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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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Aerospace & Defense Technology: October 2019

  • Magazine Issue
  • 19AERP10
Published 2019-09-26 by SAE International in United States
Artificial Intelligence and Autonomous VehiclesA "STEP" Forward for Product Lifecycle ManagementThe Challenge of Replacing Hard ChromeDefining an Open System Architecture Standard for Defense SystemsSolid-State Microwave Power ModuleDefeating Commercial Drone Threats with Open-Source SDRInfluence of Leading-Edge Oscillatory Blowing on Time-Accurate Dynamic Store Separation Developing an understanding of, and potentially controlling, pitch bifurcation of a store release from an aircraft during flight could improve weapons delivery.Green's Function Extraction from Atmospheric Acoustic Propagation Understanding what affects acoustic waves propagating in the atmosphere is important for a variety of military applications including the development of new remote sensing techniques.Waveform Synthesis for Shock Response Spectrum Replication, Applied to Ground Vehicle Component Testing Improved test methods will help alleviate the impact of shock levels on military and commercial ground vehicle components.SnowMicroPenetrometer Applications for Winter Vehicle Mobility Characterizing the mechanical properties of snow and their impact on vehicle performance could improve vehicle winter mobility modeling.Engineered Resilient Systems A new application called TradeAnalyzer provides multiple visualization methods to examine, sort, and filter the attributes of data.
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Data Recorder and Mission Computer

  • Magazine Article
  • TBMG-35112
Published 2019-09-01 by Tech Briefs Media Group in United States

Curtiss-Wright Corporation Ashburn, VA 703-779-7800

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Ultra-Light Rocket Launchers

  • Magazine Article
  • TBMG-35110
Published 2019-09-01 by Tech Briefs Media Group in United States

Arnold Defense Arnold, MO 636-296-5417

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Air Cycle Air Conditioning Systems for Air Vehicles

AC-9 Aircraft Environmental Systems Committee
  • Aerospace Standard
  • AS4073B
  • Current
Published 2019-08-20 by SAE International in United States

This SAE Aerospace Standard (AS) defines the requirements for air cycle air conditioning systems used on military air vehicles for cooling, heating, ventilation, and moisture and contamination control. General recommendations for an air conditioning system, which may include an air cycle system as a cooling source, are included in MIL-E-18927E and JSSG-2009.

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Hybrid Ultra-Low VOC and Non-HAP Rain Erosion Coatings

Aerospace & Defense Technology: August 2019

  • Magazine Article
  • 19AERP08_12
Published 2019-08-01 by SAE International in United States

Developing a rapid-curing rain erosion coating based on a unique glycidyl carbamate (GC) hybrid resin chemistry that offers rapid reactivity and adhesion combined with the erosion, flexibility, weathering and mechanical properties of polyurethane systems.

Numerous military aircraft and shipboard surfaces, such as radomes, antennas, gun shields, wing leading edges, and helicopter blade leading edges, are coated with a specialized erosion-resistant protective coating possessing strict performance requirements. These protective coatings must provide excellent rain erosion resistance, superior mechanical properties, good adhesion to the substrate and meet a host of other metrics outlined in MIL-PRF-32239 and SAE AMS-C- 83231A.

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Hybrid Ultra-Low VOC and Non-HAP Rain Erosion Coatings

  • Magazine Article
  • TBMG-34877
Published 2019-08-01 by Tech Briefs Media Group in United States

Numerous military aircraft and shipboard surfaces, such as radomes, antennas, gun shields, wing leading edges, and helicopter blade leading edges, are coated with a specialized erosion-resistant protective coating possessing strict performance requirements. These protective coatings must provide excellent rain erosion resistance, superior mechanical properties, good adhesion to the substrate and meet a host of other metrics outlined in MIL-PRF-32239 and SAE AMS-C- 83231A.

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Pathfinder Radar ISR and SAR Systems: Tactical Eyes for the Warfighter

Aerospace & Defense Technology: August 2019

  • Magazine Article
  • 19AERP08_06
Published 2019-08-01 by SAE International in United States

Sandia National Laboratories' (Albuquerque, NM) Radar Intelligence, Surveillance and Reconnaissance (ISR) systems enable a new product paradigm in radar capabilities and modalities. With the ability to shrink sensor size, increase resolution, raise image quality, and advance real-time onboard processing, Sandia has been producing next-generation systems for nearly three decades. Sandia specializes in the full system design of Synthetic Aperture Radar (SAR), Ground Moving Target Indicator (GMTI), target recognition, and other sensor systems for the Department of Defense, other government agencies, and industry partners.

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Electromechanical Actuators Specification Guide

A-6B3 Electro-Mechanical Actuation Committee
  • Aerospace Standard
  • ARP5754
  • Current
Published 2019-06-10 by SAE International in United States
This Aerospace Recommended Practice (ARP) provides general characteristics, requirements, and design data to be recommended for inclusion in a procurement technical specification of an electromechanical actuator (EMA), including its control and monitoring.
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Modified USAF T-1A Aircraft

  • Magazine Article
  • TBMG-34538
Published 2019-06-01 by Tech Briefs Media Group in United States

Field Aerospace Oklahoma City, OK 405-219-3400