Micro Perforated Plate

Note the reduced hole cross section depicted in the photomicrograph.

Micro perforated plate.

An mpp offers an alternative to traditional sound absorbers made from porous materials. Sorberscreen micro is a unique micro perforated metal sound absorber. 0 06 thick x 0 1875 hole x 0 375 stagger stainless perforated sheet 316 round hole. Micro mesh offers a wide range of perforated metal sheets punched in mild steel galvanised aluminium stainless steel and special alloys.

Moreover photo etched media may not be available in the same sheet sizes aperture sizes densities and alloys as micro perforated plate. Before the study of maa they were used only as protective layer for classical sound absorbers mpps are plates with small perforations whose diameter is in the order of 10 1 mm with low porosity values i e. Photo etched media offers strength uniform pore size a smooth finish. Perforated steel sheet is a sheet product that has been punched with a wide variety of hole sizes and patterns providing an aesthetic appeal.

ϕ o. Perforated steel sheet offers savings in weight passage of light liquid sound and air while providing a decorative or ornamental effect. Please refer to the technical data sheet tds for more information. Perforated steel sheets are common in interior and exterior design.

In the present work two types of mpp s have been investigated. It eliminates the need for flow resistive textile backing as used on conventional perforated metal screen products. We also can make the design punch tooling suitable for many architectural metal and decorative metal uses. In this paper a model for the sound absorption coefficient of multi layered elastic micro perforated plates mpps in an impedance tube is developed using an analytical approach.

Micro perforated plates mpps have been designated as high potential sound absorbers by maa for various applications including the ones with severe environments. However it may be a very costly solution. I plates with circular holes and ii plates with slit shaped holes. Perforated materials are used mostly as screens filters shields and guards perforated materials can control the passage of air liquid light solids heat electromagnetic waves and sound waves.

Under the plane wave condition a low frequency solution is derived by including the symmetric modes of the plate vibration and the sound pressure field.