Tag: engineering

Soyuz docking issue during ISS arrival

9:37 am

When the manned Soyuz rendezvoused and docked with ISS yesterday, there was a problem with the automatic docking system, requiring the astronauts to take over and manually dock the spacecraft.

Initial reports suggested the failure was with the radar system having a conflict with the communications systems on the berthed Cygnus capsule. The link above instead claims the failure was caused by a malfunction in one of the Soyuz attitude thrusters. The former would be annoying but less of a concern than the latter. A thruster malfunction is somewhat rare, and would be another indication of the serious quality control problems in the Russian aerospace industry.

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New China manned vehicle under development

7:42 pm

The competition heats up: China has begun development of two versions of a second generation manned capsule.

Instead of the three-module arrangement of the current Shenzhou vehicle, the future Chinese crew vehicle will adopt a two-module arrangement, with a large inhabitable crew module at the front, and an uninhabitable cylindrical-shaped service module at back. The size of the re-entry vehicle will be twice of Shenzhou’s, capable of accommodating up to six crew members. A docking port and its associated docking sensors are fitted to the front-end of the crew module. The spacecraft can be fitted with two different service modules, with different propulsion systems and propellant capacities.

In other words, rather than copy and upgrade the design of the Russian Soyuz, as they did with their Shenzhou capsule, they will copy and upgrade the American Apollo capsule.

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ULA’s fight to use Russian engines continues

9:06 am

This article provides a detailed account of the political battle between ULA and Congress of its future use of Russian engines in its Atlas 5 rocket.

Congress has imposed a strict limit on the number of engines the company can use. ULA is still lobbying for an increase, claiming that the limit will mean that they will not be able to meet the government military launch needs for a few years when the engines on hand run out and its new American-built engines are not yet available.

In the long run I think this battle is irrelevant. What really matters is what it costs to launch a satellite, and ULA is simply not focused on reducing its costs. Consider this quote from the article, emphasis mine:

ULA has designed a new rocket dubbed Vulcan that features a U.S.-made engine, but this vehicle will not be available until around 2021, assuming the project gets funded — which is by no means a given.

They made a big deal earlier this year about how Vulcan will soon replace Atlas 5 at a lower cost, but it now appears that this was merely a public relations event. ULA wants someone else to pay for this new rocket, and thus has not yet committed any of its own money to begin actual development.

Other companies however are funding the development of their own new American-made rockets that will also be far cheaper to fly. Sooner rather than later our spendthrift Congress is going to mandate that the military use those cheaper rockets. If ULA doesn’t get moving it will be left in the dust, whether or not Congress allows it to use more Russian engines.

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New astronaut crew to ISS, including Brit

8:47 am

A Russian Soyuz rocket today successfully launched a new crew to ISS, including Great Britain’s first official astronaut.

Tim Peake is not the first Brit in space, but he is the first paid for by the British government. The first British citizen to fly in space, back in 1991, was Helen Sharman, whose flight was a publicity stunt mostly paid for by the Russians themselves.

The crew is expected to dock with ISS later today.

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Rosetta hi-res images released

8:41 am

Lots of cool images! The science team running Rosetta’s high resolution camera have finally made available to the public the camera’s large archive of images.

The images cover the period 20 June 2014 – 16 September 2014, corresponding to Rosetta’s approach to the comet, arrival, and insertion into orbit.

In exchange for creating and running the mission, the scientists had been given a 12 month period in which these hi-res images belonged entirely to them. This gave them the chance to use them to publish papers documenting their discoveries. While this is a reasonable arrangement — used by most planetary missions in some manner to reward the scientists who made the mission possible — with Rosetta the hi-res images were kept so close to the vest that practically none have been seen, until now. Moreover, this release is very late, anywhere from 15 to 18 months after the images were taken, not 12.

Most other planetary missions make sure that at least some images are released as the mission proceeds, since the images were paid for by the public. The European Space Agency should take a look at its future policies for publicly-funded missions to make sure the public gets better access in the future.

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Proton launch success

8:22 am

The competition heats up: Russia’s Proton rocket successfully launched a military communications satellite on Sunday.

The link provides a lot of interesting information about the satellite as well as some recent upgrades the Russians have installed in Proton, but for context the last two paragraphs are probably the most important:

Sunday’s launch was the seventy ninth orbital launch attempt of 2015 and the seventh Proton launch of the year. Five of the six previous launches were successful, with May’s launch of Mexsat-1 failing to achieve orbit. Proton has had eleven failures in the last ten years, with 2009 the only year since 2005 in which it has not suffered at least one anomaly.

The next Proton launch is scheduled for 23 December, with another Proton-M/Briz-M carrying the Ekspress-AMU1 communications satellite. Details of any future Garpun launches are not available.

The launch reliability for Proton has seriously fallen since 2005, and to compete in the changing launch market they will need to fix this.

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Second Google Lunar X-Prize launch contract confirmed

10:05 am

The competition heats up: The Google Lunar X-Prize has now confirmed two launch contracts for sending a privately financed and built rover to the Moon by 2017.

Moon Express is now the second company to have a launch contract for their lunar lander spacecraft verified by the X Prize Foundation. An Israeli team, SpaceIL, had its contract to launch a lander on a SpaceX Falcon 9 verified by the foundation in October. SpaceIL will be one of the primary payloads on a launch purchased in September by Spaceflight Industries that will carry about 20 other spacecraft. That initial launch contract verification allowed the foundation to formally extend the competition’s deadline to the end of 2017. Teams have until the end of 2016 to submit their own launch contracts in order to continue in the competition.

Sixteen teams remain in the competition, announced in September 2007, to land a privately-developed spacecraft on the moon, travel at least 500 meters across its surface, and return high-resolution videos and other data. Some teams are cooperating with others for launch arrangements.

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French Mars’ instrument repair looks good

10:00 am

The head of France’s space agency announced today that repairs to their instrument for NASA’s InSight Mars lander will be completed in time to ship the instrument to the U.S. in time for the scheduled March launch.

Briefing reporters here at the COP21 United Nations Climate Change Conference, Jean-Yves Le Gall said the leak, which compromised the required high-precision vacuum chamber carrying InSight sensors, was caused by a defective weld that is applied to close off the tank.

The leak’s cause has been identified and a new weld performed, Le Gall said. Tests to confirm the new weld’s integrity are underway and, assuming no problems, will be completed in time to ship the instrument to the United States in the first week of January. It will then be integrated into the InSight lander in preparation for the March launch.

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A new technique for creating diamonds

8:54 am

In discovering a new solid state for carbon scientists have also discovered that it is a relatively inexpensive way to produce diamonds.

Professor Jay Narayan of North Carolina State University is the lead author of three papers describing the work that sees Q-carbon join the growing list of carbon solids, a list that includes graphite, graphene, fullerene, amorphous carbon and diamond. He has suggested that the only place Q-carbon might be found in the natural world is in the core of certain planets.

The researchers created Q-carbon by starting with a thin plate of sapphire (other substrates, such as glass or a plastic polymer, will also work). Using a high-power laser beam, they coated the sapphire with amorphous carbon, a carbon form with no defined crystalline structure. They then hit the carbon with the laser again, raising its temperature to about 4,000 Kelvin, and then rapidly cooled, or quenched, the melted carbon. This stage of quenching is where “Q” in Q-carbon comes from.

The researchers have found that, depending on the substrates, tiny diamonds will form within the Q-carbon, suggesting to me that they have actually discovered how diamonds are formed deep below the Earth. The hot high pressure environment there allows Q-carbon to naturally form, and in the process of its solidification diamonds are a byproduct.

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Success at last for Akatsuki

8:45 am

Five years after the Japanese Venus probe Akatsuki’s main engines failed while trying to put it into orbit, the spacecraft today fired its attitude thrusters and was successfully inserted into orbit.

This is a singular achievement by the Japanese engineers running the mission. They improvised a plan using the thrusters, which were designed to adjust the spacecraft orientation, not its course, and were able to get Akatsuki in an solar orbit that brought it back to Venus.

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Russia has another launch failure

8:37 am

In the heat of competition: Russia today confirmed that its Saturday launch of a military satellite failed when the satellite did not separate from the Soyuz rocket’s upper stage.

For most of the weekend Russian news sources were claiming that the satellite had been inserted into its proper orbit. One source however had correctly noted the failure. Because of the contradiction I had held off posting on this. Now that the failure is confirmed, it reveals again what seem to be chronic quality control problems within the Russian aerospace industry. They fix problem one place and another pops up somewhere else.

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