단일보드컴퓨터를 이용한 모형 구조물 가속도 계측 유효성 검증
Validation of Acceleration Measurement of Model Structure Using SBC
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초록
본 논문은 범용성 기기를 기반으로한 가속도계로 라즈베리파이 4B 기반 MEMS형 가속도계 ADXL345와 iPhone 12 pro 내 장형 가속도계를 사용하여 다자유도 축소 모형 구조물의 응답을 계측하고 그 결과를 IEPE타입 가속도계와 비교하여 계측 유효성을 확 인하고자 하였다 . 1~3층 모형 구조물 최상층에 충격해머로 가진하였으며 각 층의 가속도를 측정하였다 . 시간영역에서 모든 가속도계 의 계측값이 대체적으로 유사한 결과를 나타냈으며 진동수영역에서 모드진동수 또한 유사하게 나타났다 . 감쇠비와 모드형상 추정에 있어서 라즈베리파이 기반 ADXL345보다 iPhone 12 pro가 더 정확한 결과를 보였으나 대체적으로 유사하게 나타났다 . 실험 결과를 바 탕으로 라즈베리파이 기반 ADXL345와 iPhone 12 pro 가속도계의 구조물 식별 유효성을 확인하였다 .
Abstract
In this paper, the response of a MDOF small model structure was measured using an accelerometer based on a universal purpose device, and the results were compared with an IEPE-type accelerometer to verify the measurement effectiveness. The top floor of the 1~3 story model structure was excited with an impact hammer, and the acceleration of each floor was measured. In the time domain, the measured values of all accelerometers showed generally similar results, and in the frequency domain, the mode frequencies were also similar. In estimation of damping ratio and mode shape, iPhone 12 pro showed more accurate results than Raspberry Pi- based ADXL345, but it was generally similar. Based on the experimental results, the validity of the system identification of the Raspberry Pi-based ADXL345 and the iPhone 12 pro accelerometer was confirmed.
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