Membrane-imbedded metamaterials have great potential applications in noise reduction in a low frequency range, and anisotropic mechanic properties of the materials can be easily achieved by artificially adjusting membrane parameters. Effects of the membrane parameters on equivalent elastic moduli of the 3D embedded membrane acoustic metamaterials are investigated firstly. And then, in order to demonstrate how to manipulating acoustic waves by the membrane-imbedded metamaterials, the transformation acoustics method is employed to design the equivalent material parameters according to given wave propagation paths. Finally, several numerical examples are presented to illustrate abilities of the 3D embedded membrane acoustic metamaterial to control wave propagation.
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