Measuring longitudinal wave speed in aluminum bar

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F08%3APU80095" target="_blank" >RIV/00216305:26110/08:PU80095 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

čeština

Original language name

Measuring longitudinal wave speed in aluminum bar

Original language description

In this article there is described a method for measuring longitudinal wave speed in aluminum bar using ordinary computer with a microphone attached. Axial impact on one end of a bar created standing wave whose sound was detected by microphone. Softwarerecorded signal and calculated spectrum using FFT routine, found position of highest peak and displayed a graph for manual measurement of peak width for error estimation. The bar was balancing on tip of needle supporting the bar at its midpoint. That iswhy only odd harmonics were found in the spectrum. The velocity of sound together with known density of the material can be used for calculating Young s modulus of tension. Both mechanical properties, speed of sound and Young s modulus have been found very close to correct value

Czech name

Measuring longitudinal wave speed in aluminum bar

Czech description

In this article there is described a method for measuring longitudinal wave speed in aluminum bar using ordinary computer with a microphone attached. Axial impact on one end of a bar created standing wave whose sound was detected by microphone. Softwarerecorded signal and calculated spectrum using FFT routine, found position of highest peak and displayed a graph for manual measurement of peak width for error estimation. The bar was balancing on tip of needle supporting the bar at its midpoint. That iswhy only odd harmonics were found in the spectrum. The velocity of sound together with known density of the material can be used for calculating Young s modulus of tension. Both mechanical properties, speed of sound and Young s modulus have been found very close to correct value

Type

D - Article in proceedings

CEP classification

AM - Pedagogy and education

OECD FORD branch

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Project

<a href="/en/project/GA103%2F06%2F1711" target="_blank" >GA103/06/1711: Defectoscopy of reinforced concrete elements and structures using non-linear acoustic spectroscopy</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2008

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

VÝSKUMNÉ A EDUKAČNÉ AKTIVITY NA KATEDRÁCH FYZIKY TECHNICKÝCH UNIVERZÍT

ISBN

978-80-227-2887-4

ISSN

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e-ISSN

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Number of pages

5

Pages from-to

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Publisher name

Jozef Leja, Marcela Chovancová: Technická universita

Place of publication

Bratislava

Event location

Bratislava

Event date

Jun 3, 2008

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

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