Modelling of an adjustable TMD incorporating an elastomeric O-ring

This paper investigates the performance of adjustable Tuned Mass Dampers (TMDs) using elastomeric O-rings when applied to a flexible structure. Properties of this type of TMD are adjusted by altering the pre-compression on the O-ring. Analytical and finite element models are established. Nonlinear behaviour arises because of the nonlinearity the rubber material itself and because of geometry. Energy loss of O-rings is estimated using the complex modulus. Overall, it is shown that the dynamic characteristics of a regular O-ring can be predicted with reasonable accuracy. Followed this, FE models were established and were used to estimate the performance of rings with irregular cross section shapes. The performance of this adjustable O-ring TMD was evaluated in a flexible structure – a clamped hollow beam on flexible end supports. It was shown this TMD can suppress the two selected vibration modes for this beam when the proper static compression was applied to the O-ring.