Tuning the mass density and bulk modulus independently is the key to manipulate the propagation of sound wave. Acoustic metamaterials provide a feasible method to realize various acoustic parameters. However. the relevant studies are mainly concentrated in air. https://safeersappliancers.shop/product-category/neff-d95bmp5n0b-n70-built-in-90cm-5-speeds-a-chimney-cooker-hood-stainless/