Tag: engineering

SpaceX – The Blue Danube

6:01 pm

An evening pause: This SpaceX video taken by a camera attached to the fairing of the Falcon 9 rocket is cool not because of the video itself. Cameras on rockets have become routine, even for NASA. What is cool is that they have unveiled it using the same Johann Strauss waltz used in the move 2001: A Space Odyssey (1968). It shows that SpaceX is aware of the cultural impact of what they do.

Hat tip Tom Wilson, Tom Biggar, and others.

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75% of Russia’s satellite electronics come from U.S.

2:19 pm

It isn’t just us dependent on them: One Russian aerospace industry expert noted today that three-quarters of all their satellite electronics comes from the United States.

According to [Nikolay Testoyedov], up to 75 percent of the electronic components for Russian satellites come from the US. Consequently, if it retaliates should Moscow refuse to sell RD-180 rocket motors to Washington – which Deputy Prime Minister Dmitry Rogozin has threatened – Russia’s satellite program would be frozen for at least two years. “The imported electronic components in our satellites represent 25 to 75 percent of the total in communications; in military ones, somewhat less; in commercial ones, more,” Testoyedov says. Of these imported components, approximately 83-87 percent come from the United States thus giving Washington the whip hand.

If we stop providing these electronics he estimates that after their present stock runs out in about a year it would take at least two years before Russia could replace these American-made parts.

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NASA to launch first interplanetary cubesats

9:13 am

The competition heats up: When it launches its next Mars mission, a stationary lander, NASA will piggyback two cubesats, designed to fly past Mars and relay communications during the landing.

As I’ve noted earlier, standardized small cubesats are the future of unmanned satellite operations. Expect them to increasingly replace all types of larger satellites. And because they are small and cheap (both to make and launch), expect them to lead to a burst of new capitalistic activity in space.

Update: In related news, a small private company has delivered to NASA the first thrusters designed for cubesats. Up until now, cubesats have not been maneuverable. These thrusters will change that.

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New images from New Horizons of Pluto

7:29 pm

Images taken by New Horizons over a four day period at the end of May show Pluto to be a planet with distinct areas of bright and dark.

The images are still very fuzzy and require a great deal of processing to tease out the detail that is seen. If anything, they resemble images of Mars taken from Earth before the space age. Thus, one must treat these the dark and light areas with great skepticism. We are seeing evidence of different surface topography and geology, but to pin it down more precisely at this time would be a mistake. The spacecraft has to get closer for us to know better what we are seeing.

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Is this Philae?

9:14 am

Philae?

Cool image time! The Rosetta science team has spent much effort trying to locate Philae, which attempted to land on Comet 67P/C-G in November. The image on the right shows what they think is their best candidate, the bright feature in the center. It was not there prior to Philae’s landing attempt.

Because there are many uncertainties, however, this might not be Philae.

Ultimately, a definitive identification of this or any other candidate as being Philae will require higher-resolution imaging, in turn meaning closer flybys. This may not be possible in the near-term, as issues encountered in navigating close to the comet mean that the opportunity to make flybys at significantly less than 20 km from the surface may be on hold until later in the mission. But after the comet’s activity has subsided, Rosetta should be able to safely operate in close proximity to the comet nucleus again.

The other possibility of further refining Philae’s location would come if the lander were to receive enough power to wake-up from its hibernation and resume its scientific study of 67P/C-G. Then, CONSERT could be used to perform additional ranging measurements and significantly reduce the uncertainties on the lander’s location. At the moment, Philae is still in hibernation, but the mission team remain hopeful that, as the comet moves closer to the Sun along its orbit, the lander will receive enough power in the coming weeks or months to wake up and transmit a signal to Rosetta.

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A compilation of robots falling down at the DARPA Robotics Challenge

12:18 pm

More information here. It seems that on the dry run prior to the start of competition, not many robots fell over. Then on Day 1, when the competition was for real, a lot had problems standing up.

The impressive thing about these falls is that, although they look pretty bad, the robots were just fine (well, most of them). After humans got them back on their feet and gave them a reboot, the machines were ready to run again. Team IHMC’s Atlas fell twice during their run and it still scored 7 points (of a maximum of 8). Team MIT’s Atlas had a bad stumble out of the vehicle and also went on to complete most of the course. So it’s a good thing that robots are falling at the DRC Finals—that’s how we’re going to make them better.

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SpaceX begins planning a 4,000 satellite internet constellation

9:46 am

The competition heats up: SpaceX has filed papers with the FCC to begin testing the design and construction and launch of a constellation of 4,000 satellites for providing global internet access.

Musk’s FCC filing proposes tests starting next year. If all goes well, the service could be up and running in about five years. The satellites would be deployed from one of SpaceX’s rockets, the Falcon 9. Once in orbit, the satellites would connect to ground stations at three West Coast facilities. The purpose of the tests is to see whether the antenna technology used on the satellites will be able to deliver high-speed Internet to the ground without hiccups.

It appears to me that Musk’s constellation will be made up of cubesats, small and cheap to build, and easy to launch in large numbers as secondary payloads on every Falcon 9 launch. In other words, as long as SpaceX can get customers to pay for launches of large satellites on its Falcon 9, Musk will be able to launch and maintain his constellation of cubesats for free.

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The collapse of Russian scientific innovation

9:13 am

Link here. This report documents much of what I have been seeing in the Russian space industry: an aging workforce, a lack of innovation, and concentration of power to Moscow and the central government, and an exodus of the best minds to other countries.

It appears that all of the solutions that have been imposed by Putin’s government are exactly the worst things you could do and will only make the problems grow with time.

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Russia announces revised launch schedule for ISS

10:11 pm

As promised, the Russians today revealed their revised schedule of launches for ISS for the next few months.

The next manned launch will be on July 3, and though it will use a Soyuz rocket, it will not use the upgraded rocket version that had a conflict with its Progress freighter during the April launch. They have still not described what that conflict was, or how they plan to fix it on future launches.

Meanwhile, a Soyuz capsule docked to ISS suddenly fired its thrusters unexpectedly during testing of the station’s radio system. The burn changed the station’s orientation, which required other thrusters to compensate.

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Finding caves on Mars

5:40 pm

A new study of pits on Mars has isolated one particular type of pit that has all the features of an Earth-like cave entrance, with a large number located in the regions around the giant volcanoes where evidence of past glacier activity has been found. From the abstract:

These Atypical Pit Craters (APCs) generally have sharp and distinct rims, vertical or overhanging walls that extend down to their floors, surface diameters of ~50–350 m, and high depth to diameter (d/D) ratios that are usually greater than 0.3 (which is an upper range value for impacts and bowl-shaped pit craters) and can exceed values of 1.8. Observations by the Mars Odyssey Thermal Emission Imaging System (THEMIS) show that APC floor temperatures are warmer at night and fluctuate with much lower diurnal amplitudes than nearby surfaces or adjacent bowl-shaped pit craters.

In other words, these pits are deeper with steeper and overhanging walls that suggest underlying passages. They also maintain warmer temperatures at night with their day/night temperatures changing far less than the surface, similar to caves on Earth where the cave temperature remains the same year-round.

The study’s most important finding, from my perspective, was the location of these pit craters.
» Read more

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Russia completes Soyuz launchpad at Vostochny

10:43 am

The competition heats up: Russia has completed assembly of the Soyuz-2 launch system at Vostochny a month ahead of schedule.

I must say that this story confuses me. Just this past weekend it was reported in the Russian press that they were abandoning efforts to build a Soyuz launchpad for manned flights at Vostochny and would instead focus on Angara. Why then are they finishing this Soyuz-2 launchpad now, and ahead of schedule?

One theory: The new launchpad might be for a new upgraded Soyuz rocket to be used for unmanned missions and thus different than the manned launchpad.

Or it might be that even though the government canceled it, workers continued to work on it and finished it, unaware of the cancellation. It is not unusual in big government projects for the right hand to not know what the left hand is doing.

UPDATE: My first theory was correct. Anatoly Zak of russianspaceweb.com has confirmed to me in an email that they only cancelled manned Soyuz flights at Vostochny. This launchpad will be used for an upgraded Soyuz rocket for unmanned flights.

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Parachute problems again for NASA’s flying saucer

5:06 pm

In its second flight today NASA’s engineering vehicle for testing Mars landing technologies, dubbed a flying saucer by the press because of its shape, had a similar problem as in its first flight, with its parachutes failing to inflate properly during landing.

More here. This test was not only to check out landing technologies, it was to check out the redesigned parachute that had failed in the previous test last year.

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Problems at Stratolaunch

10:29 am

In the heat of competition: Stratolaunch and Orbital ATK have quietly parted ways as problems have developed in building Stratolaunch’s giant first stage aircraft.

The company went with a radical engineering idea — using a giant airplane as their first stage — which might turn out great but could just as easily become a disaster and failure. Such ideas are by their nature filled with many unknowns.

In a sense, this story validates SpaceX’s approach to developing new space technology, which is to take known engineering and to upgrade it while refining the production methods for building it to lower costs. With this approach, you lower risks by reducing the number of unknowns you have to deal with.

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LightSail successfully deploys solar sail

9:58 am

Engineers have confirmed that the cubesat prototype LightSail has successfully deployed its solar sails.

This is I think only the second time a solar sail has successfully deployed in space. More significant to me is the fact that it is the first time this kind of complex engineering test has been tried using a cubesat. If cubesats can begin to handle these kinds of tasks, unmanned satellite technology is going to take a gigantic leap forward.

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Dawn makes a movie of Ceres

9:28 am

Cool image time! Using images that Dawn has accumulated since it entered orbit around Ceres, scientists have created an animation showing the dwarf planet as it rotates.

Video below the fold. Note that this is an animation. They have filled in the gaps between images to make the rotation smooth, exaggerated the scale two times to bring out details, and added a background of stars that is not visible in the original images. Even so, this video is scientifically useful, as it shows Ceres in its entirety. It is also very spectacular.
» Read more

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Jets on Comet 67P/C-G now persist into the night

9:18 am

jets from Comet 67P/C-G

Cool image time! Rosetta’s high resolution camera is now finding that, due to increased activity as Comet 67P/C-G approaches the sun, jets of material now continue to evaporate off the surface even after sunset.

“Only recently have we begun to observe dust jets persisting even after sunset”, says OSIRIS Principal Investigator Holger Sierks from the Max Planck Institute for Solar System Research (MPS) in Germany. In the past months, the comet’s activity originated from illuminated areas on the day side. As soon as the Sun set, these jets subsided and did not re-awake until after the next sunrise. (An exception poses an image from 12 March, 2015 showing the onset of a dust jet on the brink of dawn.)

According to OSIRIS scientists, the jets now occurring even after sunset are another sign of the comet’s increasing activity. “Currently, 67P is rapidly approaching perihelion in mid-August”, says Sierks. At the time the image was taken, comet and Sun were only 270 million kilometers apart. “The solar irradiation is getting more and more intense, the illuminated surface warmer and warmer”, Sierks adds.

Because the jets are now remaining active into the night, it is allowing us to see more precisely their points of origin on the surface, which can then be studied more closely in daylight. Previously it was difficult in daylight to pinpoint the exact spot where the jets began.

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LightSail deploys its solar sails

10:48 pm

Though full confirmation will not come until later tonight, telemetry from LightSail suggests that its solar sails have successfully begun deployment.

Telemetry received on the ground showed motor counts climbing to the halfway point before LightSail traveled out of range. Power levels were consistent with ground-based deployment tests, and the spacecraft’s cameras were on. “All indications are that the solar sail deployment was proceeding nominally,” wrote mission manager David Spencer in an email update.

They will have to wait until the cubesat comes back in range at 2:46 am (Eastern) to see if the deployment completed successfully, as well as download images.

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LightSail back in business?

8:57 am

The Planetary Society’s solar sail engineering test called LightSail has re-established communications with the ground, allowing for the possibility that it can finally achieve its solar sail deployment, the main purpose of the mission.

I had previously reported that the sails had deployed, but a commenter correctly noted that only the panels have deployed, not the sails themselves, which need full battery power. The communications problem has been related to a battery charging problem. They are hoping that the batteries will get charged by mid-day today when they will try to deploy the sails.

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Manned flights from Vostochny delayed

9:02 am

In order to save construction costs at its new spaceport at Vostochny, Russia has decided to delay its first manned flight there until 2023.

They originally were going prepare a launchpad for Soyuz rockets so that they could do a manned launch at Vostochny as early as 2019, but had already admitted this was inefficient and had abandoned the plan. Now they have admitted that it will take until 2023 for them to get Vostochny and Angara ready for manned flights.

That it will still take almost 8 years to prepare a launchpad and get Angara ready to launch manned capsules, however, seems an ungodly long period of time. It should not take that long.

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Airbus unveils its first stage re-useability concept

2:32 pm

The competition heats up: Airbus unveiled today its prototype design to recover and reuse the engines and avionics of its Ariane rockets.

Herve Gilibert, technical director for Airbus’ Space Systems division, said the Adeline propulsion unit — engine and avionics — is where lies most of the value of the first stage. The Airbus team concluded that SpaceX’s design of returning the full stage to Earth could be simplified by separating the propulsion bay from the rest of the stage, protecting the motor on reentry and, using the winglets and turbofans, return horizontally to a conventional air strip. “We are using an aerodynamic shield so that the motor is not subjected to such high stress on reentry,” Gilibert said. “We need very little fuel for the turbofans and the performance penalty we pay for the Ariane 6 launcher is far less than the 30 percent or more performance penalty that SpaceX pays for the reusable Falcon 9 first stage.

Gee, for decades Arianespace and Boeing and Lockheed Martin and everyone else in the launch industry insisted it made no economic sense to try to recover and reuse the first stage of their rockets. Then SpaceX comes along and makes an effort to do so, without as yet even coming close, and suddenly everyone agrees it is economically essential to do it as well.

Isn’t competition wonderful?

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Soyuz rocket to launch this week

8:36 am

In the heat of competition: Despite releasing very vague conclusions to its Soyuz rocket failure investigation, the Russians are going to resume Soyuz launches, beginning this week.

Update: The launch on Friday was successful.

I imagine that NASA will insist on more details before the next manned flight, including how they have solved the flaw that caused the Soyuz/Progress failure. At least, that is what a private company would do. What a government agency will do is sometimes beyond my understanding.

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