Influence of the footprint of resonant additions on the stop band behaviour of ID locally resonant metamaterials.

摘要

Due to trends towards the use of lightweight structures, novel low mass and compact NVH solutions are necessary in order to tackle the challenges of not only achieving a good NVH reduction performance but also the lightweight imposed requirements. Metamaterials have been ensuring proven to hold great potential to enhance the vibro-acoustic response of several engineering applications. They are made from conventional materials and due to the dynamic interaction between resonant additions and the host structure, metamaterials can create stop band behaviour, i.e. frequency zones of strong vibration and/or noise attenuation. Various design parameters have been shown to have influence on the achieved stop bands. One of these design parameters is the footprint of the resonant addition e.g. the size of the contact area between the resonant addition and the host structure. The present paper investigates numerically and experimentally the influence of the footprint on the stop bands by using ID finite metamaterial structures. It is shown that this design parameter affects both the stop bands width as well as the stop band location in the frequency domain.