Calibration of Additional Channels of Multi-Channel Dynamometers Using a Prism as a Method for Compensating the Force Measurement Error Performed by the Method of Combined Measurements

In the Russian Federation, the reproduction and transfer of the measurement unit of force in the range from 10 N to 1 MN is carried out using the State Primary Standard of the measurement unit of force GET 32–2011, in accordance with the State Verification Schedule. However, modern industry, at a new stage of its development, has an urgent need to ensure metrological traceability for forces exceeding 1 MN.
The State Verification Schedule for transferring the unit of force in the range under discussion implies the use of the method of combined measurements. This method meets the current requirements of production processes, but it has a number of significant limitations that prevent increasing the accuracy of measuring instruments in the range above 1 MN to a level comparable to the method of direct measurements.

The purpose of the research presented is to consider and study a number of factors influencing the measurement result of force measuring instruments that implement the method of combined measurements.

The starting point for achieving this goal was to identify the factors that reduce the accuracy of the combined measurement method of force when using groups of parallel-loaded dynamometers. To identify and evaluate these factors, the method of analyzing regulatory documents and literature sources was applied. The experimental part of the work was carried out using a group of dynamometers from GET 32–2011. The method of combined measurements was implemented using parallel-loaded dynamometers. Calibration of the additional channels of multi-channel dynamometers was carried out by conducting several series of loadings of the dynamometer on the force standard using a prism.
An analysis of the theoretical framework showed that the central problem is the systematic error arising from the deviation of the applied force vectors from the sensitivity axes of the dynamometers. To solve this problem, a theoretical model was developed to quantitatively assess this influence, along with a new method for calibrating the additional channels of multi-channel dynamometers using a prism, which makes it possible to compensate for this error.

The results of the work presented in the article can be considered as a promising direction for further research into the influence of the factors described in this article on the results of force measurements, suggesting the potential to improve the accuracy of force measurements in the range from 1 to 9 MN.

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