Re: [ATM] Active damping

["RodShea" <RodShea@comcast.net>]

The basic idea K2 had is a piezoelectric crystal that powers a solenoid that 
pushes to straighten out the ski when it flexes due to vibration.  The 
strange thing about those skis is that the faster you go, the damper they 
get.  Some of that probably has to do with the frequencies they are trying 
to damp...

Rod Shea

----- Original Message ----- 
From: "Don Clement" <clement.focuser@verizon.net>
To: <atm@atmlist.net>
Sent: Saturday, August 13, 2005 7:15 PM
Subject: Re: [ATM] Active damping


Ken:

The guys with the  active dampening  on commercial ski/ snowboards must look 
pretty silly or just plain stupid with those big heavy wasted energy power 
supplies. Perhaps they just put the power supplies in a back pack? Guess the 
K2 designers never heard of KISS or "real" designs.

Don Clement
  ----- Original Message ----- 
  From: Ken Hunter
  To: Don Clement ; atm@atmlist.net
  Sent: Saturday, August 13, 2005 6:56 PM
  Subject: Re: [ATM] Active damping


  OK... Lets analyze this again for at least the tenth time...

  We build a lightweight telescope to reduce weight and the size of the load 
we have to carry!

  To compensate for the problems caused by the lightening of the members, we 
insert adaptive detectors, filters, computers and actuators... not to 
mention the power supplies, wasted energy etc...

  Why not just build a REAL telescope instead? Remember the KISS principle?

  Ken Hunter



  Don Clement <clement.focuser@verizon.net> wrote:




    > You could also run a loose piece of rope from one end to the other 
inside
    each truss tube > to absorb the vibrational energy. Just like HAM RADIO
    operators have been doing in
    > their big aluminum tubed beam antennas for generations now.

    One of the major advantages of active dampening over passive dampening 
(like
    the rope) is that is doesn't take several or even one complete cycle to
    correct unwanted vibration. If the system is modeled correctly, or with
    adaptive filters, only a portion of a cycle is needed for corrective 
action
    to be applied. With active dampening, the system is damped almost before
    vibration can occur.

    Don Clement
    Running Springs, California

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