Teste pe două planete: noi elicoptere pentru viitorul de pe Marte

BY: stiridinromania.ro In Magazin
Helicopter on Mars

NASA testează elicoptere pentru Marte în condiții reale și pe Pământ

NASA a atins un nou nivel în testarea elicopterelor pentru Marte, punând la încercare designuri noi și tehnologii avansate. Într-un experiment recent, cercetătorii de la Jet Propulsion Laboratory din California au testat un rotor care ar putea fi utilizat în elicopterele pentru Marte de generația următoare. Acest rotor a fost supus unor viteze aproape supersonice (0,95 Mach), deschizând noi perspective pentru viitoarele misiuni pe Planeta Roșie.

Un aspect important în testarea elicopterelor pentru Marte este atmosfera subțire și gravitația redusă de pe suprafața planetei. Aceste condiții nu pot fi reproduse pe Pământ, ceea ce face ca testarea să fie dificilă. Cu toate acestea, cercetătorii de la NASA au găsit o soluție ingenioasă. Ei au utilizat un simulator spațial de la Jet Propulsion Laboratory, care a permis crearea unei atmosfere similare celei de pe Marte. Aici, rotorul din fibră de carbon a fost testat pentru trei săptămâni, la viteze și unghiuri de înclinare din ce în ce mai mari.

Rotorul testat pe Pământ este cu aproape 10 centimetri mai lung decât cel utilizat în elicopterul Ingenuity de pe Marte. Acesta este mai puternic și are un design diferit. NASA crede că aceste caracteristici pot permite construirea de elicoptere mai mari și mai performante pentru Marte. Totuși, o provocare importantă apare atunci când vârful palelor rotorului se apropie de vitezele supersonice. Vibrațiile cauzate de turbulența generată de aceste viteze pot fi dificil de controlat.

În același timp, elicopterul Ingenuity de pe Marte a stabilit noi recorduri în ceea ce privește altitudinea și viteza de zbor. Inițial, Ingenuity a fost proiectat să zboare de cel mult cinci ori, dar a reușit să realizeze 66 de zboruri până în prezent. Elicopterul a atins viteze și altitudini mai mari decât cele planificate inițial, oferind informații valoroase pentru viitoarele misiuni pe Marte. De asemenea, echipa de la NASA a experimentat și cu viteza de aterizare a elicopterului. Prin aterizări mai lente, se poate reduce greutatea trenului de aterizare și se pot îmbunătăți designul elicopterului.

În continuare, NASA are planificate două zboruri cu viteză mare pentru elicopterul Ingenuity, în care vor fi măsurate performanțele acestuia. Datele obținute în urma acestor teste vor fi extrem de utile pentru dezvoltarea și îmbunătățirea modelelor aero-mecanice ale elicopterelor pentru Marte.

Elicopterul Ingenuity a fost conceput inițial ca o demonstrație tehnologică și a reușit să realizeze zboruri istorice pe Marte. Acesta a depășit cu mult durata sa de viață planificată și a acumulat o cantitate impresionantă de date și imagini de pe suprafața planetei. În viitor, elicopterele pentru Marte ar putea juca un rol important în misiunile de explorare și cercetare a planetei roșii.

(Articolul se bazează pe informațiile furnizate de NASA în sursa originală)

This video combines two perspectives of the 59th flight of NASA’s Ingenuity Mars Helicopter. Video on the left was captured by the Mastcam-Z on NASA’s Perseverance Mars rover; the black-and-white video on the right was taken by Ingenuity’s downward-pointing Navcam. The flight occurred Sept 16. NASA/JPL-Caltech/ASU/MSSS

Engineers will go beyond the ends of the Earth to find more performance for future Mars helicopters.

For the first time in history, two planets have been home to testing future aircraft designs. On this world, a new rotor that could be used with next-generation Mars helicopters was recently tested at NASA’s Jet Propulsion Laboratory in Southern California, spinning at near-supersonic speeds (0.95 Mach). Meanwhile, the agency’s Ingenuity Mars Helicopter has achieved new altitude and airspeed records on the Red Planet in the name of experimental flight testing.

“Our next-generation Mars helicopter testing has literally had the best of both worlds,” said Teddy Tzanetos, Ingenuity’s project manager and manager for the Mars Sample Recovery Helicopters. “Here on Earth, you have all the instrumentation and hands-on immediacy you could hope for while testing new aircraft components. On Mars, you have the real off-world conditions you could never truly re-create here on Earth.” That includes a whisper-thin atmosphere and significantly less gravity than on Earth.

The next-generation carbon fiber rotor blades being tested on Earth are almost 4 inches (more than 10 centimeters) longer than Ingenuity’s, with greater strength and a different design. NASA thinks these blades could enable bigger, more capable Mars helicopters. The challenge is, as the blade tips approach supersonic speeds, vibration-causing turbulence can quickly get out of hand.

To find a space big enough to create a Martian atmosphere on Earth, engineers looked to JPL’s 25-foot wide, 85-foot-tall (8-meter-by-26-meter) space simulator – a place where Surveyor, Voyager, and Cassini got their first taste of space-like environments. For three weeks in September, a team monitored sensors, meters, and cameras as the blades endured run after run at ever-higher speeds and greater pitch angles.

A dual rotor system for the next generation of Mars helicopters is tested in the 25-Foot Space Simulator at NASA’s Jet Propulsion Laboratory on Sept.15. Longer and stronger than those used on the Ingenuity Mars Helicopter, the carbon-fiber blades reached near-supersonic speeds during testing. NASA/JPL-Caltech

“We spun our blades up to 3,500 rpm, which is 750 revolutions per minute faster than the Ingenuity blades have gone,” said Tyler Del Sesto, Sample Recovery Helicopter deputy test conductor at JPL. “These more efficient blades are now more than a hypothetical exercise. They are ready to fly.”

At around the same time, and about 100 million miles (161 million kilometers) away, Ingenuity was being commanded to try things the Mars Helicopter team never imagined they would get to do. 

Fourth Rock Flight Testing

Ingenuity was originally slated to fly no more than five times. With its first flight entering the mission logbook more than two-and-a-half years ago, the helicopter has exceeded its planned 30-day mission by 32 times and has flown 66 times. Every time Ingenuity goes airborne, it covers new ground, offering a perspective no previous planetary mission could achieve. But lately, Team Ingenuity has been taking their solar-powered rotorcraft out for a spin like never before.

“Over the past nine months, we have doubled our max airspeed and altitude, increased our rate of vertical and horizontal acceleration, and even learned to land slower,” said Travis Brown, Ingenuity’s chief engineer at JPL. “The envelope expansion provides invaluable data that can be used by mission designers for future Mars helicopters.”

Limited by available energy and motor-temperature considerations, Ingenuity flights usually last around two to three minutes. Although the helicopter can cover more ground in a single flight by flying faster, flying too fast can confuse the onboard navigation system. The system uses a camera that recognizes rocks and other surface features as they move through its field of view. If those features whiz by too fast, the system can lose its way.

So, to achieve a higher maximum ground speed, the team sends commands for Ingenuity to fly at higher altitudes (instructions are sent to the helicopter before each flight), which keeps features in view longer. Flight 61 established a new altitude record of 78.7 feet (24 meters) as it checked out Martian wind patterns. With Flight 62 Ingenuity set a speed record of 22.3 mph (10 meters per second) – and scouted a location for the Perseverance rover’s science team.

The team has also been experimenting with Ingenuity’s landing speed. The helicopter was designed to contact the surface at a relatively brisk 2.2 mph (1 mps) so its onboard sensors could easily confirm touchdown and shut down the rotors before it could bounce back into the air. A helicopter that lands more slowly could be designed with lighter landing gear. So, on Flights 57, 58, and 59 they gave it a whirl, demonstrating Ingenuity could land at speeds 25% slower than the helicopter was originally designed to land at.

All this Martian Chuck Yeager-ing is not over. In December, after solar conjunction, Ingenuity is expected to perform two high-speed flights during which it will execute a special set of pitch-and-roll angles designed to measure its performance.

“The data will be extremely useful in fine-tuning our aero-mechanical models of how rotorcraft behave on Mars,” said Brown. “On Earth, such testing is usually performed in the first few flights. But that’s not where we’re flying. You have to be a little more careful when you’re operating that far away from the nearest repair shop, because you don’t get any do-overs.”

More About Ingenuity

Ingenuity began its life at Mars as a technology demonstration. It first flew on April 19, 2021, hovering 10 feet (3 meters) for 30 seconds. Four more flights in as many weeks added 499 seconds and saw the helicopter flying horizontally over the surface for 1,171 feet (357 meters). After proving flight was possible on Mars, Ingenuity entered an operations demonstration phase in May 2021 to show how aerial scouting could benefit future exploration of Mars and other worlds.

The Ingenuity Mars Helicopter was built by JPL, which also manages the project for NASA Headquarters. It is supported by NASA’s Science Mission Directorate. NASA’s Ames Research Center in California’s Silicon Valley and NASA’s Langley Research Center in Hampton, Virginia, provided significant flight performance analysis and technical assistance during Ingenuity’s development. AeroVironment Inc., Qualcomm, and SolAero also provided design assistance and major vehicle components. Lockheed Space designed and manufactured the Mars Helicopter Delivery System.

At NASA Headquarters, Dave Lavery is the program executive for the Ingenuity Mars Helicopter.

News Media Contacts

DC Agle
Jet Propulsion Laboratory, Pasadena, Calif.

Alana Johnson/ Karen Fox
NASA Headquarters, Washington
202-358-1501 / 301-286-6284
alana.r.johnson@nasa.gov / karen.c.fox@nasa.gov


Acest titlu a fost scris de inteligență artificială Chat GPT, unele date pot fi incorecte. Pentru stirea originala, verificati sursa: Link catre sursa

Sursa si foto: NASA

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