RU35355U1 - Device for reducing the energy of acoustic vibrations emanating from a solid surface - Google Patents

Description

Device for reducing the energy of acoustic vibrations emanating from a solid surface

The utility model relates to construction and can be used to reduce noise in residential, public and industrial premises, mainly to increase the sound insulation of building envelopes.

A device is known for reducing the energy of acoustic vibrations emanating from a solid surface, including a two-layer plate consisting of a first layer with a coefficient of energy loss of acoustic vibrations K and a second layer facing a solid surface with a coefficient of energy loss of acoustic vibrations having N holes for fixing it to the surface, the walls of one or more of which are covered with a material with a coefficient of energy loss of acoustic vibrations, N is a natural number (RU, Patent No. 2140498, ЕВВ 1/86, 1999).

The known device does not sufficiently reduce the energy of acoustic vibrations emanating from a solid surface.

The technical result from the use of the proposed device is to achieve a greater reduction in the energy of acoustic vibrations emanating from a solid surface.

The specified technical result is achieved in that in a device for reducing the energy of acoustic vibrations emanating from a solid surface, including a two-layer plate consisting of a first layer with an acoustic energy loss coefficient KI and a second layer facing a solid surface, an acoustic vibration energy loss coefficient having N holes for attaching it to the surface, the walls of one or more of which are coated with

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the coefficient of energy loss of acoustic vibrations N is a natural number, the first layer of a two-layer plate is made of metal or an alloy of metals or glass or ceramic or wood or plastic or gypsum board or gypsum fiber or wood-based or wood-fiber material or plywood.

The specified technical result is also achieved by the fact that the second layer of the two-layer plate is made of a homogeneous fibrous or viscoelastic material.

The specified technical result is also achieved by the fact that the viscoelastic material is rubber or rubber or a natural or synthetic resin or organosilicon liquid, in particular silicone, or a chemical fiber or foamed polymer, in particular polyethylene or polypropylene, or mineral fiber, in particular basalt or fiberglass.

The specified technical result is also achieved by the fact that the entire internal volume of one or more holes is filled with material with a coefficient of acoustic energy loss Kz.

The coefficient of energy loss of acoustic vibrations is a value proportional to the ratio of the energy lost in the system during the circular cycle of oscillation to the energy re-entered into the system (Reference Acoustic Technique. Edited by M. Hekl and H. A. Muller. - L. , Shipbuilding, 1980, p. 407).

Figure 1 shows the proposed device.

A device for reducing the energy of acoustic vibrations emanating from a solid surface comprises a two-layer plate consisting of a first layer 1 with an acoustic energy loss coefficient Ki and a second layer 2 with an acoustic energy loss coefficient Ka, with N through holes 3 filled with material 4 with a coefficient of energy loss of acoustic vibrations KZ. The device operates as follows. Acoustic vibrations emanating from

surfaces passing through each layer of a two-layer plate are partially reflected from them and partially absorbed by them, reducing the energy of acoustic vibrations from plate to plate. The main element that absorbs the energy flow of acoustic vibrations are the second layers 2 made of sound-absorbing material. The main element reflecting the flow of energy of acoustic vibrations is the first layer 1, made of a material with a high density. Holes made in a two-layer plate during their manufacture and pre-filled with vibration-absorbing (with a high coefficient of acoustic energy loss) material 4, make it possible to attach the device to a surface with a high degree of vibration isolation of the surface and the device. An additional attenuation of the oscillation amplitude at the frequencies of wave coincidence is achieved by increasing the acoustic loss coefficient of the entire device due to the use of sound-absorbing material.

3

Claims (4)

1. A device for reducing the energy of acoustic vibrations emanating from a solid surface, comprising a two-layer plate consisting of a first layer with an acoustic energy loss coefficient K ₁ and a second layer facing a solid surface with an acoustic vibration energy loss coefficient K ₂ > K ₁ having N holes for fixing it to the surface of one or more walls of which are coated with a material with energy loss factor acoustic vibrations K _3> K _1, N - natural number, characterized in that the first layer vusloynoy plate made of a metal or metal alloy or glass, or ceramics, or wood, or plastics, or drywall, or gipsovolokna or woodchip or wood fiber material or plywood. 2. The device according to claim 1, characterized in that the second layer of the two-layer plate is made of a homogeneous fibrous or viscoelastic material. 3. The device according to claim 2, characterized in that the viscoelastic material is rubber or rubber, or a natural or synthetic resin, or an organosilicon liquid, in particular silicone, or a chemical fiber, or a foamed polymer, in particular polyethylene or polypropylene, or mineral fiber, in particular basalt or fiberglass. 4. The device according to any one of claims 1 to 3, characterized in that the entire internal volume of one or more holes is filled with material with a coefficient of energy loss of acoustic vibrations K ₃ .