From: John Walmsley (jwalmsley2@yahoo.com)
Date: Mon Feb 24 2003 - 14:44:08 EET
Big ones have low pitches, little ones have high pitches. This method of analysis has never failed me.
JW
Chris Sutcliffe <c.j.sutcliffe@liverpool.ac.uk> wrote:Dear list OK here goes....I know little about modal analysis apart from what it is and a small amount of experience with vibration modes of a cantilever beam demonstrated to my students. A quick google search with the term "modal analysis"+bells has however revealed that I am an expert :-) because I am now aware that modal analysis of bells has been studied by Liang Shen under the supervision of Dr. Yijun Liu, Associate Professor of Mechanical Engineering at the university of cincinatti .....check it out at http://urbana.mie.uc.edu/yliu/Showcase_FEA/Bell_Analysis/Bell.htm looks like they've done a great job. there's also lots of other stuff out there as well. As for software I used the FEA extension of Unigraphics but I'm sure there are lots of other softwares to do this it's just that I don't know which ones to recommend......perhaps I'm not such an expert after all. :-( Best regards Chris
Dr. Chris Sutcliffe
Rapid, Micro and Bio Manufacturing Research
MSERC
The University of Liverpool
Department of Engineering
Ashton Building
Brownlow Hill
Liverpool
L69 3GL
Tel. (0151) 794 4316
Fax. (0151) 794 4703
Mobile (0151) 794 7729
Email c.j.sutcliffe@liv.ac.uk
URL http://mserc.liv.ac.uk/
-----Original Message-----
From: Greg Pettengill [mailto:gpetteng@bellsouth.net]
Sent: 23 February 2003 18:00
To: RP-ML; Chris Sutcliffe
Subject: Re: Determining the Pitch of Bells
Hi Chris, If it is okay with you and would not mind me "picking your brains" in public, I would like to share our conversation with the entire list. Is there a particular FEA software package that you would recommend for this type of application? If so, why? Are there alternative methodologies that I could use? Best Regards
Greg Pettengill
Cote' Art & Engineering
321-269-7587----- Original Message ----- From: Chris Sutcliffe To: Greg Pettengill Sent: Sunday, February 23, 2003 8:18 AMSubject: RE: Determining the Pitch of Bells
Dear Greg Why don't you try some modal analysis using an FEA package. This should give you the principle modes and frequencies of the vibrations allowing you to predict the effects of your design on the acoustic performance of the bells. Best regards
Dr. Chris Sutcliffe
Rapid, Micro and Bio Manufacturing Research
MSERC
The University of Liverpool
Department of Engineering
Ashton Building
Brownlow Hill
Liverpool
L69 3GL
Tel. (0151) 794 4316
Fax. (0151) 794 4703
Mobile (0151) 794 7729
Email c.j.sutcliffe@liv.ac.uk
URL http://mserc.liv.ac.uk/
-----Original Message-----
From: owner-rp-ml@rapid.lpt.fi [mailto:owner-rp-ml@rapid.lpt.fi]On Behalf Of Greg Pettengill
Sent: 23 February 2003 04:32
To: RP-ML
Subject: Determining the Pitch of Bells
Dear RPML, I was hoping that someone might be able to help me with a problem I'm trying to solve. I am designing cast metal bells in different sizes. And need to calculate what their pitch will be relative to their size. Even though this is a new design and not a conventional bell shape I thought that it may be possible to make a reasonably close estimate. Perhaps by extrapolating data obtained from testing a series of scale models. Best Regards
Greg Pettengill
Cote' Art & Engineering
321-269-7587
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