PSN-L Email List Message
Subject: Verticals
From: "Ted Channel" tchannel@............
Date: Sun, 27 Dec 2009 06:59:50 -0700
Hi Folks, I have downloaded Bob McClure's great program SpringCalc.exe. =
I have put in some numbers and see it calculates very long periods =
under certain conditions, periods of >20.
My question is can long periods like these really be achieved? I have =
build several models and some working sensors using this approach, but I =
have never gotten more than about 3x the springs natural frequency. A =
spring of .5 second, just hanging vertically, resulted in a sensor of =
1.5 seconds. I guess the AS1 is another example. The design of the =
AS1 is widely used and am I correct that it is operating at about 1.5 =
seconds? In theory, is this shape, capable >10 seconds?
I hope to use Bob's program to construct another vertical, but I am =
confused, about my results. I know there are methods for extending =
the period, but here I am just asking about the physical results of =
using a spring-supported pendulum constrained to move in a vertical =
plane. Perhaps these calculated long periods would only be possible =
under the best of conditions, where all factors were perfect. I seem =
to get a period of around x3 that of the spring hanging vertical with =
a mass. I have tried many different springs and the result were very =
similar in achieving only x3.
Hi Folks, I have downloaded Bob =
McClure's=20
great program SpringCalc.exe. I have put in some =
numbers and=20
see it calculates very long periods under certain conditions, periods of =
>20.
My question is can long periods like =
these really=20
be achieved? I have build several models and some =
working=20
sensors using this approach, but I have never gotten more than about 3x =
the=20
springs natural frequency. A spring of .5 second, just =
hanging=20
vertically, resulted in a sensor of 1.5 seconds. I guess the =
AS1 is=20
another example. The design of the AS1 is widely used and am =
I=20
correct that it is operating at about 1.5 seconds? In =
theory, is=20
this shape, capable >10 seconds?
I hope to use Bob's program to =
construct another=20
vertical, but I am confused, about my results. I know =
there=20
are methods for extending the period, but here I am just asking about =
the=20
physical results of using a =
spring-supported=20
pendulum constrained to move in a vertical plane. =20
Perhaps these calculated long periods would only be =
possible under=20
the best of conditions, where all factors were =
perfect. I seem=20
to get a period of around x3 that of the spring hanging =
vertical=20
with a mass. I have tried many different springs and =
the=20
result were very similar in achieving only x3.
Thanks, Ted
[ Top ]
[ Back ]
[ Home Page ]