SU1260469A1 - Sound-absorbing block and method of producing same - Google Patents

Abstract

The invention relates to construction and is intended for use in 3 rooms of industrial and civil buildings. It allows you to improve manufacturability and expand design opportunities. The resonator cavities 4, located in the housing 3, are filled to varying degrees with hermetic material 5, due to which the cavities, located in different rows, have different free volume, limited to the bottom 6. When the unit is manufactured, the body with tubular re - zonansnym cavity and open bottom. The front wall 1 with openings 2 can be made integral with the housing or separately. Then the housing is lowered with an open bottom into the liquid hardened material with an inclination, the material entering the cavities is cut off, the housing is removed from the liquid hardening material and the liquid hardening material is cured in a cavity 4. 2 s. item f-ly, 2 ill. i (L and; o (pus.

Description

The invention relates to construction and is intended for use in industrial and civil buildings.

The purpose of the invention is to improve the manufacturability and expand the design capabilities of the sound-absorbing unit.

FIG. 1 shows a sound absorbing unit; in fig. 2 shows a variant of a block with solidified liquid material with a horizontal arrangement of the block.

The sound-absorbing unit contains a front wall 1 with openings 2 - resonator throats, a block case 3 with openings - resonant cavities 4, filled to varying degrees with hermetic material 5, due to which cavities 4, which are in different rows, have different free volume limited by the bottom 6.

The wall 1 and the body of the block 3 can be made of any materials, for example building materials - concrete, gypsum, etc. With the use of blocks in cultural and living rooms, the wall 1 can be made in the form of a ceramic plate. The hermetic material 5 may also be different, however it is more expedient to accept the material from which the block body is made.

In the manufacture of the block, a body 3 is first formed with tubular resonant cavities 4 and an open bottom. The front wall 1 with the openings 2 can be made integral with the housing 3 or separately, for example, in the form of ceramic tiles and connected to the housing by known methods. Then the housing is lowered with an open bottom into a liquid hardening material 5 with an inclination that ensures the surface of the liquid hardening material coincides with a common inclined plane, cut off the material wrinkling in the cavity of the resonators 4, remove the housing from the liquid material 5 and solidify the liquid hardening material in the cavities of the resonators at inclined or horizontal position of the housing, forming the bottom of 6 resonators. Accordingly, a resonant sound-absorbing unit according to FIG. 1 or 2 with a wide range of silenced frequencies.

From sound-absorbing blocks, walls or partitions are built that are located along the path of sound waves propagation — a broadband schuma. The energy of the sound wave incident on the front wall 1 is partially dissipated in the cavity of the holes 4 and partly on the losses in the holes 2. Although the Helmholtz resonators have a sharp selectivity, i.e. They have a high noise-absorbing ability at the resonance frequency and no silencing ability at other frequencies, they have a practical sound-swamping ability not only at the resonant frequency, but also in a certain narrow frequency band. This bandwidth is equal to

Af

where Ko is the wavelength corresponding to the resonance frequency;

V is the volume of the internal cavity of the resonator; fo-own frequency of the resonator.

Thus, by appropriately selecting the difference in the volumes of the cavities of the adjacent rows of resonators, it can be achieved that the bands of the absorbed frequencies of the adjacent rows overlap, i.e. sound-absorbing unit has a high sound-absorbing ability in a wide frequency range, almost equal to

SAf n-Af-k,

where n is the number of rows of resonators with different volumes;

Af is the bandwidth of the bandaged frequencies by one resonator size; - coefficient taking into account the overlap of adjacent bands of silenced frequencies.

Designed sound-absorbing blocks with dimensions of 1000x500x120 mm are effective over the whole range of medium frequencies.

The sound-absorbing unit is technologically advanced, widely used building materials are used for its production, it has high acoustic efficiency. Its use in the national economy creates a socio-economic effect by preserving the health of people and increasing their efficiency.

Claims (2)

1. Sound absorbing unit, including tubular resonators with a variable length block, the bottoms of which are oriented along a common plane inclined to the longitudinal axis of the resonators, characterized in that, with the aim of improving the processability and extending the design possibilities, the bottoms of the resonators are formed of a hermetic material uniformly varying in the cavities of the resonators in adjacent resonators. 2. A method of manufacturing a sound-absorbing unit, including the manufacture of a unit with tubular resonators and an open bottom and the formation of resonator bottoms along a common plane inclined to the longitudinal axis of the resonators, characterized in that when the resonator bottoms are formed, the open bottom unit is lowered into a liquid hardening material with a slope that provides the surface of the liquid hardening material with a common inclined plane, cut off the material entering the cavity of the resonators, remove the block from the liquid ma3 The material hardens the liquid material in cavities when the block is inclined or horizontal. (pus. 2