Abstract
The calibration of a multicomponent force transducers (MFTs) represents a challenge in the meganewton range. In fact, the generation of transversal forces and moments is complex since a force standard machine (FSM) is only able to apply an uniaxial force. Furthermore since MFTs are composed of multi-transducers, each one dedicated to a particular component, correlations between force and moment components are possible. Therefore, a calibration system that could simultaneously generate all force/moment components and could be suitable in every FSM is needed. For this purpose, a couple of tilted plates was designed. Calibration measurements were performed on a 2 MN MFT at INRiM, LNE and PTB. Exploitation matrixes and performance indicators showed good results, unless small but not negligible correlations between MFT outputs. In particular some spurious values due to the uncertainty in the vertical force application point influenced the moment components.
Highlights
Calibration of multicomponent force transducers (MFTs) strictly depends on the range of the applied transversal forces
Measurements performed at INRiM, Physikalisch-Technische Bundesanstalt (PTB) and LNE are compared in order to evaluate the correlation between the MFT outputs
Calibration procedure The calibration procedure of the MFT can be summarized as follows: the MFT was aligned and centred with the single vertical force load; the MFT was positioned with an eccentricity of 3 mm along the y-axis; the MFT was displaced with a further eccentricity of 3 mm still along the y-axis; the MFT was displaced with a further eccentricity of 3 mm along the x-axis; the eccentricity of the MFT along the y-axis was reduced of 3 mm
Summary
From 0 N to an upper limit of 1 kN, it is possible to use two graduate rotating tables combined with a mass able to generate an accurate vertical force [1]. To increase this range to the meganewton range, side loads are usually generated with systems based on pulleys, while moments are obtained with torque measurement structures [2]. A MFT calibration system should combine force and moment components in order to verify the exact correlation between them and, at the same time, should fit every type of FSM. Measurements performed at INRiM, PTB and LNE are compared in order to evaluate the correlation between the MFT outputs
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