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김치엽(Chi-Yeop Kim),권일범(Il-Bum Kwon),최만용(Man-Yong Choi) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The wireless measurement device was instrumented to measure the stress distribution of structures. This<br/> device was composed of the data recorder, transmitter and receiver with PC interface. The specification of this<br/> device was as follows: Analog inputs of 8 channels, 400 MHz transmitted frequency, and the transmitted<br/> power of 5 mW. This device was manufactured as the sending and receiving system of long-term strains to<br/> calculate the stress distribution. The 4 channel strains of 150 Hz were well transmitted by this device. Also,<br/> these strain data was able to show the stress distribution of the experimental specimen. Futhermore, the data<br/> quantity was equal to the data quantity during three months at 1 hour sampling time.
김치엽 ( Kim Chi-yeop ),권일범 ( Kwon Il-bum ),최만용 ( Choi Man-yong ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
The remote wireless measurement device was constructed to apply to the monitoring of the structural health status. The device was composed of the transmitter and receiver. The specification of this device was as follows: 900MHz of transmitted frequency, 8 channels, 50 kbps of the transmitted speed, and 5mW of the transmitted power. The strain transmition test was performed to verify the performance of this device. This device was well operated to transmite the 150 Hz strain, even though shown to transmit the 10 Hz strain in this paper.
김치엽 ( Kim¸ Chi-yeop ),권일범 ( Kwon¸ Il-bum ),최만용 ( Choi¸ Man-yong ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
The remote wireless measurement device was instrumented to measure the stress distribution of structures. This device was composed of the data recorder, transmitter and receiver with PC interface. The specification of this device was as follows: Analog inputs of 8 channels, 400 MHz transmitted frequency, and the transmitted power of 5 mW. This device was manufactured as the sending and receiving system of long-term strains to calculate the stress distribution. The 4 channel strains of 150 Hz was well transmitted by this device. Also, these strain data was able to show the stress distribution of the experimental specimen. Futhermore, the data quantity was equal to the data quantity during three months at 1 hour sampling time.
최만용 ( Choi Man-yong ),김치엽 ( Kim Chi-yeop ),권일범 ( Kwon Il-bum ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
The strain pattern was investigated to develop the techniques for monitoring the health status of the steel truss bridge which was scaled down to 1/15 of the real bridge for the laboratory experiments. The damage scenarios were chosen as 8 cases which was included the sound bridge. The strain measured from the bridge showed the complex shape which has the two or more dynamic vibration modes. When the load vehicle was passed the center of the bridge, the strain pattern was picked at that time. The various damage cases were distinguished from each other by the strain patterns.
권일범 ( Kwon Ii-bum ),김치엽 ( Kim Chi-yeop ),최만용 ( Choi Man-yong ),임종묵 ( Lim Jong-mook ),김인걸 ( Kim In-gul ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
PVDF film sensor was applied to measure the stress concentration for monitoring the structur The strain calibration of this film sensor was performed by aluminum beam test. The PVDF se the electrical strain gage were bonded on the beam. When the beam was loaded, the output of strain gage was compared with the output of the PVDF sensor. The waveform of PVDF sensor outpu shown as the same form of the output of electrical strain gage. The gain was determined comparing these two signals to determine the exact value of the strain. The tensile test of specimens was conducted to develop the measurement technique of stress concentration. The outp ratio between the PVDF sensor near the notch and the PVDF sensor far from the notch could g information about the load bearing capacity of steel specimen.
권일범 ( Kwon Il-bum ),김치엽 ( Kim Chi-yeop ),최만용 ( Choi Man-yong ),백세종 ( Paik Se-jong ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
Light losses in optical fibers are investigated by a commercial mini-OTDR (Optical Time Domain Reflectometry) to develop fiber optic probes for structural strain measurement. The sensing fibers are manufactured 4 kinds of fibers: one is single mode fiber, and second is multimode fiber, and the third is low-cladding-index fiber, and the forth is the high-core-index fiber. Fiber bending tests are performed to determine the strain sensitivity according to the strain of gage length of optical fibers. In the result of this experiment, the strain sensitivity of the high-core-index fiber was shown the highist value than others. Therefore, the fiber optic strain probe of the OTDR sensor could be easily made by the high-core-index fiber.