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# Re: why different force??

- To: femm@yahoogroups.com
- Subject: Re: why different force??
- From: "David Meeker" <dmeeker@ieee.org>
- Date: Fri, 05 Sep 2003 16:18:45 -0000
- In-reply-to: <bj8uq1+rkq9@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@yahoogroups.com, "ahmad_m_eid" <ahmad_m_eid@y...> wrote:
    > Dear all
    > I use femm in my work in linear generator
    > when I trace a path around the stator to find the force by "force
    > from stress tensor" I get a value for the force on stator
    >
    > when I use the block integration and select all stator blocks anf find
    > force from " force via weighted stress tensor" I get another value and
    > away from the first value comes from line integral.
    >
    > what is the best way to find the force on stator?
    >
    > how can one explain these different results?

    The accuracy of the stress tensor line integral can be quite sensitive
    to the choice of contour and the mesh density. I did the "force via
    weighted stress tensor" block integral in an attempt to make things
    less sensitive. You could view what the weighted stress tensor does
    as automatically picking a "good" set of contours to take the integral
    along.

    That being said, it is also often a good idea to re-run an analysis
    with an increased mesh density to see how well the force result has
    converged.

    Dave.
    --
    http://femm.berlios.de/dmeeker

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