Publications

Investigations of degradation and encapsulation of plastic scintillator

Studies have revealed that plastic scintillators such as polyvinyl toluene and polystyrene can undergo environmentally related material …
Richard T.Kouzes, Herman M.Cho, Christian C.Cowles, Gerges Dib, Paul E. Keller, John E.Smart, Philip J.Smith, Brian J.Tucker, Patrick L.Feng, Nicholas R. Myllenbeck, Stephen Payne
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In-situ fatigue monitoring procedure using nonlinear ultrasonic surface waves considering the nonlinear effects in the measurement system

Second harmonic generation using nonlinear ultrasonic waves have been shown to be an early indicator of possible fatigue damage in …
Gerges Dib, Surajit Roy, Pradeep Ramuhalli, Jangbom Chai
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Ultrasound Modeling and Simulation: Status Update

The Pacific Northwest National Laboratory (PNNL) is conducting confirmatory research for the U.S. Nuclear Regulatory Commission for …
Gerges Dib, Michael R Larche, Matthew S Prowant, Richard E Jacob, Pradeep Ramuhalli, Aaron A Diaz
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Ensembles of novelty detection classifiers for structural health monitoring using guided waves

Guided wave structural health monitoring uses sparse sensor networks embedded in sophisticated structures for defect detection and …
Gerges Dib, Oleksii Karpenko, Ermias Koricho, Anton Khomenko, Mahmoodul Haq, Lalita Udpa
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Challenges and Solutions in SHM for Nuclear Power Environments

As the nation’s nuclear fleet looks to life extension, advanced reactor (AdvRx) concepts are being considered as alternatives that may …
Gerges Dib, Matthew Prowant, Morris Good, Pradeep Ramuhalli
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Preliminary design of high temperature ultrasonic transducers for liquid sodium environments

Advanced reactor concepts include fast reactors (including sodium-cooled fast reactors), gas-cooled reactors, and molten-salt reactors. …
Matthew S Prowant, Gerges Dib, H Qiao, Morris S Good, Michael R Larche, Samuel S Sexton, Pradeep Ramuhalli
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On the usage of ultrasound computational models for decision making under ambiguity

Computer modeling and simulation is becoming pervasive within the non-destructive evaluation (NDE) industry as a convenient tool for …
Gerges Dib, Samuel Sexton, Matthew Prowant, Susan Crawford, Aaron Diaz
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Integration and Assessment of Component Health Prognostics in Supervisory Control Systems

Enhanced risk monitors (ERMs) for active components in advanced reactor concepts use predictive estimates of component failure to …
Pradeep Ramuhalli, Chris Bonebrake, Gerges Dib, Surajit Roy
PDF Project

Validation of Ultrasonic Nondestructive Examination (NDE) Computational Models – Phase 1

The Pacific Northwest National Laboratory (PNNL) is conducting confirmatory research for the U.S. Nuclear Regulatory Commission for the …
Gerges Dib, Susan L Crawford, Richard E Jacob, Matthew S Prowant, Aaron A Diaz
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Detecting Water in Dry Storage Canisters for Used Fuel

As the United States transitions to storing used fuel from commercial nuclear reactors in interim dry storage facilities for extended …
Ryan M Meyer, Samuel W Glass III, Gerges Dib, Morris S Good, Surajit Roy, J Cuta, Ash Thakker
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PVT Degradation Studies: Acoustic Diagnostics

Under certain environmental conditions, polyvinyl toluene (PVT) plastic scintillator has been observed to undergo internal fogging. …
Gerges Dib, Brian J Tucker, Richard T Kouzes, Philip J Smith
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Summary Describing Integration of ERM Methodology into Supervisory Control Framework with Software Package Documentation

This project involved the development of enhanced risk monitors (ERMs) for active components in Advanced Reactor (AdvRx) designs by …
Pradeep Ramuhalli, Evelyn H Hirt, Gerges Dib, Arun Veeramany, Christopher Bonebrake, Surajit Roy
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Experimental Design for Evaluating Selected Nondestructive Measurement Technologies

The harsh environments in advanced reactors (AdvRx) increase the possibility of degradation of safety-critical passive components, and …
Pradeep Ramuhalli, Evelyn H Hirt, Stan G Pitman, Gerges Dib, Surajit Roy, Morris S Good, Cody M Walker
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Non-destructive Measurements for Diagnostics of Advanced Reactor Passive Components

Information on advanced reactor (AdvRx) component condition and failure probability is necessary to maintaining adequate safety margins …
M S Prowant, G Dib, S Roy, L Luzi, P Ramuhalli
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Design and performance of optimal detectors for guided wave structural health monitoring

Ultrasonic guided wave measurements in structural health monitoring systems are affected over a long term by measurement noise, …
Gerges Dib, Lalita Udpa
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Guided Wave Structural Health Monitoring for Impact Damage Detection and Characterization

Laminated composite structures are susceptible to impact damage mechanisms such as disbonds and delaminations that significantly weaken …
Gerges Dib, Oleksii Karpenko, Ermias Koricho, Mahmoodul Haq, Lalita Udpa, Satish S Udpa
PDF Project

State of the Art Assessment of NDE Techniques for Aging Cable Management in Nuclear Power Plants FY2015

This milestone report presents an update on the state-of-the-art review and research being conducted to identify key indicators of …
Samuel W Glass, Leonard S Fifield, Gerges Dib, Jonathan R Tedeschi, Mark A Jones, Trenton S Hartman
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Experimental validation of ultrasonic NDE simulation software

Computer modeling and simulation is becoming an essential tool for transducer design and insight into ultrasonic nondestructive …
Gerges Dib, Michael Larche, Aaron A Diaz, Susan L Crawford, Matthew S Prowant, Michael T Anderson
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Assessment of NDE for key indicators of aging cables in nuclear power plants – Interim status

Degradation of the cable jacket, electrical insulation, and other cable components of installed cables within nuclear power plants …
Samuel W Glass, Pradeep Ramuhalli, Leo S Fifield, Matthew S Prowant, Gerges Dib, John R Tedeschi, Jonathan D Suter, Mark A Jones, Morris S Good, Al F Pardini, Trenton S Hartman
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Progress towards prognostic health management of passive components in advanced reactors: Model selection and evaluation

This paper presents recent progress towards developing a prognostic health management framework for passive components of advanced …
Surajit Roy, Gerges Dib, Pradeep Ramuhalli, Evelyn H Hirt, Matthew S Prowant, Lorenzo Luzi, Allan F Pardini, Stan G Pitman
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Progress towards prognostic health management of passive components in advanced reactors: Model selection and evaluation

Component-Level Prognostics Health Management Framework for Passive Components

This report describes research results to date in support of the integration and demonstration of diagnostics technologies for …
Pradeep Ramuhalli, Surajit Roy, Evelyn H Hirt, Matthew S Prowant, Stan G Pitman, Joseph Tucker, Gerges Dib, Allan F Pardini
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Rotating field EC-GMR sensor for crack detection at fastener site in layered structures

Eddy current-based techniques have been investigated for the inspection of embedded cracks under fastener heads in riveted structures. …
Guang Yang, Gerges Dib, Lalita Udpa, Antonello Tamburrino, Satish S Udpa
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Multitechnique monitoring of fatigue damage in adhesively bonded composite lap-joints

The requirement for reduced structural weight has driven the development of adhesively bonded joints. However, a major issue preventing …
Oleksii Karpenko, Ermias Koricho, Anton Khomenko, Gerges Dib, Mahmoodul Haq, Lalita Udpa
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Image processing algorithms for automated analysis of GMR data from inspection of multilayer structures

Eddy current probes (EC) with Giant Magnetoresistive (GMR) sensors have recently emerged as a promising tool for rapid scanning of …
Oleksii Karpenko, Seyed Safdernejad, Gerges Dib, Lalita Udpa, Satish Udpa, Antonello Tamburrino
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Feasibility of PZT ceramics for impact damage detection in composite structures

Fiber reinforced plastic composites are becoming widely used in vehicles and airframe structures due to their high strength to weight …
Gerges Dib, Ermias Koricho, Oleksii Karpenko, Mahmoodul Haq, Lalita Udpa, Satish S Udpa
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EC-GMR array with rotating current excitation for multilayered riveted structures inspection

The challenge in detecting crack under fastener heads (CUF) in a multi-layered aircraft structure poses the need for advanced NDE …
Gerges Dib, Guang Yang, Chaofeng Ye, Antonello Tamburrino, Lalita Udpa, Satish S Udpa
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Advanced Signal Processing Algorithms in Structural Integrity Monitoring

Damage detection using Lead-Zirconate-Titanate (PZT) transducers for exciting guided waves was investigated. The analytical model for …
Gerges Dib, Oleksii Karpenko, Mahmoodul Haq, Lalita Udpa, Satish Udpa
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A Wireless Sensor Node for Structural Health Monitoring using Guided Wave Testing

The use of wireless sensor networks in structural health monitoring can significantly increase safety and reduce manufacturing and …
Gerges Dib, Ryan Lattrel, Guang Yang, Lalita Udpa
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Novel Mode Decomposition Algorithms for Lamb Wave Signal Analysis in Online Monitoring of Structures

Guided wave (GW) inspection systems offer the capability for online health monitoring of structures and hence the potential for …
Oleksii Karpenko, Gerges Dib, Mahmoodul Haq, Lalita Udpa, Satish S Udpa
PDF Project

Sensor-tilt invariance analysis for eddy current signals

In the application of electromagnetic nondestructive evaluation (NDE), the measured signals received by sensors are decided by the flaw …
Guang Yang, Zhiwei Zeng, Yiming Deng, Xin Liu, Gerges Dib, Lalita Udpa
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Pre-processing methods for eddy current data analysis using Hilbert-Huang Transform

An advanced nonlinear, non-stationary signal processing algorithm using Hilbert-Huang Transform is presented for automatic analysis of …
Guang Yang, Tariq Khan, Lu Zhang, Gerges Dib, Junjun Xin, Lalita Udpa, Shantanu Majumdar, Satish Udpa, Jaejoon Kim
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Nonlinear, non-stationary image processing technique for eddy current NDE

Automatic analysis of eddy current (EC) data has facilitated the analysis of large volumes of data generated in the inspection of steam …
Guang Yang, Gerges Dib, Jaejoon Kim, Lu Zhang, Junjun Xin, Lalita Udpa
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High performance wireless sensors system for structural health monitoring

Continuous structural health monitoring (SHM) uses permanently mounted sensor networks on critical locations of a structural component. …
Gerges Dib, Janardhin Padiyar, Junjun Xin, Lalita Udpa, Krishnan Balasubramaniam
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Wireless NDE sensor system for continuous monitoring

For continuous monitoring of power-plant components, the use of in-situ sensors (i.e., sensors that are permanently mounted on the …
Gerges Dib, Lassaad Mhamdi, Tariq Khan, Lalita Udpa, Nizar Lajnef, J-W Hong, Satish S Udpa, Pradeep Ramuhalli, Krishnan Balasubramaniam
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