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  • Methodology and device to measure impact force replies summary

    Dear Netters,
    According to my request about methodology and device to measure
    impact force three weeks ago, I've got some response. I very appriciate
    for your time and your suggestion. I'm now posting the results of that
    request to the list.

    Thanks to Juan Carlos Garbalosa, Center for Locomotion Studies ,
    Pennsylvania State University, also thanks to Erik Eustache. Special
    thanks to Professor Jim Sawhill, Professor Dennis K. Lieu at M.E., UC
    Berkeley, Madeleine Moffitt at U.C. Berkeley, and special thanks to
    Andrew Dainis.
    Thanks again, Suwat.
    Here are the results for my request.

    Date: Tue, 31 Jan 1995 14:43:55 -0500 (EST)
    From: SAWHILLJ@queen.lsc.vsc.edu
    To: sidthils@UCS.ORST.EDU
    Subject: Re: Need Help:Methodology and device to measure impact force

    Read a thesis by Bruce Abbott from Washington State University done
    approximately 1986. I was his major advisor.
    We built a device incorporating a Kistler 3 axis force transducer into
    an adjustable height stand and with a stiking pad that moved, once struck,
    until it reached the end of its excursion on bearing shafts. A/D records
    of the strikes also included the collision of the pad at the end of its
    excursion giving us a dynamic view of the picture.
    Last I knew Bruce was living in Spokane, WA area (actually Cheney) and
    was looking to work at Eastern Washington University. You might find
    him in that area and he would be more than willing to help out. He
    personally owns the instrumentation, but you could easily replicate, or
    improve it, in Corvallis.
    Does Riley Chan still work in Chemical Engineering?

    Good luck, Jim
    ================================================== ================
    Date: Wed, 1 Feb 95 09:45:35 -0500
    From: dainis%bmlvax.dnet@dxi.nih.gov
    To: dxi: : , "sidthils@ucs.orst.edu"@ucs.orst.edu ; ;
    Subject: Corrected message from Andy Dainis

    Hello Suwat,

    I have successfuly used a ballistic pendulum to measure punching and kicking
    forces on more than one occassion. It is a device that is very simple and
    inexpensive to build, and provides accurate results, as well as being
    easy to
    calibrate. In its simplest form, suspend a padded weight from the ceiling
    with
    a rigid bar, so that it pivots at the upper suspension point. If you
    strike it,
    the pendulum will swing and you can measure its maximum amplitude, with a
    goniometer if you want to get a little fancy. Then, mg(dh) = (1/2)*m*v*v
    which
    gives you the velocity. Impulse = m*(change in velocity) = m*v = force
    integrated over the impact time. If you measure the time of force application
    with a simple contact switch, then you can easily calculate the average force
    applied. Good luck.
    ################################################## ##################
    Andrew Dainis Ph.D. |
    ADTECH |
    2002 Ruatan St. | Phone: 301/435-0785
    Adelphi, MD 20783 | Fax/Ans: 301/434-5569
    U.S.A. | Email: dainis%bmlvax.dnet@dxi.nih.gov
    ################################################## ##################
    ================================================== ================
    Date: Wed, 1 Feb 1995 13:33:41 -0800
    From: Dennis Lieu
    To: sidthils@ucs.orst.edu
    Subject: roundhouse kicks


    If you send me your address, I will send you a paper on some work we have
    done. There will also be a general interest article in the next issue of
    the U.S. Taekwondo Journal, if you can get a copy of that. Maybe you can
    visit us some time...

    Dennis K. Lieu
    Associate Professor
    Mechanical Engineering
    UC Berkeley

    ++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++
    Date: Thu, 2 Feb 1995 08:39:58 -0800
    From: Dennis Lieu
    To: sidthils@ucs.orst.edu
    Subject: Re: roundhouse kicks

    I put some of my papers in the mail for you. If you do not receive them
    in a week, please let me know. Feep in mind that measuring impact *force*
    can be very misleading. You need to know the force duration, and impact
    velocity as well. Overall *energy* content must be considered.

    A Prof. Willy Peiter, in the PE Department of Oregon State or University of
    Oregon, as done a lot of work is the study of taekwondo injury. Have you
    contacted him?

    D.K. Lieu

    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!++++++++++++++++++++++++++++++++++++++\
    Date: Thu, 2 Feb 95 22:03 EST
    From: Juan Carlos Garbalosa
    To: sidthils@UCS.ORST.EDU
    Subject: Re: Need Help:Methodology and device to measure impact force

    Suwat
    If you are only interested in the normal forces of the kick (foot-object)
    you m
    ay want to look at the Pedar unit manufactured by Novell. If you need
    further
    information let me know. Good luck!
    Juan Carlos Garbalosa
    Room 10 IM Building
    Center for Locomotion Studies
    Pennsylvania State University
    e-mail: jcg2@psuvm.psu.edu
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~
    ************************************************** ******************************************
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