Alt-BEAM Archive
Message #13472
To: beam@sgiblab.sgi.com
From: "sebastiaan van Vliet" beam@sgiblab.sgi.com
Date: Sun, 16 Apr 2000 08:05:50 PDT
Subject: Re: Solar powered pendulumn project
Basic physics tells that a pendulum allways has the same swinging period no
matter how much it swings, so creating the bot and measuring the period and
ajust yout pulsing signal should work. This enables itself to start from zip
speed!
>From: Jeffrey D Spears
>Reply-To: beam@sgiblab.sgi.com
>To: beam@sgiblab.sgi.com
>Subject: Solar powered pendulumn project
>Date: Fri, 14 Apr 2000 21:16:48 -0400 (EDT)
>
>Greetings;
>
>A few weeks ago I stumbled onto BEAM and have become interested in
>the whole thing. Seeing how I am taking the second-term circuit
>analysis course (FOCs, SOCs, diodes, mosfets--all both time and freq
>domain)--Beam technology provides excellent test-bed to hammer it
>all home. Fooling around at home, siren RC circuits are boring.
>Beam circuits/applications look cool!
>
>So I have in mind to build a Beam style solar powered pendulumn to
>hang in my window. What I imagine is some sort of simple linear
>motor--a magnet and big coil--delivering a little kick at the right
>time. Once the appratus is built I can experiment with different
>triggering methods, be it detecting the position of the pendulumn or
>a resonate circuit tuned to the period of the pendulumn.
>
>The motor itself may consist of a magnet attached to the pendulumn
>via an arc of stiff metal rod. This arrangement would pass through
>the coil, mounted to the base, as the pendulumn swings.
>
>Intuition tells me that the push wants to be applied during the
>time when the pendulum starts to move down from either side.
>Playing with my pencil and a paper, I cannot see any easy way to
>configure it this way. Therefore my idea is to have the coil in
>the center of pendulumn travel. It will be pulsed with one
>polarity when the pendulumn is traveling one way, and the other
>polarity when the pendulumn is moving the other way. The pendulumn
>itself will be traveling by this point at varying velocites which
>will probably need compensating for.
>
>If all this works out, then a seperate circuit could be added to
>maintain operation overnight.
>
>The PM-1 from Mike Tilden--a super-cap and timing network
>contraption--looks like a fun little circuit and may be suited for
>this application.
>
>Any thoughts from the group? What would N. Tesla do?
>What say you?
>
>ok..jef
>
>
>Jeffrey D. Spears
>University of Michigan
>College of Engineering
>
>``Double-E, can't spell gEEk without it!''
> -Captain Gerald M. Bloomfield II, USMC
> (my brother)
>
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