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SAE Truck & Off-Highway Engineering: October 2022

2022-10-06
eAxles gain traction OEMs are developing and testing axles with integrated electric powertrains to electrify trucks of all sizes. Securing CAN networks in commercial vehicles A CAN transceiver with built-in security functions can avoid the complexity of end-to-end security solutions that are especially hard to implement on CVs. Electrification is the future for defense vehicles Despite infrastructure challenges, electrified and automated military vehicles will save fuel and lives, said Allison's VP of Defense Programs at SAE COMVEC 2022. Editorial Hiring talent to meet high-tech demands Allison's now open for hydrogen testing Electrification's impact on commercial-vehicle chassis design Harbinger prepares to enter commercial market with novel eAxle ZF, Freudenberg developing integrated 'Powerpack' fuel cell and e-drive Freightliner's medium-duty makeover for M2 and SD models Toyota's hydrogen fuel-cell powertrain provides an electrifying ride
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Unique Wheel and Brake Designs

2022-09-08
CURRENT
AIR5388
This SAE Aerospace Information Report (AIR) has been prepared by a panel of the SAE A-5A Committee and is presented to document unique design approaches used for aircraft wheels and brakes.
Magazine

Aerospace & Defense Technology: April 2021

2021-04-01
Developing a 6DoF Aircraft Munitions Optical Tracking System Plasma Nitride Surface Hardening of Titanium for Aerospace and Armament Applications The Future of Aircraft Electrification Shielding Aerospace Systems from Electromagnetic Interference Improving Transmit/Receive Module Test Accuracy and Throughput Army Detects Broadest Frequencies Ever with Quantum Receiver A Comparative Evaluation of the Detection and Tracking Capability Between Novel Event-Based and Conventional Frame-Based Sensors This research establishes a fundamental understanding of the characteristics of event-based sensors and applies it to the development of a detection and tracking algorithm. Sensory Integration Balance Deficits in Complex mTBI: Can Early Initiation of Rehabilitation with Wearable Sensor Technology Improve Outcomes?
Article

Space launch providers submit proposals for National Security Space Launch program

2019-08-16
Four companies – Blue Origin, Northrop Grumman Innovation Systems, SpaceX, and United Launch Alliance (ULA) – recently submitted proposals for the U.S. Air Force's Phase 2 Launch Services Procurement (LSP) competition. Two of those companies will be awarded with up to 34 launches over a five-year period under the National Security Space Launch (NSSL) program.
Article

Nissan and EVgo partner to build 200 new EV fast chargers in the U.S.

2019-08-08
Nissan Motor Co., Ltd. and EVgo Services LLC. are placing 200 direct current fast chargers (DCFC) across the United States to increase the number of available charging stations for electric vehicles (EVs). The fast chargers are capable of delivering 100 kilowatts of power and have both CHAdeMO and CCS connectors to facilitate a wider variety of EVs.
Article

Electrify America wants an emoji for electric vehicles

2019-07-19
With about 230 new emoji characters added to major communication platforms in 2019, Electrify America wants to make sure EVs and the company’s ultra-fast charging stations are represented in the modern visual vernacular.
Article

Made In Space is set to make in space

2019-07-17
Once in orbit, Archinaut One will use additive manufacturing techniques – or 3D printing – to create two 32-foot beams extending out from each side of the spacecraft. As manufacturing progresses, each beam will unfurl two solar arrays that generate up to five times more power than traditional solar panels on spacecraft of similar size.
Article

Orion launch abort system passes full-stress flight test

2019-07-09
The system is designed to lift the crew module off the launch vehicle’s engine stack in case of an emergency and steer it away from danger. According to NASA coverage, engineers have confirmed that the LAS can “outrun a speeding rocket.”
Article

Dragonfly will be NASA’s next solar system explorer

2019-06-28
Dragonfly, which might be called a rotorcraft lander, is under development by the Johns Hopkins University Applied Physics Laboratory and has the appearance of an Earth-bound vertical take-off and landing (VTOL) unmanned aircraft system (UAS) or drone.
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Thermodynamics of Incompressible and Compressible Fluid Flow

2019-04-11
CURRENT
AIR1168/1A
The fluid flow treated in this section is isothermal, subsonic, and incompressible. The effects of heat addition, work on the fluid, variation in sonic velocity, and changes in elevation are neglected. An incompressible fluid is one in which a change in pressure causes no resulting change in fluid density. The assumption that liquids are incompressible introduces no appreciable error in calculations, but the assumption that a gas is incompressible introduces an error of a magnitude that is dependent on the fluid velocity and on the loss coefficient of the particular duct section or piece of equipment. Fig. 1A-1 shows the error in pressure drop resulting from assuming that air is incompressible. With reasonably small loss coefficients and the accuracy that is usually required in most calculations, compressible fluids may be treated as incompressible for velocities less than Mach 0.2.
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