Vibration Attenuation of Plate Using Multiple Vibration Absorbers

Abstract

Abstract. Vibrations are undesired phenomenon and it can cause harm, distress and unsettling influence to the systems or structures, for example, aircraft, automobile, machinery and building. One of the approach to limit this vibration by introducing passive vibration absorber attached to the structure. In this paper, the adequacy of utilizing passive vibration absorbers are investigated. The vibration absorber system is designed to minimize the vibration of a thin plate fixed along edges. The plate's vibration characteristics, such as, natural frequency and mode shape are determined using three techniques: theoretical equations, finite element (FE) analysis and experiment. The results demonstrate that the first four natural frequencies of fixed-fixed ends plate are 48, 121, 193 and 242 Hz, and these results are corroborated well with theoretical, FE simulation and experiment. The experiment work is further carried out with attached single and multiple vibration absorbers onto plate by tuning the absorber's frequency to match with the excitation frequency. The outcomes depict that multiple vibration absorbers are more viable in lessening the global structural vibration.

Study of Vibration Absorbers Using Epoxy Reinforced Natural Fibers

“…3a-d, it was concluded that four absorbers attachment is more effective to reduce the vibration amplitude of a beam. This result thus corroborated well with our previous findings [3,4]. …”

“…Apparently with adding vibration absorbers, the vibration amplitude of beam reduces significantly, although the result of without attached absorber was not shown in the manuscript. This is because it has been proved in our previous study [2][3][4], that the addition of absorber can minimize the vibration amplitude. From Figs.…”

“…However, the major drawback of vibration absorber is only adapted to one single excitation frequency and not capable to reduce the global structural vibration comprehensively. This is where multiple passive vibration absorbers are obliged in order to achieve this objective [3][4][5].…”

Theoretical modelling of a beam with attached spring-mass-damper system

“…Again it shows that the theoretical equation plotted by Matlab® is almost identical with numerical of Ansys®. It is found that by adding SMD to a beam has significantly reduce the displacement amplitude about 30% and this was agreed with our previous findings [16][17][18][19][20]. Thus indicates that the derivation of mathematical equation of a simply supported beam with attached SMD was successful.…”

“…Assuming the Young's modulus E, cross sectional area A, area moment of inertia I and density ρ are constant along the beam length L, the equation of motion for a simplysupported beam can be expressed by [20]: …”