THE LENGTH OF FLEXIBLE COILED TUBES BY OBSERVING THE SOUND PROPAGATION TIME

Iulian LUPEA

Abstract


A procedure to assess the length of coiled tubes by using the time of sound propagation along the tube, is presented. At one end of the tube a sine wave is generate using a speaker. The sine wave is recorded at both tube ends by using two microphones connected to the input channels of the acquisition system, in order to evaluate the time delay between the two waves. The acquisition system and the calculation of the tube length are managed by a Labview application. The sound speed in the tube is observed in function of the frequency and the tube diameter.


Full Text:

PDF

References


Bădărău, E., Introducere în acustică, Editura Academiei RPR, 1953.

Coroian, A., Lupea, I., Improving level for a

simplified passenger cabin by using modal participation and size optimization, Romanian Journal of Acoustics & Vibration 10 (1), 2013.

Lupea, I., Considerations on the Helmholtz

resonator simulation and experiment, Proceedings of the Romanian Academy, Series A-Mathematics Physics Technical Sciences Information Science Volume: 13 Issue: 2, pages: 118-124, Published: Apr-Jun, 2012.

Lupea, I., Experimental validation of acoustic modes for fluid structure coupling in the car habitacle, Proceedings of the Romanian Academy, Series A-Mathematics Physics Technical Sciences Information Science, Vol:18, Issue: 1, 2017.

Lupea, I., Vibration and noise measurement

by using Labview programming, Casa Cărţii de Ştiinţă, Cluj-Napoca, 2005.

Lupea, I., The length of flexible coiled tubes measured by using standing waves, Acta Technica Napocensis, Series: AMM, Issue III, Vol. 61, 2018.

Lupea, I., The length of flexible coiled tubes measured by using a sound card and the FRF, Acta Technica Napocensis, Series: AMM, Issue III, Vol. 62, 2019.

** ni.com, Labview, National Instruments Sound vibration measurement suite, 2018.


Refbacks

  • There are currently no refbacks.


JOURNAL INDEXED IN :