WP2: Damped Composites Modelling

The main objective of this work package is to investigate, upgrade and propose new models for linear and non linear vibration of damped (viscoelastic) sandwich and multilayered composite structures.

NONLINEAR VIBRATIONS ANALYSIS OF VISCOELASTICALLY DAMPED by Daya and Belouettar by Salim Belouettar — last modified 2006-10-17 10:38

The presented approach permits to reduce the Non linear vibrations problem of viscoelastic structures to an amplitude equation whose coefficients are obtained by solving - 1 Linear eigenvalue problem - 2 Classical linear problems By this way, one obtains Frequency-amplitude and loss factor-amplitude relationships. - Under development : Sandwich structures (Ring, Arch, Cylinder… ) - Future investigation: non linear vibration of piezoelectric sandwich structures

FINITE ELEMENT FREQUENCY-DEPENDENT DYNAMIC ANALYSIS OF VISCOELASTIC COMPOSITE STRUCTURES. by Evegny BARKANOV by Salim Belouettar — last modified 2006-10-17 10:38

Approaches developed present universal tools and give the possibility to model and analyse viscoelastic composite structures by the finite element method using the same viscoelastic damping model in the free vibration, frequency and time domain analyses.

Shell finite element and Numerical Algorithm by Boudaoud, Belouettar and Daya by Salim Belouettar — last modified 2006-10-17 10:38

 

Samrt05 by Salim Belouettar — last modified 2006-10-17 10:38

presentaion given by salim Belouettar. (Henri Tudor). Title of the presentation: An amplitude equation for the non-linear vibration of sandwich piezoelectric beams submitted to active control

Analytical and numerical modal properties of sandwich viscoelastic and piezoelectric beams submitted to active control by Boudaoud, Belouettar and Daya by Salim Belouettar — last modified 2006-10-17 10:38

An analytical modal approach similar to the work done by L. Duigou et al. (2003) in the case of a piezoelectric /elastic/ piezoelectric sandwich

Shell finite element and Numerical Algorithm for vibrations of viscoelastic structures by CRPHT and Um-LPMM by Salim Belouettar — last modified 2006-10-17 10:38

 

XV colloque vibrations chocs & bruits 2006 - Lyon (CRPHT, UM-LPMM) by Salim Belouettar — last modified 2006-10-17 10:38

Technique numérique pour l’analyse modale de sandwich 5 couches à amortissement hybride actif /passif

FINITE ELEMENT FREQUENCY-DEPENDENT by Evegny Barkanov by Salim Belouettar — last modified 2006-10-17 10:38

Dynamic characteristics of viscoelastic composite structures are evaluated by the energy method, the method of complex eigenvalues and using the resonant peaks of the frequency response function, and the steady state vibrations.

EADS CCR involvement in WP2 by patricia Saad by Salim Belouettar — last modified 2006-10-17 10:38

 

Task 2.3: MODELS VALIDATION by Evegny Barkanov by Salim Belouettar — last modified 2006-10-17 10:39

Eigenfrequencies obtained by the energy method are always lower then corresponding eigenfrequencies obtained by the method of complex eigenvalues, but loss factors are always higher. Eigenfrequencies obtained from the frequency response analysis are equal or higher then corresponding eigenfrequencies obtained by the complex eigenvalues method in most cases, but loss factors are always equal or lower. It is necessary to note that very good coincidence is observed always only for the eigenfrequencies. Loss factors determined for a particular mode with resonant peaks at frequencies located far-away from each other, like in Figure, are considerably lower then obtained in the method of complex eigenvalues. Dynamic characteristics obtained by the complex eigenvalues method are located always between the corresponding dynamic characteristics obtained by the energy method and frequency response analysis.