Lockheed Martin made history recently when, for the first time, it tested an F-16 Joint Strike Fighter (JSF) at the Wright Patterson Air Force Base in Dayton, Ohio with electric rather than hydraulic flight control actuation. "Recent advances in power switching, capacitors, and high-voltage dc power electronics were the primary technical breakthrough to allow development to be successful," says Dennis Eicke, a mechanical engineer and the program manager for the F-16 project. "There is still a place for hydraulics in F-16s, but the move to electric actuation allows us the flexibility to integrate redundancy and emergency systems differently," he says. Eicke adds that electric actuation is an enabler technology that simplifies the whole power generation and distribution system. "Electric actuation with the integrated subsystems approach selected for JSF provides additional benefits in reduced aircraft weight, improved survivability, and improved maintainability," he says. The switch from hydraulic to electric actuation translates into a 15% reduction in the fighter plane's vulnerable area, a 5% reduction in aircraft procurement costs, a 6% reduction in gross take-off weight, and a 13% reduction in lifecycle cost compared to current F-16s. For the purpose of the test, some hydraulic components remained in the F-16, according to Dick Kotalik, an electrical engineer and technical team leader at Parker Hannifin's Control System Div., the company that supplied the electro-hydrostatic actuators (EHAs) for the test aircraft. Five EHAs replaced the conventional hydraulic actuators to control the flaperons, horizontal tail, and rudder. For more information about hydraulics, contact Kotalik at firstname.lastname@example.org.
What makes this movie stand out from the typical high school sports story is that the teenagers are undocumented immigrants, and the big game is a NASA-sponsored marine robotics competition. Like many other Hollywood movies, however, Spare Parts only tells part of the story. What the film shows -- and doesn’t show -- raises important issues affecting STEM education in the US.
Instead of sifting through huge amounts of technical data looking for answers to assembly problems, engineers can now benefit from 3M's new initiative -- 3M Assembly Solutions. The company has organized its wealth of adhesive and tape solutions into six typical application areas, making it easier to find the best products to solve their real-world assembly and bonding problems.
Load dump occurs when a discharged battery is disconnected while the alternator is generating current and other loads remain on the alternator circuit. If left alone, the electrical spikes and transients will be transmitted along the power line, leading to malfunctions in individual electronics/sensors or permanent damage to the vehicle’s electronic system. Bottom line: An uncontrolled load dump threatens the overall safety and reliability of the vehicle.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.