PSN-L Email List Message

Subject: RE: Vertical Seismometer with Honey Support
From: "Gary Lindgren" gel@.................
Date: Tue, 18 Nov 2008 16:30:32 -0800


Hello Bob,

Thank you for your spring calculator. I would like to keep the mass at =
about
..5 Kg. so that I can eventually use a feedback system. I can see that =
I=92m
going to have a hard time getting a spring for this small mass size. =
From
what I can tell I need a spring with a constant of 3 Kg./m. This turns =
out
to be 0.17 lbs/in or a very small spring. The surprising thing is that I
don=92t need a long spring, just a small spring constant. BTW I tried =
the
parameters of the concept model. It turns out that the spring constant =
was
maybe 270 kg./m. I got 0.18 seconds for the period. That seems about
correct.

Thank you for the tool.

Gary

=20

From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of Robert McClure
Sent: Sunday, November 16, 2008 7:53 PM
To: psn-l@..............
Subject: Re: Vertical Seismometer with Honey Support

=20

Hi Gary,

 I have a design calculator for spring-supported vertical seismometers. =
See

  http://bobmcclure90.googlepages.com/springcalc

  You wrote: As configured the resonant period is very short, maybe =BD
second. Is there an equation that defines a vertical seismometer =
resonant
period. I assume the spring constant is part of the calculation.

Bob












Hello Bob,

Thank you for your spring calculator. I would like to = keep the mass at about .5 Kg. so that I can eventually use a feedback system. I = can see that I’m going to have a hard time getting a spring for this small = mass size. From what I can tell I need a spring with a constant of 3 Kg./m. = This turns out to be 0.17 lbs/in or a very small spring. The surprising thing = is that I don’t need a long spring, just a small spring constant. BTW = I tried the parameters of the concept model. It turns out that the spring = constant was maybe 270 kg./m. I got 0.18 seconds for the period. That seems about = correct.

Thank you for the tool.

Gary

 

From:= psn-l-request@.............. [mailto:psn-l-request@............... On = Behalf Of Robert McClure
Sent: Sunday, November 16, 2008 7:53 PM
To: psn-l@..............
Subject: Re: Vertical Seismometer with Honey = Support

 

Hi Gary,

 I have a design calculator for spring-supported vertical = seismometers. See

  http://bobmcclure= 90.googlepages.com/springcalc

  You wrote: As configured the resonant period is very short, maybe = =BD second. Is there an equation that defines a vertical seismometer = resonant period. I assume the spring constant is part of the calculation.

Bob


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