Measurement error minimization of bending wave power flow on a structural beam by using the structural intensity techniques

This paper shows that measurements of bending power flow by using 2, 3 and 4 position linear acclerometer array (2, 3 and 4 Structural Intensity: 2, 3 and 4 S.I.) methods can give accurate determination under general field conditions in structural beam. To minimize the errors associated with using the 2, 3 and 4 S.I. methods, the measurement locations were selected by the result of modal analysis and the average data by the interchange of accelerometer array was utilized. In the 3 and 4 S.I. methods, measured wavenumber instead of theoretical wavenumber was used. In comparison with the accuracy between structural intensity methods and input power measurement a correcting factor should be considered in the measurement values of input power measurements.