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Submission + - An engineering analysis of the Falcon 9 first stage landing failure

schwit1 writes: Link here.

SpaceX founder and chief technology officer Elon Musk tweeted that "excess lateral velocity caused it [the booster] to tip over post landing." In a later tweet that was subsequently withdrawn, Musk then indicated that "the issue was stiction in the biprop throttle valve, resulting in control system phase lag." In this statement, Musk was referring to "stiction" — or static friction — in the valve controlling the throttling of the engine. The friction appears to have momentarily slowed the response of the engine, causing the control system to command more of an extreme reaction from the propulsion system than was required. As a result, the control system entered a form of hysteresis, a condition in which the control response lags behind changes in the effect causing it.

Despite the failure of the latest attempt, SpaceX will be encouraged by the landing accuracy of the Falcon 9 and the bigger-picture success of its guidance, navigation and control (GNC) system in bringing the booster back to the drone ship. The GNC also worked as designed during the prior landing attempt in January, which ended in the destruction of the vehicle following a hard touchdown on the edge of the platform.

AI

Submission + - Neuromorphic Algorithms Allow MAVs to Avoid Obstacles with Single Camera (ieee.org)

aurtherdent2000 writes: IEEE Spectrum magazine says that Cornell University has developed neuromorphic algorithms that enable MAVs to avoid obstacles using just a single camera. This is especially relevant for small and cheap robots, because all you need is a single camera, minimal processing power, and even more minimal battery power. Now, will we see more of the drones and aerial vehicles flying all around us?

Link from Voice of America: http://www.voanews.com/content/robot_smart_bird/1538352.html

Books

Submission + - Best Science Fiction/Fantasy for 8 Year Olds 7

Jason Levine writes: My son is 8 years old. I'd love to get him interested in Science Fiction, but most of the books I can think of seem to be targeted to older kids/adults.

Thinking that the length of some novels might be off-putting to him, I read him some of the short stories in Isaac Asimov's "I, Robot". He liked these but I could tell he was having a hard time keeping up. I think the wording of the stories was too advanced and there was too much talking and not enough action. Personally, I love Asimov, but I think much of it just went over his head.

Which science fiction and/or fantasy books would you recommend for an 8 year old? (Either stories he could read himself or that we could read together over the course of a few weeks.)

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