Intentional Mistuning Design Space Reduction Based on Vibration Energy Flow in Bladed Disks

Lim, Sang-Ho; Castanier, Matthew P.; Pierre, Christophe

doi:10.1115/gt2004-53873

Cited by 11 publications

(5 citation statements)

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“…Another example is the use of vibration power flow analysis 81 to examine the exchange of vibration energy among blades. 22,82,83 Such an alternative formulation can also be used as a preprocessor (e.g., to identify operating conditions that can cause high blade forced response) or as a complement to finite element-based reduced-order models.…”

Section: Fundamental and Alternative Modelsmentioning

confidence: 99%

“…Choi et al 131 and Hou and Cross 134 considered the optimization of intentional mistuning patterns in order to reduce forced response amplitudes. Lim et al 82 proposed some rules for reducing the design space for intentional mistuning, so that a small set of promising intentional mistuning patterns can be identified without requiring a full optimization process. The effectiveness of intentional mistuning has also been validated experimentally in recent studies for the case of a square-wave pattern 135 and a linear pattern.…”

Section: B Mistuning Patterns and Intentional Mistuningmentioning

confidence: 99%

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Modeling and Analysis of Mistuned Bladed Disk Vibration: Current Status and Emerging Directions

Castanier

Pierre

2006

Journal of Propulsion and Power

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360

198

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The literature on reduced-order modeling, simulation, and analysis of the vibration of bladed disks found in gas-turbine engines is reviewed. Applications to system identification and design are also considered. In selectively surveying the literature, an emphasis is placed on key developments in the last decade that have enabled better prediction and understanding of the forced response of mistuned bladed disks, especially with respect to assessing and mitigating the harmful impact of mistuning on blade vibration, stress increases, and attendant high cycle fatigue. Important developments and emerging directions in this research area are highlighted. I. Introduction T URBINE engine rotors, or bladed disks, are rich dynamical systems that are known to suffer from severe vibration problems. Although a bladed disk is typically designed to have identical blades, there are always random deviations among the blades caused by manufacturing tolerances, wear, and other causes. This is called mistuning. Even though mistuning is typically small (e.g., blade natural frequency differences on the order of a few percent of the nominal values), mistuned bladed disks can have drastically larger forced response levels than the ideal, tuned design. The attendant increase in stresses can lead to premature high cycle fatigue (HCF) of the blades. HCF is a major cost, safety, and reliability issue for gas-turbine engines. For example, in 1998 it was estimated by the U.S. Air Force that about 55% of fighter jet engine safety Class A mishaps (over $1 million in damage or loss of aircraft) and 30% of all jet engine maintenance costs were due to HCF. 1 It is clearly of great interest to be able to predict-and, ultimately, to reduce-the maximum blade response as a result of mistuning. The comprehensive modeling, analysis, and understanding of bladed disk vibration is thus critical to reducing the occurrence of HCF and improving the performance and reliability of turbine engines. Bladed disk vibration first received significant attention from the research community in the late 1960s and the 1970s. Notable early work was done by Whitehead, 2 Wagner, 3 Dye and Henry, 4 and Ewins. 5−8 The bladed disk vibration literature has been surveyed by Srinivasan 9,10 and Slater et al. 11 The 1997 survey by Srinivasan 10 Matthew P. Castanier is an Associate Research Scientist in the Department of Mechanical Engineering at the University of Michigan. He received his Ph.D. in Mechanical Engineering from the University of Michigan in 1995. His research interests are in the area of structural dynamics and vibration, including reduced-order modeling, low-to mid-frequency vibration and power flow in complex structures, localization and related phenomena in periodic or cyclic structures, and vibration of mistuned bladed disks in turbine engines. Christophe Pierre is Dean of the Faculty of Engineering at McGill University in Montréal, where he is also Professor of Mechanical Engineering and holds the Canada Research Chair in Structural Dynamics and Vibration. He ...

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Section: Fundamental and Alternative Modelsmentioning

confidence: 99%

Section: B Mistuning Patterns and Intentional Mistuningmentioning

confidence: 99%

Modeling and Analysis of Mistuned Bladed Disk Vibration: Current Status and Emerging Directions

Castanier

Pierre

2006

Journal of Propulsion and Power

Self Cite

360

198

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“…It is known that the mistuning magnification attains a maximum versus the mistuning level and then becomes comparatively insensitive with respect to additional mistuning. In order to increase the robustness with respect to unintentional and uncertain parameter deviations, it is thus a common strategy to introduce intentional mistuning [11,12,98,67,68]. Mistuning is also known to have a beneficial effect on the aeroelastic stability of blade cascades [72,149,164].…”

Section: Mistuningmentioning

confidence: 99%

Vibration Prediction of Bladed Disks Coupled by Friction Joints

Krack

Salles

Thouverez

2016

Arch Computat Methods Eng

196

124

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The present review article addresses the vibration behavior of bladed disks encountered e. g. in aircraft engines as well as industrial gas and steam turbines. The utilization of the dissipative effects of dry friction in mechanical joints is a common means of the passive mitigation of structural vibrations caused by aeroelastic excitation mechanisms. The prediction of the vibration behavior is a scientific challenge due to (a) the strongly nonlinear and non-uniform contact interactions involving local sticking, sliding and liftoff, (b) topological complexity of the coupled structure, and (c) the multidisciplinary character of the problem associated with the need to account for structural mechanical as well as fluid dynamical effects. The purpose of this article is the overview and discussion the current state of the art of vibration prediction approaches. The modeling approaches in this work embrace the description of the rotating bladed disk, the contact modeling, the consideration of aeroelastic effects, appropriate model reduction techniques and the exploitation of the rotationally periodic nature of the problem. The simulation approaches cover the direct computation of periodic, steady-state externally forced and self-excited vibra

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“…In case of few blades, as wind turbines and helicopter blades, such implementation is not so complicated and can be carried out by adding or reducing blade mass and sequentially balancing. In case of many blades, the practical implementation of deliberate mistuning could be done by using different techniques, described in detail in [3,6,7,14,23].…”

Section: Mistuned Pattern Analysismentioning

confidence: 99%

Control of Rotor-Blade Coupled Vibrations Using Shaft-Based Actuation

Christensen

Santos

2006

Shock and Vibration

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When implementing active control into bladed rotating machines aiming at reducing blade vibrations, it can be shown that blade as well as rotor vibrations can in fact be controlled by the use of only shaft-based actuation. Thus the blades have to be deliberately mistuned. This paper investigates the dynamical characteristics of a mistuned bladed rotor and shows how, why and when a bladed rotor becomes controllable and observable if properly mistuned. As part of such investigation modal controllability and observability of a tuned as well as a mistuned coupled rotor-blade system are analysed. The dependency of the controllability and observability on varying rotational speed and mode shape interaction phenomena between parametric and basis mode shape components are also analysed. Numerical results reveal a limitation of the achievable controllability and observability, once quantitative measures of modal controllability and observability converge toward steady levels as the degree of mistuning is increased. Finally, experimental control results are presented to prove the theoretical conclusions and to show the feasibility of controlling rotor and blade vibrations by means of shaft-based actuation in practice.

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Intentional Mistuning Design Space Reduction Based on Vibration Energy Flow in Bladed Disks

Cited by 11 publications

References 0 publications

Modeling and Analysis of Mistuned Bladed Disk Vibration: Current Status and Emerging Directions

Modeling and Analysis of Mistuned Bladed Disk Vibration: Current Status and Emerging Directions

Vibration Prediction of Bladed Disks Coupled by Friction Joints

Control of Rotor-Blade Coupled Vibrations Using Shaft-Based Actuation

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