The present invention is directed to an acoustic ceiling panel having a first major exposed surface opposite a second major exposed surface, the acoustic ceiling panel comprising: a first layer having an upper surface opposite a lower surface, the first layer comprising: a first body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the first body being air-permeable; and a first attenuation coating applied to the first body; a second layer having an upper surface opposite a lower surface, the second layer comprising: a second body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the second body being air-permeable; and a second attenuation coating applied to the second body; and an adhesive present between the first and second layers.

The present invention is directed to an acoustic ceiling panel having a first major exposed surface opposite a second major exposed surface, the acoustic ceiling panel comprising: a first layer having an upper surface opposite a lower surface, the first layer comprising: a first body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the first body being air-permeable; and a first attenuation coating applied to the first body; a second layer having an upper surface opposite a lower surface, the second layer comprising: a second body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the second body being air-permeable; and a second attenuation coating applied to the second body; and an adhesive present between the first and second layers.

A tile comprises a main body having an exposed side and a concealed side. The exposed side defines a main surface and the concealed side defines a rear plane. Side surfaces between the exposed side and the concealed side of the main body have tongue-and-groove arrangements in the rear plane. The main body is made of at least one layer of acoustic felt defining at least one of the exposed side or the concealed side. The at least one layer of acoustic felt has a main plane of at least one compressed portion, with at least one embossed portion projecting from the main plane of the at least one compressed portion.

The present invention is directed to an acoustic ceiling panel having a first major exposed surface opposite a second major exposed surface, the acoustic ceiling panel comprising: a first layer having an upper surface opposite a lower surface, the first layer comprising: a first body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the first body being air-permeable; and a first attenuation coating applied to the first body; a second layer having an upper surface opposite a lower surface, the second layer comprising: a second body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the second body being air-permeable; and a second attenuation coating applied to the second body; and an adhesive present between the first and second layers.

Provided herein is a system for reducing the overall noise output of equipment used in the hydraulic fracturing of oil and gas wells, by providing a noise-reducing enclosure and/or radiator which substantially reduce the level of noise that reaches the environment during normal operation.

An acoustic-absorber system incorporates a plurality of acoustic-baffle assemblies in cooperation with an acoustic cavity. Each acoustic-baffle assembly incorporates a plurality of nested fluted cups, wherein at least one fluted cup of a first type having at least one orifice at at least one radially-inwardly-extending grooved portion is interleaved with at least one fluted cup of a second type having at least one orifice at at least one radially-outwardly-extending ridged portion. Externally-generated soundwaves entering either from the inside of an innermost fluted cup, or from the outside of an outermost fluted cup, travel through the at least one orifice thereof, and along a circuitous path along the gaps between adjacent cups and through at least one orifice of each of other fluted cups from one gap to another, until finally propagating into the acoustic cavity through at least one orifice of the outermost, or innermost, fluted cup for subsequent additional attenuation by destructive interference from phase cancellation within the cavity.

A tile comprises a main body having an exposed side and a concealed side. The exposed side defines a main surface and the concealed side defines a rear plane. Side surfaces between the exposed side and the concealed side of the main body have tongue-and-groove arrangements in the rear plane. The main body is made of at least one layer of acoustic felt defining at least one of the exposed side or the concealed side. The at least one layer of acoustic felt has a main plane of at least one compressed portion, with at least one embossed portion projecting from the main plane of the at least one compressed portion.

An acoustic-absorber system incorporates a plurality of acoustic-baffle assemblies in cooperation with an acoustic cavity. Each acoustic-baffle assembly incorporates a plurality of nested fluted cups, wherein at least one fluted cup of a first type having at least one orifice at at least one radially-inwardly-extending grooved portion is interleaved with at least one fluted cup of a second type having at least one orifice at at least one radially-outwardly-extending ridged portion. Externally-generated soundwaves entering either from the inside of an innermost fluted cup, or from the outside of an outermost fluted cup, travel through the at least one orifice thereof, and along a circuitous path along the gaps between adjacent cups and through at least one orifice of each of other fluted cups from one gap to another, until finally propagating into the acoustic cavity through at least one orifice of the outermost, or innermost, fluted cup for subsequent additional attenuation by destructive interference from phase cancellation within the cavity.

An embodiment of the present disclosure provides complex curved structures and methods of making the same without requiring specially made frames or the like. These structures may include complex multi-axis, spherical, semi-spherical, twisted, or other like curves, for example. In this illustrative embodiment, individually sized boxes are stacked or assembled to form the structure.

The present invention is directed to an acoustic ceiling panel having a first major exposed surface opposite a second major exposed surface, the acoustic ceiling panel comprising: a first layer having an upper surface opposite a lower surface, the first layer comprising: a first body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the first body being air-permeable; and a first attenuation coating applied to the first body; a second layer having an upper surface opposite a lower surface, the second layer comprising: a second body comprising a first major surface opposite a second major surface and a side surface extending between the first and second major surfaces, the second body being air-permeable; and a second attenuation coating applied to the second body; and an adhesive present between the first and second layers.