Good acoustical behavior is one of the most important factor in the light-weight design. The acoustic metametamaterials are promising solutions to achieve the improvements in this field. With their repeat- ing structure in periodicity, an excellent sound reduction effect can be achieved. According to the litera- ture research, there are various of acoustic metamaterial designs with different materials and structures. However, there are still challenges to find a model, which can be both manufactured and simulated and meanwhile the results agree with each other.
On the one hand, the manufacturing method (3D-printing technology) has error potentials when building small-size models. This will lead to a wrong value in experiments. On the other hand, the simulation environment is idealized, which cause a deviation between simulation results and experimental results. Obviously, the acoutic physical domain has some unavoidable uncertenties. It is difficult to explore the propagation of acoustic waves in different media materials.
This thesis aims to propose possible acoustic metamaterial designs based on the literature research. These models can be both manufactured by 3D-printing technology and simulated in software. The focus of thesis is to find a simulation process, in which the experiments machted results can be calculated. The properties of acoustic metamaterials, which can be evaluataed and compared by experiments and simulations, are also explained and analyzed.
The first few chapters give an overview about state of the art. The history and development as well as categories of metamaterials are introduced. After that, the important physical parameters and academica models as well as possible analytical methods of acoustical metamaterials are explained. Possible math- ematical calculation methods are compared with Finite-element method specially for software. Based on the literature research different prototype designs are proposed. Before explain the simulation process in details, the possible simulated properties are analyzed and compared. In order to improve the simulation results, the convergence study is executed. In the end, the challenges and possible improvements are summarized.
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Good acoustical behavior is one of the most important factor in the light-weight design. The acoustic metametamaterials are promising solutions to achieve the improvements in this field. With their repeat- ing structure in periodicity, an excellent sound reduction effect can be achieved. According to the litera- ture research, there are various of acoustic metamaterial designs with different materials and structures. However, there are still challenges to find a model, which can be both manufact...
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