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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Trajectory Design Using a Dynamical Systems Approach With Application to Genesis
A number of missions have recently been proposed that aim to take advantage of the growing scientific interest in the region of space near libration points in the Sun-Earth system. In support of missions that include increasingly complex trajectories and incorporate libration point orbits, more efficient techniques and new philosophies for design must be considered.
Future trajectories of the Solar System: dynamical simulations of stellar encounters within 100 au
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Physics-Informed Spatiotemporal Deep Learning for Emulating Coupled Dynamical Systems
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An Overview of Sequential Data Assimilation for Nonlinear Dynamical Systems.
Abstract not provided.
Pressio: A Computational Framework Enabling Projection-Based Model Reduction for Large-Scale Nonlinear Dynamical Systems.
Abstract not provided.
Nonlinear analysis and performance of energy harvesting absorbers with stoppers for controlling fluid-induced vibrations of dynamical systems.
Abstract not provided.
Numerical investigation and experimental verification of a directly-excited dynamical system with freeplay nonlinearity.
Abstract not provided.
Parameter estimation for dynamical systems under continuous and discontinuous Gaussian noise using data assimilation techniques.
Abstract not provided.
TOWARD PARALLEL IN TIME FOR CHAOTIC DYNAMICAL SYSTEMS
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Uncertainty Quantification in High-Low Dynamic System Coupling using RAVEN and TRANSFORM
This work demonstrates new functionality and applications stemming from the development of high-fidelity to low-fidelity (high-low) coupling for system simulations and to further explore the capabilities of the Risk Analysis Virtual Environment (RAVEN) in the performance of uncertainty quantification in this kind of high-low coupled system models. The work builds from previous work on high-low coupling that utilized COBRA-TF (CTF), the high-fidelity subchannel analysis code, with a low fidelity model built in ORNL’s TRANSFORM, the system analysis code, utilizing the Functional Mock-Up Interface (FMI). Steady-state and transient analysis examples using the high/low coupled models generated from CTF and TRANSFORM/FMI are investigated. The workflows for both steady-state and transient coupled simulations are described. A steady-state parameter sweep and uncertainty analysis of the primary flow rates and reactor power are demonstrated. Likewise, a transient pump trip and power ramp sensitivity studies are also demonstrated. This work elucidates some of the potential benefits and future needs of using RAVEN for high/low system coupling analysis of energy systems. It also shows some of the difficulties that can be encountered in coupling system simulations.
Sensitivity Analysis and Model Reduction in Plasma Dynamical Systems.
Abstract not provided.
Exploring Optimization and Robust Control Techniques for use in Control Design of Nonlinear Dynamic Systems.
Abstract not provided.
SOURCE TERM AND DEPLETION COUPLING WITH DYNAMIC SYSTEM MODELING SOLUTIONS FOR FUEL CYCLE OPERATIONS
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Effectiveness And Nonlinear Characterization Of Energy Harvesting Absorbers With Stoppers In Controlling Dynamical Systems.
Abstract not provided.