LT5308B - Double partition construction with variable sound insulation - Google Patents

Abstract

The invention relates to a partition construction that is designated to increase sound insulation without increasing thickness of the partition and may be used in the construction of residential and office buildings. Double partition construction with variable sound insulation consists of two walls of deferent thickness and materials, an air space, which is filled with an insulation material, a bearing carcass, one or more thin plates which with insulating material are fastened in a way that between carcass and adjacent wall of partition construction is formed an air gap.

Description

1

EN 5308 B 1. Technical Field of the Invention

Dual lining with variable sound insulation is designed to increase the air-sound insulation of dwelling walls of dwellings and to increase the sound insulation of partitions of public buildings. 2. The state of the art

In order to create the acoustic comfort of a living environment, it is necessary to ensure a high level of sound insulation of the interstellar partitions. This can be achieved by using a single layer or a double partition.

The sound insulation of a single-layer enclosure will be the higher the mass and frequency of its 1 m2. Isolation is influenced by the critical frequency of wave coincidence, which is influenced by the mass of the partition, its stiffness, the modulus of elasticity of the material, the energy loss factor. When the barrier fluctuates at its own frequencies, there is a change of energy between its inertial and elastic forces, the energy from the kinetic to the potential, and vice versa. If there is no energy loss in the barrier material, such fluctuations can be sustained continuously without additional external forces. The decrease in the amplitude of the plate fluctuations and the weakness of their own fluctuations are due to energy loss in the material caused by internal friction. When the frequency of the sound source coincides with one of the frequencies of the fluctuations of the plate, it resonates, ie. y. sharp increase in amplitude of fluctuations. The increase in the amplitude of the fluctuations is only determined by the frictional forces that cause the energy loss. By acting on an equally excited external force, the amplitude at resonant oscillations is significantly higher than in the absence of resonant fluctuations. This will result in a much higher sound transmission through the partition and will reduce the sound insulation of the air.

In real constructions, instead of a steady increase in insulation over the entire frequency range, there are observed intervals at which the insulation increases at different rates, as well as intervals where the insulation does not increase or even decrease. Such deviations from the law of mass are due to whale processes and spatial frequencies resonating in the enclosure and in the air of the room. 2

LT 5308 B

The air-sound insulation of single-walled enclosures can only be increased by increasing its space to one unit of space. However, the higher the insulation of the single-layer partition, the lower the increase in insulation due to the increase in mass.

In order to achieve a large partitioning of the enclosure, single-layer massive enclosures are already ineffective. It is then better to use a double partition with an air gap between the walls, which is always completely or not completely filled with sound absorbing material. The insulation of the double enclosure is determined by the mass per unit area of the wall, the thickness of the air gap, and the critical and resonant frequencies of the partition that fills the acoustic properties of the air gap. Constellation, consisting of different plates at one frequency, has different angles of coincidence to which the barrier is most permeable to sound. Therefore, at any angle of the drop of sound wave, the coincidence of the waves can only occur on one plate. The walls of such enclosures can be made of various materials of different mass weights. The thickness of the air gap can reach up to 100-120 mm and the wall thickness is 80-150 mm.

Tensile and crushing forces affect the swinging wall. If the wall is massive, the stretching and crushing areas are far apart. When the wall is light, these areas are close to each other and less energy is emitted.

Dual waves of atifvaros air emit sound waves at all possible angles, causing resonant phenomena. The resonant frequency is less, the larger the wall mass per unit area, the greater the air gap thickness and the lower the stiffness of the insulation layer. It is best to keep this frequency as low as possible, since then the growth of the isolation begins with the lower frequencies.

If there is no rigid connection between the two walls, the sound insulation of the double enclosure air will increase when the resonances of the air gap fluctuate with mineral wool. In the wide frequency range, additional insulation will be reduced when the air gap is filled with mineral or glass wool. When the air gap is filled and its thickness increases twice, the insulation is only increased by about 4 dB. The heavier the walls are, the less insulation effect is given by filling the air gap with mineral wool. However, this double barrier makes it difficult to achieve high air sound insulation.

The practice of double cladding with an air gap between walls has long been used. Theoretically, the double partition with elastic bandages between the walls was examined by V. Zaborov, showing the influence of wall masses and their critical frequencies, their fluctuation frequencies 3

LT 5308 B for sound insulation. He studied the peculiarities of sound propagation in the resilient material of the filled air gap [B. I. Zaborov. Theory zvukoizoliacii ograždajuščix konstrukcii. Moscow, Stroiizdat 1969]

Diffusion of sound waves in a double-barrier air when it is not filled and when filled with mineral wool by presenting the measurement results to Mr Kreitan. It proves that, once the air gap is filled with sound-absorbing material, its insulation increases, but to a limited extent. The increase in insulation is determined not by the air gap material and its width, but by the mass per unit area of the wall. [V. G. Kreitan. Zaščita ot vnutrennix šumov v žilyx domax. Moscow, Stroiizdat 1990.]

The dependence of the double resonance frequency on the wall mass and the dependence of the insulation on the air gap filling contour was analyzed by K. Gosele et al. Gosele, W. Schule, H. Kunzel. Schall. Warme. Feuchte. Grundlagen, neue Erkenntnisse, Berlin, 2001]

The dependence of the double-partition resonance frequency on the wall masses, the air gap stiffness, the variation of the air sound insulation depending on the wall thickness and the total or partial air gap filling was investigated by W. Fasold and E. Vēce. [W. Fasold und E. Necklaces. Schallschutz und Raumakustik in de Prachis. Planungsbeispiele und konstructive Losungen. Huss-Medien GmbH. Verlag Bauwessen 10400 Berlin, 1999]

The double partition from massive walls, filled with an air gap by an absorbent material, was investigated by Mr Harris. [C. M. Harris. Noise control in buildings. Apractical Guide for Architects and Engineers. McGraw-Hill, Ine, New York, 1994]

Summarizing the data from the world's most famous scientists, we can see that in all cases the same design and acoustic scheme is used: double walls of different thicknesses and masses, an air gap that is always completely or not completely filled with sound-absorbing material. In order to increase the insulation of such a partition, the wall thickness, its mass per unit area or the thickness of the air gap and mineral wool should be increased. However, in this case, the total thickness of the double barrier, its mass, increases, which is highly undesirable in the construction practice. 4

LT 5308 B

The double partition, the air gap of which is filled with mineral wool with an additional lightweight plate and which, together with a part of the mineral wool, is attached to one of the walls, was examined by V. Stauskis. [V. J. Stauskis. Double soundproof enclosure. Patent application no. 2005 021. Date of filing of application: 01/03/2005].

The triple partition, the air gap of which is filled with the addition of two additional panels, including the retaining element and the layer of insulating material, which stand apart from the air and are not fixed to one of the walls of the massive partition, was examined by V. Stauskis. [V. J. Stauskis. Triple Sound Isolation Enclosure. Patent application no. 2005 025. Application date 16/03/2005]. 3 The essence of the invention

Without increasing the total thickness of the double partition, its air sound insulation can be increased between the walls filled with insulating material by inserting an additional one or more thin panels with a supporting frame and insulating material and leaving an air gap between them and the walls of the adjacent partition.

FIG. 1 shows a double lining with variable sound insulation consisting of two walls (1) of thickness δι and δ2, mineral wool (2) with a thickness δ2, one or more slabs (3) each thickness δ3, mineral wool (4) with a thickness δ4, a frame (5) and an air gap (6) with a thickness δ6. As long as there is no plate (3) in the air, mineral wool performs only sound absorption functions. It absorbs sound waves that propagate in the air layer in all directions while eliminating possible resonances. As a result, the insulation of the entire enclosure increases, but not much. When we add a plate to the filled air and attach it to the supporting frame with the mineral wool and leave an air gap between it and the wall of the adjacent partition, it forms an additional sound-insulating structure that gives an additional increase in sound insulation throughout the frequency range, but without increasing the noise. the total thickness of the double partition. The thin panel has a high critical frequency. Below its plate, the sound will emit less. A sound field is formed close to a thin panel, where the redistribution of sound energy from the environmental part of the environment takes place periodically.

EN 5308 B one-sided swinging plate, part of the environment adjacent to the other half-wave and vice versa. The sound energy emitted by the plate is not moved away, but is "bonded" to the plate in the form of a kinetic energy having a certain mass of air volume bound to the plate. When an air gap is left between the supporting frame and the mineral wool and adjacent wall of the enclosure, a rigid connection between the acoustic bridge (5) and the wall (2) is avoided. This will result in an additional increase in sound insulation across the frequency range.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION The double lining with a variable sound insulation consisting of two different thicknesses and walls of material, an air gap filled with a sound-insulating material or a filler, is characterized in that an additional one or more additional insulating material is provided between the walls. thin plates with a supporting frame and insulating material, and an air gap between them and the walls of the adjacent partition.