Abstract
This paper discusses an estimation of unmeasured auto frequency response function (FRF) based on maximum likelihood method. Moreover, the Reliability Factor for evaluating an effect of random noise in unmeasured auto FRF is introduced. The authors have proposed the method by using additional masses that are attached to an unmeasured point of a target structure. Maximum likelihood method is used to reduce the effect of the random noise that is included in the measured cross FRFs since the noise influence the accuracy of the estimated auto FRF. The validity of the proposed method is verified by comparing the FRFs of a beam structure obtained by maximum likelihood method and impact testing using an impulse hammer.
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