235 research outputs found
Model and Stability Analysis of a Flexible Bladed Rotor
This paper presents a fully bladed flexible rotor and outlines the
associated stability analysis. From an energetic approach based on
the complete energies and potentials for Euler-Bernoulli beams, a
system of equations is derived, in the rotational frame, for the
rotor. This later one is made of a hollow shaft modelled by an
Euler-Bernoulli beam supported by a set of bearings. It is
connected to a rigid disk having a rotational inertia. A full set
of flexible blades is also modelled by Euler-Bernoulli beams
clamped in the disk. The flexural vibrations of the blades as well
as those of the shaft are considered. The evolution of the
eigenvalues of this rotor, in the corotational frame,
is studied. A stability detection method, bringing coalescence and
loci separation phenomena to the fore, in case of an asymmetric
rotor, is undertaken in order to determine a parametric domain
where turbomachinery cannot encounter damage. Finally, extensive
parametric studies including the length and the stagger angle of
the blades as well as their flexibility are presented in order to
obtain robust criteria for stable and unstable areas prediction
Stability Analysis of Beams Rotating on an Elastic Ring Application to Turbo machinery Rotor-Stator Contacts
Summary This paper presents a model of flexible beams rotating on the inner surface of an elastic stationary ring. The beams possesses two degrees of freedom, traction/compression and flexure. The in-plane deformations of the ring are considered and a single mode approximation is used. The model has been developed within the rotating frame by use of an energetic method. To better understand the phenomena occurring, the degrees of freedom of the beams can first be treated separately then together. Stability analysis show that even without rubbing, the radial degree of freedom of a beam rotating on an elastic ring can create divergence instabilities as well as mode couplings of the circular structure. When rubbing is considered, the system is unstable as soon as the rotational speed is non null. Moreover rubbing can couple the beams and the ring giving rise to mode coupling instabilities and locus veering phenomena. Finally, a comparison to a more complicated model of a flexible bladed-rotor in contact with an elastic casing shows a very good accordance with the phenomena occurring
Stability analysis and \mu-synthesis control of brake systems
The concept of friction-induced brake vibrations, commonly known as judder,
is investigated. Judder vibration is based on the class of geometrically
induced or kinematic constraint instability. After presenting the modal
coupling mechanism and the associated dynamic model, a stability analysis as
well as a sensitivity analysis have been conducted in order to identify
physical parameters for a brake design avoiding friction-induced judder
instability. Next, in order to reduce the size of the instability regions in
relation to possible system parameter combinations, robust stability via
\mu-synthesis is applied. By comparing the unstable regions between the initial
and controlled brake system, some general indications emerge and it appears
that robust stability via \mu-synthesis has some effect on the instability of
the brake system
Interactions between docetaxel (Taxotere) and Plasmodium falciparum-infected erythrocytes.
Stability analysis of rotating beams rubbing on an elastic circular structure
This paper presents the stability analysis of a system composed of rotating
beams on a flexible, circular fixed ring, using the Routh-Hurwitz criterion.
The model displayed has been fully developed within the rotating frame by use
of an energy approach. The beams considered possess two degrees of freedom
(dofs), a flexural motion as well as a traction/compression motion. In-plane
deformations of the ring will be considered. Divergences and mode couplings
have thus been underscored within the rotating frame and in order to simplify
understanding of all these phenomena, the dofs of the beams will first be
treated separately and then together. The dynamics of radial rotating loads on
an elastic ring can create divergence instabilities as well as post-critical
mode couplings. Moreover, the flexural motion of beam rubbing on the ring can
also lead to mode couplings and to the locus-veering phenomenon. The presence
of rubbing seems to make the system unstable as soon as the rotational speed of
the beams is greater than zero. Lastly, the influence of an angle between the
beams and the normal to the ring's inner surface will be studied with respect
to system stability, thus highlighting a shift frequency phenomenon
Experimental and Numerical Investigations of a Dual-Shaft Test Rig with Intershaft Bearing
This paper deals with an experimental study of a dual rotor test rig. This
machine, which was developed and built at the Laboratoire de
Tribologie et Dynamique des Systèmes, Ecole Centrale de Lyon, will
be first presented. It is composed of two coaxial shafts that are connected by
an intershaft bearing and rotate independently, each one driven by its own
motor. Their lateral vibrations and whirling motion are coupled by the intershaft
bearing. The experimental tests consisting in run-ups and the associated
measured unbalance response of the dual rotor will be investigated. The
influence of the rotation of each rotor on the critical speeds and the associated
amplitudes will be discussed. Moreover, this paper presents a numerical model
of the dual rotor. Correlations between the experimental and numerical tests will
be investigated. The objective is to be able to predict phenomena observed in
experiments, starting from a rather fine numerical model
The influence of cracks in rotating shafts
In this paper, the influence of transverse cracks in a rotating shaft is
analysed. The paper addresses the two distinct issues of the changes in modal
properties and the influence of crack breathing on dynamic response during
operation. Moreover, the evolution of the orbit of a cracked rotor near half of
the first resonance frequency is investigated. The results provide a possible
basis for an on-line monitoring system. In order to conduct this study, the
dynamic response of a rotor with a breathing crack is evaluated by using the
alternate frequency/time domain approach. It is shown that this method
evaluates the nonlinear behaviour of the rotor system rapidly and efficiently
by modelling the breathing crack with a truncated Fourier series. The dynamic
response obtained by applying this method is compared with that evaluated
through numerical integration. The resulting orbit during transient operation
is presented and some distinguishing features of a cracked rotor are examined
Steady-state response of a random dynamical system described with Padé approximants and random eigenmodes
Designing a random dynamical system requires the prediction of the statistics of the response, knowing the random model of the uncertain parameters. Direct Monte Carlo simulation (MCS) is the reference method for propagating uncertainties but its main drawback is the high numerical cost. A surrogate model based on a polynomial chaos expansion (PCE) can be built as an alternative to MCS. However, some previous studies have shown poor convergence properties around the deterministic eigenfrequencies. In this study, an extended Pade approximant approach is proposed not only to accelerate the convergence of the PCE but also to have a better representation of the exact frequency response, which is a rational function of the uncertain parameters. A second approach is based on the random mode expansion of the response, which is widely used for deterministic dynamical systems. A PCE approach is used to calculate the random modes. Both approaches are tested on an example to check their efficiency
The influence of crack-imbalance orientation and orbital evolution for an extended cracked Jeffcott rotor
Dynamics of a linear oscillator connected to a small strongly non-linear hysteretic absorber
The present investigation deals with the dynamics of a two-degrees-of-freedom
system which consists of a main linear oscillator and a strongly nonlinear
absorber with small mass. The nonlinear oscillator has a softening hysteretic
characteristic represented by a Bouc-Wen model. The periodic solutions of this
system are studied and their calcu- lation is performed through an averaging
procedure. The study of nonlinear modes and their stability shows, under
specific conditions, the existence of localization which is responsible for a
passive irreversible energy transfer from the linear oscillator to the
nonlinear one. The dissipative effect of the nonlinearity appears to play an
important role in the energy transfer phenomenon and some design criteria can
be drawn regarding this parameter among others to optimize this energy
transfer. The free transient response is investigated and it is shown that the
energy transfer appears when the energy input is sufficient in accordance with
the predictions from the nonlinear modes. Finally, the steady-state forced
response of the system is investigated. When the input of energy is sufficient,
the resonant response (close to nonlinear modes) experiences localization of
the vibrations in the nonlinear absorber and jump phenomena
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