Kerem Ege

Kerem Ege
Institut National des Sciences Appliquées de Lyon | INSA Lyon · Laboratory of Vibrations and Acoustics (LVA - EA 677)

PhD
Assistant Professor (Maître de Conférences, HDR), Laboratoire Vibrations Acoustique, INSA Lyon

About

75
Publications
11,092
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544
Citations
Introduction
I am an Assistant Professor at INSA Lyon (Laboratoire Vibrations Acoustique - Mechanical Engineering Department) since 2010. My main research activities are : -Structural acoustics and vibrations -Composite materials and complex structures, Modeling, Damping identification -Mid- and high- frequency domain vibrations, Sound radiation -Musical acoustics, Mechanics of musical instruments -Non-linear vibrations --> https://cv.archives-ouvertes.fr/keremege
Additional affiliations
September 2010 - present
Institut National des Sciences Appliquées de Lyon
Position
  • Professor (Assistant)
September 2010 - present
Institut National des Sciences Appliquées de Lyon
Position
  • Professor (Assistant)
February 2010 - August 2010
ENSTA ParisTech
Position
  • PostDoc Position
Education
October 2006 - September 2009
École Polytechnique
Field of study
  • Vibroacoustics
September 2005 - April 2006
September 2003 - August 2006
Ecole Centrale de Marseille
Field of study
  • Engineering

Publications

Publications (75)
Article
Full-text available
This paper presents a new wave fitting approach to estimate the frequency dependent material properties of thin isotropic plate structures from an experimentally obtained vibrational field, exciting the plate at a single point. The method projects the measurement data on to an analytical image source model, in which Hankel's functions are used for...
Article
Full-text available
In the context of aeronautics, automotive and construction applications, the design of light multilayer plates with optimized vibroacoustical damping and isolation performances remains a major industrial challenge and a hot topic of research. This paper focuses on the vibrational behavior of three-layered sandwich composite plates in a broad-band f...
Article
Full-text available
This paper presents the modelling and the dynamic characterisation of laminated composite plates and sandwich structures in terms of stiffness and damping. The developments used in this paper are based on the analytical multilayer model of Guyader and Lesueur (JSV, 1978). The model considers linear shear, membrane and bending effects in each layer....
Article
Full-text available
The aim of this paper is to propose a methodology for identifying the pressure field applied on a laminated composite plate from its measured vibration response. The general framework of this study is the Corrected Force Analysis Technique (CFAT), which was previously used on isotropic plates. This method estimates the spatial derivatives of the eq...
Article
Full-text available
This paper deals with the dynamic characterisation of plate structures with elliptical orthotropic stiffness properties, using an equivalent thin plate theory using a wave fitting approach. The method consists in projecting the experimentally determined transverse displacement field of a plate on an analytical Green’s function of an elliptical orth...
Article
Full-text available
This works aims to build an equivalent model of multilayered structures with imperfect interfaces for vibro-acoustic modelling and characterization. To take into account imperfections, new interface conditions including constitutive equations, that describe the imperfections, are implemented. Once the displacement field with imperfect interfaces is...
Thesis
Full-text available
L'objectif de ce mémoire d’Habilitation à Diriger des Recherches est de synthétiser mes travaux de recherches et les problématiques scientifiques que j'ai développées au cours de mon parcours académique, depuis celles émergées lors de mon stage de master recherche à l'ENSTA (IMSIA) puis au cours de ma thèse de doctorat au LMS (X) jusqu'à mes récent...
Article
Full-text available
Condensed models are used to describe the dynamic behaviour of a multilayer structure by means of an equivalent homogeneous layer defined by intrinsic properties. Existing condensed models mainly describe the bending, membrane and shearing motions of the multilayer plate and neglect its dilatational motion. As a result, the transmission loss across...
Conference Paper
Full-text available
Mutli-layered structures (such as sandwich panels) are commonly used in engineering applications for improved sound comfort and noise reduction. Finite Element modelling of these layered structures would often results in increased total number of degrees of freedom which would lead to high computation time. An alternative to the full modelling of m...
Conference Paper
Full-text available
The design of pianos is mainly based on empirical knowledge due to the lack of a tool that could predict sound changes induced by changes of the geometry and/or the mechanical properties of the soundboard. We present the framework of a program for the Computer-Aided Design of piano soundboards that is intended to bridge that gap by giving piano mak...
Article
Full-text available
The High Resolution Wavevector Analysis (HRWA) is presented and its application illustrated. Extending the High Resolution Wavenumber Analysis method [1] to 2D signals, it allows the wide-band and local characterization of the linear elastic behavior of anisotropic plates. The method belongs to the family of experimental wavenumber-based characteri...
Chapter
The vibratory behavior and radiation of complex structures are a real challenge for many industrial domains. The increasing requirements of users and manufacturers justify the interest of the scientific community about this subject, particularly about ribbed structures. Initially, the design of such a structure is led by structural reasons and offe...
Article
With the aim of decreasing CO2 emissions, car producers’ efforts are focused, among others, on reducing the weight of vehicles yet preserving the overall vibrational comfort. To do so, new lightweight materials combining high stiffness and high (passive) damping are sought. For panels essentially loaded in bending, sandwich composites made of two e...
Article
Full-text available
This paper presents an analytical method for modeling the vibro-acoustic behavior of ribbed non-rectangular orthotropic clamped plates. To do this, the non-rectangular plate is embedded in an extended rectangular simply supported plate on which a spring distribution is added, blocking the extended part of the surface, and allowing the description o...
Article
Full-text available
This paper concerns the assessment of the dynamic stiffness of plates using non-contact excitation and non-contact measurements. In particular, a constrained-layer damping sandwich plate is considered, of which the apparent dynamic stiffness as function of frequency is determined. The experimental results compare very well with an analytical model...
Article
Full-text available
Vibro-acoustic simulation in the mid-frequency range is of interest for automotive and truck constructors. The dissipative treatments used for noise and vibration control such as viscoelastic patches and acoustic absorbing materials must be taken into account in the problem. The Statistical modal Energy distribution Analysis (SmEdA) model consists...
Article
Full-text available
This article presents the modeling of a MEMS microphone with an original architecture formed of mechanical structures moving in the plane of the substrate. On the contrary of most microphones generally constituted of an oscillating membrane, some transducers developed by the CEA-LETI with M&NEMS technology use micro beams moving in the plane of the...
Article
Full-text available
This paper is focused on the vibroacoustic behavior of a rectangular ribbed wood panel. This is done by developing an analytical model based on a variational approach, taking into account the kinetic and strain energies of a special orthotropic plate, 11 ribs oriented in a first direction and 1 other strong stiffener oriented in the perpendicular d...
Article
Full-text available
Measurements on vibrating structures has been a topic of interest for decades. Vibrating structures are however generally assumed to behave linearly and in a noise-free environment, which is not the case in practice. This paper provides a methodology that allows for the autonomous estimation of nonlinearities and assessment of uncertainties by boot...
Article
Workshop organisé par Morvan Ouisse et Emmanuel Foltête les 23 et 24 Mars 2015 à l'Institut FEMTO-ST / Département Mécanique appliquée
Conference Paper
Since the strings of a piano cannot radiate sound due to their small sections, the vibrations are transmitted through the bridges to the piano soundboard to increase radiation. This complex structure is made of a main spruce panel ribbed by several beams (ribs) in a direction orthogonal to the grain, and by two curved beams (bridges) in a direction...
Article
This article presents the modeling of aM EMS microphone with an original architecture formed of mechanical structures moving in the plane of the substrate. On the contrary of most microphones generally constituted of an oscillating membrane, some transducers developed by the CEA-LETI with M&NEMS technology use micro beams moving in the plane of the...
Conference Paper
Full-text available
Statistical modal Energy distribution Analysis (SmEdA) can be used to model a fluid-structure-problem based on modal information of the uncoupled-subsystems. Recently the method has been extended to include the effect of a dissipative treatment (i.e. damping or absorbing material). In this paper, SmEdA is tested on a steel plate with/without dampin...
Article
Full-text available
Statistical modal Energy distribution Analysis (SmEdA) can be used as an alternative to Statistical Energy Analysis for describing subsystems with low modal overlap. In its original form, SmEdA predicts the power flow exchanged between the resonant modes of different subsystems. In the case of sound transmission through a thin structure, it is well...
Conference Paper
Full-text available
This paper describes the conception, designs consideration and fabrication process of a novel MEMS microphone. The presented microphone not only uses a new architecture, the sensitive part being beams moving within the plane of the substrate, but also uses an innovative detection means with Silicon piezo-resistive nanogauges. Modelization will cons...
Article
Full-text available
An additive damping treatment is an effective tool to control the dynamic response of built-up structures, and it is widely utilized through industrial applications. By applying a viscoelastic layer on a given structure, the vibratory energy is dissipated through shear and in-plane motions at the layer interface. Modeling the effect of such a treat...
Conference Paper
Full-text available
The miniaturization of microphones is of great interest for several fields, such as medical applications (audio implants), or consumer electronics (cell phones). Almost all existing miniature microphones rely on electrostatic transduction and offer good performances (sensitivity, frequency bandwidth). However, their sensitivity, proportional to the...
Conference Paper
Full-text available
Statistical modal Energy distribution Analysis (SmEdA) may be used as alternative to Statistical Energy Analysis for describing subsystems with low modal overlap. In its original form, SmEdA predicts the power flow exchanged between the resonant modes of different subsystems. In the case of the sound transmission through a thin light structure, it...
Article
Full-text available
Statistical modal Energy distribution Analysis (SmEdA) may be used as alternative to Statistical Energy Analysis for describing subsystems with low modal overlap. In its original form, SmEdA predicts the power flow exchanged between the resonant modes of different subsystems. In the case of the sound transmission trough a thin light structure, it i...
Article
Full-text available
In string musical instruments, the sound is radiated by the soundboard, subject to the strings excitation. This vibration of this rather complex structure is described here with models which need only a small number of parameters. Predictions of the models are compared with results of experiments that have been presented in Ege et al. [Vibroacousti...
Article
Full-text available
Numerical computation of nonlinear normal modes (NNMs) for conservative vibratory systems is addressed, with the aim of deriving accurate reduced-order models up to large amplitudes. A numerical method is developed, based on the center manifold approach for NNMs, which uses an interpretation of the equations as a transport problem, coupled to a per...
Article
Full-text available
The piano soundboard transforms the string vibration into sound and therefore, its vibrations are of primary importance for the sound characteristics of the instrument. An original vibro-acoustical method is presented to isolate the soundboard nonlinearity from that of the exciting device (here: a loudspeaker) and to measure it. The nonlinear part...
Article
Full-text available
An expression of the piano soundboard mechanical mobility (in the direction normal to the soundboard) depending on a small number of parameters and valid up to several kHz is given in this communication. Up to 1.1 kHz, our experimental and numerical investigations confirm previous results showing that the soundboard behaves like a homogeneous plate...
Conference Paper
Full-text available
The MEMS digital loudspeaker consists of a set of acoustic transducers, called speaklets, arranged in a matrix and which operate in a binary manner by emitting short pulses of sound pressure. Using the principle of additivity of pressures in the air, it is possible to reconstruct an audible sound. MEMS technology is particularly well suited to prod...
Conference Paper
Full-text available
Regarding lightweighting structures for aeronautics, automotive or construction applications, the level of performance of solutions proposed in terms of damping and isolation is fundamental. Hence multilayered plate appears as an interesting answer if damping performances are properly optimized. In this paper, a novel modal analysis method (Ege et...
Conference Paper
Full-text available
On the basis of a recently proposed vibro-acoustical model of the piano soundboard (X. Boutillon and K. Ege, Vibroacoustics of the piano soundboard: reduced models, mobility synthesis, and acoustical radiation regime. \emph{submitted to the Journal of Sound and Vibration}, 2011.), we present several models for the coupling between the bridge and th...
Conference Paper
Full-text available
Under the excitation of strings, the wooden structure of string instruments is generally assumed to undergo linear vibrations. As an alternative to the direct measurement of the distortion rate at several vibration levels and frequencies, we characterise weak non-linearities by a signal-model approach based on cascade of Hammerstein models. In this...
Article
Workshop organisé par Bertrand David et Roland Badeau le 13 Décembre 2011 à Télécom ParisTech
Article
Workshop organisé par Bertrand David et Roland Badeau le 13 Décembre 2011 à Télécom ParisTech
Conference Paper
Full-text available
Nos travaux portent sur le calcul numérique de modes non linéaires. L'approche adoptée consiste à résoudre par différences finies l'équation aux dérivées partielles (EDP) décrivant la géométrie d'un mode non linéaire dans l'espace des phases. Cette EDP est vue comme un problème de transport dont on recherche les conditions initiales donnant des sol...
Conference Paper
Full-text available
Up to around 1.1 kHz, the soundboard of the piano behaves like a homogeneous plate whereas upper in frequency, it can be described as a set of waveguides defined by the ribs. In consequence: a) The acoustical coincidence phenomenon is deeply modified in comparison with that occurring in homogeneous plates since the dispersion curve of a waveguide c...
Conference Paper
Full-text available
The vibrations of the soundboard of an upright piano in playing condition are investigated. It is first shown that the linear part of the response is at least 50 dB above its nonlinear component at normal levels of vibration. Given this essentially linear response, a modal identification is performed in the mid-frequency domain [300-2500] Hz by mea...
Conference Paper
Full-text available
An expression of the piano soundboard mechanical mobility (in the direction normal to the soundboard) depending on a small number of parameters and valid up to several kHz is given in this communication. Up to 1.1 kHz, our experimental and numerical investigations confirm previous results showing that the soundboard behaves like a ho-mogeneous plat...