9 juillet 2019 | International, Aérospatial

These super-small drones no longer need a battery

By:

To be a fly on the wall, an observer must be ubiquitous, unobtrusive and quiet. What if, instead, the observer was just a tiny fly-sized robot, independently powered, able to travel like its insect inspiration? That's one possibility from the long line of work on the RoboBee series of miniature flying machines, the latest of which recently flew independently under its own photovoltaic power.

RoboBee is a long-running project of the Harvard Microrobotics Lab and the Wyss Institute for Biologically Inspired Engineering. The end goal is ultimately controlled swarms of insect-sized flying machines, with visions of these swarms performing everything from plant pollination to surveillance. These are ambitious aims, and all have been hindered to this point by a fundamental constraint on the form: the robots are too small to carry batteries.

Much of the flight design uses a tethered power supply, allowing the designers to craft Piezoelectric motors that expand and contract as electrical current passes through the muscle-like membranes. This created wings that could flap and propel the robot upward, but it wasn't until recently that the robot could do it on its own power supply.

RoboBees are smaller than any drone currently employed by the U.S. military, minute enough to make the palm-sized Black Hornet feel gargantuan. Without a sensor payload, it'd be a novelty, but the military has already invested in cheap, expendable sensor-carrying drone gliders for tasks such as meteorological data collection. Should this power supply enable RoboBees to support a meaningful sensor package, they could be used in a similar fashion, scattered as sensors that can flap their way into a new position.

Holding six solar power cells on a stick, and with a second set of wings, the vehicle successfully flew under its own power, even if only for the briefest of moments. The researchers' documentation of their project was published in scientific journal Nature June 26, appearing under the title “Untethered flight of an insect-sized flapping-wing microscale aerial vehicle.”

The whole RoboBee weights 259 milligrams, or less than a paperclip, and under special lights was able to generate enough lift to support an additional payload of 70 mg, which could be used for lightweight sensors, control electronics, or larger power supply in the future. Fitting sensors to a craft the small is likely a challenge, but also essential for the promise of the device.

There is also the small matter that, even using photovoltaic cells, the robot needs an alien sun to fly.

“The Robobee X-Wing needs the power of about three Earth suns to fly, making outdoor flight out of reach for now,” stated the summary from Harvard's School of Engineering and Applied Sciences. “Instead, the researchers simulate that level of sunlight in the lab with halogen lights.”

Should the sensors exist, and the device become capable of outdoor flight, microrobotics could become a ubiquitous part of modern life, performing functions alongside insects and relaying sensor information back as an unseen intelligence platform.

https://www.c4isrnet.com/unmanned/robotics/2019/07/08/these-super-small-drones-no-longer-need-a-battery/

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  • House passes $983 billion spending package 226-203, bucking White House

    20 juin 2019 | International, Autre défense

    House passes $983 billion spending package 226-203, bucking White House

    By: Joe Gould WASHINGTON ― The Democratic-controlled House passed a $985 billion appropriations package for fiscal 2020 that aims to fund national security at $17 billion less than the White House requested, end the post-2001 war authorizations after eight months, pull military support in Yemen and defund the W76-2 nuclear warhead. The vote was 225-203, with seven Democrats voting with the Republican minority. Zero Republicans voted for the bill. It's a salvo from Democrats in FY20 budget negotiations with the GOP-controlled Senate and White House, and the White House has threatened that President Donald Trump would veto the massive bill. Beyond the above provisions and others, the administration strongly objected to language meant to block Pentagon funds being applied to a wall on the southern border. The threat foreshadows pushback from the Senate and the White House, in part because both advocated for a $750 billion national defense budget, while the House-passed bill is consistent with a $733 billion national defense budget. (The House bill would fund the Pentagon alone at $8 billion less than the White House request.) The four-bill “minibus” contained the two largest of the 12 annual appropriations bills; the Labor, Health and Human Services, Education, and Related Agencies bill and the Defense bill. For the defense, it totaled $645.1 billion in base-defense funding, and $68.1 billion in the budget-cap-exempt wartime funding account. House Appropriations Committee Chairwoman Nita Lowey, D-N.Y., emphasized the package's investments outside the Pentagon, including a 4 percent increase in State Department funding. “This bill rejects the administration's unacceptable budget request and irresponsible policies and, rather, strives to uphold many bipartisan congressional priorities,” Lowey said when the bill was introduced. “America's foreign policy is strongest when diplomacy, development and defense are well-funded and equally prioritized, as many of today's global challenges cannot be addressed by military intervention alone.” Republicans have opposed the minibus as an empty exercise because Congress lacks a bipartisan deal to ease spending caps and avoid across-the-board sequestration cuts. Nor does the bill contain border wall funding sought by conservative Republicans. “Moving these bills as-is is a wasted opportunity because the bills are far from what the president has requested and will support,” said the House Appropriations Committee's ranking member, Rep. Kay Granger, R-Texas. “Defense spending does not meet the request while nondefense spending greatly exceeds the request in current levels. This could lead to a veto and another government shutdown, something both [parties] agree would be devastating ― in addition to these funding concerns.” The White House issued a veto threat last week that spelled out its objections to provisions in the bill that would end the post-2001 war authorizations after eight months and pull military support in Yemen―and because the House parked less defense spending in the budget-cap skirting war fund. The language surrounding the authorization for the use of military force, Granger said, could jeopardize the Pentagon's ability to conduct military operations worldwide. “It's a bad policy that will force the DoD to unwind counterterrorism operations overseas if the Congress and the president cannot agree on a new authorization,” she said. To avoid another government shutdown, 12 appropriations bills must pass Congress and get the president's signature by Oct. 1. Negotiations between the White House and lead lawmakers on a deal to ease budget caps has been ongoing, according to a statement last week by Senate Appropriations Committee Chairman Sen. Richard Shelby, R-Ala.. (The Senate Appropriations Committee hasn't yet moved any of its bills.) Another likely sticking point in budget talks with the GOP-controlled Senate and the White House is the minibus' bill's prohibition on the Defense Department spending funds to implement its policy on open transgender service. The vote to approve an amendment that contained the prohibition broke mostly along party lines, 234-183. The amendment targets a March 12 memo that would largely bar transgender troops and military recruits from transitioning to another gender, and require most individuals to serve in their birth sex. The House defeated Republican amendments that would have added back $19.6 million for the W76-2 low-yield submarine-launched nuclear warhead and would have added back $96 million for “conventional missile systems” in the range of the Intermediate-Range Nuclear Forces Treaty. However, it also defeated a Democratic amendment that would have barred funding for research on the Long Range Standoff weapon. The bill was passed out of committee with language to restrict the Pentagon's authority to transfer money between accounts to $1.5 billion ― a response from Democrats to the administration's use of defense funds for Trump's proposed border wall. Next week, the House is expected to take up a separate minibus that contains the Department of Homeland Security spending bill, which was at the heart of last year's 35-day government shutdown. https://www.defensenews.com/congress/2019/06/19/house-passes-983-billion-spending-package-226-203-bucking-white-house/

  • OMFV: Army Seeks Industry Advice On Bradley Replacement

    27 février 2020 | International, Terrestre

    OMFV: Army Seeks Industry Advice On Bradley Replacement

    Having rebooted the Optionally Manned Fighting Vehicle program, the Army is now is asking industry input on how to achieve nine goals, from survivability to mobility to streamlined logistics. By SYDNEY J. FREEDBERG JR.on February 26, 2020 at 4:01 AM Two months ago, the Army cancelled its original solicitation to replace the M2 Bradley troop carrier after no company could meet the strict requirements. This afternoon, the Army officially asked for industry input on how to achieve nine broadly-defined “characteristics” for the future Optionally Manned Fighting Vehicle. “Feedback may be submitted in any form (concepts, information papers, technical papers, sketches, etc.),” says the announcement on SAM.gov. “The Army would like to obtain this initial feedback prior to 06 March 2020.” This call for suggestions on how to move forward comes just weeks after the Army issued a surprisingly apologetic survey asking industry what they did wrong the first time around. It's part of a newly humble approach in which the Army doesn't prescribe formal requirements up-front but instead lays out broad objectives and asks industry how best to achieve them. The chief of Army Futures Command, Gen. Mike Murray, gave reporters a preview of the nine characteristics three weeks ago, but the list announced today is much more detailed – though still leaving plenty of room for companies to brainstorm solutions. Our annotated highlights from the announcement – the emphasis is in the original: Background: The OMFV, as part of an Armored Brigade Combat Team (ABCT), will replace the Bradley to provide the capabilities required to defeat a future near-peer competitor's force. The Army is seeking a transformational increase in warfighting capability, not simply another incremental improvement over the current Bradley Fighting Vehicle. Concept of employment: As part of an ABCT, the OMFV will not fight alone, but rather as part of a section, platoon, and company of mechanized infantry.... “Near-peer competitor” is Pentagon jargon for “China or Russia” – chiefly Russia in this case, since the plains of Eastern Europe are a far more likely arena for armored warfare than Pacific islands. That the Army wants “transformational” improvements, not “incremental” ones, shows there's still some real ambition in the vision for this vehicle. At the same time, the OMFV will still fight “as part of an ABCT,” meaning the existing Armored Brigade Combat Team organization — not as part of some all-new organization with all-new equipment, as was once envisioned for the cancelled Future Combat Systems. Survivability. The OMFV must protect the crew and Soldiers from emerging threats and CBRN environments. The OMFV should reduce likelihood of detection by minimizing thermal, visual, and acoustic signatures. In other words, the vehicle needs to give the crew a chance of survival against cutting-edge anti-tank missiles, precision-guided artillery, attack drones and other such “emerging threats,” as chemical, biological, radiological, and nuclear contamination (CBRN). That does not mean the vehicle itself has to survive intact. The way this is worded, if a hit totals the OMFV but the soldiers inside can walk away, the Army will count that as a win. (The JLTV 4×4 truck takes this same approach to roadside bombs). So the OMFV doesn't necessarily have to have heavy armor protecting the entire vehicle. It could have a heavily armored crew compartment, light armor elsewhere, and an Active Protection System to intercept incoming threats. (The Russian T-14 Armata uses this combination). It also should avoid being spotted in the first place by eye, ear, or thermal sensor, which might favor designs with hybrid-electric motors that can switch from hot, noisy diesels to a battery-driven stealth mode. Mobility. The OMFV must have mobility that can keep pace with the Abrams in a combined arms fight through rural and urban terrain. That's the M1 Abrams main battle tank, which the existing M2 Bradley and M109 Paladin howitzer were also designed to keep up with. This is another aspect of that “concept of employment” that calls for the OMFV to slot into existing formations and work closely with existing vehicles. Note also the reference to “rural and urban terrain,” which will come up again: Traditionally the Army has avoided city fighting, but as urban sprawl covers ever more of the planet, technology and tactics have to adapt to brutal close-quarters combat. Growth. The OMFV must possess the growth margins and open architecture required for rapid upgrades and insertion of future technologies such as mission command systems, protection systems, and sensors. This characteristic is really where you get the potential for “transformational” improvements. The M2 Bradley was originally introduced in 1980 and, after 40 years of upgrades, it has very little margin left to handle additional weight or – even more important nowadays – power-hungry electronics. The Bradley's lack of room to grow has driven the Army to try replacing it three times already: the original OMFV requirements cancelled this year; the Ground Combat Vehicle cancelled in 2014; and the Future Combat Systems cancelled in 2009. Hopefully, fourth time's the charm. Lethality. The OMFV-equipped platoons must defeat future near-peer soldiers, infantry fighting vehicles, helicopters, small unmanned aerial systems, and tanks as part of a Combined Arms Team in rural and urban terrain. This is a more ambitious hit list than the Bradley, which sports machineguns for killing infantry, a 25 mm autocannon to destroy light armored vehicles, and the obsolescent TOW missile for taking on heavy tanks. The Pentagon is increasingly worried about small drones, which ISIS terrorists have used as flying IEDs and Russian artillery has used as spotters for barrages. With Russia and China developing increasingly sophisticated anti-aircraft systems, there's also a concern that US fighters may not be able to keep enemy attack helicopters at bay, forcing ground forces to handle that threat themselves. These aerial targets require more sophisticated tracking systems, and drones may be best dealt with by electronic jamming or lasers rather than bullets. Weight. The OMFV must traverse 80% of Main Supply Routes (MSRs), national highways, and bridges in pacing threat countries, and reduce the cost of logistics and maintenance. Designs must allow for future growth in components and component weights without overall growth of vehicle weight through modularity and innovation. Weight is the issue that has bedeviled Bradley replacements for two decades. The FCS vehicles, optimized for air transport, were too light to carry adequate armor; GCV was too heavy; and the original OMFV couldn't meet its air transport requirements and its protection requirements at the same time. With most bridges in Eastern Europe unable to safely take weights over 50 tons, too much heavy armor can cripple your mobility. Logistics. The OMFV must reduce the logistical burden on ABCTs and must be equipped with advanced diagnostic and prognostic capabilities. Advanced manufacturing and other innovative techniques should be included in the design that reduce the time and cost of vehicle repairs. There are two big factors that make a vehicle hard to keep supplied and in working order. One is weight – heavier vehicles burn more fuel – and the other is complexity. High-tech is usually high-maintenance. The US military is hopeful that AI-driven predictive maintenance can detect and head off impending breakdowns, and that 3D printing can produce at least some spare parts on demand without a long supply line. Transportability. The OMFV must be worldwide deployable by standard inter- and intra-theater sea, waterway, air, rail, and road modes of transportation. The original OMFV requirement very specifically called for two of the vehicles to fit on a single Air Force C-17 jet transport, which proved undoable with the weight of armor desired. This time, the Army isn't specifying any particular aircraft. In practice, armored vehicles are almost always shipped by sea and, where possible, stockpiled on allied soil well before a crisis erupts. On land, since tracked vehicles aren't designed to drive hundreds of miles by road, they're usually deployed to the battle zone by train or tractor-trailer, both of which have their own weight limits. Manning. The OMFV should operate with the minimal number of crew members required to fight and win. The OMFV should allow commanders to choose between manned or remote operation based on the tactical situation. This is the objective that gave the OMFV its name: Optionally Manned Fighting Vehicle. Now, since it's a Bradley replacement, the OMFV is supposed to be a troop carrier – specifically, the heavily armed and armored kind known as an Infantry Fighting Vehicle – so by definition it needs to carry people. But the Army is intensely interested in having the option to run it by remote control, or maybe even autonomously, to (for example) scout out especially dangerous areas or carry casualties back to an aid post without pulling healthy soldiers out of the fighting line. Training. The OMFV should contain embedded training capabilities that are compatible with the Synthetic Training Environment (STE). STE is the Army's total overhaul of its training simulators, drawing on commercial gaming technology to develop an array of virtual and augmented reality systems using a common database of real-world terrain. Instead of having to use a simulator in a warehouse somewhere, the Army wants troops to be able to run virtual scenarios on the same vehicles they'll actually fight with. All these characteristics are intertwined – and after its past troubles, the Army is acutely aware that maximizing one, such as protection, may compromise another, such as transportability. That's another thing the service wants feedback on, the announcement says: “The Army is interested in industry partners' ability to meet the desired characteristics and what trades” – that is, trade-offs – “may be necessary.” https://breakingdefense.com/2020/02/omfv-army-seeks-industry-advice-on-bradley-replacement

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