Ultrasonic Tomography for Infrastructure Inspection
| 项目名称： | Ultrasonic Tomography for Infrastructure Inspection |
| 摘要： | The structural integrity of railroad infrastructure is critical in order to address structural repair needs in a timely fashion and ensure rail safety. This includes the regular inspection and maintenance of railroad tunnel linings and timber beams and ties. Since tunnels are naturally in an aggressive environment that is not conducive to lane closures, early detection that leads to preventive maintenance is a necessity. The occurrence of damage and deterioration in railroad timber beams and ties can lead to failure of the components and, in the worst case, derailment of the train. According to the Federal Railroad Administration, wide gages due to defective/missing cross ties accounted for the highest percentage (17.1%) of all railway accidents in the US from 2008-2011 (FRA, 2011). It is therefore crucial to detect damage at an early stage so that, by taking appropriate measures, failure can be prevented. The proposed project will examine the use of Ultrasonic Tomography (UST) to examine the interior of wooden beams and cross ties as well as railroad tunnel linings on-site. The Ultrasonic Tomographer employs a matrix (4x12) of low-frequency, shear transducers that generate shear waves through the depth of a specimen under test. The waves are reflected by internal discontinuities and changes in medium (such as concrete, air, and steel). This behavior is utilized to map voids, delamination, cracks, and other defects, as well as structural depth and reinforcement presence. The waves are sequentially emitted and received by 66 paired transducers per single scan, causing repeated reflections and patterns to stand out for inspection. Through the use of dry-point-contact piezoelectric sensors, the transducers do not require the use of a coupling agent, making it practical for on-site applications. The recorded signals undergo automated signal processing to identify the existence, location, and size of the potential discontinuities. The UST technique can be used to map entire three dimensional (3D) images of concrete sections as well as single-point evaluations. |
| 状态： | Active |
| 资金： | $159,562 |
| 资助组织： | Research and Innovative Technology Administration<==>Texas A&M University, College Station |
| 执行机构： | Texas A&M University, College Station |
| 开始时间： | 20140101 |
| 预计完成日期： | 20161231 |
| 实际结束时间： | 20161231 |
| 主题领域： | Bridges and other structures；Maintenance and Preservation；Railroads |
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