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Study on Wireless Acquisition of Vibration Signals

진동신호 무선 수집에 대한 연구

  • Lee, Sunpyo (Department of Mechanical System Engineering, Kyonggi Unversity)
  • 이선표 (경기대학교 기계시스템공학과)
  • Received : 2018.07.09
  • Accepted : 2018.07.25
  • Published : 2018.07.31

Abstract

A Wi-Fi signal network (WSN) system is introduced in this paper. This system consists of several data-transmitting sensor modules and a data-receiving server. Each sensor module and the server contain a unique intranet IP address. A piezoelectric accelerometer with a bandwidth of 12 kHz, a 24-bit analog-digital converter with a sampling rate of 15.625 kS/s, a 32-bit microprocessor unit, and a 1-Mbps Wi-Fi module are used in the data-transmitting sensor module. A 300-Mbps router and a PC are used in the server. The system is verified using an accelerometer calibrator. The voltage output from the sensor is converted into 24-bit digital data and transmitted via the Wi-Fi module. These data are received by a Wi-Fi router connected to a PC. The input frequencies of the accelerometer calibrator (320 Hz, 640 Hz, and 1280 Hz) are used in the data transfer verification. The received data are compared to the data retrieved directly from the analog-to-digital converter used in the sensor module. The comparison shows that the developed system represents the original data considerably well. Theoretically, the system can acquire vibration signals from 600 sensor modules at an accelerometer bandwidth of 15.625 kHz. However, delay exists owing to software processes, multiplexing between sensor modules, and the use of non-real time operating system. Hence, it is recommended that this system may be used to acquire vibration signals with up to 10 kHz, which is approximately 70% of the theoretical maximum speed of the system. The system can be upgraded using parts with higher performance

Keywords

References

  1. S. S. Jin, J. J. Lee, Y. H. Chon, J. W. Lee, and J. B. Yoon, "The Feasibility Study of Wireless Sensor Ireless for the Measurement of Ambient Vibration", Proc. Spring Conf., Korean Soc. Civil Eng., pp. 164-167, 2010.
  2. H. K. Kim and J. S. Jang, "Implementation of Wireless Data Acquisition of Embedded System for IT Convergence", Proc. Spring Conf., Korean Soc. Precis. Eng., pp. 723-724, 2011.
  3. W. K. Lee, S. W. Jung, and I. J. Jung, "Distributed TDMA Scheduling Algorithm for Industrial WSN to Reduce the Data Collection Delay of Emergency", Proc. Winter Conf., Korean Inst. Commun. Inf. Sci, pp. 43-44, 2014.
  4. S. H. Jung, S. J. Cho, and S. H. Shim, "Development of Integrated Vibration Control System Based on Wireless Sensors", Proc. Spring Conf., Korean Soc. Civ. Eng., pp. 82-83, 2016.