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Design and Experiment on Aircraft Electromechanical Actuator Fan at Different Altitudes and Rotational Speeds

Air Force Research Laboratory, USA-Q.H. Leland
North Carolina A&T State University, USA-E. Gyasi, J.P. Kizito
  • Journal Article
  • 01-12-01-0003
Published 2019-06-07 by SAE International in United States
For electromechanical actuators (EMAs) and electronic devices cooling on aircraft, there is a need to study cooling fan performance at various altitudes from sea level to 12,000 m where the ambient pressure varies from 1 to 0.2 atm. As fan static pressure head is proportional to air density, the fan’s rotational speed has to be increased significantly to compensate for the low ambient pressure of 0.2 atm at the altitude of 12,000 m. To evaluate fan performance for EMA cooling, a high-rotational-speed, commercially available fan made by Ametek with a diameter of ~82 mm and ~3 m3/min zero-load open cooling flow rate when operating at 20,000 rpm was chosen as the baseline. According to fan scaling laws, this fan was expected to meet the cooling needs for an EMA when operating at 0.2 atm. Using a closed flow loop, the performance of the fan operating in the above ambient pressure range and at a rotational speed between 15,000 and 30,000 rpm was evaluated. Unexpectedly, at 0.2 atm, the Ametek fan was able to produce only…
 

Transparent, Self-Healing Electronic Skin

  • Magazine Article
  • TBMG-34411
Published 2019-05-01 by Tech Briefs Media Group in United States

Scientists have taken inspiration from underwater invertebrates like jellyfish to create an electronic skin with similar functionality. Like a jellyfish, the electronic skin is transparent, stretchable, touch-sensitive, and self-healing in aquatic environments.

 

Enabling Efficient Functional Safety Audits - The Missing Link between ISO 26262 and Automotive SPICE

Dyson Technology Ltd.-Ireri Ibarra
Volvo Group-Per Johannessen
Published 2019-04-02 by SAE International in United States
In the field of electric and electronic (E/E) design for the automotive industry, there are separate traditions related to functional safety and software quality assurance. Both relying on the evaluation of the processes used; Automotive SPICE provides detailed guidance on how to perform this evaluation whilst ISO 26262 does not and simply mention Automotive SPICE as one possible solution. ISO 26262 additionally requires for an evaluation of the functional safety achieved by the product and uses the process evaluation (or functional safety audit in ISO 26262 terms) to support the final functional safety assessment. The purpose is to evaluate the implementation of the necessary safety processes according to the claimed scope defined in the safety plan.Automotive SPICE does not make a distinction on whether the application of the software under evaluation is safety related or not. ISO 26262 requires formal functional safety audits as a minimum for the part of the life cycle activities related to elements having ASIL C and ASIL D requirementsIn this paper we show how the link between ISO 26262 and…
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AS5553B, Counterfeit Electrical, Electronic and Electromechanical (EEE) Parts; Avoidance, Detection, Mitigation, and Disposition Verification Criteria

G-19C Standards Compliance Verification
  • Aerospace Standard
  • AS6462B
  • Current
Published 2019-03-26 by SAE International in United States
This set of criteria can be utilized to assess compliance to AS5553B, Aerospace Standard Counterfeit Electrical, Electronic and Electromechanical (EEE) Parts; Avoidance, Detection, Mitigation, and Disposition.
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The Heat Is On: A Guide to Specifying Insulation Materials

  • Magazine Article
  • TBMG-33919
Published 2019-03-01 by Tech Briefs Media Group in United States

One of the first things an electrical engineer will learn is that the number-one enemy of designing and manufacturing any electrical/electronic product is heat. It's the one characteristic that can cause your idea of a hand-sized unit to turn into a tabletop unit. When discussing insulation with a manufacturer, the first question that seems to come up is temperature resistance. It is a very important characteristic but there are a few others that need to be addressed as well. In addition to temperature rating, voltage along with mechanical strength play a very important role in the selection of insulation.

 

Electronics Withstand Extreme Heat

  • Magazine Article
  • TBMG-33938
Published 2019-03-01 by Tech Briefs Media Group in United States

Most electronics only function within a certain temperature range but blending two organic materials together creates electronics that withstand extreme heat. The new plastic material could reliably conduct electricity up to 220 °C (428 °F).

 

New V8, big towing, trick features and tech for 2020 Chevy Silverado HD

Automotive Engineering: March 2019

Bill Visnic
  • Magazine Article
  • 19AUTP03_15
Published 2019-03-01 by SAE International in United States

With pickup trucks seemingly taking over the personal-vehicle market, it's no surprise the Detroit Three automakers are devoting more attention than ever to the pickups-for-real-work side of the equation, too. In launching the 2020 Chevrolet Silverado HD line at a high-profile event at the trucks' newly-expanded assembly plant in Flint, Michigan, General Motors president Mark Reuss said, “At GM, we've been preparing for this changing market for years.”

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Process for Assessment and Mitigation of Early Wearout of Life-Limited Microcircuits

APMC Avionics Process Management
  • Aerospace Standard
  • ARP6338A
  • Current
Published 2019-02-08 by SAE International in United States
This document is intended for use by designers, reliability engineers, and others associated with the design, production, and support of electronic sub-assemblies, assemblies, and equipment used in AADHP applications to conduct lifetime assessments of microcircuits with the potential for early wearout; and to implement mitigations when required; and by the users of the AADHP equipment to assess those designs and mitigations. This document focuses on the LLM wearout assessment process. It acknowledges that the AADHP system design process also includes related risk mitigation and management; however, this document includes only high-level reference and discussion of those topics, in order to show their relationship to the LLM assessment process.
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An Introduction to PCM Heat Sinks

Aerospace & Defense Technology: February 2019

  • Magazine Article
  • 19AERP02_02
Published 2019-02-01 by SAE International in United States

With the exception of thermal storage heat sinks, the term heat sink is a misnomer. Standard heat sinks for electronics cooling are actually heat exchangers, taking the heat from the electronics, and transferring it to a fluid, either air or coolant. Phase Change Material (PCM) heat sinks are the only heat sinks that actually act as a (temporary) sink for heat. They are emerging in the thermal management realm to solve thermal problems in systems where active solutions cannot be used. When there is no place to dissipate the heat generated by electric components, a PCM heat sink is capable of absorbing the generated waste heat [1].

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Novel Characterization Methods for Anisotropic and Mixed-Conduction Materials

  • Magazine Article
  • TBMG-33771
Published 2019-02-01 by Tech Briefs Media Group in United States

State-of-the-art electronic and optoelectronic devices require electronic materials with specialized properties that cannot be characterized with standard methods, or that must be characterized with extra precision. As a result of this research, the following new materials characterization methods have been developed: