SU1574751A1 - Sound-isolating building member - Google Patents

Abstract

The invention relates to noise reduction devices and can be used to construct structures with increased sound insulation requirements in the low frequency region. The purpose of the invention is to expand the frequency domain of increased sound insulation. For this, in a building element consisting of two or more layers of parallel in each layer and perpendicular in adjacent layers of pipes 1.2 with a filling of 3 intervals between them, the diameter D of the pipes satisfies the relation D = (0.89 - 0 , 98) √ABH / √A ² + B ² , where A, B is the length and width of the element

H is the wall thickness of the pipes, and vibration-absorbing material, such as plastic Agat or VML-25 or Anti-vibration mastic, is used as the filling material 3. Pipes can be made of metal, plastic and other building materials and are rigidly interconnected by forming pipes by gluing, welding or brazing. Experimental data show that when going beyond the above ratio, the area of increased sound insulation changes by 35%. 4 il.

Description

G 3 2

CD J

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3 joint venture

7

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FIG. one

The invention relates to noise control and can be used to construct structures with increased requirements for sound insulation in the low frequency region.

The purpose of the invention is to provide effective sound insulation in the low frequency region.

FIG. 1 shows a part of the construction element, side view; in fig. 2 shows section A-A in FIG. one; in fig. 3 - part of a variant of a cylindrical shape building element; in fig. 4 - frequency characteristics of sound insulation of a flat element made of two layers of aluminum pipes with Ј 7-1010Pa with filling of the gap between the pipes with vibration absorbing material “Agate” 5 mm thick, 1X1 m2 in size.

The building element consists of two or more layers of parallel rows of rigidly connected along

Significantly, the waves falling at different spatial angles than from layer 1 The sound insulation of the panel is determined by the formula

(2cro

),

where ro, co - density and speed of sound in the environment;

t is the unit mass;

h - panel loss factor;

ω is the circular frequency; (- resonant frequency of the panel.

Since the sound insulation of a building element is difficult to determine by calculation, the values of the resonant frequencies of the flexural vibrations fp were determined experimentally, and the sound insulation calculated by the formula.

By measuring the values of the resonant frequencies of an element made of pipes of different diameters, the optimum forming hollow pipes 1, 2 was obtained. The pipes can have a 20 ratio for the diameter and thickness

be made of metal, plastic, rubber, cement, cane, bamboo, etc., and rigidly interconnected by gluing, welding or welding. Pipes in adjacent layers are arranged in mutually perpendicular directions. The space between the pipes is filled with vibration-absorbing material, for example, plastic Agate or VML-25 or mastic brand Anti-Vibrator.

The element may have a cylindrical shape (Fig. 2).

The construction element works as follows.

The sound wave falls on the first layer of pipes 1. A part of the energy of the incident sound wave is reflected from this layer, the rest part passes through layer 1 and falls on filling 3 of the vibration-absorbing material. Here, too, there is a separation of the sound wave into reflected and past. In addition, part of the energy of the sound wave is absorbed by the vibration-absorbing material — it is converted into heat. The wave reflected from the vibration-absorbing layer returns to layer 1. The transmitted wave falls on layer 2 of the tubes located in the direction perpendicular to the tubes in layer 1. Here too, the sound wave is divided into reflected and transmitted. Since the pipes in layer 2 are located in the direction perpendicular to the pipes in layer 1, preins of the pipe will be reflected.

Ј (0.89-0.98)

25

a}

+ where D is the diameter of the pipes;

h is the pipe wall thickness;

a is the length of the element;

b - the width of the element

wherein the frequency domain of the enhanced 30 beeps is expanded. FIG. Figure 4 shows the dependences of sound insulation for Oopt (curve I) and foopt + Df, (curves II and III). At 25 photons, the area of increased sound insulation changes by 35%.

35

40

Claims (1)

Invention Formula A sound insulating building element comprising layers of pipes parallel in each layer and perpendicular in adjacent layers, with filling gaps between the layers, characterized in that, in order to ensure effective sound insulation in the low frequency region, the diameter of the pipes D satisfies the ratio 45 (0.89--0.98) rj-, G2, where a, b is the length and the element width, h is the thickness of the pipe walls, and vibration-absorbing material was used as the material for filling the gaps between the layers. Significantly, the waves incident at different spatial angles than from layer 1. The sound insulation of the panel is determined by the formula (2cro ), where ro, co - density and speed of sound in the environment; t is the unit mass; h - panel loss factor; ω is the circular frequency; (- resonant frequency of the panel. Since the sound insulation of a building element is difficult to determine by calculation, the values of the resonant frequencies of the flexural vibrations fp were determined experimentally, and the sound insulation calculated by the formula. By measuring the values of the resonant frequencies of an element made of pipes of different diameters, an optimum ratio was obtained for the diameter and thickness  the ratio is pipe walls Ј (0.89-0.98) a} + where D is the diameter of the pipes; h is the pipe wall thickness; a is the length of the element; b - the width of the element wherein the frequency domain of the enhanced sound insulation expands. FIG. Figure 4 shows the dependences of sound insulation for Oopt (curve I) and foopt + Df, (curves II and III). At 25 photons, the area of increased sound insulation changes by 35%. Invention Formula A sound insulating building element comprising layers of pipes parallel in each layer and perpendicular in adjacent layers, with filling gaps between the layers, characterized in that, in order to ensure effective sound insulation in the low frequency region, the diameter of the pipes D satisfies the ratio 45 (0.89--0.98) rj-, G2, where a, b is the length and the element width, h is the thickness of the pipe walls, and vibration-absorbing material was used as the material for filling the gaps between the layers. A - A 12 FIG. 2 ABOUT Fig.Z