• Title/Summary/Keyword: 진동센서

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Low-Velocity Impact Detection of Composite Plate Using Piezopolymer Sensor Signals without Charge Amplifier (전하증폭기를 사용하지 않은 고분자 압전센서 신호를 이용한 복합재 평판의 저속충격 탐지)

  • 김인걸;정석모
    • Composites Research
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    • v.13 no.6
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    • pp.47-54
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    • 2000

  • One promising method for impact detection of composite structures is based on the use of piezopolymer thin fim (PVDf) sensor. In this paper, the relationship between the contact force and the signals of the attached strain gage and PVDF sensor to the composite plate subjected to low-velocity impact were derived. The relation for the open circuit and short circuit voltage of PVDF sensor was derived based on the equivalent circuit model of the piezoelectric sensor. The work was then extended to include experimental investigation into the use of short circuit voltage of PVDF sensor without using charge amplifier to detect low-velocity impact. The natural frequencies and damping ratio of the composite plate obtained from the vibration test were used to modify the analytical model and therefore the differences between measured and simulated signal of the modified analytical model in both forward and backward problem were considerably reduced. The reconstructed contact force and simulated sensor signals agreed well with the measured contact force, strain gage signal, and PVDF sensor singanl.

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The Performance Analysis of the Parameter Extracting Technique for the Vibration Monitoring System in High Voltage Motor (고압전동기용 진동 감시 시스템의 계수 추출기법 성능 분석)

  • Park, Jung-Cheul;Lee, Dal-Ho
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.12 no.5
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    • pp.529-536
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    • 2019

  • In this paper, the signals of the sensor for extracting characteristic parameters of the rotor are collected and the performance of the extraction technique is analyzed. To this end, a vibration test league was developed for conducting model tests to analyze the signal characteristics under normal operation. As a result, it is judged that no change in the measured the raw data amplitude will occur in the acceleration sensor with the unbalanced mass measured from the acceleration sensor. Performing FFT showed a significant increase in amplitude of the rotational frequency of 20 Hz as the unbalanced mass increased. The analysis results according to the change in the unequal mass of the speed sensor also showed a significant increase in the 1X Harmonics component, such as the acceleration sensor. There was no change in the amplitude of the acceleration sensor data when the misalignment occurred, and for the Envelope data, the amplitude of 2X (40 Hz) was increased depending on the degree of misalignment. The velocity sensor at change of misalignment also showed similar results to the acceleration sensor, and the peak was reduced at 600 Hz as the load increased in the frequency spectrum.

  • https://doi.org/10.17661/jkiiect.2019.12.5.529 인용 PDF KSCI

Structural Health Monitoring of Harbor Structures using Imote2-Platformed Smart Wirless Sensor Node (Imote2 플랫폼 기반 스마트 무선센서노드를 이용한 항만구조물 건전성 모니터링)

  • Park, Jae-Hyung;Lee, So-Young;Kim, Jeong-Tae
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2011.04a
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    • pp.307-310
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    • 2011

  • 본 연구에서는 항만 구조물의 구조건전성 모니터링을 위한 Imote2 센서 플랫폼 기반의 스마트 무선센서의 적용성을 평가하였다. 이를 위해 먼저, 고민감도 MEMS 가속도계를 탑재한 Imote2 센서 플랫폼 기반스마트 무선센서를 설계하였다. 둘째, 스마트 무선센서노드의 독자적인 구조 상태 모니터링을 위한 내장소프트웨어를 설계하였다. 마지막으로, 모형 케이슨 구조물의 진동실험을 통해 개발된 스마트 무선센서의 성능을 검증하였다.

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