Results 81 to 90 of about 132 (128)
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Influence of Mistuning on Rotor-Blade Vibrations
AIAA Journal, 1975This analysis is aimed at determining the influence of blade mistiming on the vibratory stress levels of turbine and compressor blades. A frequency response analysis for a given rotor configuration shows that a large number of resonances may occur over a frequency band, the width of which is nearly 20% of the mean blade frequency.
L. E. EL-BAYOUMY, A. V. SRINIVASAN
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Vibration Amplitudes of Mistuned Blades
Journal of Turbomachinery, 1988Due to the mistuning effect, the nominally identical blades on a rotor are forced to vibrate with greatly unequal amplitudes under certain circumstances. It is, therefore, desirable to have the capability of predicting the highest responding blades so that such blades may be instrumented during engine tests.
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Vibration Analysis of a Mistuned Axial Turbine Blisk
Volume 7B: Structures and Dynamics, 2019Abstract An axial turbine blisk for turbocharger applications is analyzed with respect to the effect of intentional mistuning on the forced response. Originally, the intentional mistuning pattern has been designed by employing a genetic algorithm optimization in order to reduce the forced response caused by low engine order excitation ...
Bernd Beirow +3 more
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Maximum Mistuned Vibration Amplitude With Aerodynamic Damping
Volume 7B: Structures and Dynamics, 2016Mistuning can dramatically increase the forced response of a bladed disk. In the case of damping coming from aerodynamic effects the situation is more complicated because the value of the damping is typically different for the different travelling wave modes of the system. This damping variability changes the effect of mistuning, and it can even result
Carlos Martel, Luo Cuiping
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Vibration Characteristics of Mistuned Shrouded Blade Assemblies
Journal of Engineering for Gas Turbines and Power, 1986An investigation of the mode localization phenomenon associated with mistuning is presented for shrouded blade assemblies. The calculations are based on a generic finite element model, which permits modeling of arbitrary mistuning and both slipping and nonslipping shroud interfaces.
N. A. Valero, O. O. Bendiksen
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Vibration Absorbers for a Mistuned Bladed Disk
Journal of Vibration and Acoustics, 2016Mistuning refers to variations in modal properties of blades due to manufacturing tolerances and material defects. This can result in the amplification of a blade vibratory amplitude. This paper deals with the design of vibration absorbers for a mistuned bladed disk. First, the basic theory is established for undamped vibration absorbers using a single-
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Vibration Analyses of an Axial Turbine Wheel With Intentional Mistuning
Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2, 2020Abstract The last stage bladed disk of a steam turbine is analyzed with respect to both flutter susceptibility and limitation of forced response. Due to the lack of variable stator vanes unfavorable flow conditions may occur which can lead to flow separation in some circumstances.
Frederik Popig +3 more
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Resonant Vibration Levels of a Mistuned Bladed Disk
Journal of Vibration and Acoustics, 1984Using a simplified but representative model for a mistuned bladed disk, a series of case studies has been made to examine in detail the influence of various parameters on the resonant response levels of each blade on the disk. Although confined to a specific model of a 33-bladed disk, and thus not attempting to generalize its results, the study ...
D. J. Ewins, Z. S. Han
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Vibration analysis of mistuned bladed-disk assemblies - inverse approach
AIAA Journal, 1994This paper deals with a method that aims at solving the inverse problem where some of the key structural parameters are determined from knowledge of the system's response. This method was applied to the specific case of a 12-bladed disk to determine the range of individual blade cantilever frequency scatter so that all blade responses lay below an ...
Sanliturk, K. Y., Imregun, M.
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Multiwave Vibrations in Mistuned Cascades With Tip-Shroud Friction
Journal of Engineering for Gas Turbines and Power, 2021Abstract Measurements taken during aero engine tests and in the field showed that flutter vibrations of shrouded blades can feature rich wave content (multiwave flutter vibrations). In a previous work, we demonstrated that this behavior can be explained by the nonlinear interaction of aeroelastically unstable traveling wave modes.
Gross Johann, Krack Malte
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