PSN-L Email List Message
Subject: Re: PSN Discussion
From: John & Jan Lahr johnjan@........
Date: Wed, 02 Oct 2002 19:39:00 -0600
Dear Dr. Bauer,
Thanks for getting back to me. I'll let people know to limit their use to
sub-critical damping. Is it OK to keep a link on my web site?
At 02:52 PM 10/2/2002 -0400, Wolfgang Bauer wrote:
>I am the author of the applet. In the html file, I explicitly write that
>this is only the solution for sub-critical damping. This is all the
>applet simulates, and for all those cases the applet provides the correct
>solution. I was not interested in supercritical damping, because it would
>be too involved for the students in my class.
>The case m=k=1 and b>2 is supercritical. I should, perhaps, have written
>a warning into the applet output when supercritical cases are
>reached. For those, the applet does not work.
>On Wednesday, Oct 2, 2002, at 08:51 US/Eastern, Gerd Kortemeyer wrote:
>>Thanks for the bug report. We will look into it.
>>The question regarding usage rights has to be answered by the authors of
>>this applet, namely Profs. Wolfgang Bauer and/or Gary Westfall.
>>The applet is now part of the repository of a larger system,
>>John & Jan Lahr wrote:
>>> Gerd Kortemeyer
>>>Chris has pointed out that the Java code is not displaying things
>>>for large values of damping.
>>>We were looking at this page:
>>>Try, for example, m = k = 1 and then b = 4 and b = 8. For b = 8
>>>the return to zero is faster than for b = 4, where as it should be
>>>We found the page through google.com, so I don't know if you
>>>even intend for others to use it. We're working on seismometer
>>>design with students at the Colorado School of Mines and thus
>>>were looking at damped harmonic motion applets. See:
>>>http://www.jjlahr.com/science/psn/epics/ for what we're up to.
>>>At 05:21 PM 10/1/2002 -0400, ChrisAtUpw@....... wrote:
>>>>Hey, that was a nice applet! It shows the response for damping at
>>>>and below critical very nicely. However, there seems to be a
>>>>programming error, for high values of damping, say 4, give a MORE
>>>>rapid return to the zero line, when the TRUE response is to take
>>>>LONGER to reach zero! If you have infinite damping, the mass stays
>>>>where it is - it does NOT 'high tail' it back to the zero line!
>Wolfgang Bauer, Professor and Chairperson
>Department of Physics and Astronomy
>Michigan State University
>4208 Biomedical Physical Sciences
>East Lansing, MI 48824-2320
>Tel.: (517) 353 8662
>Fax.: (517) 353 4500
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