Far-field power transmissions in orthotropic plates: A new approach

Article type: Research Article

Authors: Mandal, Nirmal K.

Affiliations: Centre for Railway Engineering, Central Queensland University, Bruce Highway, North Rockhampton, Queensland 4702, Australia. E-mail: n.mandal@cqu.edu.au

Abstract: The structural intensity (SI) technique is an essential tool for locating and ranking vibration sources and sinks on structures. It can quantify vibration fields by plotting a vector map of energy transmission on the structures. In this paper, a different strategy, changing coordinate systems of plate equations, is used to develop an intensity equation from shear force components in both x and y directions. The formulation is carried out in the frequency domain considering flexural waves. Orthotropic plate theory, far-field conditions, Fourier transform, and finite difference approximation are considered. The same intensity definition is obtained using this different strategy. A dual-channel FFT analyser is essential for data acquisition to get an intensity vector in a particular direction for far-field conditions.

Journal: Shock and Vibration, vol. 15, no. 1, pp. 71-78, 2008