X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 929254 for flyrotary@lancaironline.net; Mon, 16 Jan 2006 21:25:11 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=bobperk@bellsouth.net Received: from ibm57aec.bellsouth.net ([65.1.105.100]) by imf17aec.mail.bellsouth.net with ESMTP id <20060117022426.PVPE23346.imf17aec.mail.bellsouth.net@ibm57aec.bellsouth.net> for ; Mon, 16 Jan 2006 21:24:26 -0500 Received: from HpPavilion310n ([65.1.105.100]) by ibm57aec.bellsouth.net with ESMTP id <20060117022425.JIVP8357.ibm57aec.bellsouth.net@HpPavilion310n> for ; Mon, 16 Jan 2006 21:24:25 -0500 From: "Bob Perkinson" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: shake, rattle and hum Date: Mon, 16 Jan 2006 20:24:23 -0600 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0106_01C61ADA.D6FA5300" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0106_01C61ADA.D6FA5300 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit Rusty, I am by no means an expert in vibration analyses, but I have been witness to some unusual vibration events involving steam turbines. In one event a piece of dismantled turbine (60,000 Lb) was set on the independent foundation of an operating steam unit. The shaft vibration on several of the bearings went down. Everyone watching this thought "Hay this ant bad" so when they decided to temporarily store another piece of the dismantled turbine weighing in at 45,000 Lb on the same foundation, no one gave it a second thought until the vibration on the in service turbine jumped up to almost twice what it was previously running. So I guess what I was trying to say was that stationary weight can have as much effect on the vibration as can the rotating weight Bob Perkinson Hendersonville, TN. RV9 N658RP Reserved If nothing changes Nothing changes ------=_NextPart_000_0106_01C61ADA.D6FA5300 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Rusty,
I am by no=20 means an expert in vibration analyses, but I have been witness to some = unusual=20 vibration events involving steam turbines.  In one event = a piece=20 of dismantled turbine (60,000 Lb) was set on the independent=20 foundation of an operating steam unit.  The shaft vibration on = several of=20 the bearings went down.  Everyone watching this thought "Hay this = ant=20 bad"  so when they decided to temporarily store another piece of = the=20 dismantled turbine weighing in at 45,000 Lb on the same = foundation,  no one=20 gave it a second thought until the vibration on the in service turbine = jumped up=20 to almost twice what it was previously running.  So I guess what I = was=20 trying to say was that stationary weight can have as much  effect = on the=20 vibration as can the rotating weight 

Bob Perkinson
Hendersonville, TN.
RV9 N658RP=20 Reserved
If nothing changes
Nothing = changes
 

 
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