Your Selections

Aerospace & Defense Technology
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Magazine

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Tips for Reducing Error When Using Eddy Current Measuring Techniques

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_02
Published 2019-12-01 by SAE International in United States

Inductive eddy current technology is an extremely versatile non-contact method for measuring an object's position, distance, or vibration. Unaffected by environmental contaminants or target finish characteristics, these sensors can operate in a vacuum or in fluids, so they work well for dirty applications, like those with oil or dust present. To get the most out of eddy current sensors, follow these tips for reducing errors that can affect a measurement's accuracy.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Streamlining Post-Processing in Additive Manufacturing

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_04
Published 2019-12-01 by SAE International in United States

Undoubtedly there are many benefits associated with the use of additive manufacturing (AM) as a production technology. On a pan-industrial basis, manufacturers exploit the fact that through the use of AM they can not only build complex parts, in one piece, which were previously impossible, but they can also build stronger, lighter-weight parts, reduce material consumption, and benefit from assembly component consolidation across a range of applications. These advantages have all been well documented during the last 10-20 years as AM has emerged as a truly disruptive technology for prototyping and production, and are invariably seen as being enabled by the additive hardware that builds the parts. In reality, however, this is a partial picture, particularly for serial production applications of AM. AM hardware systems are actually just one part - albeit a vital part - of an extensive ecosystem of technologies that enable AM, both pre- and post-build.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

SDR Interface for the NeXtRAD Multistatic Radar System

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_06
Published 2019-12-01 by SAE International in United States

NeXtRAD is a dual-band, dual-polarization, multistatic radar system under development at the University of Cape Town (UCT) in col lab oration with University College London (UCL). The primary mission of the system is to collect multistatic data of small radar cross-section maritime targets embedded in sea clutter.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Molecular Engineering for Mechanically Resilient and Stretchable Electronic Polymers and Composites

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_10
Published 2019-12-01 by SAE International in United States

Establishing the design criteria for elasticity and ductility in conjugated polymers and composites by analysis of the structural determinants of the mechanical properties.

The ability to predict the mechanical properties of organic semiconductors is of critical importance for roll-to-roll production and thermomechanical reliability of organic electronic devices. This research describes the use of coarse-grained molecular dynamics simulations to predict the density, tensile modulus, Poisson ratio, and glass transition temperature for poly(3-hexylthiophene) (P3HT) and its blend with C60. In particular, it is shown that the resolution of the coarse-grained model has a strong effect on the predicted properties.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Sensing Applied Load and Damage Effects in Composites with Nondestructive Techniques

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_08
Published 2019-12-01 by SAE International in United States

Comparing and correlating piezoelectrically induced guided waves, acoustic emission, thermography, and X-ray imaging to determine the effects of applied load on a composite structure.

Composite materials are desirable for aeronautical and aerospace applications for many reasons including their high strength-to-weight ratios, fatigue and corrosion resistance, design adaptability, and performance capabilities in harsh environments. Because of these qualities, composites are useful in many applications such as in armor, helmets, and helicopters, and as structural components.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Reducing the High Cost Of Titanium

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_03
Published 2019-12-01 by SAE International in United States

Titanium is neither a precious metal nor rare, yet among industrial metals it has the reputation for being very expensive. It's the fourth most abundant metallic element and the ninth most abundant of all the elements in the earth's crust. Its commercially useful oxide ore occurs in the minerals rutile and ilmenite and numerous iron ores, and exploitable ore deposits are liberally scattered around the world in Australia, Canada, India, Malaysia, Norway, Russia, South Africa and the U.S. But due to its properties and high cost it has often been referred to as unobtanium.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Software-Defined Analog Filters: A Paradigm Shift in Radio Filter Performance and Capability

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_05
Published 2019-12-01 by SAE International in United States

Among the most abundant components in all wireless system designs, analog RF filters are used to block interference from various internal and external sources. Limited spectrum divided among an ever-increasing number of users is further driving the need for these ubiquitous but in some ways anachronistic devices. Currently, interference is quite common among cellular base stations, satellite systems, radar installations, and other types of access and backhaul communications systems. Traditional filters are unable to cope with the requirements; in many cases, most often due to insufficient guard bandf. For example, in some international locales, LTE base stations and satellite receivers share the L-band frequencies. At around 3.5 GHz, 5G operators, CBRS radios, and military radars are trying to co-exist. To address this in-band interference, a new, tunable filtering technology is entering the marketplace, uniquely blending the best of both analog and digital technologies.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Technology Impact Forecasting for Multi-Functional Composites

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_09
Published 2019-12-01 by SAE International in United States

Multi-functional composites offer a possible solution to the conflicting design goals of making new aircraft lighter, stronger, faster, and more environmentally sustainable.

To survive within today's stringent economic environment, aircraft design, particularly military aircraft design, has been experiencing a paradigm shift from an emphasis on design for optimum performance to design for system effectiveness. As a consequence, designers and manufacturers are increasingly considering the addition of new technologies to aircraft design to reduce their cost, increase their operating capacities, and optimize new capabilities.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Electrodeposition of Metal Matrix Composites and Materials Characterization for Thin-Film Solar Cells

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_07
Published 2019-12-01 by SAE International in United States

Metal matrix composites, which consist of silver-multiwalled carbon nanotube-silver, layer-by-layer stacks, can electrically bridge the cracks (>40 μm) that appear in semiconductor substrates and the composite grid lines.

The current trend in both space and terrestrial photovoltaics is to implement high-efficiency, thin-film-based solar cells to reduce weight and materials cost while improving performance. For space photovoltaics, multi-junction (MJ) solar cells have been used almost exclusively due to their high efficiency and high radiation hardness. The efficiency of state-of-practice triple-junction (TJ) cells used in space today is approximately 30% under 1-sun Air Mass 0 (AM0) spectrum.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

A “STEP” Forward for Product Lifecycle Management

Aerospace & Defense Technology: October 2019

  • Magazine Article
  • 19AERP10_02
Published 2019-10-01 by SAE International in United States

The existence of countless proprietary file formats and the exchange of 3D CAD data has been a significant problem since the beginning of 3D CAD modeling. CAD applications and methods using digital data are constantly changing, which predicates the need for a solution to share validated and accurately translated data. Thus the birth of STEP242.

Annotation ability available