The Control of Local Vibration Modes of a Box Structure using Honeycomb Panel

摘要

The findings suggested that the vibrations of local modes are of two types: (1) Centre mode– the centre of top panel can move but the edge is fixed. (2) Edge (web) mode – the centre oftop panel is fixed but the edge (supported by web) can move.The experimental results on vibration characteristics of the cement viaduct model demonstratedthat the predominant centre mode is at 274 Hz and the web mode are at 226 Hz and 260 Hz.The web excitation mode shape data indicate that the boundary condition may not be a simplysupport condition as assumed but is more likely to be a freely support condition. The web facescan have large vertical motion when force is applied at the edge position. In addition, themobility level of web excitation below 520 Hz is higher than that of centre excitation.