Effect of external excitation on dynamic characteristics of vibration isolating table

Abstract

Scientific publications available on sandwich panels in evaluating fundamental frequency with a non-dimensional parameter have been discussed in this article. Effectiveness of optical table with pneumatic vibration insulation supports have been analysed in low (1-50) Hz and higher (500-1200) Hz frequency range. Experiments of vibration transmissibility performed using vibration excitation apparatus and other special test equipment. The dynamics characteristics and application ranges of a table as low frequency vibration damper have been defined. Theoretical and experimental modal analysis of the main part of the system – top surface of table – has been performed. This analysis enabled to determine four resonant eigen-frequencies at higher frequency range. Research results show the reliability of vibration table usage and the dangerous zones of its exploitation.