Models for blisks with large blends and small mistuning

Tang, Weihan; Epureanu, Bogdan I.; Filippi, Sergio

doi:10.1016/j.ymssp.2016.10.019

Cited by 33 publications

(11 citation statements)

References 17 publications

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“…(12)) using a series expansion representation. Specific methods also exist for creating ROMs for large mistuning effects where the mistuned modes may no longer be captured by the tuned modes [5,10,34,[129][130][131][132]. These cases usually arise due to large differences in geometry across structures for example due to missing material.…”

Section: Dynamic Reduction and Probabilisticmentioning

confidence: 99%

Dynamic Modeling and Projection-Based Reduction Methods for Bladed Disks With Nonlinear Frictional and Intermittent Contact Interfaces

Mitra

Epureanu

2019

Applied Mechanics Reviews

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Turbine bladed disks or blisks, which constitute critical components of most modern turbomachinery, are known for their complex vibratory behavior. The nonlinear dynamics observed in most operational regimes of blisk with contact interfaces are dominated by one of two typical contact behaviors. Frictional contacts are dominated by Coulomb friction forces, while intermittent contacts are characterized by multiple separation events. Other factors such as the dispersion in material or geometric properties across blades, known as mistuning, also affect the dynamics significantly. Presently, probabilistic analysis is the widely accepted design methodology to account for mistuning, which is unknown prior to manufacture. Thus, reduced order modeling of these blisks is essential as high fidelity models are prohibitively expensive for such simulations. This paper provides a technical discussion of dynamic modeling and reviews projection-based techniques used for creation of reduced models of blisks with contacts.

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Section: Dynamic Reduction and Probabilisticmentioning

confidence: 99%

Dynamic Modeling and Projection-Based Reduction Methods for Bladed Disks With Nonlinear Frictional and Intermittent Contact Interfaces

Mitra

Epureanu

2019

Applied Mechanics Reviews

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“…Although bladed disk assemblies have been studied for many years, the studies on multiblade packet vibrations are generally limited to the use of finite element methods or other mathematical methods, e.g., see [12,13] and a review in [14]. Relatively little attention has been devoted to experimental investigation of blade packets.…”

Section: Introductionmentioning

confidence: 99%

High Frequency Modal Testing of the Multiblade Packets Using a Noncontact Measurement and Excitation System

Liu

Zang

et al. 2020

Shock and Vibration

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High cycle failure of blades and vanes caused by the vibration is one of the major causes reducing the lifetime of turbomachines. For multiblade packets, the failure may occur at vibrations with high frequencies that can reach up to tens of kHz. The experimental modal testing of blades is crucial for the validation of numerical models and for the optimization of turbomachine design. In this paper, the test rig and procedure for measurements of dynamic characteristics of lightweight multiblade packets in wide and high frequency ranges are developed. The measurements are based on a noncontact excitation and noncontact measurement method, which allows the determination of the modal characteristics of the packets with high accuracy in wide frequency ranges. The responses of the multiblade packets are measured using a Scanning Laser Doppler Vibrometry (SLDV), while vibrations are excited by the acoustic excitation technique. Modal tests of the blade packet comprising 18 vane blades connected by shrouds are performed. The measurements are performed within the high frequency range of 0–30 kHz, and the natural frequencies and mode shapes are obtained for first 97 modes. To capture the complex high frequency blade mode shapes, each blade in the packet is scanned over 25 reference points uniformly distributed over the blade concave surface. In order to obtain the high frequency resolution, the frequency range used for the measurements is split into several frequency intervals accordingly to the number of spectral lines available in the used data acquisition system, and for each such interval, the test is performed separately. The finite model of the packet is created, and the numerical modal analysis is performed to compare the calculated natural frequencies and mode shapes with the experimental measurements. The comparison shows the satisfactory with those from finite element analysis. It illustrates the measurement method described in this work is effective and reliable.

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“…Joannin et al [25] established a nonlinear model and investigated the influence of dry friction on mistuned bladed disk. In addition to the above researches, the contact interface of shrouded bladed disk, localization of vibration energy, and probabilistic dynamic behavior were analyzed [26][27][28][29]. The frequency-perturbation, random excitations, optimization, identification, the dynamic behaviors, aerodynamic effects, the robustness, interstage coupling, and Coriolis force were conducted [30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Application of Improved Dynamic Substructure Finite Element Model-Based State-Space Techniques in Mistuned Blisks

Bai

Zhang

Guangwei

et al. 2020

International Journal of Aerospace Engineering

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Aeroengine is a complex mechanical equipment, and it works at high temperature, pressure, rotational-speed, and severe loads. One of the core problems is that the vibration and mistuning of bladed disk lead to failure and affect the safety and reliability of aeroengine. Previously, one sector taken as the research object is not suitable; the integrally mistuned bladed disk (blisk) is taken as the research object is very necessary; however, the computational efficiency of mistuned blisk is very low. Therefore, a reduced-order model approach, i.e., an improved dynamic substructure finite element model-based state-space technique (IDSFEM-SST), is proposed to investigate the mistuned blisk. Firstly, the reduced-order substructure finite element model is established by this method, and then, the modal frequencies and modal strain energy amplitudes are investigated. Secondly, the maximum displacement responses are analyzed. Finally, the computational efficiency and accuracy of mistuned blisk via IDSFEM-SST is compared with that of the classical dynamic substructure finite element model and the high-fidelity finite element model to verify the effectiveness of this approach. This study has significance to the dynamic research and engineering practices for complex mechanical structures.

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Models for blisks with large blends and small mistuning

Cited by 33 publications

References 17 publications

Dynamic Modeling and Projection-Based Reduction Methods for Bladed Disks With Nonlinear Frictional and Intermittent Contact Interfaces

Dynamic Modeling and Projection-Based Reduction Methods for Bladed Disks With Nonlinear Frictional and Intermittent Contact Interfaces

High Frequency Modal Testing of the Multiblade Packets Using a Noncontact Measurement and Excitation System

Application of Improved Dynamic Substructure Finite Element Model-Based State-Space Techniques in Mistuned Blisks

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