Response and stability analysis of a two-spool aero-engine rotor system undergoing multi-disk rub-impact

Prabith, K.; Krishna, I. R. Praveen

doi:10.1016/j.ijmecsci.2021.106861

Cited by 50 publications

(8 citation statements)

References 61 publications

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“…These labyrinth seal fins play a crucial role in enhancing rotor-stator contact conditions and optimizing engine sealing. However, aerodynamic flow conditions in the jet engine often lead to vibratory instability phenomena, consequently impacting engine performance [16]. As an initial step, we simplified the geometry of the problem by substituting labyrinth seal fins with plates, facilitating in-plane deformation measurements.…”

Section: Methodsmentioning

confidence: 99%

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Strains and Stresses in Multilayered Materials Determined Using High-Energy X-ray Diffraction

Geandier,

Adenis,

Selezneff

et al. 2024

Metals

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This work explores the advantages and disadvantages of a methodology using high-energy X-ray diffraction to determine residual stresses in multilayer structures produced by atmospheric plasma spraying. These structures comprise a titanium alloy substrate (Ti64), a bonding layer (Ni-Al), and an abrasive coating (Al2O3). This study focuses on analyzing the residual stress gradients within these layers. The presented method is used to determine stresses across the entire thickness of multilayer structures. Experiments were carried out using a high-energy rectangular beam, operating in transmission mode, on the cross-section of the sample. The results indicate variable stresses throughout the depth of the sample, particularly near the layer interfaces. The semi-automatic methodology presented here enables us to follow stress evolution within the different layers, providing indications of the load transfer between them and at their interfaces. The sin2ψ method was used to analyze the diffraction data and to determine the stresses in each phase along the sample depth. However, interpreting results near the interfaces is complex due to the geometric and chemical effects. We present a discussion of the main advantages and disadvantages of the methodology for this kind of industrial sample.

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Section: Methodsmentioning

confidence: 99%

“…Raw intensity that cannot be below one, above the background, or above the detector capacity (2 16 in the case of the detector used here). • FWHM that cannot be below one 2θ step higher than a value determined by the user (here, 0.5 is very large compared to the expected values).…”

mentioning

confidence: 99%

Strains and Stresses in Multilayered Materials Determined Using High-Energy X-ray Diffraction

Geandier,

Adenis,

Selezneff

et al. 2024

Metals

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“…Based on the Craig-Bampton method [28,30], the dimension reduction process for the full order model (FOM) of the dual-rotor system involves separately reducing the dimension of the LP and HP rotors, and then assembling them together to obtain the ROM of the dual-rotor system. The dynamic equation for a single rotor FOM is as follows ( )…”

Section: The Craig-bampton Methodsmentioning

confidence: 99%

“…Lu et al [27] reduced the dimension of a dual-rotor-bearing system model based on the proper orthogonal decomposition (POD) method, which reduced the time of calculating the nonlinear dynamic response under the misalignment fault of the coupling by using the numerical integration method. Based on the fixed interface component modal synthesis (CMS) method, known as the Craig-Bampton method [28], Jin et al [29] and Prabith et al [30] established a reduced order model (ROM) of a complex dual-rotor-bearing system, and studied the dynamic characteristics under the nonlinear inter-shaft bearing force and rub-impact force respectively, which improved the calculation efficiency while ensuring the calculation accuracy. Considering the local contact nonlinearity of the dry friction system, Petrov et al [31] and Wu et al [32] developed a multi-step dimension reduction method, which greatly reduces the DOF of the model and improves the computational efficiency.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of a dual-rotor-bearing system with active elastic support dry friction dampers

Ouyang,

Cao,

2024

Nonlinear Dyn

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In present study, the modified harmonic balance-alternating frequency/time domain (HB-AFT) method with embedded arc-length continuation method is used to study the nonlinear dynamic characteristics of the dual-rotor-bearing system with active elastic support dry friction damper (ESDFD). The friction on the contact interface between ESDFD moving and stationary disks is described by a two-dimensional (2D) friction contact model. The dynamic model of the dual-rotor is established by the conical Timoshenko beam element and the rigid disk element, while the inter-shaft bearing force is obtained by the Hertz contact model. The reduced order model (ROM) of dual-rotor system is constructed by the Craig-Bampton method. Based on the ROM, the modified HB-AFT method with embedded arc-length continuation procedure is used to solve the periodic solutions of the dual-rotor system under unbalanced excitation. The Floquet theory is employed to determine the stability of periodic solutions. The impact of key parameters such as Hertz contact stiffness and radial clearance of inter-shaft bearing, eccentricity of disk, and modal damping ratio on the primary resonance characteristics and inter-shaft bearing dynamic load of the dual-rotor system are revealed without considering the ESDFD. With considering the ESDFD, the influence of ESDFD normal force on the primary resonance peak and inter-shaft bearing dynamic load of the dual-rotor system is investigated. The optimal normal force and controllable region for ESDFD to control the vibration of the dual-rotor system under the target mode is determined. A control strategy based on altering the normal force within the controllable region is designed. Results show that under the proposed control strategy, the damping effect provided by ESDFD significantly reduces the vibration amplitude of the dual-rotor system and mitigates the dynamic load of the inter-shaft bearing when passing through the resonance region, completely suppresses the bi-stable phenomenon and vibration jump behavior of the dual-rotor system. Thereby reducing the structural damage caused by excessive vibration. This demonstrates promising engineering applications for ESDFD.

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“…In such cases, the flexibility and the deformation of the disk can no longer be ignored. Theoretically, the thin disk can be modeled as an elastic annular thin plate, whose vibration behaviors have been extensively investigated [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Free Vibration Analysis of Spinning Sandwich Annular Plates with Functionally Graded Graphene Nanoplatelet Reinforced Porous Core

Huang

Zhao

et al. 2022

Materials

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This paper conducted the free vibration analysis of a sandwich annular thin plate with whirl motion. The upper and lower faces of the annular plate are made of uniform solid metal, while its core is porous foamed metal reinforced by graphene nanoplatelets (GPLs). Both uniform and non-uniform distributions of GPLs and porosity along the direction of plate thickness which leads to a functionally graded (FG) core are taken into account. The effective material properties including Young’s modulus, Poisson’s ratio and mass density are calculated by employing the Halpin–Tsai model and the rule of mixture, respectively. Based on the Kirchhoff plate theory, the differential equations of motion are derived by applying the Lagrange’s equation. Then, the assumed mode method is utilized to obtain free vibration behaviors of the sandwich annular plate. The finite element method is adopted to verify the present model and vibration analysis. The effects of porosity coefficient, porosity distribution, graphene nanoplatelet (GPL) distribution, graphene nanoplatelet (GPL) weight fraction, graphene nanoplatelet length-to-thickness ratio (GPL-LTR), graphene nanoplatelet length-to-width ratio (GPL-LWR), spinning speed, outer radius-to-thickness ratio and inner radius-to-thickness ratio of the plate, are examined in detail.

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Response and stability analysis of a two-spool aero-engine rotor system undergoing multi-disk rub-impact

Cited by 50 publications

References 61 publications

Strains and Stresses in Multilayered Materials Determined Using High-Energy X-ray Diffraction

Strains and Stresses in Multilayered Materials Determined Using High-Energy X-ray Diffraction

Nonlinear dynamics of a dual-rotor-bearing system with active elastic support dry friction dampers

Free Vibration Analysis of Spinning Sandwich Annular Plates with Functionally Graded Graphene Nanoplatelet Reinforced Porous Core

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