New Approaches to Design of Structures with Required Vibroacoustic Properties

Two approaches to control the vibration and acoustic fields of composite mechanical structures that are being developed in the A.A. Blagonravov Institute are presented. One approach is based on the use of coatings made of acoustic or mechanical metamaterials. Another approach is based on controlling coupling between substructures. A new impedance theory of fluid-structure interaction and composite structural vibrations is a key point of the approaches. Examples of application of the approaches for two practical problems are given. One problem is the construction of a nonscattering acoustic coating, and the other is the design of mechanical structures of space instruments of minimal mass with prescribed strength and vibroacoustic properties.