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Fwd: Re: Floor Vibration[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: wai(--nospam--at)euken.com
- Subject: Fwd: Re: Floor Vibration
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 04 Aug 1997 15:43:48 GMT
>On Sun, 16 Mar 1997, R K Hagens, P.E. wrote: > >> Does anyone know of a technical guide or resource for designing or >> retrofitting buildings with floor vibration control problems? I have a >> client that wants to install a VERY sensitive device that requires >> vibration amplitudes be limited to 1 micron or less at a frequencies of 5 >> Hz or greater. > >R.K., >We get requirements like that fairly regularly here at Lawrence Berkeley >National Lab. The solution seems to be in isolating the EQUIPMENT. Even >when we build a brand new building to house such equipment (typically >electron microscopes) we design isolation for the equipment. I don't >recall EVER retrofitting the building itself. Vibration isolation systems >are usually just the opposite of good seismic design, so it can be a >challenge. >Bob > >. . . . . . . . . . . . . ........................... >Bob Shilling, SE Berkeley, CA shilling(--nospam--at)emf.net We, too are designing vibration isolation systems for the semiconductor industry. SEMs are just one type of equipment that you have to deal with. Fortunately most of the buildings in Silicon Valley have been designed with "vibration in mind". But Bob Shilling is right that it is much easier and cheaper to isolate the tool (passive or active isolation systems) than do the structural modifications to the buildings. It is quite time consuming task to design the active isolation system. If the floor vibration is whithin the spec, than there you are OK (assuming that your tool sits directly on the floor). You would also need a little more specific vibration spec (is it p-p, 0-p or RMS). But whichever way you go, first thing that you need to do is to hire a vibration consultant to measure the vibrations at the site. Let me know if you need any names. Sasha Itsekson Huntigton Design Associates Oakland, CA Engineers(--nospam--at)HuntingtonDesign.com --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [126.96.36.199]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id MAA09918 for <rlewis(--nospam--at)techteam.org>; Mon, 17 Mar 1997 12:45:22 -0600 (CST) Received: from astsoft.com by server1.seaoc.org (NTList 3.02.10) id xa009669; Mon, 17 Mar 1997 10:33:08 -0800 Received: from hdesign.astsoft.com (port17.astsoft.com [188.8.131.52]) by doorstop (8.6.12/8.6.9) with SMTP id KAA16708 for <seaoc(--nospam--at)seaoc.org>; Mon, 17 Mar 1997 10:30:54 -0800 Date: Mon, 17 Mar 1997 10:30:54 -0800 Message-Id: <184.108.40.206.19970317103316.27576cae(--nospam--at)bayweb.net> X-Sender: seaoc-ad(--nospam--at)seaoc.org X-Mailer: Windows Eudora Light Version 1.5.4 (16) Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" To: seaoc(--nospam--at)seaoc.org From: Alexander Itsekson <engineers(--nospam--at)huntingtondesign.com> Subject: Re: Floor Vibration Reply-To: seaoc(--nospam--at)seaoc.org Error-To: seaoc-ad(--nospam--at)seaoc.org X-Loop: seaoc(--nospam--at)seaoc.org X-Info: [SEAOC] Owner: seaoc-ad(--nospam--at)seaoc.org X-POP3-Rcpt: seaoc-ad(--nospam--at)seaoc.org Precedence: list X-ListMember: rlewis(--nospam--at)techteam.org [seaoc(--nospam--at)seaoc.org] __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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