Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Protocol implementation for simultaneous signal continuation acquisition of industrial plant machine condition in wireless sensor networks

산업플랜트 기계상태 동시신호 연속취득을 위한 무선센서 네트워크프로토콜 구현

  • Lee, Hoo-Rock (Korea Institute of Machinery and Materials) ;
  • Chung, Kyung-Yul (Division of Plant System and Machinery, University of Science & Technology) ;
  • Rhyu, Keel-Soo (Division of Information Technology, Korea Maritime and Ocean University)
  • Received : 2015.04.03
  • Accepted : 2015.08.26
  • Published : 2015.09.30
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Abstract

Wireless sensors, installed on machinery, and Time Division Multiple Access (TDMA) transmission make an ideal system for monitoring machine conditions in industrial plants because there is no need for electronic wiring. However, there has not yet been a successful field application of such a system, capable of continuously transmitting data at sample rates greater than 100 Hz. In this research, a TDMA network protocol capable of acquiring data from multiple sensors at sample rates greater than 100 Hz was developed for field application. The protocol was implemented in a single cluster-star topology network, and the system was evaluated based on the node number and transmission distance. Network simulator 2 (ns-2) was used for a real field simulation. Non-TDMA and TDMA protocol cases were compared using four sensor nodes. In the cases of 20-s and 40-s transmission times, there was little difference between the reception rates of the non-TDMA and TDMA systems. However, the difference was much greater when using a 60-s transmission time.

산업플랜트 현장에서 별도의 배선 없이 쉽고 빠르게 기계상태를 측정하기 위해서는 다중무선센서를 기계에 부착하고 측정과 전송이 동시에 가능한 시분할전송 방식이 필요하다. 그러나 아직까지 연속적인 신호를 동시에 100Hz이상 샘플로 시분할다중전송(TDMA;Time Division Multiple Access)하는 현장적용 연구가 알려지지 않고 있다. 따라서, 본 논문에서는 현장적용을 위해 100Hz이상의 샘플주기로 다수의 센서에서 동시에 취득할 수 있는 시분할다중전송 네트워크프로토콜을 구현하고 그 결과를 나타내고자 한다. 단일 클러스터 스타토폴로지를 대상으로 노드 개수와 거리에 따른 네트워크 가용성 확인을 위해 ns-2 시뮬레이터로 유사한 환경 조건으로 구동하여 결과를 분석하였다. 그 결과 4개의 센서노드로 동시에 연속적인 센서신호를 전송하는 비-시분할다중전송과 시분할다중전송프로토콜을 비교 분석하였다. 전송시간이 20초와 40초 일 경우는 수신율 차이가 작았지만 60초일 경우는 많은 차이를 나타냄을 관찰하였다.

Keywords

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