A deflect-plate for a frame of a building includes a lower wall, an upper wall above the lower wall and in spaced apart facing relation with the lower wall, and a plurality of spring members connecting the lower wall to the upper wall. In some embodiments, a first one of the spring members deflects inwardly in response to a vertical force on the upper wall, and a second one of the spring members deflects inwardly in response to a vertical force on the upper wall.

An acoustic curved ceiling baffle and system that incorporates sidewalls with cuts or kerfs, top and bottom spines and ribs to properly configure the curves in the acoustic baffle, and that can be quickly and easily installed onto ceilings using integrated locks, cables or magnets, to produce a curved baffle system, and to provide an aesthetically pleasing image, along with a reduction in unwanted noise and/or room acoustics.

There is provided a soundproof structure that is small and has high soundproofing performance with respect to sound in a low frequency band. At least one soundproof cell including a frame having a hole portion and a film fixed to the frame is provided. The film has a surface density distribution. Assuming that a shortest line segment length between high surface density regions and between the high surface density regions and end portions of the hole portions is d, a longest line segment length between the end portions of the hole portions is L [m], a Young's modulus of a material of the low surface density region is E [Gpa], an average film thickness of the low surface density region is h [m], and a maximum surface density and a minimum surface density of the film are max and min, a parameter X in the following Equation (1) satisfies the following Inequality (2).
X=Eh.sup.2/(max/min)[N](1)
(d/L0.025)/(0.06)[N]X[N]10 [N](2)

Embodiments described herein are directed to a sound-dampening baffle and lighting apparatus and methods of production therefor. In one embodiment, a sound-dampening baffle and lighting apparatus is provided that includes a structural frame which provides support for a sound-dampening outer layer and a light source. The sound-dampening outer layer is disposed around the structural frame. The sound-dampening baffle and lighting apparatus also includes a light source disposed on the structural frame. The light source is directionally switchable so that light emanating from the light source points upward, downward or both.

Embodiments described herein are directed to a sound-dampening baffle and lighting apparatus and methods of production therefor. In one embodiment, a sound-dampening baffle and lighting apparatus is provided that includes a structural frame which provides support for a sound-dampening outer layer and a light source. The sound-dampening outer layer is disposed around the structural frame. The sound-dampening baffle and lighting apparatus also includes a light source disposed on the structural frame. The light source is directionally switchable so that light emanating from the light source points upward, downward or both.

An example acoustic tile is disclosed having a structure with at least one layer. A plurality of openings are formed in the at least one layer of the structure. The openings are configured to direct sound waves hitting the structure in multiple different directions through the at least one layer to absorb a majority of the sound waves and inhibit the sound waves hitting the structure from reflecting off of the structure. In an example, the openings are juxtaposed, different sizes, different orientations, and/or different numbers of openings on separate layers.

Provided is a soundproof structure with a small size and high soundproofing performance of a low frequency band. The soundproof structure includes at least one soundproof cell which includes a frame having a hole portion, an elastic layer laminated on a frame of one opening surface of the frame, and a film laminated on the elastic layer so as to cover the hole portion. An effective displacement amount at a position at which an amplitude is maximized in a region bonded to the elastic layer in a case where a film vibration of the film occurs is 0.4% to 10% of an effective displacement amount at a position at which an amplitude of the film is maximized.

An acoustic absorber includes a chamber formed from walls with a resistive portion providing the only communication between the chamber volume and ambient air. In some examples chamber walls enable selection or adjustment of chamber volume or resistive area, thereby altering the acoustic absorption spectrum below 250 Hz. In some examples the chamber volume contains fibrous filler material exhibiting no airflow resistance or acoustic absorption. Density and heat capacity of the fibrous filler material results in the chamber volume exhibiting compressibility of air within the chamber, for at least acoustic frequencies up to about 50 Hz, that is larger than adiabatic compressibility of air. That larger compressibility results in an increased acoustic absorption coefficient, for at least acoustic frequencies up to about 50 Hz, 50% to 100% larger than that of an identical chamber entirely characterized by the adiabatic compressibility of air.

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.

The present invention relates to a meltblown nonwoven in the form of a sheet-like formation with a weight per unit area of 100 to 600 g/m.sup.2 and with a density of 5 to 50 kg/m.sup.3, wherein the meltblown nonwoven (10) has at least one spacer (12), extending at least on one of the surfaces thereof and/or at least partially in the direction of the thickness of the meltblown nonwoven (10) and arranged in such a way that the meltblown nonwoven (10) has a compressibility of less than 10% when a pressure of 50 Pa is applied to its surface.