To simultaneously address low to mid frequency noise absorption and stringent thickness constraints,a novel cross-bridged hex structure with embedded necks was developed from conventional honeycombs.The acoustic perfo...To simultaneously address low to mid frequency noise absorption and stringent thickness constraints,a novel cross-bridged hex structure with embedded necks was developed from conventional honeycombs.The acoustic performance of these metamaterials was systematically investigated via theoretical analysis,experimental verification,and numerical simulation.Results demonstrate that an exponential 2 penalty factor objective achieves superior uniformity of sound absorption within 500−1000 Hz band,surpassing both average-driven and multi-level reward methods.Among the four tested optimization algorithms,a hybrid CMAES+LBFGS scheme reduced the final penalty by up to 98%,highlighting its capacity for effectively navigating the complex design space of cross-bridged structures.展开更多
基金Project(2024RC1019)supported by the Science and Technology Innovation Program of Hunan Province,ChinaProject(23A0017)supported by the Key Project of Scientific Research Project of Hunan Provincial Department of Education,ChinaProject(2023JJ31015)supported by the Natural Science Foundation of Hunan Province,China。
文摘To simultaneously address low to mid frequency noise absorption and stringent thickness constraints,a novel cross-bridged hex structure with embedded necks was developed from conventional honeycombs.The acoustic performance of these metamaterials was systematically investigated via theoretical analysis,experimental verification,and numerical simulation.Results demonstrate that an exponential 2 penalty factor objective achieves superior uniformity of sound absorption within 500−1000 Hz band,surpassing both average-driven and multi-level reward methods.Among the four tested optimization algorithms,a hybrid CMAES+LBFGS scheme reduced the final penalty by up to 98%,highlighting its capacity for effectively navigating the complex design space of cross-bridged structures.
