Open AccessJournal Article
Numerical research on rub-impact fault in a blade-rotor-casing coupling system
TLDR
In this article, a dynamic model of a single-span blade-rotor-casing coupling system is established based on finite element (FE) method, where the bearing, bladed rotor, discs and casing are simulated using spring-damping element, beam element, shell element and beam element suitable for curved beam separately.Abstract:
Based on finite element (FE) method, a dynamic model of a single span blade-rotor-casing coupling system is established. The bearings, bladed rotor, discs and casing are simulated using spring-damping element, beam element, shell element and beam element suitable for curved beam separately (the casing stiffness and damping using spring-damping element). The blade-casing rub-impact is simulated using point-point contact elements; here the corresponding nodes of the blades and the casing are identified as the contact points. To deal with contact constraint conditions and simulate blade-casing frictional characteristics, the augmented Lagrangian method and the coulomb friction model are adopted, respectively. The responses of the system are analyzed under two loading conditions by using variable-step Newmark-β integral method combined with Newton-Raphson iteration. The results show that the rub-impact at the second critical speed (case 2) is more serious than that at the first critical speed (case 1). 4× (× denotes the rotating frequency) and its edge frequency components, combination frequency components about 1× can be viewed as distinguishable rub-impact features for cases 1 and 2, respectively. Results can provide theoretical basis for rub-impact diagnosis in blade-rotor-casing coupling systems.read more
Citations
More filters
Journal ArticleDOI
Nonlinear vibration response analysis of a rotor-blade system with blade-tip rubbing
TL;DR: In this paper, an improved rotor-blade dynamic model is developed based on Ma et al.'s previous works, where the shaft is discretized using a finite element method and the effects of the swing of the rigid disk and stagger angles of the blades are considered.
Journal ArticleDOI
A review on dynamic characteristics of blade–casing rubbing
TL;DR: In this paper, a review on the dynamic characteristics of the blade, rotor, and casing as well as the mechanism of coating wear when the rubbing between the blade and bare or coating casings occurs is provided.
Journal ArticleDOI
Vibration response analysis of blade-disk dovetail structure under blade tip rubbing condition
TL;DR: In this article, the effects of the rubbing under different rotating speeds and penetration depths on the blade vibration response and contact behaviors of dovetail interface are analyzed and the results show that the rubbing will cause amplitude amplification phenomenon when the multiple frequency components are close to the first bending and first torsion natural frequencies.
Journal ArticleDOI
A dynamic model for simulating rubbing between blade and flexible casing
TL;DR: In this paper, a new blade-casing rubbing model is proposed, where the blade is assumed to be clamped on a rigid disk and simulated by the twisted-shape plate model with a stagger angle, while the casing is simulated by a cylindrical shell model.
Journal ArticleDOI
The numerical modeling of rotor–stator rubbing in rotating machinery: a comprehensive review
K. Prabith,I. R. Praveen Krishna +1 more
TL;DR: A comprehensive review of different numerical models of rotor–stator rubbing with respect to their ability in simulating the actual response characteristics and a detailed description of contact modeling is presented.
References
More filters
Journal ArticleDOI
An augmented lagrangian treatment of contact problems involving friction
Juan C. Simo,Tod A. Laursen +1 more
TL;DR: In this paper, a framework is presented within which the augmented Lagrangians is readily applied to problems involving contact with friction, which is well-suited to finite element implementation, and a set of numerical examples is presented in which the utility of the method is demonstrated even in the presence of finite deformations and inelasticity.
Journal ArticleDOI
Rotor-to-stationary element sub-related vibration phenomena in rotating machinery: literature survey
TL;DR: Vibrations dues au frottement entre rotor and stator dans les machines tournantes. Analyse de la litterature parue sur le sujet as discussed by the authors.
Journal ArticleDOI
Dynamic characteristics of a flexible bladed-rotor with Coulomb damping due to tip-rub
TL;DR: In this article, a system of equations for a fully-bladed flexible rotor (shaft and disk) supported by a set of bearings at multiple locations is derived for hard rub with Coulomb friction.
Journal ArticleDOI
Fixed-point rubbing fault characteristic analysis of a rotor system based on contact theory
TL;DR: In this paper, the fault characteristics of a single span rotor system with two discs are investigated when the rubbing between a disc and an elastic rod (a fixed limiter) occurs, and the simulation results show that different rotor motions appear, such as period-one motion (P1), P2 and P3 with increasing rotating speeds, which are in agreement with the experimental measurements.
Journal ArticleDOI
Non-linear dynamic response of a rotating radial Timoshenko beam with periodic pulse loading at the free-end
TL;DR: In this paper, the dynamic response of a rotating radial cantilever Timoshenko beam clamped at the hub in a centrifugal force field was derived for coupled axial and lateral motions which included the transverse shear and rotary inertia effects, as well as the hyperbolic wave equation governing the axial motion is coupled with the flexural wave equations governing the lateral motion of the beam through the velocity-dependent skew-symmetric Coriolis force terms.