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- From: stead@skadi.CSS.GOV (Richard Stead)
- Newsgroups: sci.energy
- Subject: Re: Flywheels and Space Stations
- Keywords: posted in sci.electronics also
- Message-ID: <51739@seismo.CSS.GOV>
- Date: 3 Jan 93 20:52:31 GMT
- References: <1338@blue.cis.pitt.edu>
- Sender: usenet@seismo.CSS.GOV
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- Nntp-Posting-Host: skadi.css.gov
-
- In article <1338@blue.cis.pitt.edu>, karol+@pitt.edu (Filip M. Gieszczykiewicz (fmgst+@pitt.edu)) writes:
- > I'm sure most folks have seen the designs for 23rd century space
- > stations - you know, the "wheel" ones. Yup, how practical would
- > it be to use the spinnin motion of some parts of the station as a
- > storage medium? From my point of view, the gyroscopic effect of
- > a giga-flywheel would be benificial because it would stabilize the
- > station and oppose all the forces like shuttles docking, folks
-
- This is a case of you can't have your cake and eat it too. Basically,
- the space station either spins for stabilization or you remove the spin
- to power the station. If you extract power from the rotation, the
- station must slow its spin. Also, it will take energy to spin the
- station up in the first place. That energy is undoubtedly easier
- stored in whatever form it was originally transported to the station
- as. May as well store it that way and use it directly, saving any
- of the conversion losses.
-
- > So, say we have a space station that NASA wants to build. During
- > the time that it is exposed to sunligh (or magnetic field or
- > whatever) motors are spinning up the flywheel which can then
- > supply power to the station either when main power fails or
- > simply as the MAIN power source.
-
- For temporary storage, I could see this working. Basically, you would
- need a no-net-torque situation; for example, a two-disk station where
- available power is used to increase the relative rotation between the
- two balanced disks, then power is drawn out when required through
- generators built into the coupling between the two disks. Such a
- coupling for operation in space would be very difficuly to design.
- Also, it would mean that the craft has a time-varying artificial
- gravity that might be difficult to cope with. Finally, any imbalances
- in the two disks could tear the station apart at the coupling (for example -
- people walking around inside, or shuttles docking).
-
- > I'm sure this beats having a breeder/fusion/fuelcell in the
-
- What's wrong with fuel cells? Or fusion power (other than the fact we
- haven't got it yet). As far as fission is concerned, it, too, is
- not a problem - space background radiation greatly exceeds anything
- one of those little space reactors produces; and stick it out on
- a simple boom, and even a meltdown (however unlikely) will cause no
- problem. Space reactors have been used for decades without any
- problems except for one Russian one that fell on Canada.
-
-
- --
- Richard Stead
- Center for Seismic Studies
- Arlington, VA
- stead@seismo.css.gov
-