Accelerometer errors in the measurement of dynamic signals. (January 2015) - Tomczyk, Krzysztof
Highlights: The review of literature concerning errors of the dynamic systems is presented. Reference was made to the Guide to the Expression of Uncertainty in Measurement. The method for determining the accurate models of accelerometers is discussed. Two constraints imposed on input signal of the accelerometer were analyzed. The procedure of the error determination is presented as an example. Abstract: The paper presents the way of determining the time dependent characteristics of maximum error generated by an accelerometer in case it measures dynamically changing signals of vibrations. For that purpose, a domain has been specified, which may contain the class of signals maximizing the error criterion assumed. Indispensable constraints have been imposed on signals, which result from the dynamic properties of the accelerometer examined. These constraints concern amplitude and rate of change. Constraint values have been determined using a mathematical model of an accelerometer obtained from concurrent measurements of its amplitude and phase characteristics. The error has been calculated in relation to a standard, having the form of an ideal low-pass filter. The characteristics of the error as a function of measurement time have been provided. The numerical solutions presented in the article refer to a popular accelerometer of the PCB type, and error in the form of integral square-error.