Multipoint Wave Measurement in Tuned Liquid Damper Using Laser Doppler Vibrometer and Stepwise Rotating Galvanometer...

Area of Science:

• Structural Engineering
• Mechanical Engineering
• Vibration Control

Background:

• Tuned liquid dampers (TLDs) are crucial for mitigating wind-induced building vibrations.
• Optimizing TLD efficiency requires matching its tuning frequency to the building's natural frequency.
• Accurate pre-installation experimental evaluation of TLDs necessitates multipoint measurements.

Purpose of the Study:

• To develop a novel system for multipoint liquid level measurement in TLDs.
• To enable simultaneous measurement of liquid sloshing at multiple points using a single laser.
• To experimentally evaluate the natural frequency and mode shape of a TLD.

Main Methods:

• Integration of Laser Doppler Vibrometer (LDV) with a stepwise rotating galvanometer scanner.
• Development of a system for non-contact, multipoint liquid level observation.
• Experimental evaluation of TLD natural frequency and mode shape using the developed system.

Main Results:

• The proposed system successfully measures liquid levels at multiple points simultaneously.
• The system enables accurate experimental evaluation of TLD natural frequency and mode shape.
• Performance validation confirmed by comparison with a video sensing system.

Conclusions:

• The novel LDV-based system provides an efficient method for multipoint liquid level measurement in TLDs.
• This system is critical for ensuring the correct tuning and performance of TLDs before building installation.
• The developed technology enhances the process of optimizing vibration suppression in structures.