FR2501886A1 - Sound absorbing screen panel - has separate panels of expanded metal and metal shavings with sound deadening material and protective sheets - Google Patents

Abstract

The panel forms a sound deadening, non-vibratory screen. It is made up of four main elements, each with a separate function, but complementary to the others. A first plate (A), nearest to the sound, has a panel of expanded metal forming deflectors facing towards the inside. Behind this is a panel of metal shavings (B) in a maze of high density. The third layer is a protective cover for this followed by a panel of sound insulating material (D).

Description

ACOUSTIC SCREENS, anti-reverberant and anti-noise "Absorbent" modules.

The present device is intended to "absorb" the sound waves which in principle are electro-thermal and also to deflect and distribute the waves.

For this purpose each Screen Module consists mainly of four main elements each having its own function and different densities.

By way of example, the characteristics and advantages of the invention will emerge moreover from the following description, given with reference to the appended drawings, in which, according to sheet nO I, FIG. I represents a section of a "Module" , and the mark A indicates a panel serving as weather protection on the upstream side and also as a distributor of sound waves and the like on the "absorbent mattress" mark B placed just behind this first screen.

This metallic "mattress" mark B is made of intertwined metallic fibers, or made of stretched metal panels or the like so that the fibers cannot settle under the effect of possible vibrations.

These high density fibers are "absorbent" of acoustic waves and the thickness of the "mattress" is a function of the acoustic intensity to be absorbed.

Mark C is a weather protection panel on the downstream side of the screen.

This panel can be metallic or in molded material or concrete, etc.

It also constitutes an acoustic barrier and a reinforcement of the rigidity of the modules.

 I1 can be completed with thicknesses of material isolanphonetically - mark D.

In a different assembly but with the same principle and in accordance with FIG. 2, shows a section of a module whose absorbent effect is effective on both sides.

The central 11Matelas "mark B is identical and retains its same properties - panel A also, but the panel
C is replaced by another A bis deflector and protective panel.

All of these elements are mounted together, tight against each other: the assembly can be arbitrary (bolts, spacers, hooks, welds, etc.)
The panels A and A bis may be made of steel, aluminum, copper or other plastic materials, ground or drawn, made up of fins or louvers, but must necessarily be deflectors of the waves towards the interior of the device.

The "Mattress" reference 8 is in principle metallic but could also be made of a rot-proof material which would absorb acoustic waves.

The dimensioning of the notches is not limiting.

Claims (1)

REVENDICATIOPIS I) Modules constituting acoustic screens "anti-reverberant" and absorbing "sound waves, characterized in that they consist of four main elements each of which has a different action complementary to the others, namely: A first plate, fixed on the side of the source of the noises, consists of a stretched or stamped motel panel, forming fins or louvers deflecting sound and other waves towards the interior of the device, by equally distributing these waves over all te the surface of the "Absorbent Mattress". This first plate also serves to protect against bad weather. The "Absorbent Mattress" placed directly behind the deflector panel is made up of metallic fibers in hanks or rigid agglomerated panels like strong metallic grids. density (these agglomerated panels avoiding any settling under the effect of possible vibrations) The action of these "Mattresses" is to force the waves received s to walk along the fibers by imposing a very high load loss and to dislocate the lengths of acoustic waves received. Behind this absorbent mattress is a protective plate for the downstream face which also serves as a stiffener for the entire device. This plate can be supplemented by elements of insulating material completing the general soundproofing. 20) Modules constituting anti-reverb acoustic screens4-  rants and Absorbent sound waves, according to the income  dication n I,  characterized in that in a different version the  modules have absorption and anti-reverberation efficiency  beration on both sides:  in this type of module, the downstream protection panel  is removed and replaced with a deflector panel  identical to that of the upstream face. The central mattress  "Absorbent" remains identical and has the same function and ef  modules constituting anti-re acoustic notches  verbant and Absorbent sound waves, according to  claims I and 2,  characterized in that all these elements are mounted  united, pressed against each other parallel  Lement: the assembly can say any (by bou  lons, rods, hooks, spacers or welds, etc.) 40) Modules constituting anti-reverberation acoustic screens  berants and Absorbent sound waves, according to reven  dications I, 2, 3,  characterized in that the general shape of the device  can variable, rectangular or cylindrical or  multi-faceted or other and the dimensions are equal-  non-limiting as well as the thicknesses which are  determined according to the soundproofing sought.