Differences between revisions 3 and 6 (spanning 3 versions)
Revision 3 as of 2018-10-09 00:14:07
Size: 1220
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Revision 6 as of 2018-10-09 03:12:43
Size: 1136
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Deletions are marked like this. Additions are marked like this.
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|| RPM || radius (meters) ||
|| 1 || 3575 ||
|| 2 || 894 ||
|| 3 || 397 ||
|| 5 || 143 ||
|| 8 || 56 ||
|| 10 || 36 ||
|| 15 || 16 ||
|| 20 || 9 ||
|| 30 || 4 ||
|| '''RPM ''' || 1 || 2 || 3 || 5 || 8 || 10 || '''15''' || 20 || 30 ||
|| '''radius (meters)''' || 3575 || 894 || 397 || 143 || 56 || 36 || '''16''' || 9 || 4 ||
Line 20: Line 12:
One paper claims vestibular adaptation to 30 RPM(!) within a week, for a limited range of motion. A conservative guess is that 15 RPM will suffice for most practical needs. One paper claims vestibular adaptation to 30 RPM(!) within a week, for a limited range of motion. A conservative guess is that 15 RPM will suffice for most practical long term needs, assuming training and procedural accomodations.

Centrifuge RPM

Centrifugal acceleration and RPM versus radius. Radius is to body midline for similar head-to-foot hydrostatic pressure compared to 9.8 m/s² gravity). This neglects subtle long-term Coriolis effects, besides the obvious and well-known vestibular effects of motion in a rotating acceleration field.

a = \omega^2 R ~ so ~ R = a (gees) / \omega^2 = 9.8 / ( \pi RPM / 60 )^2 = 3575 / RPM^2 meters for one gee

RPM

1

2

3

5

8

10

15

20

30

radius (meters)

3575

894

397

143

56

36

16

9

4

One paper claims vestibular adaptation to 30 RPM(!) within a week, for a limited range of motion. A conservative guess is that 15 RPM will suffice for most practical long term needs, assuming training and procedural accomodations.

A cylinder 16 meters radius and 10 meters wide provides 1000 square meters of floor space. Three meters of polethylene shielding around that is a polyethylene volume of π (16*38² - 10*32²) m³ ≈ 10,000 m³ ≈ 9,000 tonnes of PE.

Centrifuge (last edited 2018-10-09 03:12:43 by KeithLofstrom)