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Evolved antenna

en.wikipedia.org

31–40 of 69 posts

Re: Evolved antenna

#31
post #25
post #6

Interesting to see this antenna here. I heard the creator speak at a local IEEE event a few years ago. Quite remarkable. Nobody would intuit an antenna design like that. Great demonstration of the power of GA. Antenna optimization software has changed antenna design completely. Before wide-spread computer simulation, there was an awful lot of antenna range cut-and-try. Antennas are much better now. Learning to drive…

Are the software radiation simulations accurate? Are they based on solving complex physics formulas?

They're typically done by splitting the antenna up into infinitesimal pieces, then summing up all the effects. Like a 3D integral.

Re: Evolved antenna

#32
post #7

Reminds me of an old article about evolutionary circuit design. The computer was tasked with creating a osscilator using physical hardware. It created a really complex and unconventional design that no-one understood, but it worked, only not work outside of the lab. As it turned out the algorithm had designed it in a way that it used the radio noise from the computer it was running on as a source. It had effectively…

Cf. "The Surprising Creativity of Digital Evolution: A Collection of Anecdotes from the Evolutionary Computation and Artificial Life Research Communities"

https://arxiv.org/abs/1803.03453v1

> Biological evolution provides a creative fount of complex and subtle adaptations, often surprising the scientists who discover them. However, because evolution is an algorithmic process that transcends the substrate in which it occurs, evolution's creativity is not limited to nature. Indeed, many researchers in the field of digital evolution have observed their evolving algorithms and organisms subverting their intentions, exposing unrecognized bugs in their code, producing unexpected adaptations, or exhibiting outcomes uncannily convergent with ones in nature. Such stories routinely reveal creativity by evolution in these digital worlds, but they rarely fit into the standard scientific narrative. Instead they are often treated as mere obstacles to be overcome, rather than results that warrant study in their own right. The stories themselves are traded among researchers through oral tradition, but that mode of information transmission is inefficient and prone to error and outright loss. Moreover, the fact that these stories tend to be shared only among practitioners means that many natural scientists do not realize how interesting and lifelike digital organisms are and how natural their evolution can be. To our knowledge, no collection of such anecdotes has been published before. This paper is the crowd-sourced product of researchers in the fields of artificial life and evolutionary computation who have provided first-hand accounts of such cases. It thus serves as a written, fact-checked collection of scientifically important and even entertaining stories. In doing so we also present here substantial evidence that the existence and importance of evolutionary surprises extends beyond the natural world, and may indeed be a universal property of all complex evolving systems.

Re: Evolved antenna

#33
post #25

Earlier quoted context omitted.

Are the software radiation simulations accurate? Are they based on solving complex physics formulas?

Well..... for some definition of accurate. For large antennas with thin structures, the typical solver is "Method of Moments". NEC2 was developed by the government and is public domain. It is quite popular, and does some things well but it is also easy to stumble into modeling bugs/deficiencies, and isn't much use above high UHF. But is very useful if you know how not to step in the bugs, and is free. NEC4 falls unde…

That's the exact same trick you use to determine model granularity when using finite element analysis for construction purposes. It is actually quite surprising how coarse models can be and still give useful answers.

Re: Evolved antenna

#34
post #7

Reminds me of an old article about evolutionary circuit design. The computer was tasked with creating a osscilator using physical hardware. It created a really complex and unconventional design that no-one understood, but it worked, only not work outside of the lab. As it turned out the algorithm had designed it in a way that it used the radio noise from the computer it was running on as a source. It had effectively…

Was it Creatures From Primordial Silicon? http://www.netscrap.com/netscrap_detail.cfm?scrap_id=73 They used a FPGA for voice detection. It was fascinating they didn't understand how it worked, and it wasn't a universal design because it depended on manufacturing variation.

I read about the same research in an article in Discover Magazine: http://discovermagazine.com/1998/jun/evolvingaconscio1453

Re: Evolved antenna

#35

Earlier quoted context omitted.

Was it Creatures From Primordial Silicon? http://www.netscrap.com/netscrap_detail.cfm?scrap_id=73 They used a FPGA for voice detection. It was fascinating they didn't understand how it worked, and it wasn't a universal design because it depended on manufacturing variation.

I read about the same research in an article in Discover Magazine: http://discovermagazine.com/1998/jun/evolvingaconscio1453

This article is what made me decide to major in CS. I very much remember reading it in my high school library during the final few days before graduation. Every time I see it mentioned somewhere I get that feeling . . . not quite nostalgia, but a reminder of why I love what I do.

Re: Evolved antenna

#36
Skipper: "Professor, why did our rescue radio fail?"

Professor: "Hmmm, it looks like somebody straightened out the antenna. It had an unusual shape for a reason."

Skipper: "Giillligan?! Do you know anything about this antenna?"

Gilligan: "Uh, I'm sorry guys, the antenna looked all bent up, so I straightened it. See how nice it looks now?"

(They both bop Gilligan on the noggin.)

Re: Evolved antenna

#37
post #25

Earlier quoted context omitted.

Are the software radiation simulations accurate? Are they based on solving complex physics formulas?

Well..... for some definition of accurate. For large antennas with thin structures, the typical solver is "Method of Moments". NEC2 was developed by the government and is public domain. It is quite popular, and does some things well but it is also easy to stumble into modeling bugs/deficiencies, and isn't much use above high UHF. But is very useful if you know how not to step in the bugs, and is free. NEC4 falls unde…

Sounds like there's some manual steps to create the simulation. I'm wondering how these genetic algorithms can automatically feed into the simulation and get back a single number to drive the GA fitness function.

Re: Evolved antenna

#38
post #7

Reminds me of an old article about evolutionary circuit design. The computer was tasked with creating a osscilator using physical hardware. It created a really complex and unconventional design that no-one understood, but it worked, only not work outside of the lab. As it turned out the algorithm had designed it in a way that it used the radio noise from the computer it was running on as a source. It had effectively…

Adrian Thomson’s work

Re: Evolved antenna

#39

Earlier quoted context omitted.

maybe this? https://www.damninteresting.com/on-the-origin-of-circuits/ ive re-read that piece dozens of times, the implications are fascinating.

There's a reason that conventional design uses models that abstract away the particulars -- in this case the evolved solution isn't robust to process variation in the FPGA. It's really easy for optimization to exploit irrelevant details to give you designs that aren't very useful. I'm no skeptic when it comes to EAs -- I did my dissertation using them, and I've subsequently written one of my own -- but you have to ha…

Are you aware of anyone who has recreated the process, except with a large pool of different FPGAs from different manufacturers and running designs on a random one each time?

I'd imagine with even a moderate pool (~10?) the variation falls away and you're left with a robust design, although the process will take significantly longer.

Re: Evolved antenna

#40
> This sophisticated procedure

evolutionary algorithms are anything but sophisticated. i love them, but sophisticated they are not.

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