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2018 Vol.31, Issue 5 Preview Page
Measurement System of Dynamic Liquid Motion using a Laser Doppler Vibrometer and Galvanometer Scanner

액체거동의 비접촉 다점측정을 위한 레이저진동계와 갈바노미터스캐너 계측시스템

Junhee Kim1
,
Yoon-Soo Shin1
,
Kyung-Won Min1†
김 준 희1
,
신 윤 수1
,
민 경 원1†
1Department of Architectural Engineering, Dankook Univ., Yongin, 16890, Korea
1단국대학교 건축공학과
†Corresponding author: Tel: +82-31-8005-3738; E-mail: kwmin@dankook.ac.kr
2018. pp. 227-234
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Abstract

Researches regarding measurement and control of the dynamic behavior of liquid such as sloshing have been actively on undertaken in various engineering fields. Liquid vibration is being measured in the study of tuned liquid dampers(TLDs), which attenuates wind motion of buildings even in building structures. To overcome the limitations of existing wave height measurement sensors, a method of measuring liquid vibration in a TLD using a laser Doppler vibrometer(LDV) and galvanometer scanner is proposed in this paper: the principle of measuring speed and displacement is discussed; a system of multi-point measurement with a single point of LDV according to the operating principles of the galvanometer scanner is established. 4-point liquid vibration on the TLD is measured, and the time domain data of each point is compared with the conventional video sensing data. It was confirmed that the waveform is transformed into the traveling wave and the standing wave. In addition, the data with measurement delay are cross-correlated to perform singular value decomposition. The natural frequencies and mode shapes are compared using theoretical and video sensing results.

Keywords
liquid measurement
laser doppler vibrometer
galvanometer scanner
tuned liquid damper
vibration control device
laser scanning

슬로싱과 같은 액체의 동적 거동을 측정하고 제어하는 연구가 다양한 공학분야에서 활발히 진행중이다. 건축공학분야에서 도 건축물의 풍진동을 저감시키는 동조액체감쇠기의 연구에 액제 진동이 측정되고 있다. 본 논문에서는 기존 파고 측정 센 서의 한계를 극복하기 위하여 레이저 장비 중 LDV와 스캐닝 장비 중 갈바노미터스캐너를 이용하여 동조액체감쇠기 내의 액체 진동을 측정하는 방법을 제안하고 검증하였다. LDV가 속도와 변위를 측정하는 원리를 기술하였고 갈바노미터스캐너 의 구동 원리에 따라 LDV의 단일 포인트로 다점측정이 가능한 시스템을 구성하였다. 동조 액체감쇠기의 4점 액체 진동을 측정하여 각 점의 시간 영역 데이터를 기존에 사용하던 비디오 센싱 데이터와 비교하였고 파형 분석을 통해 진행파와 정상 파를 구별할 수 있음을 확인하였다. 또한 측정 딜레이가 있는 데이터를 상호 상관을 취하여 특이값 분해를 하고 이론 및 비 디오 센싱 결과와 일치하는 고유진동수와 모드형상을 도출하였다.

키워드
액체 진동 측정
레이저진동계
갈바노미터스캐너
동조액체감쇠기
진동제어장치
레이저스캐닝
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 31
  • No :5
  • Pages :227-234
  • Received Date : 2018-06-11
  • Revised Date : 2018-08-15
  • Accepted Date : 2018-08-16
  • DOI :https://doi.org/10.7734/COSEIK.2018.31.5.227
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