10.14489/td.2017.03.pp.004-010

2017, 03 March

DOI: 10.14489/td.2017.03.pp.004-010

Murashov V. V.
RESEARCH OF CHARACTERISTICS OF THE ACOUSTIC FREE VIBRATION METHOD
(pp. 4-10)

Abstract. The article deals with the theoretical bases of local option of acoustic method of free vibration at detection of defects like of discontinuity in details and the constructions executed from different metal and non-metallic materials. It is specified that the method of free vibration in comparison with the other low-frequency acoustic methods of non-destructive testing (mechanical impedance analysis, velocimetric, acoustic-topographic, etc.) has some advantages: treat possibility of control of constructions from materials with small elastic modules and with high attenuation coefficients of elastic oscillations (for example, polyfoam, rubber) and also possibility of detection of defects at big depths. It is shown that diameter of defect (or its area) at control of details and constructions can be found by its contouring on change of signal amplitude in certain frequency range, and the depth of defect can be evaluated on amplitude and frequency of spectrum components. It is established that sensitivity at control by method of free vibration decreases with increase in depth of revealed defect.

Keywords: acoustic free vibration method, non-metallic materials, attenuation coefficient, elastic vibrations, testing sensitivity.

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V. V. Murashov (Federal State Unitary Enterprise “All-Russian Scientific Research Institute of Aviation Materials” State Research Center of Russian Federation, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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