Special Coverage

Home

Simulation and Visualization of Elastodynamics in Time- Evolving Generalized Curvilinear Coordinates

Deforming grids and stresses can be visualized as the solution proceeds in time. Ames Research Center, Moffett Field, California This innovation unifies an earlier innovation and a new solution method based on finite differences to simulate structural dynamic phenomena over time-varying grids in generalized curvilinear coordinates. The methodology is based on physics-based first principles partial differential equations of elastodynamics in the space-time domain. It provides a powerful, yet simple methodology to compute structural dynamic variables of interest such as stresses over an entire grid mapped over or inside a given body of interest directly in the time domain. The grid can be allowed to deform in time as the solution evolves. The simulation (deforming grids and stresses) can be visualized as the solution proceeds in time; the simulation can be suspended at any point in time based on the visualization of the state of the system, and the simulation can be resumed/terminated altogether as the evolving solution proceeds within/outside the expectation bounds dictated by physics. The attractiveness of the innovation lies in the intuitiveness of the approach where the physical variables such as stresses and the displacements can be visualized directly in space and time as the simulation proceeds.

Posted in: Briefs, Electronics & Computers

Read More >>

3D Finite Element Model of Magnetic Mirror and Nano Antenna

Simulations are considerably cheaper and faster than the fabrication process. Goddard Space Flight Center, Greenbelt, Maryland A 3D finite element mathematical model has been developed for representing a behavior of a magnetic mirror and nano antenna subject to polarized incident light. This model represents the fourth generation of magnetic mirror with the goal of suppressing the diffraction.

Posted in: Briefs, Electronics & Computers

Read More >>

Toolbox for Modeling and Analysis of Thermodynamic Systems (T-MATS)

Tools are included to make model creation easier than before. John H. Glenn Research Center, Cleveland, Ohio T-MATS is an open-source Simulink library for use in modeling and simulation of thermodynamic systems. It provides a user friendly graphical MATLAB/Simulink-compatible toolbox along with tools to increase ease of model creation. It also includes a generic nonlinear solver that allows the designer to ensure that all conservation equations are respected at every time step.

Posted in: Briefs, Electronics & Computers

Read More >>

Advanced Numerical Tools for Design and Analysis of In-Space Valve and Feed Systems

Marshall Space Flight Center, Alabama A high-fidelity numerical simulation software (CRUNCH CFD®) predicts the transient performance of flight valve designs, provides design support by supplementing current empirical rules, and diagnoses system anomalies. Currently, transient analysis of valves is difficult to simulate because of the requirement to dynamically deform the grid due to the valve motion. For complex, transient problems such as engine startup or shutdown that also involve dynamic sealing of fluid flow paths due to valve/solid surface contact, it becomes nearly impossible to deform the grid in an automated fashion.

Posted in: Briefs, Electronics & Computers

Read More >>

Global Elevation Data Adaptive Compression Algorithms

These algorithms can be used in applications requiring large databases of graphical information that are deployed via restricted environments, such as tablets and smartphones. Armstrong Flight Research Center, Edwards, California The Global Elevation Data Adaptive Compression Algorithms (GEDACA) were developed to provide compression and rapid decompression of digital terrain maps (DTMs) in constrained computing environments. The primary purpose of these algorithms is to create and utilize highly compressed digital terrain data representing the geographical areas of the entire world to enable Automatic Ground Collision Avoidance Systems (Auto-GCAS) for high-performance fighter aircraft. The data is formatted to be accessible anywhere in the world in real time, and also allows for control of data resolution to support the complete range of high-performance aircraft operations. Other uses include applications that require large databases of graphical information and are deployed via restricted environments, such as tablets and smartphones.

Posted in: Briefs, Electronics & Computers

Read More >>

Cassini Science Planning and Sequencing Team Final Sequence Approval Document Generator (Autodoc)

NASA’s Jet Propulsion Laboratory, Pasadena, California Documents, such as reports that are consistent in format, are excellent candidates for automation. Autodoc was designed as a means to automate such reports in order to reduce the amount of labor necessary to produce reports, and to improve the accuracy of the reports.

Posted in: Briefs, Electronics & Computers

Read More >>

Exploration Visualization Environment

New user interface is designed to provide a more consistent look and feel for data entry, and a single hierarchy display for traversing the scene. Langley Research Center, Hampton, Virginia The Exploration Visualization Environment (EVE) is a graphical environment for the visualization, analysis, and simulation of engineering data, specializing in aerospace and aeronautic concepts. EVE is based on the history and successful application of the Synergistic Engineering Environment (SEE) and provides much of the same capabilities. These include integration of time-dependent data with detailed graphical models, enhanced user navigation and time controls, synchronized display of data with simulation playback, and cross-platform support of Windows and Linux.

Posted in: Briefs, Electronics & Computers

Read More >>