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By NASA
2 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
The Ivanpah Solar Electric Generating System is an example of a concentrated solar power plant, which works by having hundreds of reflective panels heating up a central tower. The problem of keeping sunlight directed at the receiver throughout the day brought Jim Clair to request NASA’s help in validating the suspended design now used in Skysun solar power systems.Credit: Cliff Ho/U.S. Department of Energy In the 80 years since the shocking collapse of the Tacoma Narrows Bridge in Washington, engineers have designed suspended structures to minimize their universal weakness: resonance. If not designed to deal with oscillations caused by forces like wind, the frequency of these forces would cause tensions to build and inevitably break the structure.
When Jim Clair examined how to focus mirrors at a concentrated solar energy power plant, he thought about suspending the mirrors on cables but remembered the images of the Tacoma Narrows Bridge shaking itself apart. To determine how well these suspended solar panels would hold up to potentially destructive oscillations, Clair, and his company Skysun LLC in Cleveland, Ohio, sought the help of NASA’s Glenn Research Center in 2016 to verify his design was safe from dangerous resonance.
The Skysun Solar Pollinator is designed to be suspended above plants that thrive in partial shade, and it can generate up to two kilowatts of power. The suspended design was validated by Glenn Research Center dynamicists under the Adopt-A-City program. Credit: Skysun LLC Trevor Jones, a dynamicist at Glenn, went to nearby Lorain County Community College to work with a prototype of the system. Jones induced vibrations in the cables with hammers and took measurements of the resulting oscillations. Based on this data, Jones designed a program that could accurately model the design’s tensile strength against wind-induced oscillations at any scale. With the dimensions plugged in, the program did the math and proved that Clair’s idea would work without shaking apart.
Today, Skysun builds various suspended solar energy generation systems, ranging from the hammock-like Skysun Solar Pollinator to full-sized solar pergolas that provide both electricity and shade.
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Last Updated Mar 12, 2024 Related Terms
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By European Space Agency
Video: 00:13:54 A year has passed since the launch of the ESA’s Rosalind Franklin rover mission was put on hold, but the work has not stopped for the ExoMars teams in Europe.
In this programme, the ESA Web TV crew travel back to Turin, Italy to talk to the teams and watch as new tests are being conducted with the rover’s Earth twin Amalia while the real rover remains carefully stored in an ultra-clean room.
The 15-minute special programme gives an update on what happened since the mission was cancelled in 2022 because of the Russian invasion of Ukraine, the plan ahead, the new challenges, the latest deep drilling test and the stringent planetary protection measures in place.
ESA’s Rosalind Franklin rover has unique drilling capabilities and an on-board science laboratory unrivalled by any other mission in development. Its twin rover Amalia was back on its wheels and drilled down 1.7 metres into a martian-like ground in Italy – about 25 times deeper than any other rover has ever attempted on Mars. The rover also collected samples for analysis under the watchful eye of European science teams.
ESA, together with international and industrial partners, is reshaping the ExoMars Rosalind Franklin Mission with new European elements, including a lander, and a target date of 2028 for the trip to Mars.
The newly shaped Rosalind Franklin Mission will recover one of the original objectives of ExoMars – to create an independent European capability to access the surface of Mars with a sophisticated robotic payload.
More information: https://www.esa.int/ExoMars
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By European Space Agency
The first simulation of the ExoMars Rosalind Franklin rover driving off its landing platform closed out an incredible year of preparations as the mission now marches with confidence towards a September launch.
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