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Experimental and Numerical Investigations of the Early Flame Development Produced by a Corona Igniter

Università degli Studi di Perugia-Federico Ricci, Jacopo Zembi, Michele Battistoni, Carlo Grimaldi, Gabriele Discepoli, Luca Petrucci
Published 2019-10-07 by SAE International in United States
In order to reduce engine emissions and fuel consumption, extensive research efforts are being devoted to develop innovative ignition devices, able to extend the stable engine operating range towards increasing lean conditions. Among these, radio frequency corona ignition systems, which produce a strong electric field at a frequency of about 1 MHz, can create discharges characterized by simultaneous thermal and kinetic effects. These devices can considerably increase the early flame growth speed, initiating the combustion process in a wide region, as opposed to the local ignition generated by traditional sparks. To explore the corona ignition behavior, experimental campaigns were carried out to investigate different operating conditions, in a constant volume calorimeter designed to measure the deposited thermal energy. The present work compares the combustion development generated by a traditional spark and the corona igniter through computational fluid dynamics simulations. First, simulations are carried out to reproduce the experimental results in the calorimeter, comparing the measured and predicted pressure traces in an inert environment. The validated approach is then applied in a second step to the…
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Inline Optical Power Monitoring, Network End-to-End Data Link Evaluation System

AS-3 Fiber Optics and Applied Photonics Committee
  • Aerospace Standard
  • AIR6552/1
  • Current
Published 2019-10-02 by SAE International in United States
This document establishes methods to obtain, store, and access data about the health of a fiber optic network using commercially available inline optical power monitoring sensors. This document is intended for: Managers Engineers Technicians Contracting officers Third party maintenance agencies Quality assurance
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General Requirements for Powered Drive Units (PDUs) in Aircraft Cargo Systems

AGE-2 Air Cargo
  • Aerospace Standard
  • AIR4165B
  • Current
Published 2019-10-02 by SAE International in United States
This SAE Aerospace Information Report (AIR) is intended to assist the user (aircraft manufacturer/airline) in the following areas: a In the decision of whether or not to plan for the installation of a powered drive system in the cargo loading system (CLS) during the definition of the aircraft on-board cargo loading system. b If a powered drive system is decided upon, to provide general requirements to be considered during the preparation of component specifications for the powered drive units (PDUs) to be used. This provides a selection of criteria in order to obtain an optimum PDU for the application considered.
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Wireless Transceiver Quadruples Speed of 5G

  • Magazine Article
  • TBMG-35268
Published 2019-10-01 by Tech Briefs Media Group in United States

A new wireless transceiver was developed that boosts radio frequencies into 100-gigahertz territory, which is quadruple the speed of the upcoming 5G, or fifth-generation, wireless communications standard. The end-to-end transmitter-receiver is a 4.4-millimeter-square silicon chip capable of processing digital signals significantly faster and more energy-efficiently because of its digital-analog architecture. Having transmitters and receivers that can handle high-frequency data communications is vital for Internet of Things devices, autonomous vehicles, and vastly expanded broadband for streaming of high-definition video content and more.

Technique Locates Robots and Humans in GPS-Challenged Environments

  • Magazine Article
  • TBMG-35278
Published 2019-10-01 by Tech Briefs Media Group in United States

An algorithm enables localization of humans and robots in areas where GPS is unavailable. The Army needs to be able to localize agents operating in physically complex, unknown, and infrastructure-poor environments. This capability is critical to help find dismounted soldiers and for humans and robotic agents to team together effectively.

Solid-State Microwave Power Module

  • Magazine Article
  • TBMG-35350
Published 2019-10-01 by Tech Briefs Media Group in United States

Historically, the term microwave power module (MPM) has been associated with a small, fully integrated, self-contained radio frequency (RF) amplifier that combines both solid-state and microwave vacuum electronics technologies. Typically, the output power of these MPMs is on the order of about 100 Watts CW over an octave bandwidth. Because of their smaller size and lower mass compared to conventional traveling-wave tube amplifiers, these MPMs may have applications in electronic warfare systems.

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Solid-State Microwave Power Module

Aerospace & Defense Technology: October 2019

  • Magazine Article
  • 19AERP10_05
Published 2019-10-01 by SAE International in United States

Historically, the term microwave power module (MPM) has been associated with a small, fully integrated, self-contained radio frequency (RF) amplifier that combines both solid-state and microwave vacuum electronics technologies. Typically, the output power of these MPMs is on the order of about 100 Watts CW over an octave bandwidth. Because of their smaller size and lower mass compared to conventional traveling-wave tube amplifiers, these MPMs may have applications in electronic warfare systems.

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Shape-Shifting Origami Could Help Antenna Systems Adapt On-the-Fly

Aerospace & Defense Technology: September 2019

  • Magazine Article
  • 19AERP09_05
Published 2019-09-01 by SAE International in United States

Conventional reconfigurable electrical and radio frequency (RF) structures commonly used in applications involving real-time reconfigurability in response to fast varying operational scenarios require specialized substrates or complex electrical circuits. Origami-based RF reconfigurable components and modules offer a solution with unique properties. First, they enable reconfigurability over continuous-state ranges (as opposed to discrete states). Second, they do not require specialized mechanical support for multilayer frequency-selective surface structures. Moreover, deployable origami-based RF structures can achieve large surface reconfigurability ratios from folded to unfolded states. Finally, these structures allow for independent control of multiple figures of merit: bandwidth, frequency of operation, and angle of incidence.

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Shape-Shifting Origami Could Help Antenna Systems Adapt On-the-Fly

  • Magazine Article
  • TBMG-35107
Published 2019-09-01 by Tech Briefs Media Group in United States

Conventional reconfigurable electrical and radio frequency (RF) structures commonly used in applications involving real-time reconfigurability in response to fast varying operational scenarios require specialized substrates or complex electrical circuits. Origami-based RF reconfigurable components and modules offer a solution with unique properties. First, they enable re-configurability over continuous-state ranges (as opposed to discrete states). Second, they do not require specialized mechanical support for multilayer frequency-selective surface structures. Moreover, deployable origami-based RF structures can achieve large surface re-configurability ratios from folded to unfolded states. Finally, these structures allow for independent control of multiple figures of merit: bandwidth, frequency of operation, and angle of incidence.

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Multi-Agent RF Propagation Simulator

Aerospace & Defense Technology: June 2019

  • Magazine Article
  • 19AERP06_07
Published 2019-06-01 by SAE International in United States

Adesirable interface between multiagents is through over-the-air RF connections that include not only the intended direct RF communications paths but also highly variable multiray propagation, range attenuation, external RF influences, and near-earth influence. These influences are all difficult to predict, control, and repeat in an outdoor environment. This outdoor testing, as has traditionally been done, is extremely expensive while simultaneously providing fewer data points than more controlled events and the testing events are generally not repeatable.

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