Design of Variable Stiffness and Variable Damping Vibration Absorber

The vibration absorbers are frequently used to control and to minimize excess vibration in structural systems. To reduce the vibration of the main system or machine, the frequency of absorber should be equal to the excitation frequency. This result in subcomponent of total structure adding large input impedance to the primary structure, thus 'absorbing' the internal energy transferred to form primary structure. The aim of this work is to design the tunable vibration absorber (TDVA) for vibration control of primary beam system using finite element method through an Ansys Programming. Its stiffness can be varied to adapt the changes in excitation frequencies. Traditional means of vibration control have involved the use of passive and active methods. This study involves the design of variable stiffness vibration absorber by incorporating the use of lead screw for varying the stiffness of secondary system. Finite element analysis is done for the dynamic vibration absorber. FEA code is generated using Mat lab software to find numerical performance of beam structure with dynamic vibration absorber. The proposed absorber is suitable for vibration isolation of beam structure with uniform cross-section and facilitates vibration attenuation at variable excitation frequencies.