A frequency method for dynamic uncertainty evaluation of measurement during modes of dynamic operation

Department of Metrology and industrial automation, Vinnytsia National Technical University, 95 Khmelnitskoye Shose, Vinnytsia, 21021 Vinnytsia, Ukraine

^⋆ Correspondence: o.vasilevskyi@gmail.com

Received: 2 March 2015
Accepted: 30 May 2015

Abstract

Proposed the frequency of method to assessing the dynamic uncertainty of measurement devices which allows to investigate the accuracy of changes in the dynamic operation conditions in the frequency domain, estimate the amplitude dynamic uncertainty based on frequency characteristic and the spectral function of the input signal. This approach was tested at the evaluation dynamic uncertainty of devices measuring dynamic torque of induction electromotors, whereby it was confirmed correctness theoretical statements. On the basis of the calculations that the relative dynamic uncertainty of device measuring is 5.38% and the measuring range from 0.1 to 8 N m, and in the range measuring of dynamic torque of electromotors from 0.1 to 30 N m its value is 5.33%. The proposed approach to the evaluation of the dynamic uncertainty can be used for measuring instruments that have dynamic elements of any type. First proposed a theoretical approach to the assessment the characteristics dynamic of the uncertainty of measuring instruments, working in dynamic modes of operation that meets international standards for presentation of the characteristics of quality and accuracy of electrical products. Theoretical results are tested when measuring dynamic torque of electromotors, which confirmed the correctness and effectiveness of the proposed frequency method for estimating dynamic uncertainty.