Margaret Hamilton, the woman who wrote code that guided the Apollo missions to the Moon, has passed away. RIP
www.technologyreview.com/2019/08/16…
#Space #MargaretHamilton #Apollo #Moon #NASA #women #womeninstem
Matteo Ceriotti
@mtcerio.mastodon.social.ap.brid.gy
16 followers 3 following 133 posts
Rocket scientist 🚀 (#space systems #engineer) at University of Glasgow 🎓 - Content and opinions my own. #Science #Engineering #STEM #Skepticism Born in #Italy […] 🌉 bridged from ⁂ mastodon.social/@mtcerio, follow @ap.brid.gy to interact
![Abstract:
The preliminary stage of space mission design often requires evaluating a large number of orbital transfers. This is especially the case for multi-target missions, where a combinatorial problem involving millions of orbital transfers must be solved. Existing techniques for calculating the cost of each transfer are time-consuming, so can render the combinatorial problem intractable. [ ... ]This work addresses the scenario where a number of spacecraft models, each with its own thrust, specific impulse and mass, need to to analysed for a mission. Normally, this would involve creating a large database and training a different ANN for each spacecraft. In the proposed approach, an ANN is trained on one spacecraft (acting as a ‘baseline’), and fine-tuned on smaller databases for each other spacecraft. It is shown that, if a sufficiently good accuracy can be obtained on the baseline database, the fine-tuning approach requires fewer training samples to achieve a given accuracy than if an entirely fresh model were trained, and saves time on the hyperparameter tuning required to construct a fresh model. Therefore, we propose to train an ANN once on a baseline spacecraft, then transfer this knowledge to an arbitrary number of other spacecraft by fine-tuning the baseline ANN.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:hag5f7qrkhu2smafxizonaau/bafkreif7dpnadtqbd2gp6i2ftw3nvyqyt5shgop7wmh7fqrisdmvec2chu)