SU588495A1 - Ultrasonic method of determining sound attenuation in material specimens - Google Patents
Ultrasonic method of determining sound attenuation in material specimensInfo
- Publication number
- SU588495A1 SU588495A1 SU742033393A SU2033393A SU588495A1 SU 588495 A1 SU588495 A1 SU 588495A1 SU 742033393 A SU742033393 A SU 742033393A SU 2033393 A SU2033393 A SU 2033393A SU 588495 A1 SU588495 A1 SU 588495A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- attenuation
- wave
- determining
- sample
- sound
- Prior art date
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
Изобретение Относитс к области неразрушающего контрол и может быть использовано дл определени затухани акустических волн в образцах различных материалов.The invention Refers to the field of non-destructive testing and can be used to determine the attenuation of acoustic waves in samples of various materials.
Известен способ определени качества материалов по затуханию ультразвука, заключающийс в том, что в изделии с помощью преобразовател возбуждают ультразвуковые колебани , измер ют резонансную частоту издели , которую используют дл расчета коэффициента затухани . Недостатками этого способа вл етс низка точность измерени за счет дифракционных эффектов и узка область использовани 1.A known method for determining the quality of materials from the attenuation of ultrasound is that the product excites ultrasonic vibrations with a transducer, measures the resonant frequency of the product, which is used to calculate the attenuation coefficient. The disadvantages of this method are low measurement accuracy due to diffraction effects and a narrow field of use 1.
Известен также ультразвзковой способ определени затухани в образцах материалов, заключающийс в том, что образец помещают в звуковое поле, измер ют амплитуду звуковой волны, отраженной от него, определ ют коэффициент отражени волны и по нему суд т о затухании 2.An ultrasound method for determining the attenuation in samples of materials is also known, which consists in placing the sample in a sound field, measuring the amplitude of the sound wave reflected from it, determining the reflection coefficient of the wave, and judging it from the attenuation 2.
Однако известный способ не обеспечивает высокой точности измерени , поскольку используемые в процессе измерени звукопоглотители в широком диапазоне частот не обеспечивают режима свободного пол .However, the known method does not provide high accuracy of measurement, since the absorbers used in the measurement process in a wide frequency range do not provide a free field mode.
Дл повышени точности измерени -предлагаемым способом снабжают контролируемый образец акустически жесткой нагрузкой и измер ют коэффициенты отражени звуковой волны сначала при плотном прижатии нагрузки к контролируемому образцу, а затем при рассто нии одной четверти звуковой волны , а коэффициеит затухани определ ют по формуле;To improve the measurement accuracy, the proposed method is used to supply the controlled sample with an acoustically rigid load, and the reflection coefficients of the sound wave are first measured tightly against the test specimen, and then at a distance of one quarter of the sound wave, and the attenuation coefficient is determined by the formula;
I (ХХ 2кз)I (XX 2kz)
(Zxx+ К2хх-2кз) (Zxx + К2хх-2кз)
гдеWhere
I - 3„I - 3 „
у at
- -
1 + ркз1 + rkz
1one
Р, Рхх и РКЗ - коэффициенты отрал епи без нагрузки, при плотном прижатии акустически жесткой нагрузки и при рассто нии одной четверти волны соответственно.P, Pxx and RKZ are the coefficients of the otpi epi without load, with a tight pressing of the acoustically rigid load and with a distance of one quarter of the wave, respectively.
На чертенке представлено устройство, реализзющее описываемый способ.The imp is a device that implements the described method.
В измерительной трубе 1 расположен гидрофон 2 и испытываемый образец 3. Массивный сигнальный цилиндр 4 используетс дл создани акустически жесткой нагрузки.The hydrophone 2 and the test sample 3 are located in the measuring tube 1. A massive signal cylinder 4 is used to create an acoustically rigid load.
Согласно данному способу, с помощью гидрофона 2 измер ют амплитуду волны, отраженной от испытываемого образца 3, по величине которой определ ют коэффициент отражени . Определение коэффициентов отражени звзасовой волны производитс в трех режимах нагрузки испытываемого образца:According to this method, the hydrophone 2 measures the amplitude of the wave reflected from test sample 3, the magnitude of which determines the reflection coefficient. The determination of the reflection coefficient of the zvzas wave is carried out in three load modes of the test sample:
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU742033393A SU588495A1 (en) | 1974-06-05 | 1974-06-05 | Ultrasonic method of determining sound attenuation in material specimens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU742033393A SU588495A1 (en) | 1974-06-05 | 1974-06-05 | Ultrasonic method of determining sound attenuation in material specimens |
Publications (1)
Publication Number | Publication Date |
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SU588495A1 true SU588495A1 (en) | 1978-01-15 |
Family
ID=20587566
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU742033393A SU588495A1 (en) | 1974-06-05 | 1974-06-05 | Ultrasonic method of determining sound attenuation in material specimens |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU588495A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103926324A (en) * | 2014-04-08 | 2014-07-16 | 国家电网公司 | Method for detecting creep damage of main steam pipeline through ultrasonic surface waves |
-
1974
- 1974-06-05 SU SU742033393A patent/SU588495A1/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103926324A (en) * | 2014-04-08 | 2014-07-16 | 国家电网公司 | Method for detecting creep damage of main steam pipeline through ultrasonic surface waves |
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