Estimation of Normalized Eigenmodes and Natural Frequencies by Using the Effect of Accelerometers Mass

Several studies have been attempted to grasp the modal characteristics in machine operation. Derivation of the scaling factor for normalized eigenmodes is one of the important issues in operational modal analysis. In this study, we propose a procedure with the mass of piezoelectric acceleration transducers. Then the vibration testing for the mass change method is performed without using additional masses. We obtain the modal characteristics from the acquired acceleration responses by the transducers that is less than all measurement points. That is, the measurement is performed multiple times by changing the measurement locations. A modified procedure is proposed to calculate the scaling factor for normalized eigenmodes and proper natural frequencies by removing the influence of the mass of the added piezoelectric accelerometer. The validity of the proposed method is verified by numerical calculations and experiments of a rectangular plate.

Vibration Engineering for a Sustainable Future Vol.2