KR20160103658A - Damping Composition, Sheet and Block for Reducing Vibration - Google Patents
Damping Composition, Sheet and Block for Reducing Vibration Download PDFInfo
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- KR20160103658A KR20160103658A KR1020150026248A KR20150026248A KR20160103658A KR 20160103658 A KR20160103658 A KR 20160103658A KR 1020150026248 A KR1020150026248 A KR 1020150026248A KR 20150026248 A KR20150026248 A KR 20150026248A KR 20160103658 A KR20160103658 A KR 20160103658A
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K7/22—Expanded, porous or hollow particles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
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Abstract
A vibration attenuating composition excellent in attenuation of impact vibration caused by a floor impact source of a floor structure, a vibration attenuation sheet including the same, and a vibration damping block are disclosed. The present invention provides a viscoelastic composition for vibration damping comprising 10 to 20 parts by weight of water, 10 to 30 parts by weight of a binder, 20 to 40 parts by weight of a first inorganic pigment, and 10 to 25 parts by weight of a second inorganic pigment. The vibration attenuating sheet composed of the viscoelastic composition for vibration damping of the present invention has a low viscosity, a high storage modulus and a high loss coefficient, so that the vibration damping effect is excellent. When the vibration damping block is used in apartment houses such as apartments, .
Description
The present invention relates to a vibration attenuating composition having a heat insulating property and a vibration attenuating characteristic, a vibration attenuating sheet and a vibration attenuating block including the same, and more particularly to a vibration attenuating sheet having a vibration attenuating block A vibration damping sheet comprising the same, and a vibration damping block.
In general houses, apartments, and commercial or commercial buildings, people are living or doing various activities. Therefore, their interior materials have been improved and developed so as to satisfy the conditions that enable people to live comfortably and comfortably .
As a typical residential type, the insulation problem is generally satisfactory in the apartment house to satisfy the interlayer noise isolation and insulation, but the interlayer noise problem is still a serious social problem.
Noise problems must be solved for modern people who live in apartment houses and need an independent and comfortable environment.
In the conventional method for preventing such interlayer noise, a lightweight foamed concrete is placed on the upper part of the slab to form a buffer material layer on the upper part of the slab of foamed synthetic rubber or polyethylene foam, After forming a foamed concrete layer, a method of applying a finish mortar in which a hot water pipe is inserted on the lightweight foamed concrete layer has been used.
However, in the conventional method of installing the cushioning material and blocking the interlayer noise by installing the lightweight foamed concrete, there is a limit in blocking the low frequency band (63 Hz, 125 Hz) of the noise caused by the noise caused by the children, The disagreement between the parties is continuously occurring.
In the Ministry of Construction and Transportation, there is a legal minimum standard for the performance of heavy-weight impact soundproofing [(light noise falls below 58dB) and heavy impact sound (children's beep sound is below 50dB)]. The Housing Performance Classification System (Housing Act, Article 21-2), which is implemented from January, provides the buyer who wants to sell the housing information about the performance such as the weight impact at the time of announcement of the resident, giving the opportunity to choose housing according to the preference. And to construct a house with the performance level shown at the same time, the system is being legislated to display the performance in five areas including the sound environment with the aim of securing a comfortable living environment. Particularly, although the floor impact sound blocking performance (light impact sound and heavy impact sound) is treated as a major feature as the main performance indication item defined as the sound environmental performance item in the above system, A lightweight impact sound of 58 dB or less and a heavy impact sound of 50 dB or less can not be satisfied.
For example, with a floored bottom structure using materials such as foamed synthetic rubber, lightweight foamed concrete, and polyurethane foam, there is a limitation in blocking noise of a low frequency band to light impact sound of less than 58 dB and heavy impact sound of less than 50 dB.
Accordingly, it is a first object of the present invention to provide a vibration dampening composition that provides heat insulation and vibration damping properties.
A second object of the present invention is to provide a vibration damping sheet composed of the vibration damping composition.
A third object of the present invention is also to provide a vibration damping block including the vibration damping sheet.
In order to achieve the first object of the present invention, in an embodiment of the present invention, 10 to 20 parts by weight of water, 10 to 30 parts by weight of a binder, 20 to 40 parts by weight of a first inorganic pigment, And 10 to 25 parts by weight of a pigment.
In order to attain the second object of the present invention, in an embodiment of the present invention, the plate-shaped vibration attenuating sheet formed of a plate having a predetermined thickness has 10 to 20 parts by weight of water, 10 to 30 parts by weight of a binder, , 20 to 40 parts by weight of a first inorganic pigment, and 10 to 25 parts by weight of a second inorganic pigment, based on the total weight of the viscoelastic composition for vibration attenuation.
In order to achieve the third object of the present invention, there is provided a vibration damping block manufactured by attaching the vibration damping sheet described above to the surface of a lightweight foamed concrete block or an ALC block.
The vibration attenuating sheet composed of the viscoelastic composition for vibration damping of the present invention is excellent in vibration damping effect because of low viscosity, high storage modulus and loss coefficient.
Further, the vibration damping block according to the present invention can reduce the occurrence of the interlayer noise when used in apartment houses or the like.
FIG. 1A is a conventional analysis model for preventing interstice noise. FIG.
FIG. 1B is an analysis model of the vibration damping structure of the present invention. FIG.
2A and 2B are sectional views of a conventional interlayer noise preventing structure.
3 is an exploded perspective view of a vibration damping block according to the present invention.
4 is a perspective view of a vibration damping block according to the present invention.
5 is an exploded perspective view of another embodiment of the vibration damping block of the present invention.
6 is an exploded perspective view of still another embodiment of a vibration damping block according to the present invention.
7 is a cross-sectional view of a structure according to a first embodiment of an interlayer noise preventing structure using a vibration damping block according to the present invention.
8 is a cross-sectional view of a structure according to a second embodiment of an interlayer noise preventing structure using a vibration damping block according to the present invention.
9 is a cross-sectional view of a structure according to a third embodiment of an interlayer noise preventing structure using a vibration damping block according to the present invention.
10 is a structural cross-sectional view showing still another embodiment of the interlayer noise preventing structure using the vibration damping block according to the present invention.
11 is a structural cross-sectional view showing still another embodiment of the interlayer noise preventing structure using the vibration damping block of the present invention.
12A, 12B and 12C are modified embodiments of the lightweight foamed concrete of the vibration damping block according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
It is important that the viscoelastic composition for vibration damping which reduces the vibration caused by the floor impact source has the vibration damping property for reducing the radiation noise generated by the vibration caused by the impact in the apartment house. This property is closely related to the storage modulus and the loss factor of the viscoelastic composition for vibration damping.
The storage modulus, the loss modulus and the deformation modulus of the sample are measured using a function of temperature, time, and a period of giving a variable load (Hz) The mechanical behavior of the sample is measured by controlling the temperature with time and load changes through DMA (dynamic mechanical analysis, DIN 53513, DIN 53440, ASTM D 4065, ASTM D 4092).
When a certain period of force is applied to a specimen, a stress is generated in the specimen to cause deformation according to the stress. The mechanical elasticity is determined by the stress and deformation.
That is, a phase difference is generated according to a periodically changing stress (usually sinusoidal stress) due to a time delay due to the viscoelastic property of the material. This causes a phase shift between the applied stress and expansion. The dynamic modulus measured in consideration of this phase difference is G '(storage modulus) and G' (loss modulus) ).
Here, G 'is a direct result of the DMA measurement, which is the reaction of the sample with the cyclic stress and corresponds to the reversible elasticity of the sample. And the imaginary physical property "G" is the loss elastic modulus, which is a phase shift reaction up to 90 ° and corresponds to the mechanical energy that is irreversibly lost due to the conversion into heat. The tan δ (tangent delta) Is a loss factor and is used to measure the amplitude damping behavior of a material.
The vibration characteristics of the floor structure in the apartment house have the characteristic of causing the resonance to be caused by the use of the cushioning material using the floating floor. Since the shear deformation of each layer causing the resonance is reduced, the low frequency (63 Hz, 125 Hz) A great effect can be expected in the reduction of the noise source such as the heavy impact sound representing the large noise characteristic.
That is, when the vibration damping composition having a high loss coefficient, a small change in physical properties with respect to temperature, and a high durability is applied to a floor structure of a building, a great effect can be expected in preventing interlayer noise.
The vibration damping sheet composed of the viscoelastic composition for vibration damping according to the present invention has a loss factor of 1.2 to 2.0 and a loss factor of 2 or more as compared with the loss coefficient of rubber (0.1 to 1) 0.06) and wood (0.005 ~ 0.01), vibration damping material of the present invention has excellent damping performance in terms of noise reduction through vibration reduction.
In particular, the large energy and wavelength at low frequencies (63 Hz, 125 Hz) exhibit unpleasant and loud noise characteristics. The vibration attenuating sheet according to the present invention exhibits characteristics for reducing impact noise at low frequencies, Since it has vibration damping characteristics and durability even in change of physical properties, excellent noise reduction effect can be expected even in the long term.
However, the storage modulus, the loss factor, and the maintenance and durability of the viscoelastic composition for vibration damping are largely influenced by the respective composition components and composition ratios, The selection of the composition and the composition ratio of the vibration damping material should be prioritized.
The selection of such components and composition ratio has a great influence on not only vibration damping characteristics but also shape production and workability as a product.
Specifically, the viscoelastic composition for vibration damping according to the present invention comprises 10 to 20 parts by weight of water, 10 to 30 parts by weight of a binder, 20 to 40 parts by weight of a first inorganic pigment, and 10 to 25 parts by weight of a second inorganic pigment. Hereinafter, each component will be described in detail.
First, the viscoelastic composition for vibration damping according to an embodiment of the present invention includes 10 to 20 parts by weight of water.
And 10 to 30 parts by weight of an organic or inorganic binder. As the binder, a polymer synthesis emulsion selected from the group consisting of an acrylic polymer, a silicone polymer, a urethane polymer, and an acrylic-silicone copolymer polymer may be used. If the content of the binder is less than the above range, the vibration damping property is deteriorated. On the other hand, if the above range is exceeded, uniform mixing is difficult in the mixing process for preparing the composition, The workability due to an increase in consumption is deteriorated.
The viscoelastic composition for vibration damping according to an embodiment of the present invention includes 20 to 40 parts by weight of the first inorganic pigment. Wherein the first inorganic pigment comprises 15 to 25 parts by weight of a porous particulate material, 20 to 30 parts by weight of soda feldspar, 20 to 30 parts by weight of refractory clay, 15 to 25 parts by weight of tourmaline, 5 to 15 parts by weight of tourmaline, To 15 parts by weight.
First, the first inorganic pigment may be at least one selected from the group consisting of diatomaceous earth, clay, loess, tea clay, alopen, peat, silicon dioxide, calcium oxide, calcium hydroxide, calcium carbonate, char, activated carbon, bentonite, vermiculite, sepiolite, zeolite, And 15 to 25 parts by weight of a porous particulate material selected from the group consisting of cement.
The porous particles are prepared by processing the above components into fine particles to increase the surface area of the porous particles.
The diatomaceous earth is a main constituent of natural mineral clay, and is composed of porous fine particles, and has excellent function of reducing formaldehyde which is a cause of sick house syndrome. Especially, in Japan, it has been certified as a building material that reduces pollution caused by Volatile Organic Compounds (VOCs) in indoor air.
The clay, loess, and tea clay are porous fine particles, which are natural minerals having excellent humidity control. The above-mentioned sepiolite and zeolite have been found to be superior to simple diatomaceous earth walls and other products as a result of the research institute's experiments.
Allopen is a major component of natural mineral clay of volcanic ash, and it is known that it has the advantage of being excellent in the function of reducing formaldehyde, which is a cause of sick house syndrome, composed of porous fine particles.
And allopen is porous fine particles, which is made of volcanic ash, which has excellent humidity control function, and is known to have absorption and desorptive ability of 4 to 5 times of diatomaceous earth and 15 times of humidity wall paper. Alopen also absorbs moisture when the humidity is high in the room and lowers the humidity when the humidity is low. Therefore, it is possible to maintain the optimum humidity (50% to 60%) of the living space, to prevent the allergy and the atopic disease by suppressing the propagation of the germs. On the other hand, the results of experiments conducted by Korean research institutes have shown that they have an effect on alkaline odors such as ammonia and trimethylamine, which are major components of odor, and acid odor components such as hydrogen sulfide and methylmercaptan. Odor removal and mitigation effects have been demonstrated to be superior to diatomite walls and other products.
Calcium carbonate, calcium carbonate, charcoal, activated carbon, bentonite, vermiculite, pozzolan, and the like can be mixed with an organic binder or an inorganic binder.
Due to its hydration, microcement constitutes hard strength by mixing with water and can be formed into various shapes by hydration. Micro cement is a particulate cement which is developed to be suitable for inorganic ground fillers and various repair or reinforcement materials. It is widely used as ground filler and repair reinforcing material, which require uniform grain size as well as roughness, high strength and high durability, .
Since the microcement is a fine powder, the microcement is rapidly activated and its early strength is excellent. Since a compact matrix is formed, the microcement has an excellent strength development rate, a good particle size and a small maximum particle size, And has excellent durability.
When the porous particulate material is used in an amount less than 15 parts by weight, the specific functional content per unit area of the coating film is lowered, so that the weather resistance, which is the physical property of the first inorganic pigment, is lowered and the function of reducing the vibration of the structure is lowered. On the other hand, when the amount of the component is more than 25 parts by weight, durability of the vibration attenuating sheet deteriorates.
And the first inorganic pigment comprises 20 to 30 parts by weight of soda feldspar. If it is used in an amount less than 20 parts by weight of the total weight of the soda feldspar, the stain resistance and the adhesion strength are lowered. If the amount is more than 30 parts by weight, the stain resistance is poor.
The first inorganic pigment includes 20 to 30 parts by weight of refractory clay. This is a clay having a refractory component for improving the flame retardant performance unlike the above-mentioned car clay. When the refractory clay is used in an amount of less than 20 parts by weight, the fire resistance is deteriorated. When the refractory clay is used in an amount exceeding 30 parts by weight, stain resistance is deteriorated.
Also, the first inorganic pigment has 15 to 25 parts by weight of stearic acid. The stalactite acts to form a vibration attenuating sheet composed of the composition to form a certain thickness. When the amount of the stover used is less than 15 parts by weight, the optimum thickness of the vibration attenuating sheet can not be exhibited. When the amount of the stunning is more than 25 parts by weight, durability of the vibration attenuating sheet is low.
The first inorganic pigment comprises 5 to 15 parts by weight of tourmaline and 5 to 15 parts by weight of talc. When the amounts of the tourmaline and the black talc are less than 5 parts by weight, the damping performance of the vibration attenuating sheet deteriorates. If the amount is more than 15 parts by weight, the stain resistance of the vibration attenuating sheet deteriorates.
Also, the viscoelastic composition for vibration damping according to an embodiment of the present invention includes 10 to 25 parts by weight of the second inorganic pigment. The second inorganic pigment includes a porous particulate and refractory clay.
Specifically, the porous particles may be selected from the group consisting of diatomaceous earth, clay, loess, tea clay, alopen, peat, silicon dioxide, calcium oxide, calcium hydroxide, calcium carbonate, char, activated carbon, bentonite, vermiculite, sepiolite, zeolite, And macrocement, and 70 to 80 parts by weight are used.
When the amount of the porous polymeric material used is less than 70 parts by weight, the vibration damping characteristic of the present invention is deteriorated. When the amount is more than 80 parts by weight, the shrinkage force of the vibration attenuating sheet is increased.
And the second inorganic pigment of the present invention comprises 20 to 30 parts by weight of refractory clay. When the amount of the refractory clay is less than 20 parts by weight, the refractory performance is deteriorated. When the amount is more than 30 parts by weight, the stain resistance is lowered.
Hereinafter, a vibration attenuating sheet which can be directly used for a structure using the viscoelastic composition for vibration damping according to the present invention will be described.
Preferably, the vibration damping sheet for vibration attenuating vibration damping sheet of the present invention is formed into a plate with a thickness of 1 to 20 mm.
Examples of the method of forming the sheet according to the present invention using the above-mentioned viscoelastic composition for vibration damping include a method of extruding a viscoelastic composition for vibration damping into an extrusion molding machine and extruding the composition to a predetermined thickness using a T-die, The viscoelastic composition for vibration damping according to the present invention is inserted between the both rollers disposed in the upper and lower portions and pressed and molded, or a method in which a viscoelastic composition for vibration damping is put in an extrusion molding machine, extruded through a tie die, However, it is needless to say that the plate-like shape of the viscoelastic composition for vibration damping of the present invention, that is, the sheet can be formed by any of the above methods.
Next, the vibration attenuating sheet formed by using the viscoelastic composition for vibration damping according to the present invention is molded into a thickness of 1 to 20 mm depending on the application, and the length and width of the sheet are not particularly limited Do not.
The vibration attenuation sheet manufactured as described above is cut into various shapes such as a cube of a certain size, a rectangular parallelepiped, a triangular-shaped body, a rectangular-shaped body, an octagonal-shaped body, and attached to the surface of a lightweight foamed concrete block or an AOC (Autoclaved Lightweight Concrete) block A vibration damping block is manufactured. At this time, the ALC block is a kind of lightweight foamed concrete block manufactured in the factory and vapor-cured, and is included in the lightweight foamed concrete block.
The length of the lightweight foamed concrete block or the thickness of the ACE block is preferably 300 to 600 mm, and most preferably 20 to 60 mm in terms of vibration damping effect and workability, but is particularly limited thereto But it can be formed into various shapes such as a hexagonal hexagonal body, a straight hexagonal body, a triangular body, a rectangular body, a hexagonal body, and an octagonal body. In addition, a lightweight foamed concrete block or an AA-block may be formed to have a hollow layer when the shape of the block is formed (see FIGS. 10, 12A and 12B).
It is needless to say that the lightweight foamed concrete block or the ALC (Autoclaved Lightweight Concrete) block may be formed using a heat-resistant material such as limestone (CaCO 3 ) or sludge.
The thickness of the vibration attenuation sheet cut on the surface of the vibration damping block is preferably from 1 to 20 mm to exhibit the effect of vibration damping, but the thickness of 3 mm is most preferable in view of the vibration damping effect and economy, The effect is rapidly deteriorated.
As shown in FIGS. 3 to 4, the vibration attenuation sheet attached to the surface of the vibration damping block of the present invention may be attached to two adjacent side surfaces of the lightweight foamed concrete block or the AC- The most practical and economical. That is, when a vibration attenuating sheet is laid on a block attached to two neighboring sides, a vibration attenuating sheet is interposed between the block and the block, so that the vibration attenuating effect is similar to the vibration attenuating effect of the block attached to the four sides of the vibration attenuating sheet. Respectively. Nevertheless, it can be used on 2-4 sides of the lightweight foamed concrete block of the present invention (see FIG. 5), and further attached to the 2-4 side and bottom of the lightweight foamed concrete block 6). Although not shown, the vibration damping block for viscoelastic vibration may be manufactured by attaching the lightweight foamed concrete block on the 2-4 side surface and the bottom surface of the lightweight foamed concrete block in advance, that is, the entire surface of the lightweight foamed concrete block.
The model concept of the interlayer noise prevention structure consisting of the buffer layer and the lightweight foamed concrete layer of the floored floor structure of the proposed apartment house proposed in Germany has used the floating floor structure because of the problem of the light weight impact sound in the apartment house in Germany, This effectively controlled the noise for light impact sound.
However, according to the floating floor structure proposed in Germany, that is, the structure in which the finishing mortar layer and the floor concrete slab layer are separated by the buffer material layer and the lightweight foamed concrete layer, the impact force applied to the floor is lowered to a specific frequency And therefore this was a system that could provide enough satisfactory control to prevent this kind of noise because the radiated noise was of particular interest only above 250 Hz.
However, unlike in Germany, most of the houses in Korea are constructed with the Ondol and the wall structure. Therefore, the impact force transmitted from the impact source to the finishing mortar layer is transmitted to the lightweight foamed concrete layer and the buffer layer do.
FIG. 1A is a detailed model of the vibration transmission and reduction principle of a so-called floating floor structure composed of a lightweight foamed concrete layer and a cushioning material layer, which are used as a reduction method for reducing floor impact noise of a conventional apartment building.
In this model, the floor impact sound appears as the vibration of the upper slab caused by the impact source is transmitted through the structure and radiated to the lower layer. In order to reduce the floor impact noise, the vibration of the structure should be reduced. For this purpose, the mass (m), stiffness (K) and damping should be controlled. That is, the following equation (1) must be satisfied.
Generally, the bottom is the bending wave because the acoustic radiation is generated by the bending vibration. Therefore, the most important wave in the solid transmission sound is the bending wave. These bending waves are relatively large in transverse displacement than longitudinal and transverse waves and a significant portion of the energy is transmitted by the bending waves. And it causes mutual interference with the adjacent medium and causes the structural element to deform and propagate perpendicularly to the energy traveling direction. Therefore, the bending wave plays an important role in acoustic radiation because it is the main transfer medium of energy and energy interchange with multiple media such as air conduction sound.
The above bending wave can be expressed as the following equation when assuming that the floor slab of the wall structure is a flat plate. It is assumed that the displacement ω (x, y, z) of the plate occurs in the z direction perpendicular to the xy plane and the displacement is very small compared to the thickness h of the plate. Therefore, it can be assumed that the neutral plane passing through the center of the plate is not deformed during bending. Also, assuming that the normal stress acting in the transverse direction of the plate is ignored, the equation of free vibration of this plate is expressed by the following equations (2) and (3).
Where D E is the bending stiffness of the plate, ∇ 4 is the half-tone operator, and ρ is the mass density.
Where E is the modulus of elasticity, v is Poisson's ratio, and h is the thickness of the flat plate.
The biharmonic operator is a quaternary differential doubler, and in the case of a rectangular coordinate system, it is expressed by the following equation (4).
When the boundary condition of the plate is a clamped edge, both the displacement and the vertical strain at the edge are zero. That is, the simple supporting boundary condition of the rectangular plate is expressed by the following equations (5) to (7). Equation 5 represents the boundary condition at the boundary x = 0, x = l 2 at all boundaries, Equation 6 represents the boundary x = 0, x = l 1 ,
From the above equation, it can be seen that the displacement of the plate in the homogeneous plate is controlled according to the elastic modulus and the thickness of the slab. Therefore, a method of increasing the thickness of floors or slabs using materials having physical properties of elasticity has been proposed and used.
However, when the impact force acts on the upper layer in the wall structure, the bottom structure vibrates, which behaves in various forms to generate refracting waves. These reflections are transmitted to the solids which constitute the space of the lower part, which is radiated to the air to hear the sound of air transmission. Since the solid sound transmits the solid to the medium, when the impact is applied to the upper layer, Impact force is transmitted, which is transmitted to the lower layer wall and the floor by vibration, and is generated by generating refraction waves.
At this time, the limit of not isolating the solid sound emitted below 125Hz, which is the main area of the heavy impact sound, appears and the noise becomes larger. This is because the conventional material such as a cushioning material is an elastic body and the wall structure is elastically deformed, so attenuation by the cushioning material can not exert its performance at a low frequency.
Also, increasing the thickness of the slab increases the stiffness of the slab as well as the weight of the structure. Therefore, noise reduction effect can not be expected due to the shift of the resonant frequency.
In the present invention, a block type vibration damping system capable of being described with reference to FIG.
First, the experimental data on the viscoelastic material is subjected to curve fitting as a function of frequency to obtain the physical properties according to the frequency of the viscoelastic material as a function expressed by the following equation (8).
The real part of the equation represents the storage modulus and the imaginary part represents the loss modulus.
In order to reflect the frequency dependency of the RKU equation, an error function such as the following equation (9) is selected.
The fact that the frequency dependence is reflected in the RKU equation means that the natural frequency obtained by applying the physical property at a specific frequency of the viscoelastic material becomes equal to the frequency of the viscoelastic material. That is, if the above error function becomes 0, the frequency of the viscoelastic material becomes equal to the natural frequency, and the frequency dependency is reflected. Therefore, reflecting the frequency dependence in the RKU equation is a problem of obtaining the root of the error function 0 through the Iteration method.
In the present invention, the Newton-Raphson method was selected among various Iteration methods. The Newton-Raphson method is as follows. If the initial assumption for a root is x i then we can find a tangent to the point [x i , f (x i )] and the point at which this tangent crosses the x axis is the improved root x i +1 . Geometrically, the slope at [x i , f (x i )] is given by the following
In order to solve the above-mentioned error function using this method, Iteration is performed using the following equation (12). That is, when the input value x i is substituted with the frequency, the output value x i + 1 can be obtained as shown in the following equation (13).
x is the input frequency of the viscoelastic material, or the natural frequency obtained in the RKU sandwich beam / plate equation, obtained by repeatedly calculating the error function until it converges to zero by inputting x i + 1 into the next iteration. The optimum thickness of the damping material was obtained by using the physical properties of this frequency.
Also, since the bottom slab is blocked and the viscoelastic material is formed between the block and the block, the primary impact force transferred from the finishing mortar layer (the ondol structure) to the slab is reduced, and the repeated wave vibration is reduced or controlled to reduce the refractive wave size.
This is the principle that the impulsive force from the finishing mortar layer to the slab causes the individual blocks to vibrate.
In FIG. 1B, the vibration force transmitted to the bottom slab and the wall in the finishing mortar layer (the on-hole structure) described above and proceeding to the receiving room reduces the vibration force due to the load reduction of the on- When the vibration attenuating sheet is used after bonding the vibration attenuating sheet to obtain the vibration attenuating effect, the vibration attenuating sheet exhibits elastic deformation and viscous flow at the same time when a force is applied to the object from the impact source, Vibration insulation is applied to prevent horizontal movement, reducing vibration energy transmitted to wall structure.
When the impact force transmitted from the impact source to the finish mortar layer (ondoll structure) is transmitted to a specific vibration damping block among the blocks of the vibration damping block layer, the lightweight foamed concrete layer is fixed to the constant vibration damping block Sized block, and at the same time, the vibration attenuating sheet is attached to the 2-4 side of the lightweight foamed concrete block or the AC-cube block, and shear deformation is induced only in a specific vibration damping block subjected to an impact force So that shear deformation is not transmitted to other vibration damping blocks.
The above vibration damping block is not only reduced in vibration damping effect but can be shaped to have a hollow structure by a competitor (refer to FIG. 12A). In addition, the upper part of the block is provided with a heating pipe (See Figs. 10 and 12B and 12C).
In another embodiment of the vibration damping block according to the present invention, the viscoelastic vibration damping sheet is attached to the 2-4 side and bottom surface of the lightweight foamed concrete block or the ALE cube block so that shear deformation is not transmitted to the lower side.
In another embodiment of the vibration damping block according to the present invention, the vibration attenuating sheet is attached to the 2-4 side surfaces, the bottom surface and the upper surface of the lightweight foamed concrete block or the AC cube block so that the shear deformation is not transmitted to the upper and lower sides. In addition, by suppressing the vibration in the vibration attenuation sheet to control the resonance phenomenon, an excellent effect is obtained in preventing noise.
Since the vibration damping sheet of the present invention has a viscosity, the vibration damping sheet of the present invention adheres well to the lightweight foamed concrete block or the ALE cube block without attaching large force, and does not easily fall off.
The viscoelastic vibration attenuating sheet of the present invention may be used in place of conventional cushioning materials such as polyethylene foam and polyurethane foam for preventing interlayer noise, but the effect is remarkably less than that of the sheet of the present invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. It can be understood that it is possible.
Claims (5)
10 to 30 parts by weight of a binder;
20 to 40 parts by weight of the first inorganic pigment; And
And 10 to 25 parts by weight of a second inorganic pigment.
The plate-
10 to 20 parts by weight of water;
10 to 30 parts by weight of a binder;
20 to 40 parts by weight of the first inorganic pigment; And
And 10 to 25 parts by weight of a second inorganic pigment is composed of a viscoelastic composition for vibration damping.
At least one selected from the group consisting of diatomaceous earth, clay, loess, tea clay, alopen, peat, silicon dioxide, calcium oxide, calcium hydroxide, calcium carbonate, charcoal, activated carbon, bentonite, vermiculite, sepiolite, zeolite, pozzolan and macrocement 15 to 25 parts by weight of a porous particulate material;
20 to 30 parts by weight of feldspar;
20 to 30 parts by weight of refractory clay;
15 to 25 parts by weight of stones;
5 to 15 parts by weight of tourmaline; And
And 5 to 15 parts by weight of talc.
At least one selected from the group consisting of diatomaceous earth, clay, loess, tea clay, alopen, peat, silicon dioxide, calcium oxide, calcium hydroxide, calcium carbonate, charcoal, activated carbon, bentonite, vermiculite, sepiolite, zeolite, pozzolan and macrocement 70 to 80 parts by weight of a porous particulate material; And
And 20 to 30 parts by weight of refractory clay.
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| KR1020150026248A KR20160103658A (en) | 2015-02-25 | 2015-02-25 | Damping Composition, Sheet and Block for Reducing Vibration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180131785A (en) | 2017-06-01 | 2018-12-11 | (주)친환경건축디자인시공연구센터 | The structure for reducing noise transfer between floors |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100506986B1 (en) | 2003-05-13 | 2005-08-09 | 김우상 | A composition for noise prevention |
| KR100750890B1 (en) | 2007-01-25 | 2007-08-22 | 전용태 | Impact sound insulating material and floors structure of an apartment house using the same |
| KR100839203B1 (en) | 2007-06-26 | 2008-06-17 | 김진만 | Sheet and block for reducing vibration using viscoelastic composition |
| KR101323476B1 (en) | 2013-06-12 | 2013-10-31 | 조선미 | Noise protection material for building and structure for noise reduction of between floors and thereof construction method |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100506986B1 (en) | 2003-05-13 | 2005-08-09 | 김우상 | A composition for noise prevention |
| KR100750890B1 (en) | 2007-01-25 | 2007-08-22 | 전용태 | Impact sound insulating material and floors structure of an apartment house using the same |
| KR100839203B1 (en) | 2007-06-26 | 2008-06-17 | 김진만 | Sheet and block for reducing vibration using viscoelastic composition |
| KR101323476B1 (en) | 2013-06-12 | 2013-10-31 | 조선미 | Noise protection material for building and structure for noise reduction of between floors and thereof construction method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180131785A (en) | 2017-06-01 | 2018-12-11 | (주)친환경건축디자인시공연구센터 | The structure for reducing noise transfer between floors |
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