Keyword: Analysis methodologies

Briefs: Manufacturing & Prototyping

A shape reminiscent of a dog bone has been found to be superior to other shapes for mechanical-amplification horns that are components of piezoelectrically driven actuators used in...

Application Briefs: Imaging

As thin-film technology advances, it’s increasingly important to monitor the film’s characteristics. That’s because eliminating irregularities in thin films — used...

Briefs: Information Technology

Proper orthogonal decomposition (POD) is the mathematical basis of a method of constructing low-order mathematical models for the "gray-box" fault- detection algorithm that is a component...

Who's Who: Sensors/Data Acquisition

The Inductive Monitoring System (IMS) is a new computer program that monitors gyroscopes that keep the International Space Station properly oriented in space....

Articles: Photonics/Optics

Companies that manufacture products ultimately used by consumers — interior trim for cars, vinyl siding for homes, decorative stone for landscaping, interior wall paints,...

Briefs: Software
Programs for Testing an SSME-Monitoring System

A suite of computer programs has been developed for special test equipment (STE) that is used in verification testing of the Health Management Computer Integrated Rack Assembly (HMC-IRA), a ground- based system of analog and digital electronic hardware and software for "flight-like" testing for...

Briefs: Software

Radiant Energy Display and Analysis Software Package (REDAP) is a computer program for processing antenna-radiation- pattern data that have been preprocessed by a data-collection program...

Briefs: Software
Analyzing Responses of Chemical Sensor Arrays

NASA is developing a third-generation electronic nose (ENose) capable of continuous monitoring of the International Space Station's cabin atmosphere for specific, harmful airborne contaminants. Previous generations of the ENose have been described in prior NASA Tech Briefs issues.

Briefs: Software
Displaying Properties of PDFs

PDFVis is a computer program that assists in visualization of uncertainty as represented by a probability density function (PDF) located at each grid cell in a spatial domain. PDFVis performs the following functions:

Briefs: Software
Modular Filter and Source-Management Upgrade of RADAC

In an upgrade of the Range Data Acquisition Computer (RADAC) software, a modular software object library was developed to implement required functionality for filtering of flight-vehicle- tracking data and management of tracking-data sources. (The RADAC software is used to process...

Briefs: Information Technology
Two Algorithms for Processing Electronic Nose Data

Two algorithms for processing the digitized readings of electronic noses, and computer programs to implement the algorithms, have been devised in a continuing effort to increase the utility of electronic noses as means of identifying airborne compounds and measuring their concentrations. One...

Briefs: Mechanical & Fluid Systems

During a vehicle's braking action, a wheel's kinetic energy is transformed into heat, which doesn't dissipate fast enough into the air stream from the brake...

Briefs: Software
Better Finite-Element Analysis of Composite Shell Structures

A computer program implements a finite-element-based method of predicting the deformations of thin aerospace structures made of isotropic materials or anisotropic fiber-reinforced composite materials. The technique and corresponding software are applicable to thin shell structures in...

Briefs: Software
Rover Graphical Simulator

Rover Graphical Simulator (RGS) is a package of software that generates images of the motion of a wheeled robotic exploratory vehicle (rover) across terrain that includes obstacles and regions of varying traversability. The simulated rover moves autonomously, utilizing reasoning and decision-making capabilities of a...

Briefs: Physical Sciences

An improved statistical model has been developed to describe the chemical composition of an evaporating multicomponent- liquid drop and of the mixture of gases surrounding the drop....

Briefs: Materials
Accounting for Uncertainties in Strengths of SiC MEMS Parts

A methodology has been devised for accounting for uncertainties in the strengths of silicon carbide structural components of microelectromechanical systems (MEMS). The methodology enables prediction of the probabilistic strengths of complexly shaped MEMS parts using data from tests of...

Briefs: Mechanical & Fluid Systems

A streamliner motorcycle designed and built by Sierra Design Engineering and BUB Enterprises achieved a new world-record speed of 350.884 miles per hour last year at the Bonneville...

Briefs: Materials

The Micromechanics Analysis Code with Generalized Method of Cells (MAC/GMC) is core technology in a software suite called ImMAC, developed at NASA's John Glenn Research...

Briefs: Software
Reducing a Knowledge-Base Search Space When Data Are Missing

This software addresses the problem of how to efficiently execute a knowledge base in the presence of missing data. Computationally, this is an exponentially expensive operation that without heuristics generates a search space of 1 + 2n possible scenarios, where n is the...

Briefs: Mechanical & Fluid Systems
Estimation Filter for Alignment of the Spitzer Space Telescope

A document presents a summary of an onboard estimation algorithm now being used to calibrate the alignment of the Spitzer Space Telescope (formerly known as the Space Infrared Telescope Facility). The algorithm, denoted the S2P calibration filter, recursively generates estimates of...

Briefs: Electronics & Computers
Hybrid Mobile Communication Networks for Planetary Exploration

A paper discusses the continuing work of the Mobile Exploration System Project, which has been performing studies toward the design of hybrid communication networks for future exploratory missions to remote planets. A typical network could include stationary radio transceivers on a...

Application Briefs: Motion Control

Hard disks were originally intended for computers in ultra-clean, ultra-safe data offices; by the 21st century, hard disks had moved beyond the office, finding their way into digital...

Briefs: Electronics & Computers

Since 9/11, we are increasingly threatened by terrorist plots — the release of noxious substances into crowded public places or on airplanes, in crowded...

Articles: Electronics & Computers

By now, most test engineers have recognized that both HALT (Highly Accelerated Life Testing) and HASS (Highly Accelerated Stress Screening) are the fastest and most effective...

Application Briefs: Electronics & Computers

High-integrity software plays critical roles in telecommunications, transportation, defense systems, industrial automation, and power management. Because human lives may be lost and...

Briefs: Mechanical & Fluid Systems

system for real-time detection of surface- fatigue-pitting damage to gears for use in a helicopter transmission is based on fuzzy-logic used to fuse data from sensors that measure...

Briefs: Mechanical & Fluid Systems

Atomic Energy of Canada, Ltd., a subcontractor of Societatea Nationala Nucleoelectrica S.A. (SNN) of Romania, contracted Badger Meter to model, test, and produce a set of precision...

Who's Who: Software

Searching for defects amid several thousand lines of code in mission critical software, NASA’s Independent Verification and Validating...

Briefs: Software

MarsLS is a software tool for analyzing statistical dispersion of spacecraft-landing sites and displaying the results of its analyses. Originally intended for the Mars Explorer Rover...