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> On Sep 11, 2021, at 10:08 AM, Adrian Godwin <artgodwin at gmail.com> wrote:
> 
> Doesn't that depend on the configuration of the fields ?
> For instance, a pair of facing like poles will repel and, as you say, make
> a good spring.
> But a magnet falling down an aluminium tube will go slowly, because of the
> generated eddy currents and their subsequent fading due to the lossy
> aluminium.
> 
> 
>> On Sat, Sep 11, 2021 at 2:02 PM Poul-Henning Kamp <phk at phk.freebsd.dk>
>> wrote:
>> 
>> --------
>> Gilles Clement writes:
>> 
>>> Magnetic levitation, dampening external vibrations ?
>> 
>> By theselves magnetic fields are just really good springs.
>> 
>> To get any kind of dampening you either need to add a
>> dash-pot (=shock-absorber) as a dissipative device or
>> you need to modulate the magnitic field to emulate
>> the same result.
>> 
>> I'm told the latter is much harder than it sounds.
>> 
>> --
>> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
>> phk at FreeBSD.ORG         | TCP/IP since RFC 956
>> FreeBSD committer       | BSD since 4.3-tahoe
>> Never attribute to malice what can adequately be explained by incompetence.
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