I do not know your code at all; and, perhaps, I'm misreading your
question; but I believe that radians are dimensionless, therefore, you do
not multiply radians by anything when you change space dimensions.
Regards,
H. Daryl Richardson
----- Original Message -----
From: "Christopher Wright" <chrisw@skypoint.com>
To: "SEAOC Newsletter" <seaint@seaint.org>
Sent: Monday, August 04, 2008 12:45 PM
Subject: Nuclear reactors and earthquakes (TID-7024) example
> Has anyone ever gone through the example seismic calculation (Steam
> Generator) in Appendix E of TID-7024? I reworked the problem using Excel
> for the arithmetic and I'm finding some fairly significant errors, some
> of which are likely due to the slide rule precision used when the problem
> was first laid out and others which look like some other numbers possibly
> mixed in from another problem or another version of the same problem. For
> example one of the two calculated natural frequencies seems to change
> from 80.6 rad/sec to 79.8 rad/sec and the other goes from 897 rad/sec to
> 932 rad/sec. at the end. Since the problem was carried through in length
> units of feet, the calculated displacement of 0.00047 ft is converted to
> 0.0056 inches, like you'd expect, but a rotation of 0.000212 radians also
> gets multiplied by 12 to get 0.0025 radians, which is a bit squirrelly.
> The 'converted' angular displacement gets carried into a calculation of
> the maximum overall displacement of 0.144 inches which isn't right.
>
> Is anyone aware that these errors exist? This isn't a particularly urgent
> situation, since I'm using it as an exercise in a tutorial I'm putting
> together, but I'd be grateful if anyone has any background on possible
> errors.
>
> Christopher Wright P.E. |"They couldn't hit an elephant at
> chrisw@skypoint.com | this distance" (last words of Gen.
> .......................................| John Sedgwick, Spotsylvania
> 1864)
> http://www.skypoint.com/~chrisw/
>
>
>
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