Microstructure Design and Performance Optimization of Constant Modulus Pentamode Materials Acoustic Cloak

Underwater acoustic stealth has great scientific research value. According to coordinate transformation theory, the cloak based on pentamode materials can realize underwater broadband stealth. However, due correlation between density and modulus of changes in parameters each layer cloak, a large amount structural optimization work is required for material meet specific parameter requirements, which significantly increases difficulty design. To simplify design process, inspired by calculation equivalent representation volume element, this article proposed configuration with independent variation designed 1 m radius structure matching equation constant modal mapping. After simulation design, range a/λ from 0 1, average total scattering cross-section cavity 0.5 covered 0.858; 19.718 after removing cloak. The results study are expected provide some method references simplifying process microstructure materials.