An Improved Step-Type Liquid Level Sensing System for Bridge Structural Dynamic Deflection Monitoring

Area of Science:

• Structural Engineering
• Civil Engineering
• Sensor Technology

Background:

• Accurate dynamic deflection monitoring is crucial for bridge health and condition assessment.
• Traditional methods can be affected by inclination angles, impacting measurement precision.

Purpose of the Study:

• To introduce an improved step-type liquid level sensing system (LLSS) for precise dynamic deflection monitoring.
• To analyze and mitigate factors affecting measurement accuracy in structural health monitoring.

Main Methods:

• Replacing straight-line pipelines with step-type pipelines to eliminate inclination angle interference.
• Utilizing fluid dynamics analysis and ANSYS-FLOTRAN to study turbulent flow effects.
• Experimentally evaluating key parameters: initial displacement, step height, and measurement point distance from the elbow.

Main Results:

• Measurement accuracy is primarily influenced by turbulent flow generated by the step height.
• A distance of approximately 1.0 m from the elbow significantly reduces measurement error.
• To maintain <6% error, the measurement point must be placed >1.0 m from the elbow.

Conclusions:

• The step-type LLSS offers a viable solution for accurate dynamic deflection monitoring in bridges.
• Understanding and controlling turbulent flow is key to optimizing LLSS performance.
• Strategic placement of measurement points is essential for reliable structural health assessment.