The Effect of Analysis Bandwidth on the Accuracy of Measurements and Predictions of Single Degree of Freedom System Behaviour.

摘要

The accuracy of measurements or predictions of the frequency response of a single degree of freedom system depends on the frequency resolution of the analysis technique. If the ratio of analysis bandwidth to the 3dB bandwidth of the resonance is too great, negative bias errors occur at resonance in estimates of both power spectra levels and transfer function amplitudes. These errors, which have been calculated numerically, are presented and compared with appropriate experimental data. (Author)