Aurora Flight Sciences Corp. has applied knowledge gained in developing full-authority digital engine controls (FADEC) for the company's Perseus unmanned aerial vehicle to create what is said to be the first all-digital single-lever power control (SLPC) for general aviation. Unlike the single gas pedal in a car, current piston engine aircraft have three controls to govern air speed: one for the throttle, one for the fuel-to air mixture, and one for propeller pitch control. An SLPC integrates a FADEC with a single power lever interface, greatly simplifying the pilot's job while simultaneously improving engine efficiency, decreasing emissions, and even extending engine life. "The SLPC increases safety and decreases pilot workload," says Benjamin Russ, SLPC project manager. "In a single-engine aircraft, our test pilot estimates that it cuts his workload by about 50%." The single-lever power command input is interpreted into optimal engine speed and inlet manifold pressure commands for the given flight condition. These commands are met by the real-time control laws running on the FADEC. As with the electronic engine-management system found on most new automobiles, the FADEC processes numerous engine parameters such as manifold air pressure, engine speed, cylinder head temperature, oil temperature, exhaust gas temperature, flight speed, and altitude to determine the best engine settings for a given power lever setting. "The pilot sets the power lever to a relative value--say half power--and the system determines the best way to develop half power given the current conditions," says Russ. Given today's sensor and processing technology--and Aurora's system leverages many automotive components--the SLPC seems like a straightforward product. However, safety is a paramount concern, and engineers have initially had to find ways to integrate the SLPC into the Cessna O-2A test aircraft without disabling the conventional mechanical fuel injection and magneto spark system. The result is player-piano like, with the manual engine-control levers moving in harmony to the SLPC's commands. OEM installations would probably be more elegant but still retain a mechanical backup for limping home.
Sharon Glotzer and David Pine are hoping to create the first liquid hard drive with liquid nanoparticles that can store 1TB per teaspoon. They aren't the first to find potential data stores, as Harvard researchers have stored 700 TB inside a gram of DNA.
If you see a hitchhiker along the road in Canada this summer, it may not be human. That’s because a robot is thumbing its way across our neighbor to the north as part of a collaborative research project by several Canadian universities.
SpaceX has 3D printed and successfully hot-fired a SuperDraco engine chamber made of Inconel, a high-performance superalloy, using direct metal laser sintering (DMLS). The company's first 3D-printed rocket engine part, a main oxidizer valve body for the Falcon 9 rocket, launched in January and is now qualified on all Falcon 9 flights.
Stanford University researchers have found a way to realize what’s been called the “Holy Grail” of battery-design research -- designing a pure lithium anode for lithium-based batteries. The design has great potential to provide unprecedented efficiency and performance in lithium-based batteries that could substantially drive down the cost of electric vehicles and solve the charging problems associated with smartphones.
UK researchers have come up with a method for machining aerospace-grade, carbon fiber-reinforced composites, along with high-strength aerospace alloys, using an ultrasonically assisted machining device. It also works on high-strength aerospace alloys.
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