10.14489/td.2023.02.pp.013-021

2023, 02 February

DOI: 10.14489/td.2023.02.pp.013-021

Danilov V. N., Ushakov V. M., Evtushenko S. G.
ON SOME FEATURES OF THE SIGNAL SPECTRA IN THE ULTRASONIC STUDY OF THE METAL STRUCTURE WITH INCREASED ATTENUATION OF LONGITUDINAL WAVES
(pp. 13-21)

Abstract. By the method of computer modeling, some features of the change in the frequency spectra of the bottom signals of direct high-frequency probes during ultrasonic investigation of the metal structure with different average grain sizes and the dispersion of their sizes have been established. It is shown that for probe models with frequencies f0 = 10; 15 MHz (with a frequency spectrum width at 0.25 from a maximum of 0.5f0), with an increase in the values of the average grain size and the dispersion of their sizes, an increase in the width of the signal spectra occurs due to the peculiarities of changing the shape of the spectra in the low frequency region. For a broadband converter model with a frequency f0 = 15 MHz (with a spectrum bandwidth ≈ f0), under similar conditions, the spectrum width decreases due to the predominant attenuation of its high-frequency components, while for all converter models used in calculations, there is a decrease in the frequency of the spectrum maximum. The calculation results for the broadband converter are confirmed by experiment. It is proposed to use the shift of the maximum of the spectrum and the change in the bandwidth of the pulse spectrum in the ultrasonic study of the metal structure.

Keywords: probe, bottom signal, spectrum width, average grain size, dispersion, pulse, metal, longitudinal wave.

+ - About the Authors Click to collapse

V. N. Danilov, V. M. Ushakov, S. G. Evtushenko (JSC “RPA “CNIITMASH”, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Danilov V. N., Ushakov V. M (2021). Research of structure of samples of metal of power pipelines by ultrasonic method. Kontrol'. Diagnostika, Vol. 24, (6), pp. 4 – 14. [in Russian language] DOI: 10.14489/td.2021.06.pp.004-014
2. Ushakov V. M., Danilov V. N. (2022). Investigation of metal structure by non-destructive ultrasonic method. Kontrol'. Diagnostika, Vol. 25, (7), pp. 4 – 13. [in Russian language] DOI: 10.14489/td.2022.07.pp.004-013
3. Danilov V. N., Ushakov V. M., Rymkevich A. I. (2021). Investigation of the possibilities of assessing the state of the metal structure of pipelines in operation by the ultrasonic method. Defektoskopiya, (8), pp. 3 – 13. [in Russian language]
4. Danilov V. N. (2006). The program for computer simulation of the operation of electroacoustic paths of flaw detectors "Impulse +". Defektoskopiya, (3), pp. 37 – 43. [in Russian language]
5. Danilov V. N., Izofatova N. Yu., Voronkov V. A. (1997). Comparison of theoretical and experimental results of the study of the operation of direct combined converters. Defektoskopiya, (6), pp. 39 – 49. [in Russian language]
6. Ermolov I. N., Lange Yu. V. (2006). Ultrasonic control. Non-destructive testing: handbook: in 8 volumes. Vol. 3. 2nd ed. Moscow: Mashinostroenie. [in Russian language]
7. Danilov V. N. (2022). About influence of thickness of a layer of a contact liquid on amplitude echo signal the normal probe with different number of reflections from a bottom surface. Kontrol'. Diagnostika, Vol. 25, (1), pp. 4 – 15. [in Russian language] DOI: 10.14489/td.2022.01.pp.004-015
8. Danilov V. N. К (1989). On the calculation of the damping coefficient of elastic waves during scattering in polycrystalline media. Defektoskopiya, (8), pp. 18 – 23. [in Russian language]
9. Ermolov I. N. (1992). Ultrasonic control: a quick handbook. Moscow: NPO TsNIITMASh. [in Russian language]

+ - Purchase digital version of a single article Click to collapse

This article is available in electronic format (PDF).

The cost of a single article is 500 rubles. (including VAT 20%). After you place an order within a few days, you will receive following documents to your specified e-mail: account on payment and receipt to pay in the bank.

After depositing your payment on our bank account we send you file of the article by e-mail.

To order articles please copy the article doi:

10.14489/td.2023.02.pp.013-021

and fill out the form