DefinePK

Abstract

Beam structures are common parts in many structural applications. Due to its slenderness, beams are susceptible to lateral vibration motion. Continuous structure such as beam has finite number of vibration modes that make it difficult to control. In this paper, the concept of tuned vibration absorbers applied to a beam structure was analyzed by finite element analysis code, ANSYS APDL. The tuned vibration absorbers were attached to the fixed-fixed end beam with four different conditions according to its location of attachment. First, modal analysis has been carried out to determine the natural frequencies and natural mode shapes of the studied beam structure. Then, the effect of tuned absorbers locations on beam vibration characteristics have been studied by harmonic analysis. The vibration characteristics of the beam were discussed with respect to the corresponding tuned absorbers and beam natural modes. It was found that the absorber location affect the beam vibration amplitude greatly. High percentage of vibration amplitude reduction is achieved when the beam amplitude node is avoided. Beam vibration amplitudes were reduced by 99.9% and 99.8% at its 1st and 2nd mode respectively when the absorbers were placed near the fixed end.