Forced vibration response of thin plate with attached discrete dynamic absorbers

Forced vibration response of a rectangular thin plate with single discrete mass and patch placed at the centre of plate has been determined using finite element method. The effects of varying thickness or area of patch on the dynamic vibration absorption has been analysed. Results show that single discrete mass/patch at the centre of the plate may act as dynamic vibration absorbers over certain frequency range. Simply increasing the weights of discrete mass/patch does not improve the vibration absorption over the entire frequency range of 0-1000 Hz. Further, a few discrete masses are better than discrete patches for vibration absorption over the entire frequency range. Also, there is optimal weight of the discrete mass for which vibration absorption is optimum. There exists optimal thickness of patch for a given area as well as an optimal area of patch for a given thickness, for which patches behave optimally as dynamic vibration absorbers.