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Application of Extended Messinger Icing Models to Complex Airframe Geometries

Georgia Institute of Technology-Avani Gupta, Lakshmi Sankar
NASA John Glenn Research Center-Richard Kreeger
  • Technical Paper
  • 2020-01-0022
To be published on 2020-03-10 by SAE International in United States
Ice accretion poses a major problem for civilian and military aircraft and rotorcraft, severely jeopardizing the safety and survivability of the vehicle. The development of analytical and empirical ice tools to understand the ice accretion process is crucial. Existing methodologies, such as the Messinger model employed by LEWICE, are able to predict ice shapes and growth on lifting surfaces such as wings and rotors relatively well. Extension of these methodologies to more complex configurations is needed. The methodology must be reasonably modular so that one can leverage future developments in computational fluid dynamics, structured and unstructured grid generation, and ice accretion models. Towards this goal, the following modular approach has been developed. 1. Do the unstructured grid based flow analysis. Save the grid and flow field in a standard format such as Plot3D or VGrid. 2. Compute the water particle transport using either the Lagrangian approach or an Eulerian approach. Where possible, public domain analyses, e.g. OpenFoam, are used in this step. 3. Compute the time rate at which water is deposited on the solid…

Technology Impact Forecasting for Multi-Functional Composites

  • Magazine Article
  • TBMG-35679
Published 2019-12-01 by Tech Briefs Media Group in United States

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.

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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.

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Paint System, Fluorescent, Removable, for Aircraft Application

AMS G8 Aerospace Organic Coatings Committee
  • Aerospace Material Specification
  • AMSP21600B
  • Current
Published 2019-10-28 by SAE International in United States
This specification establishes the requirements for a high visibility, durable, exterior fluorescent coating system consisting of a pigmented fluorescent coating with a clear protective overcoat containing a weathering stabilizer. This coating system is capable of being removed without softening the permanent undercoats.
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Minimum Operational and Maintenance Responsibilities for Aircraft Tire Usage

A-5C Aircraft Tires Committee
  • Aerospace Standard
  • ARP5265B
  • Current
Published 2019-10-17 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) sets forth criteria for the installation, inflation, inspection, and maintenance of aircraft tires as well as criteria for the maintenance of the operating environment so as to achieve the purpose stated in 1.1. (Definitions of terms related to aircraft tires are found in 2.2.)
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In-Service Reliability Data of Continuously Active Ball Screw and Geared Flight Control Actuation Systems

A-6B3 Electro-Mechanical Actuation Committee
  • Aerospace Standard
  • AIR5713A
  • Current
Published 2019-10-14 by SAE International in United States
This Aerospace Information Report (AIR) has been written to provide in-service reliability data of continuously active ball screw and geared flight control actuation systems.
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Method for Predicting Lateral Attenuation of Airplane Noise

A-21 Aircraft Noise Measurement Aviation Emission Modeling
  • Aerospace Standard
  • AIR5662
  • Current
Published 2019-10-04 by SAE International in United States
This document describes analytical methods for calculating the attenuation of the level of the sound propagating from an airplane to locations on the ground and to the side of the flight path of an airplane during ground roll, climbout after liftoff, and landing operations. Both level and non-level ground scenarios may be modeled using these methods, however application is only directly applicable to terrain without significant undulations, which may cause multiple reflections and/or multiple shielding effects. This attenuation is termed lateral attenuation and is in excess of the attenuation from wave divergence and atmospheric absorption. The methods for calculating the lateral attenuation of the sound apply to: turbofan-powered transport-category airplanes with engines mounted at the rear of the fuselage (on the sides of the fuselage or in the center of the fuselage as well as on the sides) or under the wings propeller-driven transport-category or general-aviation airplanes propagation over ground surfaces that may be considered to be “acoustically soft” such as lawn or field grass situations where the terrain to the sides of the flight…
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Drone Control System

  • Magazine Article
  • TBMG-35357
Published 2019-10-01 by Tech Briefs Media Group in United States

Kongsberg Geospatial Ottawa, Ontario, Canada 1-800-267-7330

Artificial Intelligence and Autonomous Vehicles

  • Magazine Article
  • TBMG-35360
Published 2019-10-01 by Tech Briefs Media Group in United States

The use of artificial intelligence (AI) based machine learning technologies in autonomous vehicles is on the rise. Helping to drive this trend is the availability of a new class of embedded AI processors. A good example is NVIDIA’s Jetson family, which includes small form factor system on modules (SoMs) that provide GPU-accelerated parallel processing. These high-performance, low-power devices are designed to support the deep learning and computer vision capabilities needed to build software-defined autonomous machines. They derive massive computing capabilities from the use of a parallel processing GPU device with many cores, enabling next-gen computing devices to take on many of the tasks that were historically handled by humans or multiple, traditional computers.

Influence of Leading-Edge Oscillatory Blowing on Time-Accurate Dynamic Store Separation

  • Magazine Article
  • TBMG-35362
Published 2019-10-01 by Tech Briefs Media Group in United States

Increasing the operational efficiency of weapons employed in hostile environments is a high priority of the United States Air Force (USAF). In recent history, the USAF has made a move to smaller and internally stored weapons, especially for fighter aircraft. Maintaining a low radar cross section signature, and thus a low observable air vehicle, is desirable so the aircraft is less detectable by the enemy.