This paper describes the design and fabrication of a six-component
force/moment sensor testing machine and the evaluation of its uncertainty.
This testing machine, which generates forces Fx (x-direction force),
Fy and Fz from 50 to 500 N each and moments Mx (x-direction
moment), My and Mz from 5 to 50 N m each, simultaneously or separately,
consists of a body, a fixture, a force generating system, a moment generating
system, weights and a control system. Forces and moments are automatically
generated by the control system composed of a computer, three step motors and
so on. Also, the relative expanded uncertainty of the testing machine is
evaluated. The results show that the relative uncertainties for force
components ±Fx and ±Fy and moment components ±Mx and
±My are less than 8.6×10-4 and those for force components
+ Fz and -Fz and moment components ±Mz are less than
1.7×10-3, 1.2×10-5 and 1.7×10-3 respectively.
This paper describes the development of a six-component force/moment
sensor with plate beams which may be used in industry for measuring forces
Fx, Fy and Fz and moments Mx, My and Mz simultaneously and
the evaluation of its relative expanded uncertainty. In order to develop the
six-component force/moment sensor with small capacity (Fx of the sensor
(x-direction force sensor), Fy and Fz are each 100 N, Mx of the
sensor (x-direction moment sensor) and My are 1 N m, Mz is 2 N m), the
structure of such a sensing element for the six-component force/moment sensor
is newly modelled, designed and manufactured. Also, methods for calibration
and evaluation of the relative expanded uncertainty are newly proposed. The
six-component force/moment sensor developed here is calibrated with the
proposed calibration method and the relative expanded uncertainty is evaluated
using the proposed uncertainty evaluation method and the calibration results.
This reveals that the relative expanded uncertainty of the six-component
force/moment sensor is less than 2.78%. Thus, it is thought that this
six-component force/moment sensor can be usefully used in
industry and that the methods for calibration and evaluation of the uncertainty
can also be used for calibration and evaluation of the uncertainty of the
multi-component force/moment sensor.
ObjectiveTo examine the intra-rater, inter-rater, and inter-instrumental reliability of the digitalized pinch muscle strength dynamometer.MethodThirty normal subjects were examined for pinch strength, using both the Preston pinch gauge and the digitalized pinch dynamometer. The participants performed all pinch strength tests in the seated position as recommended by the American Society of Hand Therapists (ASHT). Three successive measurements were taken for each hand. The mean of the three trials was used for data analysis. The pinch strength tests performed used a repeated measure design and measurements were taken by each rater.ResultsThe relationship between the Preston pinch gauge and the digitalized pinch dynamometer in pinch strength was reliable (the ICC were 0.821 and 0.785 in rater 1 and rater 2 respectively). The relationship between the first session and second session in pinch strength using the digitalized pinch dynamometer was reliable (the ICC were 0.872 and 0.886 in rater A and rater B respectively). The relationship between rater A and rater B in pinch strength using the digitalized pinch dynamometer was reliable (the ICC was 0.754).ConclusionThe pinch strength measurement using the digitalized pinch dynamometer is reliable within the rater and between raters. Thus, the Preston pinch gauge and the digitalized dynamometer measure grip strength equivalently, and can be used interchangeably.
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