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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

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A new position measurement system using a motion-capture camera for wind tunnel tests.

Hyo Seon Park¹, Ji Young Kim, Jin Gi Kim

¹Department of Architectural Engineering, Yonsei University, 134 Shinchon-dong, Seoul 110-732, Korea. yskim1220@yonsei.ac.kr.

Sensors (Basel, Switzerland)

|September 26, 2013

Summary

This study introduces a motion-capture system (MCS) for wind tunnel testing, offering accurate displacement measurements for structures. The MCS demonstrated reliable performance, comparable to laser displacement sensors (LDS), for dynamic analysis.

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Area of Science:

Aerospace Engineering
Structural Dynamics
Experimental Fluid Dynamics

Background:

Wind tunnel testing requires non-intrusive measurement systems to avoid flow interference.
Accurate displacement measurement is crucial for analyzing structural responses under wind loads.

Purpose of the Study:

To evaluate the applicability of a motion-capture system (MCS) for measuring structural displacement responses in wind tunnel tests.
To compare the performance of MCS with a traditional laser displacement sensor (LDS).

Main Methods:

Utilized a motion-capture system (MCS) to capture 3D coordinates from 2D camera images.
Conducted wind tunnel tests on a pylon specimen.
Compared MCS displacement measurements with those from a laser displacement sensor (LDS).
Employed system identification methods, including frequency domain decomposition (FDD), to analyze dynamic properties.

Main Results:

MCS provided reliable time-history displacement measurements, showing slight discrepancies with LDS.
System identification using MCS data accurately determined the natural frequency, damping ratio, and mode shape.
MCS enabled the construction of a more accurate bending-deflection mode shape compared to LDS.

Conclusions:

The motion-capture system (MCS) is a viable and flexible tool for non-intrusive displacement measurements in wind tunnel experiments.
MCS offers comparable accuracy to LDS for dynamic analysis and can provide more detailed mode shape information.
The remote sensing capability of MCS enhances its applicability in various laboratory setups.