SU659947A1 - Device for registering crack formation processes by acoustic emission technique - Google Patents
Device for registering crack formation processes by acoustic emission techniqueInfo
- Publication number
- SU659947A1 SU659947A1 SU752096348A SU2096348A SU659947A1 SU 659947 A1 SU659947 A1 SU 659947A1 SU 752096348 A SU752096348 A SU 752096348A SU 2096348 A SU2096348 A SU 2096348A SU 659947 A1 SU659947 A1 SU 659947A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- registering
- acoustic emission
- crack formation
- formation processes
- emission technique
- Prior art date
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
3 аналог-код и амплитудный дискриминатор 6. Преобразователь 3 переводит один из параметров или группу параметров импульса (амплитуду, длительность, среднюю энергию, среднюю мощность, длительность переднего фронта и т. д.) в цифровой код, который запоминаетс в блоке 4 пам ти. Амплитудный дискриминатор 6 формирует нормализованный импульс в случае превышени по амплитуде входного сигнала заранее установленного уровн , соответствующего по влению трещины минимальной величины. Импульсы с выхода амплитудного дискриминатора 6 подсчитываютс счетчиком 7. Счетчик 9 фиксирует число циклов нагружени . По достижении определенного числа в счетчике 7, т. е. по истечении нескольких циклов нагружени каскадом сравнени 8 осуществл етс сравнение показаний счетчиков 7 и 9. При равенстве или малом различии показаний формируетс управл ющий сигнал, по которому информаци из блока 4 пам ти передаетс на индикатор 5, после чего одновременно показани обоих счетчиков сбрасываютс . В случае значительных расхождений в показани х счетчиков 7 и 9, что может быть вызвано отсутствием полезного сигнала или по влением его в моменты регистрации случайных шумовых акустических сигналов, каскадом 8 сравнени формируетс импульс , который стирает информацию в блоке 4 пам ти.3 analogue code and amplitude discriminator 6. Converter 3 converts one of the parameters or a group of pulse parameters (amplitude, duration, average energy, average power, leading edge duration, etc.) into a digital code that is stored in memory block 4 . The amplitude discriminator 6 generates a normalized pulse in case of an amplitude of the input signal exceeding a predetermined level corresponding to the appearance of a minimum crack. The pulses from the output of the amplitude discriminator 6 are counted by the counter 7. The counter 9 records the number of loading cycles. When a certain number is reached in counter 7, i.e., after several loading cycles have expired, comparison of the readings of counters 7 and 9 is performed. If the readings are equal or small, a control signal is generated by which information from memory block 4 is transmitted to indicator 5, after which simultaneously the readings of both counters are reset. In the event of significant discrepancies in the readings of counters 7 and 9, which may be caused by the absence of a useful signal or the occurrence of it at the time of recording random noise acoustic signals, a pulse is formed by the comparison stage 8, which erases the information in memory block 4.
Описываемое изобретение позвол ет сThe described invention allows
высокой достоверностью регистрироватьhigh confidence record
усталостную развивающуюс трещину иfatigue developing crack and
устран ют искажени информации из-заeliminate information distortions due to
акустических помех.acoustic interference.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU752096348A SU659947A1 (en) | 1975-01-16 | 1975-01-16 | Device for registering crack formation processes by acoustic emission technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU752096348A SU659947A1 (en) | 1975-01-16 | 1975-01-16 | Device for registering crack formation processes by acoustic emission technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU659947A1 true SU659947A1 (en) | 1979-04-30 |
Family
ID=20607356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU752096348A SU659947A1 (en) | 1975-01-16 | 1975-01-16 | Device for registering crack formation processes by acoustic emission technique |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU659947A1 (en) |
-
1975
- 1975-01-16 SU SU752096348A patent/SU659947A1/en active
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