35 research outputs found
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
Qualitative Analysis of Forced Response of Blisks With Friction Ring Dampers
A damping strategy for blisks (integrally bladed disks) of turbomachinery
involving a friction ring is investigated. These rings, located in grooves
underside the wheel of the blisks, are held in contact by centrifugal loads and
the energy is dissipated when relative motions between the ring and the disk
occur. A representative lumped parameter model of the system is introduced and
the steady-state nonlinear response is derived using a multi-harmonic balance
method combined with an AFT procedure where the friction force is calculated in
the time domain. Numerical simulations are presented for several damper
characteristics and several excitation configurations. From these results, the
performance of this damping strategy is discussed and some design guidelines
are given
SciPy 1.0: fundamental algorithms for scientific computing in Python.
SciPy is an open-source scientific computing library for the Python programming language. Since its initial release in 2001, SciPy has become a de facto standard for leveraging scientific algorithms in Python, with over 600 unique code contributors, thousands of dependent packages, over 100,000 dependent repositories and millions of downloads per year. In this work, we provide an overview of the capabilities and development practices of SciPy 1.0 and highlight some recent technical developments
Mistuning identification for industrial blisks based on the best achievable eigenvector
International audienceThis paper presents a method of mistuning identification for turbomachinery blisks (integrally bladed disks) from measurements of the system modes and natural frequencies. The procedure is based on the "Best Achievable Eigenvectors" of all measured modes simultaneously combined with a regulation technique. Four illustrative numerical simulations, based on a reduced-order model of the blisk, are given which demonstrate that this technique produces acceptable mistuning identification. To do so, a finite element model of the bladed disk and a computational reduced-order modelling technique, based on component-mode substitution method and combined with a cyclic characteristic of the blade assembly, are developed. Moreover, sensibility coefficients of the mistuning parameter with respect to measured data are derived
Mistuning Identification and Model Updating of an Industrial Blisk
International audienceThe results of a complete study of mistuning identification on an industrial blisk are presented. The identification method used here is based on a model-updating technique of a reduced order. This reduced-order model is built using component mode synthesis, and mistuning is introduced as perturbations of the cantilevered-blade modes. The measured modal data are extracted from global measurements of the blisk's forced response. As we use a single point excitation, this measurement procedure allows the acquisition of all the modes of a given family with a quite simple experimental set-up. A selection of the best identified modal data is finally performed. During themistuning identification procedure, these measured data are regularized using an eigenvector assignment technique which reduces the influence of eventual measurement errors. An inverse problem, based on the perturbed (mistuned) modal equation, is defined with measured modes as input and mistuning parameters as unknown. Then, the reducedorder model is updated with the identified mistuning, we first perform a correlation on modal responses (using eigenfrequency deviation criteria and MACs). Finally, correlation results on forced responses are presented and discussed