Koštial, Pavol

Suchá, Daniela

Vavro, Ján

Vavro, Ján, jr.

Vavrová, Alena

English

DSpace at VSB Technical University of Ostrava

Sbomfk vědeckých praci Vysoké školy báňské - Technkké 1l .. � O:ir::.číslo 3, rok 2009, ročník Lil, řada hutnická, článek č. 1565 Dana SUCHÁ1 , Alena VAVROVÁ 1 , Ján VAVRO1 jr.,Ján VAVRO1 , Pavel KOŠTIAL2 < THE COMPARlSON OF NATURAL'S FREQUENCY OF SOME MATERlALS BY THE HELP MODAL ANAL YSIS_ POROVNANIE VLASTNÝCH FREKVENCIÍ VYBRANÝCH MATERlÁLOV POMOCOU MODÁLNEJ ANALÝZY Alexander Dubček University o/ Trenčín, Fac u/ty o/ Jndustria/ Technologies, Púchov VŠB - Technica/ Unil'ersity o/ Ostrava, Faculty o/ Metallurgy and Materia/s Engineering, OstravaAbstract Each object has its own resonant frequency. To the non problematic use of materials and equipment, it is necessary to accurately determine these frequencies. It is hard to imagine in today's multi · materials age epoch gel by only úsing metal materials, however they are still important part of our daily life. ln this article we identify own frequencies not only metal, but non-metallic materials too, namely the laminates and ceramic materials. ln this case we use some special methods, we will deal with tests by the modal hammer with syslem PULSE. ln this work are compared experimental own frequencies with numerical values for these materials. The numerical values we were calculated by the help software COSMOS M. Abstrakt Každý predmet má vlastnú rezonančnú frekvenciu. Pre bezproblémové používanie materiálov a zariadení je dóležité presne určit' tieto frekvencie. V dnešnej multi-materiálovej dobe sa však už nezaobídeme len z použitím kovových materiálov, aj keď tieto stále zostávajú dóležitou súčasťou nášho každodenného života. V tomto článku sa zaoberáme identifikáciou vlastných frekvencií kovových aj nekovových materiálov, konkrétne ide o lamináty a keramické materiály. Na toto je určených niekol'ko špeciálnych metód, budeme sa zaoberať jednou z nich, testy modálnym kladivkom so systémom PULSE. V práci sú porovnané vlastné frekvencie pre jednotlivé materiály, určené teoretickým aj experimentálnym prístupom. Numerické hodnoty boli vypočítané pomocou softweru COSMOS M. Key words: resonant frequency, laminates, ceramic materials 1. IntroductionThere are two general cases-free oscillations and forced. The free oscillations as in the casethat the oscillation under the action of forces that causes the system itself, in the absence of extemal forces. System under the action of free vibrations will oscillate in one or more of their frequencies, which is characteristic of a dynamic system of fixed mass and stiffness. Oscillations which are excited by using extemal forces called forced oscillations. lf the vibrations give rise system that is forced to oscillate in the driving frequencies. [7] lnvestigation of their frequencies is of importance particularly when assessing the conduct of the modeling object. These are mainly the fact that a significant frequency of excitation and the frequency of their own were the same, respectively. were sufficiently far apart. Otherwise, there is excited own oscillations, which is characterized by the so-called. resonant phenomenon, which is unacceptable in practice. [6] When the excitation frequency coincides with any of the frequencies of its own system to meet the conditions of resonance which leads to dangerous fluctuations. Then calculate their frequencies have a great importance in the study of vibrations. [8] 223 

Porovnanie vlastných frekvencií vybraných materiálov pomocou modálnej analýzy

http://dspace.vsb.cz/bitstream/10084/78157/2/VSB%20HUF%202009-3_43_Sucha.pdf

Porovnanie vlastných frekvencií vybraných materiálov pomocou modálnej analýzy

Abstract

Similar works

Full text

Available Versions

DSpace at VSB Technical University of Ostrava