Structure that can channel an elastic wave propagating in a plate

摘要

A structure for bending transversal elastic waves around a zone to isolate of a plate, has an anisotropic Young's modulus and/or a heterogeneous mass density. The wavelengths of the elastic waves to bend are large with respect to the thickness of the plate and small with respect to the other dimensions of the plate. The structure is made by defining a meshing of a peripheral zone surrounding the zone to isolate; dividing the peripheral zone into several elementary rings and several elementary angular sectors; and forming, in each mesh delimited by an elementary angular sector and an elementary ring, a structural element in a material having a Young's modulus and/or a mass density different than those of the material forming the plate, the dimensions of the meshes and of the structural elements in the plane of the plate being less than half the wavelengths of the elastic waves to bend.

主权项

1. A method for bending transversal elastic waves travelling through a plate, around a zone to isolate of the plate, the plate being made in a solid material and having a thickness small with respect to wavelengths of the elastic waves to bend, the method comprising:
defining a meshing of a peripheral zone of the plate, the peripheral zone surrounding the zone to isolate, the meshing being defined by:
dividing the peripheral zone into several elementary rings centered on the zone to isolate and into several elementary angular sectors having an origin located in the zone to isolate; andforming in the plate, in each mesh of the meshing, delimited by an elementary angular sector and two adjacent elementary rings, a structural element having a Young's modulus or a mass density different than those of the material forming the plate, the meshes and the structural elements having dimensions in a plane of the plate smaller than half the wavelengths of the elastic waves to bend, the plate and the structural elements forming in the peripheral zone a structure having an anisotropic Young's modulus or heterogeneous mass density.