A procedure for dynamic force calibration using sinusoidal excitations of force transducers is described. The method is based on a sinusoidal excitation of force transducers equipped with an additional top mass excited with an electrodynamic shaker system. The acting dynamic force can in this way be determined according to Newton's law as mass times acceleration, whereby the acceleration is measured on the surface of the top mass with the aid of laser interferometers. The dynamic sensitivity, which is the ratio of the electrical output signal of the force transducer and the acting dynamic force, is the main point of interest of such a dynamic calibration. In addition to the sensitivity, the parameter stiffness and damping of the transducer can also be determined. The first part of the paper outlines a mathematical model to describe the dynamic behaviour of a transducer. This is followed by a presentation of the traceability of the measured quantities involved and their uncertainties. The paper finishes with an example calibration of a 25 kN strain gauge force transducer.
This paper describes the dynamic characteristics of a
binocular six-component force-moment sensor with force components
Fx, Fy and Fz, each having 200 N capacity, and
moment components Mx, My and Mz, each having
20 N m capacity. We have evaluated the dynamic characteristics
of the force-moment sensor by using a shaker system and a
multichannel dynamic analyser system. It reveals that the
sensitivity decreases as the frequency increases and that the
sensor shows almost 90° symmetry due to its geometry.
This paper describes the dynamic characteristics of a
three-component force-moment sensor with the transverse forces
Fx and Fy each having 200 N capacity and a
twisting moment Mz of 10 N m capacity. We have evaluated
the dynamic characteristics of the force-moment sensor by using
a shaker system and a multi-channel dynamic analyser system. It
reveals that the sensitivity decreases as the frequency
increases and that the sensor has a 90° symmetry due
to its geometry.
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