Study of Vibration Absorption Characteristics of Membrane-Type Resonators with Varying Membrane Configurations

The work is aimed to study a membrane-type resonator for improving its vibration absorption characteristics. Previous studies have utilized a membrane-type resonator, consisting a pre-stressed membrane decorated with mass, for sound absorption applications. However, there has been limited studies done on this type of resonator for structural vibration control, particularly in studying the relationship between the vibration absorption properties and the membrane's configurations. The membrane-type resonator's capability in attenuating structural vibration is investigated using a mass-loaded membrane model. The decorated mass's location over the membrane and its effect to vibration mode shapes, and consequently to vibration absorption properties, are investigated. Sensitivity analysis is performed to study the effect of varying the pre-stress level, boundary conditions, and geometrical shapes of membrane to the frequency bandwidth in which effective vibration control can be achieved. Also, the relationships between pre-stress value and the corresponding resonance frequency changes in different membrane geometries are explored. This research suggests that by changing the configurations of membrane resonator, structural vibration absorption performance can change significantly.