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A Study on the Applicability of Smart-phone Accelerometer for the Measurement of Dynamic Behavior in Bridges

교량의 동적 거동 계측을 위한 스마트폰 가속도센서의 적용성에 관한 연구

  • Lee, Hyeong-Jin (Dept. of Civil Engineering, Changwon National University)
  • 이형진 (창원대학교 토목공학과)
  • Received : 2020.07.07
  • Accepted : 2020.08.17
  • Published : 2020.10.31

Abstract

In recent years, measurement in a smart-phone environment is attracting attention in various fields due to its easy set-up process, various functions, convenience and expandability. Even in the field of safety evaluation and maintenance of large-scale infra-structures, the appropriate application of these effective and convenient measurement techniques can be of great help. In this paper, an experimental study was conducted to investigate the effectiveness, problems and complementary methods of applying smart-phone accelerometers to the measurement in infra-structure such as bridges. In model bridge subjected to impact and moving loads, the measured accelerations using a smart-phone and a professional accelerometer were directly compared in time domain. And the statistical and frequency characteristics of the measured signal and transfer function were also examined in frequency domain. The results show that the accuracy of measurement using smart-phone sensor is primarily affected by its incomplete sampling performance. In conclusion, smart-phone sensors cannot be considered suitable for precise assessment, where measurements must be accurate over a wide frequency range, but we can say that the technique is still useful and fairly accurate for some purpose over a limited frequency range, such as the low pass frequency range, which is a major concern for civil structures.

References

  1. Alessandro Sabato and Maria Q. Feng, "Feasibility of Frequency-Modulated Wireless Transmission for a Multi-Purpose MEMS-Based Accelerometer", Sensors. 14(9), pp. 16563-16585, (2014) https://doi.org/10.3390/s140916563
  2. A. Sharma and D. Gupta, "Smartphone as a real-time and participatory data collection tool for civil engineers", Int. J. Modrn. Comput. Sci., 2(5), pp. 22-27, (2014)
  3. Paul Cahill, Lucy Quirk, Priyanshu Dewan and Vikram Pakrashi, "Comparison of smartphone accelerometer applications for structural vibration monitoring", Advances in Computational Design, Volume 4, Issue 1, pp.1-13, (2019) https://doi.org/10.12989/ACD.2019.4.1.001
  4. Adam J. Bittel, Ashraf Elazzazi, and Daniel C. Bittel, "Accuracy and Precision of an Accelerometer-Based Smartphone App Designed to Monitor and Record Angular Movement over Time", Telemedicine and e-Health, Vol. 22, No. 4, pp. 302-309, (2016) https://doi.org/10.1089/tmj.2015.0063
  5. H. Zui, T. Shinke and Y. Namita,, Practical Formulas for Estimation of Cable Tension by Vibration Method. ASCE Journal of SE, Vol. 122, No. 6, pp. 651-656, (1996) https://doi.org/10.1061/(ASCE)0733-9445(1996)122:6(651)
  6. Damir Zenunovic, Mirsad Topalovic, Radomir Folic, "Identification of Modal Parameters of Bridges Using Ambient Vibration Measurements", Shock and Vibration, Vol. 2015, pp. 1-21, (2015)
  7. 김두기 : 구조동역학, 4판, 구미서관, 서울, (2017)
  8. Michael B. del Rosario, Stephen J. Redmond and Nigel H. Lovell, "Tracking the Evolution of Smartphone Sensing for Monitoring Human Movement, Sensors, 15, pp. 18901-18933, (2015) https://doi.org/10.3390/s150818901