Results 151 to 160 of about 433 (168)
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2017
One of the common failure modes of the diesel engine turbochargers is high-cycle fatigue of the turbine-wheel blades. Mistuning of the blades due to the casting process is believed to contribute to this failure mode. A laser vibrometer is used to characterize mistuning for a population of turbine wheels through the analysis of the blade-response to ...
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One of the common failure modes of the diesel engine turbochargers is high-cycle fatigue of the turbine-wheel blades. Mistuning of the blades due to the casting process is believed to contribute to this failure mode. A laser vibrometer is used to characterize mistuning for a population of turbine wheels through the analysis of the blade-response to ...
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Computation of Mistuning Effects on Cascade Flutter
AIAA Journal, 2000A computational method is described for predicting eutter of turbomachinery cascades with mistuned blades. Themethodsolves theunsteadyEuler/Navier‐Stokesequationsformultiple-bladepassageson aparallel computer usingthemessagepassinginterface. Asecond-orderimplicit schemewithdualtime-steppingand multigrid isused.
Mani Sadeghi, Feng Liu
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Journal of Turbomachinery, 2015
New geometric mistuning modeling approaches for integrally bladed rotors (IBRs) are developed for incorporating geometric perturbations to a fundamental disk–blade sector, particularly the disk–blade boundary or connection. Reduced-order models (ROMs) are developed from a Craig–Bampton component mode synthesis (C–B CMS) framework that is further ...
Joseph A. Beck +4 more
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New geometric mistuning modeling approaches for integrally bladed rotors (IBRs) are developed for incorporating geometric perturbations to a fundamental disk–blade sector, particularly the disk–blade boundary or connection. Reduced-order models (ROMs) are developed from a Craig–Bampton component mode synthesis (C–B CMS) framework that is further ...
Joseph A. Beck +4 more
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Binaural beats of mistuned consonances
The Journal of the Acoustical Society of America, 1994In a previous paper [M. P. Feeney and E. M. Burns, J. Acoust. Soc. Am. 93, 2346(A) (1993)] data on the detection of dichotic beats of mistuned consonances (BMCs) were presented. The results showed that subjects could detect mistuning from small-integer frequency ratios for simultaneous-dichotic pure-tones in a 2I-2AFC task.
M. Patrick Feeney, Edward M. Burns
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Phantom beats in mistuned chords
The Journal of the Acoustical Society of America, 1983Beats are heard in slightly mistuned musical intervals. For example, a mistuned fifth with frequencies f1 = 804 Hz and f2 = 1204 Hz will produce 4 beats per second. These beats have been attributed to interaction between the 3rd harmonic of f1 at 2412 Hz and the 2nd harmonic of f2 at 2408 Hz.
J. L. Hall, M. V. Mathews, L. A. Roberts
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Damping Identification for Mistuned Blisks
Volume 5: 22nd International Conference on Design Theory and Methodology; Special Conference on Mechanical Vibration and Noise, 2010A novel structural damping identification method is presented. The approach is robust with respect to measurement noise and makes use of highly effective reduced-order-models (ROMs). Several different methods are currently available for damping identification.
Darren E. Holland +2 more
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Volume 9: Structures and Dynamics: Structural Mechanics & Vibration; Supercritical CO2
Abstract Integrally Bladed Rotors (IBRs) are subject to foreign object damage, wear and tear, and repair processes that may mistune the system through non-uniform geometric perturbations during usage. This mistuning can drastically change an Integrally Bladed Rotor (IBR)’s dynamic characteristics that manifest as increased forced ...
Joseph Beck +3 more
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Abstract Integrally Bladed Rotors (IBRs) are subject to foreign object damage, wear and tear, and repair processes that may mistune the system through non-uniform geometric perturbations during usage. This mistuning can drastically change an Integrally Bladed Rotor (IBR)’s dynamic characteristics that manifest as increased forced ...
Joseph Beck +3 more
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Capturing Mistuning Within Shrouded Integrally Bladed Disks With the Generalized Model of Mistuning
Volume 9: Structures and Dynamics: Structural Mechanics & Vibration; Supercritical CO2Abstract Bladed disks and blisks are designed to be cyclic structures that ideally have identical sectors. There will, however, always be mistuning, which is blade to blade differences that break the cyclic symmetry of the system and can result in an increase in vibrational amplitudes.
Troy Krizak, Kiran D'Souza
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Volume 7B: Structures and Dynamics, 2013
New geometric mistuning approaches for integrally bladed rotors (IBRs) are developed for incorporating geometric perturbations to a fundamental disk-blade sector, particularly the disk-blade boundary, or connection. The developed Reduced Oder Models (ROMs) are formulated from a Craig-Bampton component mode synthesis (C-B CMS) framework that is further ...
Joseph A. Beck +3 more
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New geometric mistuning approaches for integrally bladed rotors (IBRs) are developed for incorporating geometric perturbations to a fundamental disk-blade sector, particularly the disk-blade boundary, or connection. The developed Reduced Oder Models (ROMs) are formulated from a Craig-Bampton component mode synthesis (C-B CMS) framework that is further ...
Joseph A. Beck +3 more
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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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