Influence of Chiral Lattice on Modal Characteristics of Structures

Design of mechanical structures for aeronautical applications is mainly aimed towards maximizing the strength-to-weight ratio and alleviating the vibratory response to the maximum extent so that the stresses are well below the endurance limit. The present paper aims to bring out features that fulfil these requirements. An innovative approach is the introduction of a chiral lattice in the structure that can enhance the damping in structure through intentional deformations in the chiral webs and that can also be tuned to act as vibration absorbers to reduce the overall vibratory response of the structure. The design features suggested can be successfully implemented in components like aerofoils, engine carcass, blisks and disks. This is possible due to the advent of 3D printing technology. The paper aims to bring out these aspects by considering a simple cantilever beam with a chiral lattice internal to it. Further parametrization of geometric designs is undertaken to understand the vibratory response characteristics.