Quantitative Bridge Inspection Ratings using Autonomous Robotic Systems (Im-2)
Universities: The City College of New York
Missouri University of Science and Technology
University of Colorado - Boulder
Principal Investigator: Dr. Anil Agrawal, The City College of New York
PI Contact Information: Phone: (202) 650-8442 | Email: email@example.com
Co-Principal Investigators: Dr. Jizhong Xiao, The City College of New York
Dr. Genda Chen, Missouri University of Science and Technology
Dr. George Hearn, University of Colorado - Boulder
Funding Sources and Amounts Provided:
The City College of New York: $197,376
INSPIRE UTC: $143,443
Total Project Cost: $340,819
Match Agencies ID or Contract Number:
CCNY: In-Kind Match | INSPIRE UTC: 00055082-01B
INSPIRE Grant Award Number: 69A3551747126
Start Date: March 1, 2017
End Date: December 31, 2018
Brief Description of Research Project:
The 2001 study sponsored by FHWA raised serious concern on the consistency and reliability of visual inspection. Although consistent ratings can be obtained with a good QA/QC program, based on a recent study by the PI, the concern for reliability of defect detection remains. With the adoption of the recent AASHTO Manuel for Bridge Element Inspection, the new inspection approach not only requires rating for bridge elements, but also the location and extent of deterioration. Since autonomous robotic systems (UAS) generate an enormous amount of inspection data, deducing from the data to a simple rating along with the location and extent of deterioration is a significant challenge. For example, RABITTM has been used to inspect concrete bridge decks with six devices, including ground penetrating radar (GPR), impact-echo and ultrasonic surface wave. However, the probability of detection (POD) for damage has not been fully demonstrated to be significantly improved using multiple devices.
Approach and Methodology. Data fusion will be used to derive a rating from test data from multiple NDE devices and visual inspections in two steps. First, location and extent of deterioration, such as delamination, will be determined by fusing data from NDE devices. Currently, almost all data fusion techniques are based on the measurement outputs of multiple devices. In this study, the wave-structure interaction leading to the measurement outcomes will be taken into account in data fusion, potentially resulting in more consistent identification of deterioration. Second, once identified reliably, damage data and visual inspection findings can be fused to determine a rating through algorithms such as artificial neural network and Fuzzy logic, while minimizing false positives and particularly false negatives. Training data for the algorithms will come from existing experience on the type and extent of deterioration and damage through inspection reports and experience of inspectors (e.g. 21 bridge inspection teams that the PI has worked with during the recent study).
Overall Objectives. This project aims to develop new fusion strategies of data collected from multiple NDE devices for improved POD based on further understanding and modeling of damage detection mechanisms, and to develop algorithms for the derivation of bridge ratings from identified damage and visual inspection findings.
Scope of Work in Year 1: (1) Develop a framework of quantitative bridge inspection using relevant data from the literature and those derived from NDE devices, (2) Identify potential NDE devices for different bridge elements, (3) Characterize POD and its improvement through data fusion.
Scope of Work in Year 2: (1) Review UAS-assisted bridge inspection literature and identify a suitable UAS platform for cost-effective yet reliable inspection of bridges, (2) Develop a detailed plan of a comparative study between regular inspection and the UAS-based inspection that mimics the regular inspection and optimize the UAS-based inspection after practical limitations have been identified, (3) Carry out UAS inspection of selected bridges, and (4) Conduct and report a comparative analysis of UAS and regular inspections.
Describe Implementation of Research Outcomes:
Research outcomes and implementation plan will be described towards the end of this project.
Impacts/Benefits of Implementation:
Impact/Benefits of Implementation will be summarized at the end of this project.
Project Website: http://inspire-utc.mst.edu/researchprojects/im-2/