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Sensor Equipped UAS for Non-Contact Bridge Inspections: Field Application.

Roya Nasimi1, Fernando Moreu2, G Matthew Fricke3

  • 1The Department of Civil and Environmental Engineering, University of Nebraska-Lincoln, Lincoln, NE 68583, USA.

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|January 8, 2023
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Summary
This summary is machine-generated.

Uncrewed aerial systems (UASs) equipped with novel sensors offer a faster, safer method for structural inspections. This study validates a low-cost UAS system for measuring pedestrian bridge displacement without physical contact, paving the way for advanced infrastructure monitoring.

Keywords:
UASbridgecomputer visionfield implementationlow-cost sensing

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Area of Science:

  • Civil Engineering
  • Robotics
  • Structural Health Monitoring

Background:

  • Traditional structural inspections are often slow, costly, and pose safety risks, especially for large infrastructure like bridges.
  • Field validation of laboratory-developed inspection methods on real-scale structures is crucial for practical implementation.
  • Existing methods for measuring structural displacement can be labor-intensive and require sensor attachment, presenting challenges.

Purpose of the Study:

  • To present the full-scale field implementation of a novel Uncrewed Aerial System (UAS) sensor for non-contact transverse displacement measurement.
  • To adapt and upgrade a low-cost sensor system for testing on an in-service pedestrian bridge.
  • To demonstrate a UAS-based approach for measuring bridge displacement indicative of structural issues, reducing inspection costs and challenges.

Main Methods:

  • Utilized a commodity drone platform integrated with low-cost sensors, including a laser range-finder.
  • Developed and applied a computer vision-based algorithm for processing sensor data.
  • Conducted field experiments on an in-service pedestrian bridge to measure non-contact transverse displacement under load.

Main Results:

  • Successfully implemented and tested an upgraded UAS-based system for non-contact displacement measurement on a full-scale pedestrian bridge.
  • The system demonstrated the capability to measure transverse displacement, providing data indicative of potential structural problems.
  • The research defined the capabilities and limitations of the proposed low-cost system in real-world outdoor conditions.

Conclusions:

  • The developed UAS system offers a promising low-cost solution for non-contact structural displacement monitoring.
  • This technology has the potential to significantly improve the speed, safety, and efficiency of bridge inspections.
  • Further research can build upon this prototype to refine capabilities and expand applications in structural health monitoring.