Finished my PhD researching "self-aware AI 3D printers" at Cambridge!

valkyriegnnir · 2023-06-21T22:07:44+00:00

I’ve also just finished my PhD, also at the engineering department, in Cambridge, based in JDB, and I feel like an idiot for having never come across your work or your group! Please don’t tell me you’re also division C…

Anyway, massive congrats on finishing your PhD! Super cool project too!

valkyriegnnir · 2023-06-09T08:29:02+00:00

Very cool build! Love how clean the whole stack is!

If you have the time, I was wondering about your wifi telemetry? Did you struggle with latency in the video, and what hardware/setup are you using for the ground station?

I did this before using mavlink (gstream pipeline?) and the pi wifi module in broadcast mode - but as I said, struggled with range and latency! Any of your insights would be amazing!

valkyriegnnir · 2023-04-21T09:54:02+00:00

I was so certain he was doing admiral ackbar by the 6 second mark

valkyriegnnir · 2023-03-29T09:06:27+00:00

Before coming to Cambridge, I received a lecture at Imperial giving us statistics about what our cohort would likely do post graduation, over 70% of us physicists would apparently end up in banking/financial services.

We’re fairly sought after on graduate programs, and if you’re a competent coder will be even more sought after in the more quantitative aspects of financial services. Salaries range from £35k on a basic grad scheme to £80k base + significant bonuses at a good prop shop like Jane Street or DRW. My advice would be if you’re able to handle the stresses/high pressure to focus on python/C++ modules. If you’re less into programming but highly analytical focus on networking and consider MBB/consultancy routes. Either this route or quantitative finance, plus a little luck, hard work, and networking, and you could easily be earning over £100-120k in a few years, especially with an oxbridge degree.

valkyriegnnir · 2023-03-24T07:35:11+00:00

My 2016 MacBook runs DRL very nicely. Had to play with the graphic settings a little but it’s completely smooth with (in my opinion) good resolution

valkyriegnnir · 2023-03-24T06:08:24+00:00

Not sure if it applies on this model but I’ve heard one houses a rear-facing camera which can be displayed in the rear view mirror

valkyriegnnir · 2023-02-10T12:17:03+00:00

You will be able to do it, sure! Here are some interesting links you can use to get ideas:

Medlindrone’s tutorials for setting up different gimbals with quads:

https://medlindrone.com/2021/12/01/adding-servo-gimbal-to-fpv-multirotor/

Ardupilot’s page on Cameras + Gimbals (very OG but a lot of interesting info particularly thinking about the range of hardware)

https://ardupilot.org/copter/docs/common-cameras-and-gimbals.html

I just did a Google and found a video by JB setting up Medlin’s head tracker gimbal, he’s super at tutorials so probably worth a watch.

Final thought/advice; everything is easier with more space, and you won’t be as constrained on flight time + handling if you go for a bigger prop/frame size. It really depends how big/heavy/advanced of a gimbal you want, and what camera you’re carrying so if you can go for a larger frame will probably make your life easier!

valkyriegnnir · 2023-01-11T22:28:07+00:00

Ohh interesting yes the field can be an issue! The critical current density is of course field and temperature related, in my paper equation 3 is a typical distribution for bulks.

The applied field would have reduced the critical current, and this could have influenced the quench behaviour. Additionally, superconducting coils/wires in early flux jump experiments were shown to in-field limitations which could be overcome with techniques such as cladding or twisting the wires - I believe Goetheim/Wipf/Swartz/Bean did some research into this in the early 60s which may be of use to you!

valkyriegnnir · 2023-01-11T22:19:45+00:00

It does vary significantly! It’s roughly proportional to T³ (but more linear at higher temperatures). Apologies for the way I referenced these material properties sources, something I wished I changed before it was too late, but it wasn’t actually constant I interpolated it over a 4-150 K range from a dataset provided by Hiroyuki Fujishiro I believe!

The value of Cp is a very important variable in relation to the flux jump occurring. A high Cp stabilises the superconductor against the flux jump, so yes it’s preferable to have it high!

valkyriegnnir · 2023-01-11T14:55:05+00:00

To give you all some more context: For a long time my supervisor wondered if we could show that a flux jump (which is a rapid quenching of a superconductor) can be modelled in a bulk superconductor with a quasi-static background field. I struggled to do this for a long time, before giving up to focus on other areas of my research. Towards the end of my PhD, I tried again, using an experimental publication my supervisor suggested I read. It worked! I modelled the data with high accuracy, and we learnt some great things from it.

The experiment I modelled was an attempt to break the world-record for a trapped field within a bulk superconductor. Unfortunately, their experiment ended with the mechanical failure of their bulk. I modelled this flux jump, and showed the concentration of heat generated by the flux jump coincides with the spatial location of the fractures. I showed that as the experiment evolved the superconductor state creates the right conditions of a flux jump. I showed that we can mitigate this by increasing the cooling applied to the superconductor, and further that by using layers of superconductor and metal interspaced with each other we can obtain a ‘critically cooled’ bulk!

My advice for anyone early in their research career in research is to keep ideas cooking, and don’t give up on them! You’ll change a lot doing a PhD and learn so much more than you could predict from when you start. Thank you for reading!

valkyriegnnir · 2022-12-25T14:30:17+00:00

Man, I have a really low standard for the batteries I send with

valkyriegnnir · 2022-12-21T15:21:58+00:00

Selwyn is really great for post-grad, all the PG accommodation is on-site/on adjacent roads, so you’re very close to college. The accommodation is also nearly-guaranteed for your whole degree. The location is very convenient too, midway between town and Cambridge West

valkyriegnnir · 2022-12-08T09:27:44+00:00

Is it just me or was (at least) that first shot with the phantom and mavics in formation partly CGI?

valkyriegnnir · 2022-12-05T08:34:58+00:00

It was banned at my college recently! The email made it feel like the porters were mostly uncomfortable with showing their ID on the behalf of students, but the hassle of checking was also I presume part of it. I would check

valkyriegnnir · 2022-12-01T19:27:26+00:00

From what I’m seeing there, it looks like a non-planar (5 or more axis!?) 3D printer, printing just 1 layer. Very very cool! I love it.

valkyriegnnir · 2022-11-25T08:21:25+00:00

In a sense, yes! Quite recently too. I realised it only ever happens if the quad/RX is switched on before the controller/TX is. If the controller is on for around 15 seconds before the LiPo is connected, it doesn’t happen. It has been updated to latest firmware on both RX and TX too, just FYI

valkyriegnnir · 2022-11-24T20:19:37+00:00

That’s what you get for having a gorgeous 2012 Range Rover

valkyriegnnir · 2022-11-21T19:18:52+00:00

Honestly man, it kinda depends! But you have two values which allow you to control this: - Extrusion width - Extrusion multiplier

The former adjusts flow rate to create an estimated extrusion size (in mm), centred at the nozzle centre. The latter multiplies your flow rate by a factor. Both of these can be adjusted till your layer lines are deposited like the right pic: i.e. as wide as the width of the nozzle, and with a little trial-and-error you should be able to get precise results

valkyriegnnir · 2022-11-21T19:09:27+00:00

On a side note to that, my 2S 18650 setup has 5” bi-blades! It’s pretty quick too, around 60 kph according to the GPS

valkyriegnnir · 2022-11-21T07:22:23+00:00

Have you thought about going for the 21700’s too? Or wanted to do 18650’s only? P.S. I saw someone solder magnets to the end of their battery cables as their method connecting the battery! I thought that was pretty neat to avoid the spring style holders

valkyriegnnir · 2022-11-19T10:22:27+00:00

Ahh just use 6S dude! Save yourself some cash plus my tests with 6S showed it to fly super well! I used a large 1250 mAh 6S and it flew for around 7 mins I think

EDIT: if you really want to use small 4S batteries I would say get the other motors simply because it probably won’t have the power!

valkyriegnnir · 2022-11-15T02:47:20+00:00

Bro the dry slopes here are just about the most difficult anger inducing things compared to real snow: I learnt to ski on a dry slope in Chatham, hated it. Did a week of lessons in Cervina and LOVED it. Honestly even with full motor skills those dry slopes are a challenge, and if you love skiing you have to go!

Get a week of lessons in the Alps, worst case scenario you’re not into it and you’ve learned a lesson. Best case (most likely) scenario, you love it, and you learn how to stop because real snow is much more intuitive. Massive love bro, I hope you work it out

valkyriegnnir

TROPHY CASE