Dynamic stability of layered beams with bolted joints under parametric excitation

Abstract

Time dependent excitation appearing as a variable co- efficient in the governing equation of motion is called parametric excitation. Dynamic stability of elastic systems deal with the study of vibrations, induced by pulsating loads that are parametric with respect to certain forms of deformations. An important aspect in the analysis of parametric dynamic system is the establishment of the regions in the parametric space in which the system becomes unstable; these regions are known as regions of dynamic instability. The boundary separating the stable zones from unstable zones are called stability boundaries and the plot of these boundaries on the parametric space is called the stability diagram. Beams are the simplest structural members in any machine, mechanism or large structure. Layered structures are gaining importance in the present day because of their good damping capacity characteristics. The objective of the proposed research work are to carry out experimental investigations to study the dynamic stability of layered structured beams with bolted joints with different configurations of constraining layers. It is to investigate the following aspects of the dynamic stability of beams. Experimental has been carried out to validate the theoretical findings. The results are in complete match with the theoretical one.