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김병극 ( Byoung-geuk Kim ),김영주 ( Young-joo Kim ),윤동진 ( D. J. Yoon ),이승석 ( S. S. Lee ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
Nondestructive testing by using surface hardness method, ultrasonic pulse-velocity method and impact-echo resonant method was performed for the estimation of compressive strength of and the detection of flaws in concrete structures. A wide band displacement, and a wide band velocity sensor and a portable impact-echo testing equipment were developed. Those had quite good characteristics and performance for testing concrete. Relatively resonable testing method for estimating compressive strength was surface hardness method even though the results have large error of about 20 %. The other methods for measuring compressive strength was applicable only in the range lower than about 250 kg/cm<sup>2</sup>. The flaws and cracks in concrete structure were well detected and those sizes and locations were well evaluated by impect-echo test.
尹東珍,金鐵中 韓國非破壞檢査學會 1987 한국비파괴검사학회지 Vol.6 No.2
Leak detection testing for the pipeline system was performed by the acoustic emission method. It was found that the detected signal spectrum was influenced by the frequency response of sensors and pressure changes. AE parameters and frequency spectrum distributions were used to analyze the leak signals. The slope rise time of AE parameters were the important factors for distinguishing leak signals. The amplitude of leak signal was more affected by the changes of leak rate and pressure than those of leak type.
김영환,권오양,윤동진 한국비파괴검사학회 1991 한국비파괴검사학회지 Vol.11 No.2
A Wireless acoustic emission (AE) system has been developed for continuous monitoring of rotating structures such as turbine rotors. The cable between preamplifier and signal processing unit of a conventional AE system was replaced by the frequency modulated telemetry. The detected signals were modulated and transmitted as an RF signals by the transmitting module, then received and demodulated by the receiving module. The distance between the transmitting and the receiving antennas could be separated up to 10cm within a reasonable signal-to-noise ratio. The simulated AE signals generated by pencil lead breaks from rotating structures sere successfully detected using the developed wireless AE monitoring system.
실린더형 용기에서의 신호전파경로 비교를 이용한 음향방출 위치표정
권오양,김영환,윤동진 한국비파괴검사학회 1990 한국비파괴검사학회지 Vol.10 No.1
By discriminating the wave propagation paths in cylindrical vessels, a technique for AE source location has been proposed. This method is based on the path difference between several propagating directions from a source to a sensor. One sensor can receive multiple waveforms sequentially including a direct arrival and several others propagated through the circumferential direction. AE wave front normally propagates in all directions and as many waveforms can reach the sensor until the signal faded out by attenuation. Only the first four arrivals suffice the condition for calculating the source location. The proposed method was examined for an actual cylindrical vessel by the source location experiment using simulated AE sources. The test showed very promising results and the method can be utilized for a simple AE source location without multi-channel instruments.