Path: utzoo!attcan!uunet!lll-winken!brutus.cs.uiuc.edu!apple!sun-barr!newstop!sun!lightsabre!kenobi
From: kenobi%lightsabre@Sun.COM (Rick Kwan)
Newsgroups: sci.space.shuttle
Subject: Re: ``frequency tests''
Message-ID: <123214@sun.Eng.Sun.COM>
Date: 24 Aug 89 17:13:19 GMT
References: <1862@salgado.Solbourne.COM>
Sender: news@sun.Eng.Sun.COM
Reply-To: kenobi@sun.UUCP (Rick Kwan)
Distribution: na
Organization: Sun Microsystems, Mountain View
Lines: 19

In article <1862@salgado.Solbourne.COM> dworkin@Solbourne.COM (Dieter Muller) writes:
>What exactly is an ``engine frequency response test''?  From context, I
>assume it has something to do with the speed at which various controls
>can be operated, but that doesn't sound right.

If anyone cares to contradict me, send me some mail.  What follows
is based on some reading of eons ago about some other project.

An engine has a certain natural frequency.  Varying its thrust will
cause it to vibrate at varying frequencies.  If the thrust-induced
frequency hits the natural frequency, the engine stands a chance of
flying apart.

	Rick Kwan (aka Obi-Kwan Kenobi)
	Sun Microsystems - Intercon
	kenobi@sun.COM
	Rick Kwan (aka Obi-Kwan Kenobi)
	Sun Microsystems - Intercon
	kenobi%lightsabre@sun.COM