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August 20, 2019 | International, Aerospace
New F-35 Modification Facility Brings Strategic Capability to FRCE
By Heather Wilburn, Fleet Readiness Center Public Affairs
MARINE CORPS AIR STATION CHERRY POINT, N.C. (NNS) -- A recently-completed facility will bring a new strategic capability to Fleet Readiness Center East (FRCE) and the F-35B Lightning aircraft line next year. When the new F-35 laser shock peening facility is fully operational in 2020, FRCE will be one of two sites in the world that will use laser technology to strengthen F-35 structural components.
Construction of the $6 million facility wrapped in July, and the contractor providing the laser shock peening service will take occupancy in early spring, said Donald Jeter, portfolio manager of the F-35 aircraft line at FRCE. Under that timeline, the first F-35 aircraft inducted for laser shock peening would arrive in June to undergo the validation and verification process, and then the depot will begin work on the remainder of the F-35 fleet that requires the laser shock peening modification.
“This facility is a big get for Fleet Readiness Center East,” Jeter said. “It's very exciting. Being able to perform this laser shock peening process adds a huge strategic capability to our depot. With it, we'll be able to provide a critical support element to the F-35B program and act as a force multiplier for the fleet and the warfighter.”
The 16,000-square-foot facility comprises two bays, where the actual laser shock peening process will take place, and a connected area that will house the laser generator. The state-of-the-art laser shock peening process will allow FRCE to conduct heavy structure modifications that will strengthen areas of the F-35's airframe without disassembling the entire aircraft, said Matthew Crisp, the F-35 Joint Program Office site lead at FRCE.
The process strengthens designs without adding additional metal or weight, which increases the aircraft's life and reduces maintenance costs. It has been used on the F-22 Raptor and in manufacturing aircraft components including engine blades, Crisp said, but has never been employed for the F-35. Now, FRCE will use the technology to help Marine Corps aircraft reach their full life limit.
Aircraft maintenance professionals at FRCE will conduct prep work and some structural modification on the F-35s inducted into the depot, then turn them over to the contractor running the laser shock peening operations. The contractor will complete the process to strengthen the bulkheads and airframes, and FRCE will put the jets back together, perform all the flight test functions and get them back out to the fleet, Jeter said. The end result is aircraft that have been reinforced without adding additional weight, which would reduce the fighter's capabilities by limiting its fuel or weapons carrying capacity.
Shot peening is not a new process, Crisp said, but laser shock peening is unique in that it produces a uniform result across the surface being treated. In laser shock peening, the surface of the media is first coated with an ablative layer and covered with a water tamping layer. A high-energy laser beam is fired at the metal, which creates an area of plasma on the metal's surface. The impact creates a shock wave, which travels through the metal, and compressive residual stresses remain. This compression helps improve the metal's damage tolerance, fatigue life and strength.
“(Shot peening) has been done for decades,” he explained. “It's where you take a solid media, like glass beads or some kind of metal, and you hit the surface of an item – kind of like sandblasting. You just randomly throw it at the surface, and it creates all these surface dimples. What you get is a very inconsistent surface profile, because it's not controlled.”
With laser shock peening, the process is very controlled, Crisp said.
“They create a laser beam that's actually square, and the intensity is consistent across the entire laser beam – it's the exact same at the very edge of the beam as it is in the middle,” he said. “They come up with a grid pattern and stack the squares up right beside each other, so the entire surface of the part is completely uniform. You don't have the weak spots in between these areas that would then induce cracking later.”
Jeter said he expects laser shock peening to be a main focus of the F-35 line for the next four to five years. Once the first two aircraft have undergone the validation and verification process, it will be a sprint to the finish to complete modifications on the remainder of the F-35B fleet that requires this treatment.
“After that val/ver event, the aircraft will basically be nose-to-tail,” Crisp added. “We'll completely fill every aircraft stall that's here, and for the next five years, when one leaves another will come in. That's critical, because this process has to be done on every single airplane that requires it.”
The workload does not include every F-35 ever produced, although it does include B and C models, and also encompasses F-35 aircraft owned by partner nations. FRCE will focus solely on the B variant, while Ogden Air Force Base in Utah will work on the F-35C models and take any F-35B overflow.
After the first round of laser shock peening modifications, what comes after that is still to be determined, Crisp said.
“I'm sure there will be some follow-on work,” he said. “And beyond the F-35 program, this is a little bit exciting, because this really is cutting-edge technology and we have it here at FRCE. I think maybe within the engineering community here, as people find out more about it, they may open additional discussions about how we could implement this on other aircraft lines. We might find a future capability we want to look at.”
FRCE is North Carolina's largest maintenance, repair, overhaul and technical services provider, with more than 4,200 civilian, military and contract workers. Its annual revenue exceeds $720 million. The depot generates combat air power for America's Marines and Naval forces while serving as an integral part of the greater U.S. Navy; Naval Air Systems Command; and Commander, Fleet Readiness Centers.
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March 29, 2019 | International, Aerospace
DARPA: In the Sky and on the Ground, Collaboration Vital to DARPA’s CODE for Success
On a brisk February morning in the Yuma, Arizona, desert, a swarm of unmanned aerial vehicles equipped with DARPA's Collaborative Operations in Denied Environment system, or CODE, successfully carried out mission objectives, even when communications were offline and GPS was unavailable. One-by-one, six RQ-23 Tigersharks lifted off, fitted with an array of sensors onboard. Next to the runway at the U.S. Army's Yuma Proving Ground, the mission team inside a small operations center tracked the aircraft and as many as 14 additional virtual planes on an aerial map. The capstone demonstration paired program performer Raytheon's software and autonomy algorithms and Johns Hopkins University Applied Physics Laboratory's White Force Network to create a realistic, live/virtual/constructive test environment. During four demonstration runs, the team activated a variety of virtual targets, threats, and countermeasures to see how well the Tigersharks could complete their objectives in suboptimal conditions. “Exactly how the aircraft continue to work together in degraded conditions is the most challenging aspect of this program,” said Scott Wierzbanowski, the DARPA program manager for CODE in the Tactical Technology Office. “Current procedures require at least one operator per UAV in the field. Equipped with CODE, one operator can command multiple aircraft; and in a denied environment, the aircraft continue toward mission objectives, collaborating and adapting for deficiencies.” Before, if operators lost communications with a UAV, the system would revert to its last programmed mission. Now, under the CODE paradigm, teams of systems can autonomously share information and collaborate to adapt and respond to different targets or threats as they pop up. “CODE can port into existing UAV systems and conduct collaborative operations,” said Wierzbanowski. “CODE is a government-owned system, and we are working closely with our partners at the Air Force Research Laboratory and Naval Air Systems Command to keep each other informed of successes and challenges, and making sure we don't replicate work. In the end, our service partners will leverage what we've done and add on what they need.” The Tigersharks employed in the demonstration are surrogate assets for CODE. Each has about one-tenth the speed and performance of the aircraft planned for integration, but shows traceability to larger platforms. Constructive and virtual threats and effects presented by the White Force Network are appropriately scaled to the Tigersharks' capabilities. “It's easy to take the CODE software and move it from platform to platform, both from a computer and vehicle perspective. It could be a manned aircraft, unmanned aircraft, or a ground vehicle,” said J.C. Ledé, technical advisor for autonomy with the Air Force Research Laboratory. “The concept for CODE is play-based tactics, so you can create new tactics relatively easily to go from mission to mission.” The Naval Air Systems Command (NAVAIR) will take ownership of CODE after DARPA closes out the agency's role in the program this year. It already has built a repository of algorithms tested throughout the development process. “What we're doing with the laboratory we set up is not just for the Navy or NAVAIR. We're trying to make our capabilities available throughout the entire DoD community,” said Stephen Kracinovich, director of autonomy strategy for the Naval Air Warfare Center Aircraft Division (NAWCAD). “If the Army wanted to leverage the DARPA prototype, we'd provide them not just with the software, but an open development environment with all the security protocols already taken care of.” Kracinovich says NAWCAD has a cadre of people with hands-on knowledge of the system, and is ready to help port the capability to any other DoD entity. That ease of transition puts CODE technologies on a clear path to assist deployed service members by enabling collaborative autonomous systems to operate in contested and denied environments with minimal human supervision. https://www.darpa.mil/news-events/2019-03-22