Keyword: Scale models

Application Briefs: Photonics/Optics

Disaster relief workers, border patrol officers, wildfire fighters, and many others need up-to-date information about what they will see when they enter an area, not just sketchy topographic maps that...

Briefs: Mechanical & Fluid Systems
Levitated Duct Fan (LDF) Aircraft Auxiliary Generator

This generator concept includes a novel stator and rotor architecture made from composite material with blades attached to the outer rotating shell of a ducted fan drum rotor, a non-contact support system between the stator and rotor using magnetic fields to provide levitation, and an...

Briefs: Information Technology
Kalman Orbit Optimized Loop Tracking

Under certain conditions of low signal power and/or high noise, there is insufficient signal to noise ratio (SNR) to close tracking loops with individual signals on orbiting Global Navigation Satellite System (GNSS) receivers. In addition, the processing power available from flight computers is not great...

Articles: Sensors/Data Acquisition

As any dolphin could tell us, sound travels well in water. While water absorbs electromagnetic radiation and light waves over relatively short distances, sound travels widely and...

Briefs: Information Technology
Large Eddy Simulation Study for Fluid Disintegration and Mixing

A new modeling approach is based on the concept of large eddy simulation (LES) within which the large scales are computed and the small scales are modeled. The new approach is expected to retain the fidelity of the physics while also being computationally efficient. Typically, only...

Articles: Medical

In a new series, the editors of NASA Tech Briefs magazine catch up with everyday engineers about their unique responsibilities and challenges. This week, we highlight fellow...

Application Briefs: Robotics, Automation & Control
Creo Direct v17 modeling design software
PTC Corp.
Needham, MA
781-370-5000
www.ptc.com

There are several robotic arms on the International Space...

Briefs: Physical Sciences
Helium-Cooled Black Shroud for Subscale Cryogenic Testing

This shroud provides a deep-space simulating environment for testing scaled-down models of passively cooling systems for spaceflight optics and instruments. It is used inside a liquid-nitrogen-cooled vacuum chamber, and it is cooled by liquid helium to 5 K. It has an inside geometry of...

Application Briefs: Motion Control

How do you test the behavior of different soil structures in an earthquake? Obviously, large earthquakes don’t happen often, and they certainly don’t happen on cue. The...

Briefs: Information Technology
Improved Systematic Pointing Error Model for the DSN Antennas

New pointing models have been developed for large reflector antennas whose construction is founded on elevation over azimuth mount. At JPL, the new models were applied to the Deep Space Network (DSN) 34-meter antenna’s subnet for corrections of their systematic pointing errors; it...

Briefs: Green Design & Manufacturing

CgWind is a new, high-fidelity simulation tool designed to meet the modeling requirements of advanced wind energy resources. These new resources, targeting 20% of the US...

Articles: Imaging

The first 3D immersive environments, consisting of rudimentary software, projection, and display technologies, appeared two or more decades ago, but the past five years have seen a dramatic increase in the...

Briefs: Manufacturing & Prototyping
Range 7 Scanner Integration With PaR Robot Scanning System

An interface bracket and coordinate transformation matrices were designed to allow the Range 7 scanner to be mounted on the PaR Robot detector arm for scanning the heat shield or other object placed in the test cell. A process was designed for using Rapid Form XOR to stitch data from...

Briefs: Semiconductors & ICs
SAD5 Stereo Correlation Line-Striping in an FPGA

High precision SAD5 stereo computations can be performed in an FPGA (field-programmable gate array) at much higher speeds than possible in a conventional CPU (central processing unit), but this uses large amounts of FPGA resources that scale with image size. Of the two key resources in an FPGA,...

Briefs: Information Technology
Visual Object Recognition and Tracking of Tools

A method has been created to automatically build an algorithm off-line, using computer-aided design (CAD) models, and to apply this at runtime. The object type is discriminated, and the position and orientation are identified. This system can work with a single image and can provide improved...

Articles: Photonics/Optics

As recent events in Haiti and Argentina have highlighted, many urban buildings in seismically active regions worldwide are in need of reinforcement to resist earthquake damage. One challenge...

Briefs: Materials
Modeling of Alkane Oxidation Using Constituents and Species

It is currently not possible to perform simulations of turbulent reactive flows due in particular to complex chemistry, which may contain thousands of reactions and hundreds of species. This complex chemistry results in additional differential equations, making the numerical solution of...

Application Briefs: Software
Geomagic Studio 3D scanning and processing software
Geomagic Inc.
Research Triangle Park, NC
800-691-1839
www.geomagic.com

Ceramic tiles...

Briefs: Physical Sciences
Hybrid-PIC Computer Simulation of the Plasma and Erosion Processes in Hall Thrusters

HPHall software simulates and tracks the time-dependent evolution of the plasma and erosion processes in the discharge chamber and near-field plume of Hall thrusters. HPHall is an axisymmetric solver that employs a hybrid fluid/ particle-in-cell (Hybrid-PIC)...

Application Briefs: Robotics, Automation & Control
Adept Viper 850 robot arm
Adept Technology
Pleasanton, CA
925-245-3400
www.adept.com

NASA’s Ames Research Center in Moffett Field, CA, performs research...

Briefs: Software

SYNGAS specializes in thermal and micro-thermal technology, and designs and analyzes pre-production heating, cooling, and thermal insulation systems for a...

Briefs: Software
SPOT Program

A Spacecraft Position Optimal Tracking (SPOT) program was developed to process Global Positioning System (GPS) data, sent via telemetry from a spacecraft, to generate accurate navigation estimates of the vehicle position and velocity (state vector) using a Kalman filter. This program uses the GPS onboard receiver measurements to...

Briefs: Software
Trajectory Optimization: OTIS 4

The latest release of the Optimal Trajectories by Implicit Simulation (OTIS4) allows users to simulate and optimize aerospace vehicle trajectories. With OTIS4, one can seamlessly generate optimal trajectories and parametric vehicle designs simultaneously. New features also allow OTIS4 to solve non-aerospace...

Articles: Software

In our annual poll of executives at leading design and virtual prototyping software companies, we found that in difficult economic times, providing...

Briefs: Physical Sciences

A special image-data-processing technique has been developed for use in experiments that involve observation, via optical microscopes equipped with electronic cameras, of moving...

Briefs: Mechanical & Fluid Systems
Deployable Shroud for the International X-Ray Observatory

A document describes the design of a lightweight (between 100 to 200 kg), light-tight shroud of about 3.9 meters in diameter that could be stowed into a very small volume, and be deployed to 12 meters. The shroud will consist of two concentric multi-layer blankets (MLIs) that are...

Briefs: Information Technology
Improved Model of a Mercury Ring Damper

A short document discusses the general problem of mathematical modeling of the three-dimensional rotational dynamics of rigid bodies and of the use of Euler parameters to eliminate the singularities occasioned by the use of Euler angles in such modeling. The document goes on to characterize a Hamiltonian...

Articles: Software
Changing Roles in a Challenging Environment

In our annual poll of executives at leading analysis and simulation software companies, we posed questions dealing with virtual prototyping, the...

Articles: Photonics/Optics

About 25% of space-borne electro-optical (EO) sensor programs in both the civil and National Security Space (NSS) communities have experienced reduced...