National Repository of Grey Literature 231 records found  beginprevious222 - 231  jump to record: Search took 0.00 seconds. 
The contribution to modal analysis of light structures with correction to additional transducer mass
Pešek, Luděk ; Veselý, Jan
This contribution deals with the correction of measured FRF's to additional mass represented by moving mass of transducer which makes identification of eigencharacteristics more accurate. The correction is aimed at the change of eigenfrequencies by me
Accoustic ananlysis of finite element models of supraglottal tract considering cleft palate
Dedouch, K. ; Horáček, Jaromír ; Vampola, T. ; Vohradník, M.
FE models of supraglottal tract for vowels /A/ and /I/ are analyzed considering the cleft palate. The modal analysis for the vowel /a/ indicate, that the formant frequencies F1 and F2 are influenced by the size of the cleft only slightly. The results
Frequency response functions modelling of the human skull with simulation of brain tissue influence
Pešek, Luděk ; Horáček, Jaromír ; Hendrych, Pavel
The frequency dependent transfer functions between various anatomically important points on the skull are modelled using the previously developed finite element (FE) models of the human skull. The influence of the brain tissue is taken into account and the results are compared with the original data obtained by the experimental modal analysis where the effects of soft tissues were simulated by an especially prepared gel.
Interaction between human supraglottal space and flexible structural boundary
Dedouch, K. ; Horáček, Jaromír ; Vampola, T. ; Vohradník, M.
A finite element model of the male supraglottal vocal tract is investigated. Modal analysis is focused on the investigation of interaction of the supraglottal acoustic space with flexible part of the vocal tract represented by the bone of hard palate and cartilage in the larynx.
A note to the influence of absorptive areas on dynamic characteristics of cylindrical acoustic space
Dedouch, K. ; Horáček, Jaromír ; Vampola, T.
The subject of the paper is numerical FE modal analysis of cylindrical acoustic space. The absorptive areas are taken into account on the part of the boundary of the acoustic space. The influence of wall impedance on the natural frequencies, damping and modes of vibration of acoustic space is studied.
Modeling of the response of harmonically excited supraglottal
Dedouch, K. ; Horáček, Jaromír ; Vampola, T.
The goal of the paper is harmonic analysis of supraglottal acoustic space modelled by two FE models. The finite element models represent the male vocal tract in between the vocal folds and the lips. A small flexible plate vibrating in the plane of the vocal folds excites the first FE model. The second FE model is excited by the harmonic acoustic pressure applied in a small circular hole situated in the plane of vocal folds. The excited acoustic field in supraglottal space corresponding to the first FE model is identical with the acoustic modes relevant to the acoustic space with closed - open ends, i.e., to the first two formants.
Modeling dynamic behaviour of tram wheels by the finite element method
Podruh, J. ; Pešek, Luděk
Investigation of raylway tram wheel vibration. The rim of wheel is separated by a rubber layer from the disk.
Dynamic analysis of the human supraglottal space considering acoustic-structural interaction
Dedouch, K. ; Horáček, Jaromír ; Veselý, Jan ; Vampola, T. ; Svec, J. G.
A simplified finite element) model of the human vocal tract is presented and its fundamental vibroacoustic characteristics are analysed. Solid-fluid interaction and acoustic wall impedance are taken into account on some parts of the boundaries of the acoustic space.
Modal analysis of rubber-damped wheel with and without the damper for SGP Graz
Pešek, Luděk ; Veselý, Jan ; Vaněk, František ; Cibulka, Jan
The aim of this work was to identify experimental eigenfrequencies, eigenmodes and loss factors for rubber-damped railway wheels with and without acoustic damper for SGP Graz. The excitation was realized by an elektrodynamic vibrator with different levels of excitation. The wheel was hung on the flexible rope. The frequency range was up to 6400Hz.

National Repository of Grey Literature : 231 records found   beginprevious222 - 231  jump to record:
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