KR20110049176A - Decreasing material of noise and vibration using luffa cylindrica roem - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise and vibration reducing material, and more particularly, to a noise and vibration reducing material comprising a natural loofah. According to the present invention, by using a natural scrubber as the material of the noise and vibration reducing material, it is possible to solve the pollution problem which is not harmful to the human body and occurs in the manufacturing process of the synthetic scrubber, and by absorbing and blocking the noise and vibration effectively, the apartment, There is an effect that can effectively reduce the noise between the floor, such as hotels, hospitals, car seats, sports facilities.

Description

Decreaseing Material of Noise and Vibration Using Luffa cylindrica Roem.

The present invention relates to a vibration and noise reduction material made of a natural scrubber which is harmless to a human body and is excellent in noise and vibration absorption effects.

The urban concentration, densification of the population, and the increase of traffic volume due to the urbanization of the social structure have caused a new obstacle to the living environment called noise pollution. In particular, urban noise, unlike other pollution factors, has a significant impact on emotional life in addition to the long-term effects on the health of citizens, which is as important as other environmental pollution problems such as air pollution and water pollution.

Individuals cause noise fatigue or stress, even depression. In particular, the noise pollution between floors of apartments often becomes a serious problem among neighbors and becomes a social problem.

Multi-level housing such as apartments, villas and multi-family houses, sports facilities such as aerobics and bowling alleys, hospitals, hotels, condominiums, and officetels require an inter-floor noise suppression system. The building's interlayer noise includes the sound transmitted through the air, such as the sound of running, walking, falling of objects, hammers, water supply pipes, toilet drains, etc. There is noise. Solid transmission noise, which is the main target of sound insulation system, is divided into high-end light weight impact sound and low-range weight shock sound. In Korea, where a sedentary lifestyle is used, heavy impact sound as well as light weight impact sound are the main causes of noise pollution.

In the case of multi-unit buildings such as apartments or multi-storey buildings, most of the airborne sound is blocked by the concrete slab structure.However, when a shock or vibration is applied directly to the floor by human walking or falling objects, It is variable and hardly attenuated and radiates through floor slabs, ceilings or walls into lower floors or into adjacent generations. These "bottom shocks" are light impact sounds that generate a lot of high frequency components, such as falling sounds of bowls or objects, and heavy impact sounds that generate a lot of low frequency components such as adult walking or children's skipping. It is rough. In the case of Gumi houses, heavy impact sound is generally the main, but in Asian cultures such as Korea, both heavy shock and light impact sound are generated, and the floor impact sound reduction material of the building is required to prevent its propagation.

Most Korean multi-family houses have a wall structure consisting of a single building structure with walls and floors connected to each other. Since the concrete structure is rigid and closed due to the characteristics of the material, the concrete structure has sufficient blocking performance against the air transmission sound that is delivered to the medium such as speech or TV sound. However, in the case of a solid transmission sound generated when an impact is applied to the concrete surface, the concrete has a characteristic that the vibration damping ability of the concrete is very small, so that it is easily transmitted to an adjacent generation.

Until now, the means for reducing noise due to the impact of floor impact have been applied to the floor slab by constructing lightweight foamed concrete to a predetermined thickness or using foamed polystyrene, but this is for heating or insulation rather than noise reduction. It was not effective in reducing the impact sound.

Recently, a method of applying a shock-absorbing buffer material to reduce the floor impact sound has been used. Such a buffer material is glass wool, rock wool, waste tire chip, fiber, PE foam sponge, and the like.

However, in the case of glass wool and rock wool, it can cause fatal obstacles to the human body due to harmful dust during cutting, transportation, and construction, as well as problems with structural stability due to local instantaneous load and settlement by long-term load. can do. In addition, there is a problem in that the lightweight concrete, which is constructed in the wet construction method of the domestic construction method is infiltrated between the glass wool or rock wool to exhibit a noise reduction effect.

Waste tire crushing chips are used as shock absorbers in terms of recycling waste resources, but they do not show satisfactory impact sound reduction performance.The use of binders to connect the chips results in the dynamics of solvent volatilization and load. There is a problem such as the occurrence of cracks in the mortar layer due to lack of stability, instability of curing due to light concrete penetration during light concrete pouring.

In addition, as a countermeasure for reducing the floor impact sound, there is a plan to increase the slab rigidity of the building, which is not realistic due to the thickening of the slab, the height of the floor, and the increase of the load of the building.

Floor concrete composition for thermal insulation and sound insulation using waste tire pulverization is also useful in terms of the utilization of waste resources, but the actual sound insulation performance is very poor and is not suitable for use as a noise reduction material for its original purpose. The impact sound reducing materials used in the buildings of multi-unit houses so far have not been able to achieve the satisfactory floor impact sound reduction performance, which is approached in terms of recycling of waste resources. There is no product that satisfies.

The present invention is a noise and vibration reducing material, which is not harmful to the human body, does not cause pollution problems, and effectively absorbs noise and vibration, thereby preventing floor noise of apartments, hotels, hospitals, etc., floors of automobile seats, sports facilities, shoes, etc. The purpose is to provide a noise and vibration reducing material that can effectively reduce vibration.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise and vibration reducing material, and more particularly, to a noise and vibration reducing material comprising a natural loofah.

First of all, I want to define the term related to noise in order to avoid confusion of concepts. In general, "noise" refers primarily to airwaves radiated from the noise source through the air, and "absorption" refers to absorption of airwaves or vibration from the noise source so that echoes are not generated in the interior space. , "Soundproof" means to prevent noise from leaking into the outside space, "sound insulation" means blocking the vibration of sound in the middle, "building floor impact sound" and "building interlayer impact sound" means almost the same Used as

In the present invention, the natural loofah refers to a portion of dry sponge tissue in the fruit of Luffa cylindrica Roem. The scrubber cucumber is sponge-gourd in English, and as the name of English implies, natural scrubber has a sponge-like property, which is due to the net-like fibers of the natural scrubber. The origin of the loofahmioi is known as tropical Asia and is an annual plant. This scrubber cucumber is cultivated in Korea, China, Japan, etc., and the natural scrubber of this invention is not limited to what was obtained from the scrubber cucumber fruit of a specific mountain area.

In the present invention, the natural scrubber is attached to the wall or the bottom surface in the form of a sheet can be used as a noise and vibration reducing material. For example, it can be used as a noise and vibration reducing material for places where noise reduction between floors is required such as apartments, multi-family houses, hospitals, hotels, condos, aerobics, bulling sites, etc. The thickness of the sheet is not particularly limited, and may be appropriate thickness depending on the application environment, such as construction or installation purpose, location, but preferably the thickness may be 3 mm to 5 mm.

According to the present invention, by using a natural scrubber as the material of the noise and vibration reducing material, it is possible to solve the pollution problem which is not harmful to the human body and occurs in the manufacturing process of the synthetic scrubber, and by absorbing and blocking the noise and vibration effectively, the apartment, There is an effect that can effectively reduce the noise between the floor of the hotel, hospital, etc. and the vibration of the car seat floor, sports facilities, shoes floor, etc.

Hereinafter, the present invention will be described in detail through examples. The following examples are only examples for describing the present invention, and the scope of the present invention is not limited thereto.

<Examples>

1. The noise of scrubber net fiber Reduction  Effect test

To measure the noise reduction effect of scrubber net fibers, place a noise generator in a rectangular box, spread the inner wall of the box with different materials, close the door of the box, and then measure the noise meter outside the box (RION-NA-27). The noise level was measured by).

First, in the first test, the noise value of the noise source was fixed, and the sound insulation effect was confirmed with various materials. In the second test, the noise reduction effect of various materials was measured by changing the noise value.

① primary noise Reduction  exam

The first test fills the inner wall of the box with wallpaper, cloth, styrofoam, scrubbers, air-conditioners, paper boxes, newspapers, trees, and fallen leaves, leaving the phone with the noise measurement fixed at 81.9 dB in the box. After closing the door, the phone in the box was dialed from the outside, and the noise level was measured by a noise meter from the outside of the box. The process was repeated three times, and the average value was obtained. The results are as shown in the following [Table 1].

Table 1 Primary noise reduction test results (cell phone noise value: 81.9 dB)

material Noise measurement value (dB) 1 time Episode 2 3rd time Average wallpaper 67.3 64.7 66.7 66.23 cloth 66.5 68.7 67.5 67.57 Styrofoam 70.5 71.0 70.9 70.80 Scrubbers 62.1 63.7 63.0 62.93 Air shock 63.1 65.0 64.8 64.30 Paper box 68.9 67.9 67.1 67.97 newspaper 62.4 62.6 61.6 62.20 tree 66.3 68.9 67.1 67.43 Deciduous 68.2 70.9 67.8 68.97 Tree + fallen leaves 69.1 67.5 69.7 68.77

According to the above [Table 1], as a result of testing the noise reduction effect on the material of various materials, the scrubber was 62.93 dB, the lowest average of the noise measurement value, it was confirmed that the noise reduction effect is superior to other materials. .

② Second noise reduction test

In the second noise reduction test, noise of various frequencies (84.6 dB, 70.2 dB, 67.9 dB, 62.1 dB, 55.8 dB) is generated, and for each noise, the noise measurement when the inner wall of the box is not made of any material Values (control) and noise measurements of the inner wall of the box with various materials were compared. The results are as shown in the following [Table 2], in Figure 1 is a graphical representation of the reduction ratio for each material shown in the following [Table 2].

[Table 2] Second noise reduction test results

Different noise (dB) Control
(empty) wallpaper cloth Porous vinyl Scrubbers 1 time 84.6 72.2 67.7 67.5 66.9 65.4 Episode 2 70.2 66.4 66.1 65.2 65.7 63.6 3rd time 67.9 64.7 62.4 62.0 61.4 60.8 4 times 62.1 59.0 57.3 57.6 55.3 54.3 5 times 55.8 53.1 50.5 49.2 47.7 46.2 Average Wrong formula Wrong formula Wrong formula Wrong formula Wrong formula Wrong formula    Reduction rate 1.0 0.93 0.89 0.89 0.87 0.85

As shown in [Table 2] and FIG. 2, when the noise of various frequencies was generated, the material having the best noise reduction rate compared to the control was found to be scrubber (0.85).

Therefore, when manufacturing a sheet for noise reduction using natural scrubber as a material, it is possible to produce a sheet having an excellent noise reduction effect.

2. Vibration of scrubber net fiber Reduction  Effect test

The flooring was laid on a 10 cm x 10 cm iron plate, and the steel beads were dropped freely in a 50 cm vertical air.

Next, after placing several materials under the same iron plate as above, freely dropping the iron ball in a 50 cm vertical air and the vibration degree was measured with a vibration measuring instrument. In this test, scrubber, sponge, styrofoam, newspaper, and wallpaper were used as test materials. Test results of the vibration reduction effect is as shown in the following [Table 3], Figure 2 is a graph showing the vibration reduction rate (low reduction ratio) for each material.

[Table 3] Vibration Reduction Effect for Various Materials

material sign Frequency (dB) Reduction ratio iron plate A 40.8 1,000 1 sheet of steel plate + scrubber B 33.9 0.831 Iron plate + Scrubber 2-ply C 31.9 0.782 Iron plate + sponge D 32.0 0.784 Iron plate + 1 styrofoam E 30.9 0.757 Iron plate + 2 styrofoam F 30.5 0.748 5-ply iron plate + newspaper G 38.6 0.946 10 sheets of iron plate + newspaper H 33.2 0.818 Iron plate + wallpaper I 34.0 0.833

According to the graph shown in [Table 3] and FIG. 2, it can be seen that the vibration reduction effect is highest when the styrofoam is laid. Next, the high vibration reduction effect was sponge, and the scrubber had almost the same vibration reduction rate as the 10-ply newspaper.

However, when the loofah was doubled, the reduction rate was 0.782, which was similar to 0.757 with one styrofoam. This is considered to be an error according to the thickness. In other words, even if the thickness of the styrofoam and the scrubber are the same, the styrofoam is already compressed at the time of manufacture so that the height is no longer reduced. When the vibration is dropped, the width of the space where the vibration is transmitted to the floor becomes narrower.

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. The scope of the present invention is shown by the claims to be described later rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be.

1 is a graph showing a reduction ratio value in order to compare noise reduction effects of various materials.

2 is a graph showing a reduction ratio value in order to compare vibration reduction effects of various materials.

Claims (3)

Vibration and noise reduction material characterized by consisting of a natural scrubber. The method of claim 1, Vibration and noise reduction material, characterized in that the natural loofah made of a sheet form. 3. The method of claim 2, The said sheet is 3 to 5 mm in thickness, The vibration and noise reduction material characterized by the above-mentioned.

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