/sci/ - Science & Math

>>7688257
what are you studying

>>7688244
currently 12 with 2 advisors

we are trying to get our former members back on the team

>>7642968
No, it's only the fans and the compressors we want, read >>7642431
>>7642530
Not the test tube, no. But the ideal tube is hypothesized to be. So we can cancel the windows as you've said

guys btw

anyone have any idea where we can order turbofans + compressors without the combustion engine?

the business is completely build on a b2b model which is logical, but we have electrical motors to get the fans and compressors working

currently spamming emails to suppliers but i'm not even sure if that would be helpful

>>7641658
thanks for the friendly bump m8

have a compressor render

>>7639149
I've learned about a very interesting thing about technology history when reading into tubes. Apparently, pneumatic tubes were a thing in 1800s where people pumped their mails back and forth, to create a pseudo-internet back in the day. People were BLOWN AWAY by this, there are articles in newspapers speaking about how "the future will be pneumatic", raving about the tubes how we do about the internet. Then phones and cargo trucks came, and pneumatic tubes became a thing of the past.

pic related - a pneumatic mail container

here's a smithsonian article about it
http://www.smithsonianmag.com/innovation/hyperloop-latest-innovation-pretty-much-series-of-tubes-180955735/?no-ist

>>7638540
Thanks for your support m8, but it was rather unfortunate that the initial group broke up. We didn't have a single Aero guy on our team which stalled the design process and got people demotivated. It's natural, everyone's doing it voluntarily and this is an online group, so people drift apart easily.
Funny thing is, schools began and now we have more Aero guys than we ever needed.
If you from Sci-X are reading this, love you guys, best of luck in your affairs. Also you can get back anytime you like

bump

>>7634638
needs the compressor at the front to eliminate the piston effect

>>7634567
oh btw, Arx Pax is endorsed by Hyperloop Competition Committee. In fact we've got to know them thanks to an email forwarded to group leads

>>7634567
>Did you just make a maglev instead of a hyperloop?
it's allowed, but this is a hover engine/air bearing combo not a maglev
from the tube spec:
>The test track has been designed to be flexible and to allow competitors to implement, at a minimum, the following three types of levitation/suspension:
>1. Wheels: The concrete (and aluminum) flat sections along the outside allow for a good wheel surface and aluminum rail(s) allow for horizontally oriented wheels, as implemented on certain roller coasters.
>2. Air Bearings: The aluminum plate allows for a much smoother and flatter surface than the steel tube itself. The rail(s) can be used for lateral control, either through side-mounted bearings or wheels.
>3. Magnetic levitation: Several forms of magnetic levitation require a conductive non-magnetic surface (e.g. copper or aluminum). The sub-track allows for magnetic levitation and the rail(s) allow for lateral control.
it's fine as long as it's not fully on wheels

>Did you do any cost analysis on this whatsoever
Arx Pax commercially available hover engines are $10k apiece, given 16 of them are there, with a special discount for hyperloop teams, should put the price tag to $100k, however reducing the number of air bearing skis by 70% - currently the offer from an air bearing firm
> Fuck you aren't even allowed to modify the
oh yes i am
>IE what is the heat flux into the pod
comes after the determination of compressors to be used, shouldn't sweat it given our tendency to stick to proven and available tech with lots of specs
>safety mechanisms
pretty much aircraft safeties for pod leaks, and deep water tunnel safeties for tube leaks will be proposed. same principles govern

>are you a youknowwho employee by any chance?
>>7634571
pls elaborate

Sneaki Peaki

Bump

>>7632367
>The total levitation payload
Capacity*

>>7631944
>also how heavy is your whole setup?
we haven't done an exact assessment of the weights but you may assume it's around 1.5 tonnes
>how much lift can the magnets provide?
each hover engine has a payload of 48 kg, and they come in packs of 4 engines. Every bogie is fitted with these 4 engines, and there are 4 bogies, giving the maximum hover engine payload = 768 kg. In addition, the system will be fitted with air bearings, each having a carrying capacity of 217 kgs, paired and arrayed in 4, giving them a total capacity of 1736 kgs. The total levitation payload is around 2.5 tonnes.
>what is the opening diameter of your compressor?

>how much lift can it provide?
see above. the white paper proposes only air bearings for lift.
>>7632017
Obviously so, but SpaceX announced a steel tube
>>7632128
There's a NASA analysis that highlights the choke flow you've mentioned, with is coupled to the bypass flow around the pod. Pic related
>The Hyperloop passenger pod was decomposed into five analyses that were connected to form the conceptual sizing model.
>4. Tube Flow Limitations: Pod speed limitations based on choked flow restrictions.
>However, in order to achieve reasonable eciency from the compression system, the Mach number of the flow at the compressor face must be limited to less than about 0.65. For Mpod greater than 0.65, a diffuser must be added to the Hyperloop which will slow the air down before it enters the compressor.
The diffuser mentioned above is probably what you mean by variable geometries.
Basically NASA pulls down the top speed given down by SpaceX while doubling the tube size. Since the SpaceX tube dimension specs are not adhering to this change in diameter, we've thought about increasing the bypass pressure by adding an extra compressor, with a larger diameter, thus providing a high by-pass flow as seen in the pic here >>7628900

Question: should we scrap the additional compressor? If we should keep it, should we size it down instead?

Pic related, we're going to put one of these bad boys to the front (only axial compressor minus the combustion chamber & turbine), covering about 85% of the entire tube cross-section, thus allowing our secondary compressor to work at transonic speeds

Bump

bump

>>7630710
forgot pic

>>7630410
I should've clarified better:
The guidance track and the plates at the bottom are provided by default to competitors by SpaceX. We're only expected to design the pod.
Pic related: tube spec drawing
>The test track will be an approximately 1-mile-long steel tube with a 6-foot outer diameter, fitted with an aluminum sub-track and rail mounted to a concrete fill bed. At the tube’s egress door, there is a 12-foot-long “foam pit” to help mitigate the {hopefully non-occurring} case of a Pod braking system failure. The tube sections will rest on concrete cradles, reinforced with steel and fitted with PTFE slip bearings.
>The parameters of the Hyperloop test track are:
>Material: ASTM A1018 Grade 36
>Outer diameter: 72.0 inches
>Inner diameter: 70.6 inches
>Wall thickness: 0.70 inches
>Length: 1 mile (approximate)
>Subtrack material: Aluminum 6101-T61
>Subtrack roughness: 125 RMS with potential for occasional surface scratches up to 0.008”
>Subtrack thickness: 1.0” for first and last 200 feet; 0.5” for remainder of tube
>Rail Material: Aluminum 6061-T6
>Internal Pressure: 0.02 – 14.7 PSI

bump