Measurement of Liquid Oscillation in Tuned Liquid Dampers using a Laser Doppler Vibrometer

Yoon-Soo Shin; Kyung-Won Min; Junhee Kim

doi:10.7734/COSEIK.2016.29.6.513

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2016 Vol.29, Issue 6 Preview Page Next Page

Measurement of Liquid Oscillation in Tuned Liquid Dampers using a Laser Doppler Vibrometer 레이저진동계를 사용한 동조액체댐퍼의 액체 진동 측정

2016. pp. 513-519

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Abstract

In this study, dynamic vertical displacement of liquid in the tuned liquid column damper(TLCD) is measured by a laser Doppler vibrometer(LDV) to overcome limitations of existing sensors and to leverage noncontact sensing. Addressing advantages of noncontact measurements, operational principles of the LDV to measure velocity and displacement of a target object in motion is explained. The feasibility of application of the LDV to measurement of liquid motion in the TLCD is experimentally explored. A series of shake table tests with the TLCD are performed to determine requirements of application of the LDV. Based on the experimental results, it is proved that the LDV works under the condition of adding dye to the liquid by increasing the intensity of reflected laser and thus validity is verified by comparison with a conventional wave height meter.

본 논문에서는 기존 파고 측정 센서의 한계를 극복하기 위하여 레이저 장비 중 LDV를 이용하여 동조액체기둥감쇠기 안 의 액체의 파고를 측정하는 방법을 제안하고 검증하였다. 비접촉 센서의 장점과 LDV가 속도와 변위를 측정하는 원리를 기 술하였고 대상 물체가 액체인 경우에 요구되는 사항들에 대하여 실험적으로 파악하였다. 투명한 액체는 레이저 광선을 대부 분 투과시켜 LDV에 되돌아오는 광량이 부족해 측정이 불가능함을 확인하였고 이를 증가시키기 위해 염료를 혼합하였다. 이 때, 염료의 색에 따라 광량에 차이가 발생함을 확인하여 LDV에 사용된 레이저 광선의 파장과 연관된 결과를 도출하였다. 염 료를 혼합한 후 광량이 충분한 경우에도 발생하는 데이터의 오차를 제거하기 위해 염료의 농도를 변화시키며 그에 따른 데 이터의 정확도를 파악하였다. 결과적으로 모든 가시광선의 빛을 반사시키는 흰색의 염료를 충분한 농도로 혼합하였을 때 LDV를 이용한 TLCD의 파고 측정의 실험적인 결과가 용량식 파고계와 일치함을 확인하였다.

키워드

액체 진동 측정

레이저진동계

동조액체기둥감쇠기

진동제어장치

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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 : 29
No :6
Pages :513-519
Received Date : 2016-08-30
Revised Date : 2016-09-29
Accepted Date : 2016-09-30
DOI :https://doi.org/10.7734/COSEIK.2016.29.6.513

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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