Subj : Re: Kerosene Engines
To   : Andrey Kanunnikov
From : Charles Radley
Date : Wed Jul 26 2000 12:30 am

-=> Andrey Kanunnikov wrote to Charles Radley <=-


 AK>> This scheme of control is well when the space shuttle is
 AK>> operated simultaneously. But what will happend if the
 AK>                continuosly (or continuolly - i don't
 AK> remember this word clear. I mean that the control proceeds
 AK> all the time without any breakes)

The language here is rather technical, not normal English.  Sometimes
you can say "Real-time dynamic control system"  which will describe
what you mean.

This you might find interesting:

The world's first and best experts in real-time dynamic control
algorithms are RUSSIAN.

The first works on the subject were developed by the following people:

  Pontryagin (optimal control)

  Markov (classical control theory)

  Chebychev (special polynomials)

  Lyapunov (non-linear control)

 I studied some control theory at university in Britain, and I was taught the
 theories of these people.   Practically nobody in the west published anything
 significant in these areas since Isaac Newton invented calculus.

 There are still a lot of people in Russia who have an excellent understanding
 of this subject.   It is a major reason why USSR/Russia succeeded to launc the
 world's first satelite - Sputnik-1.   I discussed some of these theories with
 representatives of a large America rocket company, and I foudn they had a
 rather poor understanding of the subject.

 This is something Russia can truly be proud of, a major contribution to
science
 of the world.

 AK>> trajectory changed unexpected?
 AK>> Time delay between signal transmitted to the Earth and recieved
 AK>> is to long.
 CR> Andrey, the method I described was not for the Space Shuttle, it was
 CR> for interplanetary craft.
 AK> I'am sorry. My english isn't well enough. I meant interplanetary
 AK> crafts.

 Actually  craft is correct for both, it is both singular and plural.
 Crafts is not a valid word !

 CR> The Space Shuttle uses on board inertial navigation methods, a closed
 CR> loop feedback control system, using multiple real-time computers.
 AK> Yes, i know about it a little. There are uses different
 AK> hyroscopes, systems of orientation control etc.

 CR> There is no human involved, except to program the computers prior to
 CR> the launch.
 AK> There are special programs checked many times and made specially for
 AK> the onboard equipment. But it's hard for me to imagine what
 AK> could be if there was a Microsoft Windows 98 for example ;-)

 Hah !  The Shuttle computer have 512 K of memory, not enough to even load
 Windows-98 !

 Chat with you soon.

 Charles R.


.... Assistant Moderator, SPACE & the 8 "SB-" prefixed echoes
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