Experimental and Numerical Investigation of Vibration Power Flow of Thin Plate Using Cross Power Spectral Density Based Technique

Abstract

The application of thin plates as elements of machines and vehicles component working under various operational condition causes degradation and occurrence of damage. Hence, it is extremely important to identify the dynamic characteristic and the vibration power flow of the thin structure that indicates magnitude and direction of vibration power distribution, and transmission path. This study aims to examine the potential changes in the dynamic characteristics and the vibration power flow of the thin plate at its’ first four natural frequencies. The numerical modal analysis and the experimental modal analysis of the thin plate was conducted in the first step. The vibration power flow was measured utilizing the cross power spectral density-based technique which was validated with the results from calculation. The power flow maps of the plate at the first four natural frequencies are presented. The visualization utilizing vector plot and streamline shows the vibration power flow direction, magnitude, and transmission paths in the plate. The results show that the higher frequency, the path of the vibration power flow become more complicated. This research proposed a measuring method, through simple calculation and visualization of vibration power flow of the plate that may give a contribution to the design phase in manufacturing sectors, the manufacturer, and structural health monitoring.