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Cantilever Mounted Bi-Axial Force Transducer With Near Parallel Translation

IP.com Disclosure Number: IPCOM000120429D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 3 page(s) / 80K

Publishing Venue

IBM

Related People

Brodsky, WL: AUTHOR

Abstract

Disclosed is a bi-axial force transducer which is cantilever mounted and minimizes rotation of the load application end. The transducer consists of two frame structures connected in series. The rotational alignment of the frames determines the reference coordinate system for the force measurements.

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Cantilever Mounted Bi-Axial Force Transducer With Near Parallel Translation

      Disclosed is a bi-axial force transducer which is
cantilever mounted and minimizes rotation of the load application
end. The transducer consists of two frame structures connected in
series.  The rotational alignment of the frames determines the
reference coordinate system for the force measurements.

      Fig. 1 shows a preferred embodiment of a transducer used to
measure two orthogonal forces, Fy and Fz.

      The transducer is divided into two sections: section one
measures the force Fy and section two measures force Fz. In each
section there are two beams (1A, 1B and 2A, 2B; respectively) which
are instrumented with 2 strain gages each (6, 7, 8 and 9).

      The flexural stiffness of beams 1A, 1B and 2A, 2B is much less
than members 3, 4 and 5 (i.e., 8000 times more flexible).  Hence
members 3, 4 and 5 are rigid bodies compared to the flexural beams
inducing the beams 1 and 2 to act as guided cantilever beams.  This
provides for parallel translation of end 5.

      Loads imposed on the structure at the end (5) are divided non-
linearly between the beams A and B, respectively.  The non-linear
force distribution occurs so to satisfy the structure's equations of
equilibrium, which are:
   1)   Sum of shear forces on beam A and B must equal
        applied shear.
   2)   Axial forces on beams A and B are equal and
        opposite.
   3)   S...