Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/32568
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dc.contributor.authorEvans, James A.-
dc.contributor.authorTallent, James R.-
dc.contributor.authorBrown, Richard D.-
dc.contributor.authorNetchaev, Anton D.-
dc.contributor.authorThurmer, Clayton R.-
dc.date.accessioned2019-04-24T15:45:18Z-
dc.date.available2019-04-24T15:45:18Z-
dc.date.issued2019-04-
dc.identifier.govdocERDC/ITL TR-19-2-
dc.identifier.urihttps://hdl.handle.net/11681/32568-
dc.identifier.urihttp://dx.doi.org/10.21079/11681/32568-
dc.descriptionTechnical Report-
dc.description.abstractNavigation structures such as miter gates and sluice gates are primarily made out of steel, which makes them highly susceptible to corrosion, pitting, and fatigue cracks after many years in service. To mitigate the corrosion issue, protective anti-corrosion epoxy coatings are applied to the steel surface before the structure goes into operation and following scheduled inspections if coating loss is detected. The inspection process is typically a costly and potentially dangerous endeavor due to the need to inspect submerged areas of the structure where structural and environmental conditions may be at their worst. Divers are often used when dewatering is too costly or not possible. This study was generated by the need to find a better solution to the navigational structure corrosion/coatings inspection process. Primary objectives of this endeavor are to improve inspection area coverage, reduce inspection subjectiveness, reduce time, reduce cost, and reduce risk to human life. To achieve these objectives, a sensor system was developed to collect corrosion data and anti-corrosion coating thickness data; the system was then integrated onto a semi-automated platform capable of traversing targeted inspection areas above and below the water surface. This platform is referred to as the Mobile Sensor Inspection Platform.en_US
dc.description.sponsorshipNavigation Systems Research Program (U.S.)en_US
dc.description.tableofcontentsAbstract .......................................................................................................................................................... ii Figures and Tables ......................................................................................................................................... v Preface ......................................................................................................................................................... viii Unit Conversion Factors ............................................................................................................................. ix 1 Introduction ............................................................................................................................................ 1 1.1 Background .................................................................................................................... 1 1.2 Objectives ...................................................................................................................... 5 1.3 Approach ........................................................................................................................ 5 2 Determining Miter Gate Plate Corrosion........................................................................................ 10 2.1 Existing technologies for miter gate plate corrosion assessment ............................ 10 2.1.1 Visual inspection ....................................................................................................... 10 2.1.2 Thermal imaging ....................................................................................................... 10 2.1.3 Ultrasonic Pulse-Echo technique ............................................................................. 11 2.1.4 Eddy Current technique ............................................................................................ 12 2.1.5 Magnetic Flux Leakage (MFL) technique ................................................................. 13 2.2 MFL for plate corrosion assessment .......................................................................... 13 2.2.1 MFL sensor technologies .......................................................................................... 14 2.2.2 MFL sensor circuit selection ..................................................................................... 16 2.2.3 MFL corrosion sensor test setup .............................................................................. 18 2.2.4 MFL corrosion sensor test procedure ...................................................................... 21 2.2.5 MFL corrosion sensor data analysis ........................................................................ 22 2.2.6 MFL corrosion sensor data comparison and anomalies ........................................ 26 2.2.7 MFL corrosion sensor package design .................................................................... 29 3 Determining Thickness of Anti-Corrosion Coatings ..................................................................... 33 3.1 Existing technologies for miter gate anti-corrosion thickness assessment of non-metallic coatings ............................................................................................................. 33 3.1.1 Electromagnetic Induction sensor ........................................................................... 33 3.1.2 Ultrasonic Pulse-Echo sensor ................................................................................... 34 3.1.3 Low-Coherence Interferometry sensor..................................................................... 34 3.1.4 Magnetic Pull-Off gage .............................................................................................. 35 3.2 Ultrasonic Pulse-Echo sensor design ......................................................................... 36 4 Development of Automated Mobile Sensor Inspection Platform.............................................. 39 4.1 Mobile Sensor Inspection Platform design ................................................................ 39 4.1.1 Initial MFL robot platform design ............................................................................. 39 4.1.2 Second MFL robot platform design .......................................................................... 40 4.1.3 MFL robot platform design ....................................................................................... 42 4.2 Mobile platform wheel design .................................................................................... 44 4.2.1 Initial magnetic wheel design ................................................................................... 44 4.2.2 Present magnetic wheel design ............................................................................... 45 4.3 Lateral motion of the Mobile Sensor Inspection Platform ........................................ 46 4.3.1 Mecanum wheels ...................................................................................................... 47 4.3.2 Expanding wheel concept ......................................................................................... 48 4.3.3 Mobile Sensor Inspection Platform water sealing ................................................... 48 4.4 Mobile Sensor Inspection Platform control and navigation ...................................... 49 4.4.1 Simplified navigation control .................................................................................... 50 4.4.2 Communication interface ......................................................................................... 52 5 Corrosion Sensor Data Collection and Management .................................................................. 53 6 Underwater Imaging System for Corrosion Assessment ............................................................ 54 6.1 Background .................................................................................................................. 54 6.2 Design considerations ................................................................................................. 55 7 Conclusions and Recommendations .............................................................................................. 57 References ................................................................................................................................................... 59 Appendix: Safe Underwater Corrosion Condition Assessment of Structures ................................. 61 Report Documentation Page-
dc.format.extent77 pages / 8.370 Mb-
dc.format.mediumPDF/A-
dc.language.isoen_USen_US
dc.publisherInformation Technology Laboratory (U.S.)en_US
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesTechnical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/ITL TR-19-2-
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat-
dc.subjectCorrosion and anti-corrosivesen_US
dc.subjectCorrosion--Detectorsen_US
dc.subjectCorrosion--Inspectionen_US
dc.subjectEpoxy coatingen_US
dc.subjectHydraulic gatesen_US
dc.subjectHydraulic structures--Maintenance and repairen_US
dc.subjectSluice gatesen_US
dc.subjectSteel--Corrosionen_US
dc.titleDetermining miter gate plate corrosion and thickness of anti-corrosion coatings; and development of a Mobile Sensor Inspection Platformen_US
dc.typeReporten_US
Appears in Collections:Technical Report

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