Vehicle Technology Directorate, Vehicle Technology Directorate, Propulsion Division
||Abredeen Proving Ground, MD 210055066
ARL conducts basic and applied research involving propulsion material state awareness for rotorcraft. Specialized engine and drivetrain materials require continual improvements to expand performance of aerospace propulsion systems. This research is a critical part of on-going mission programs toward developing advanced propulsion material state awareness methodologies for current and future Army vehicles. This research effort will focus on development of advanced experimental and analytical methods for propulsion material state awareness in Army vehicles, identification of thermomechanical fatigue driven damage nucleation and micro damage precursors in propulsion materials, discovery and improvement of engineered high-temperature materials to mitigate thermomechanical fatigue damage nucleation, which are fatigue resistant, wear erosion resistant, foreign object damage impact resistant via analytical and/or computational models and experimental validation.
Research proposals are invited to develop propulsion material state awareness methods based on first principles (e.g., physics, material science based methods) and damage evolution characteristics. The areas of technical interest include, but are not limited to, propulsion material damage precursors nucleation and propagation, prediction of remaining useful life of a component and/or system, investigation into advanced high-temperature sensing materials, sensors and sensor arrays, advanced signal processing techniques, sensor optimization and placement, data fusion, component and propulsion engine/drivetrain system level reasoners and reasoning methods, advanced propulsion material state awareness hardware/software, self-responsive engineered high-temperature materials leading to total propulsion material state awareness that can reduce the logistics footprint and life-cycle costs while increasing vehicle availability.
Some possible research topics include: Propulsion Material State Awareness, which includes (1) creating high-temperature embedding, minimally invasive or nonintrusive sensing systems for physical measurements (strain, acceleration, heat flux, ultrasonic, capacitance, tip clearance) based on new high Curie temperature piezoelectric, piezoresistive, capacitive, magnetostrictive, and fiber optic sensing materials; (2) determining sensor driven remaining life estimation using physics models considering uncertainty in material structure/properties and environment; (3) repairing and healing ceramic composites through embedded microwave systems; (4) creating physics models for coupled field behavior (i.e., resistance/capacitance and thermomechanical, dielectric, optomechanical); (5) establishing a virtual testbed using a combination of gas path analysis, model predictive analysis, and instrumented engine response leading to evaluation and optimal placement of new (low cost) sensor technologies; (6)facilitating data driven propulsion material state awareness including data compression techniques and optimal/suboptimal sensor strategies; (7) developing propulsion system and subsystem level reasoners including engine and drivetrain system reasoned; and (8) developing reliability and life prediction models for propulsion materials using probabilistic analysis techniques incorporating the physics of evolution of material damage precursors, damage nucleation, and damage propagation across length scales.
Ghoshal A, Kim HS, Le DD: Sensor Review 32(1): 66, 2012
Liu KC, Ghoshal A: Composite Structures 108: 311, 2013
High temperature sensing; Propulsion material state awareness; Turboshaft gas turbine engines; Propulsion system health management; Propulsion material damage precursors; Rotorcraft engine; Aircraft; Propulsion; Drivetrain systems;