Subhrajit Roychowdhury
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View article: Resilient Energy Delivery and Control Systems (REDCS) (Final Technical Report)
Resilient Energy Delivery and Control Systems (REDCS) (Final Technical Report) Open
View article: Adaptive Cyber-PhysicalResilience for Building ControlSystems
Adaptive Cyber-PhysicalResilience for Building ControlSystems Open
The main goal of the project is to develop an AI-based process layer cybersecurity suite for detection, isolation and mitigation of cyber-attack effects on operation of building energy management systems (BEMS). The following constituent k…
View article: Virtual sensor supervised learning for cyber-attack neutralization
Virtual sensor supervised learning for cyber-attack neutralization Open
An industrial asset may have monitoring nodes that generate current monitoring node values. A dynamic, resilient estimator may split a temporal monitoring node space into normal and one or more abnormal subspaces associated with different …
View article: Dynamic, resilient virtual sensing system and shadow controller for cyber-attack neutralization
Dynamic, resilient virtual sensing system and shadow controller for cyber-attack neutralization Open
An industrial asset may have monitoring nodes (e.g., sensor or actuator nodes) that generate current monitoring node values. An abnormality detection and localization computer may receive the series of current monitoring node values and ou…
View article: Elucidating precipitation in FeCrAl alloys through explainable AI: A case study
Elucidating precipitation in FeCrAl alloys through explainable AI: A case study Open
A primary challenge of using FeCrAl in high temperature industrial settings is the formation of α′-precipitates that causes brittleness in the alloy, resulting in failure through fracture. The precipitation causes hardness change during th…
View article: Dynamic, resilient sensing system for automatic cyber-attack neutralization
Dynamic, resilient sensing system for automatic cyber-attack neutralization Open
An industrial asset may have monitoring nodes that generate current monitoring node values. An abnormality detection computer may determine that an abnormal monitoring node is currently being attacked or experiencing fault. A dynamic, resi…
View article: Optimizing chemistry for designing oxidation resistant FeCrAl alloys
Optimizing chemistry for designing oxidation resistant FeCrAl alloys Open
View article: High frequency beam oscillation keyhole dynamics in laser melting revealed by in-situ x-ray imaging
High frequency beam oscillation keyhole dynamics in laser melting revealed by in-situ x-ray imaging Open
The metal additive manufacturing industry is actively developing instruments and strategies to enable higher productivity, optimal build quality, and controllable as-built microstructure. A beam controlling technique, laser oscillation has…
View article: Data-driven predictive modeling of FeCrAl oxidation
Data-driven predictive modeling of FeCrAl oxidation Open
View article: Understanding oxidation of Fe-Cr-Al alloys through explainable artificial intelligence
Understanding oxidation of Fe-Cr-Al alloys through explainable artificial intelligence Open
View article: Elucidating Precipitation in FeCrAl Alloys through Explainable AI: A Case Study
Elucidating Precipitation in FeCrAl Alloys through Explainable AI: A Case Study Open
Primary challenge of using FeCrAl in high temperature industrial setting is the formation of α’- precipitates that causes brittleness in the alloy, resulting in failure through fracture. The precipitation causes hardness change during ther…
View article: Understanding oxidation of Fe-Cr-Al alloys through Explainable Artificial Intelligence
Understanding oxidation of Fe-Cr-Al alloys through Explainable Artificial Intelligence Open
The effect of alloy composition and oxidation condition on specific mass gain of FeCrAl alloys was studied and analyzed using a combination of experimental and AI approaches. A Neural Network (NN) classification model was used on the exper…
View article: A study of high frequency laser beam oscillation induced keyhole dynamics in laser powder bed fusion additive manufacturing process
A study of high frequency laser beam oscillation induced keyhole dynamics in laser powder bed fusion additive manufacturing process Open
The metal additive manufacturing (AM) industry is actively developing instruments and strategies to enable higher productivity, optimal build quality, and controllable as-built microstructure. One of the beam controlling techniques, laser …
View article: Understanding Impacts of Chemistry on Oxidation of FeCrAl Alloys
Understanding Impacts of Chemistry on Oxidation of FeCrAl Alloys Open
Traditionally, FeCrAl alloys played an important role in high-temperature applications due to their ability to form a passive Al oxide film at temperatures above ~800°C. Recently, FeCrAl alloys became of interest for the application of acc…
View article: Trajectory Planning for Aerospace Vehicles using Deep Reinforcement Learning.
Trajectory Planning for Aerospace Vehicles using Deep Reinforcement Learning. Open
View article: Cyber Physical Protection for Natural Gas Compression
Cyber Physical Protection for Natural Gas Compression Open
The secure transport of natural gas through North American pipelines is vital for both home and industrial purposes. GE in collaboration with Baker Hughes and Idaho National Laboratory, completed a US Department of Energy grant program to …
View article: In situ process quality monitoring and defect detection for direct metal laser melting
In situ process quality monitoring and defect detection for direct metal laser melting Open
Quality control and quality assurance are challenges in direct metal laser melting (DMLM). Intermittent machine diagnostics and downstream part inspections catch problems after undue cost has been incurred processing defective parts. In th…