs at a slower speed, and higher-order crossings are difficult to predict due to their low response for this configuration. The paper focuses on the multi-row interaction at multiple operating points and the mistuned blade response prediction. The computational...

...Proceedings of ASME Turbo Expo 2022 Turbomachinery Technical Conference and Exposition GT2022 June 13-17, 2022, Rotterdam, The Netherlands GT2022-79761 Effect of system mode and structural damping perturbation on the mistuned forced response and aerodynamic damping of embedded compressor rotors...

... Abstract Although modern turbomachinery design relies on the tuned blades assumption, mistuning (blade-to-blade variations within each blade row) is known to affect significantly the aeroelastic performance. The structural (frequency) mistuning has been studied extensively in the past, while...

... Abstract A radial turbine impeller of an exhaust turbocharger is analyzed in view of both free vibration and forced response. Due to random blade mistuning resulting from unavoidable inaccuracies in manufacture or material inhomogeneities, localized modes of vibration may arise, which involve...

... located at the Zucrow Laboratory at Keywords: Compressor, Forced Response, Multi-Row, Mistuning, Purdue University. The current paper first addresses the steady Stator Hub Cavities, CFD aerodynamics of a multi-row compressor with hub cavities and talks in detail about the effect of cavities...

...Abstract Abstract This paper focusses on predicting the mistuned forced response behavior of an embedded compressor rotor blade row in a 3.5 stage axial compressor. The authors in previous papers studied the multi-row influence on the forcing function for multiple operating conditions...

... Proceedings of ASME Turbo Expo 2021 Turbomachinery Technical Conference and Exposition GT2021 June 7-11, 2021, Virtual, Online GT2021-59283 MISTUNING AND DAMPING OF A RADIAL TURBINE WHEEL. PART 1: FUNDAMENTAL ANALYSES AND DESIGN OF INTENTIONAL MISTUNING PATTERN Alex Nakos Bernd Beirow Brandenburg...

... for the additional effect of mistuning remains a big challenge in the community. In this paper, the structure is mistuned through the friction coefficient of the dampers and not by altering its geometry, as is usually done in the literature. First, assuming a cyclic symmetric structure, the performance...

... load is large and the variability of frequency is large. friction damper turbine blade contact stiffness of damper variability of frequency mistuning Proceedings of ASME Turbo Expo 2021 Turbomachinery Technical Conference and Exposition GT2021 June 7-11, 2021, Virtual, Online GT2021-58445...

... of interference between the stator and IGV wakes was determined as well. The 4-row case helped investigate physical wave reflections off a downstream rotating row, which had a significant influence on the modal force. The final section of the paper focuses on the mistuning response, which essentially couples...

...ON A NEW NONLINEAR REDUCED-ORDER MODEL FOR CAPTURING INTERNAL RESONANCES IN INTENTIONALLY MISTUNED CYCLIC STRUCTURES Samuel Quaegebeur(a,b Benjamin Chouvion(a), Fabrice Thouverez(a), Loïc Berthe(b) (a) Ecole Centrale de Lyon, LTDS UMR 5513 69130 Ecully France (b) Safran Helicopters Engines 64511...

...Abstract Abstract This paper presents experimental and numerical investigation of mistuned forced responses of an integrally bladed disk with full set of underplatform dampers (UPDs). This research aims at providing: 1. An experimental benchmark for nonlinear dynamics of a mistuned bladed...

... exhibit random mistuning of the blade stiffnesses, and, finally, disks exhibiting random mistuning of both blade stiffness and of the friction forces of the dampers. This latter situation is considered to include the variability induced by manufacturing and wear on the friction dampers. In all cases...

... 1 Copyright © 2012 by ASME Proceedings of ASME Turbo Expo 2012 GT2012 June 11-15, 2012, Copenhagen, Denmark GT2012-68084 INVESTIGATIONS ON MAXIMUM AMPLITUDE AMPLIFICATION FACTOR OF REAL MISTUNED BLADED STRUCTURES David Hemberger IHI Charging Systems Internatl. 69126 Heidelberg, Germany d.hemberger...

... In the design of gas turbine engines, the analysis of nonlinear vibrations of mistuned and frictionally damped blade-disk assembly subjected to random excitation is highly complex. The transitional probability density function (PDF) for the random response of nonlinear systems under white...

... is studied into two situations without or with mistuning. Key words: bladed disk, forced response, Coriolis effect, travelling wave response, mistuning 1 INTRODUCTION High cycle fatigue (HCF) is caused by the excitations applied to rotating parts of gas-turbine engine as they are exposed to stationary...

... 11 01 2011 This paper focuses on the determination of the maximum amplification of blade response due to mistuning in multi stage assemblies. The modal optimization strategy developed earlier in connection with single stage models is extended here to multi stage configurations...

... of freedom (DOFs). Developed bladed disk model is able to take into account external excitation forces phase lag caused by difference between number of rotor and stator blades. Also presence of mistuning was considered. It was shown that certain level of mistuning can directly affect cracked blade...

... 23 02 2010 I e h in 7 9 9 e approach and a local modeling of the interface. Then, both model and data uncertainties are introduced in this model using the nonparametric stochastic that indic mistuned frequenci blade fre a higher a Keywo stochastic INTROD The e geometri and force number o...