KR100691518B1 - Ceiling mounting floor noise reduction device using cantilever multiple tuned mass damper - Google Patents

Abstract

The present invention relates to a floor-mounted floor-to-floor noise reduction device using a cantilever-type multi-tuned mass damper. An object of the present invention is to provide an attachable interlayer noise reduction device.

The ceiling-floor-type interlayer noise reduction device using the cantilever-type multi-tuned mass damper of the present invention having the above object is coupled to I-shaped steel or c-shaped steel attached to the bottom of the bottom plate, which is a structure installed below the bottom finish of the structure. It consists of a multi-tuning mass attenuator, characterized in that to absorb the vibration of the bottom plate to reduce the floor impact sound, the multi-tuned mass attenuator is left and right on the bottom plate so that the weight body having 1 to 2% of the bottom plate mass has rigidity and damping Characterized in that it consists of a cantilever-type tuned mass attenuator connected symmetrically.

Cantilever, Tuned Mass Attenuator, Multiple Tuned Mass Attenuator, Noise Attenuation, I-beam, C-beam

Description

Ceiling mounting floor noise reduction device using cantilever multiple tuned mass damper}             

1 is a schematic diagram showing a cantilever type tuned mass damper

Figure 2 is a schematic diagram showing a state in which the multi-tuned mass damper of the present invention is installed using I-shaped steel

Figure 3 is a schematic diagram showing a state in which the multi-tuned mass damper of the present invention is installed using the c-beam

<Explanation of symbols for the main parts of the drawings>

1: floor finishing material 3: bottom plate

5: I section steel 5a: Anchor bolt

7: ceiling surface 9: c-beam

10 structure 20 cantilever type synchronized mass damper

The present invention relates to a floor-floor type floor-to-floor noise reduction device using a cantilever-type multi-tuned mass damper, and more particularly, to a device for reducing floor noise in a multi-family house, the upper floor slab (hereinafter referred to as "floor plate"). It relates to a floor-mounted floor interlayer noise reduction device using a cantilever-type multi-tuning mass damper capable of absorbing the vibration of the multi-tuning mass damper to reduce the noise generated in the lower floor due to the vibration of the upper floor plate.

In conventional apartments, the floor noise reduction method inserts an interlayer noise cushioning material between the slab of the slab and the ondol finishing material, or installs a ceiling and a sound shield to block the transmission of the lower floor noise.

However, in the conventional method of blocking the noise to the lower floor by the installation of the interlayer noise absorber or the sound shield, there is a problem in that the installation cost of the components is increased, and the effect of reducing the lower floor of the noise generated from the upper floor is extremely insignificant. there was.

That is, the noise that is a problem in the apartment houses are light-shock shocks of high frequency bands, such as dropping objects, and heavy shock sounds of mid- and low-frequency bands such as children playing.

Among the above noises, the light impact sound may be blocked to some extent by the installation of a conventional interlayer noise buffer or a sound shield, but the heavy impact sound may be caused by vibration of the bottom plate. Could not see the blocking effect.

The present invention has been made to improve the above-described problems, by applying a tuning mass damper used in the vibration control of the structure to the vibration of the floor plate of the apartment house to absorb the vibration of the upper floor plate, thereby generating the noise of the upper floor itself It is an object of the present invention to provide a floor-floor type interlayer noise reduction device using cantilever-type multiple tuned mass dampers that can be reduced.

As a means for achieving the above object, the ceiling-floor-type interlayer noise reduction device using the cantilever-type multi-tuned mass damper of the present invention, I-shaped steel attached to the bottom of the bottom plate which is a structure installed under the floor finish of the structure or It consists of a multi-tuned mass attenuator coupled to the c-beam, characterized in that it absorbs the vibration of the bottom plate to reduce the floor impact sound.

In addition, the multi-tuning mass attenuator constituting the floor-floor interlayer noise reduction device using the cantilever-type multi-tuning mass attenuator of the present invention is connected to the bottom plate so that a weight having 1 to 2% of the bottom plate mass has rigidity and damping. Characterized in that it is configured.

The multi-tuned mass attenuator constituting the floor-floor interlayer noise reduction device using the cantilever-type multi-tuned mass damper of the present invention is characterized in that the cantilever-type tuned mass attenuator is formed symmetrically.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same number as much as possible even if displayed on different drawings.

The present invention is to reduce the heavy impact sound caused by the vibration of the floor plate of the noise that is a problem in the apartment house, and to reduce the vibration of the floor plate using a multi-tuned mass damper.

The multi-tuned mass attenuator is configured by connecting a weight having 1 to 2% of the bottom plate mass to the bottom plate to have rigidity and attenuation, thereby absorbing vibration of the bottom plate to reduce the floor impact sound.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a schematic diagram showing a cantilever type tuned mass damper.

The cantilever-type tuned mass damper 20 shown in the drawing is tuned by tuning the natural frequency of the structure (architecture or civil engineering building or floor plate, etc.) 10 to be damped and the frequency of itself (tuned mass damper). It is a device that absorbs the vibration energy of the structure instead of itself and reduces the vibration of the structure.

When the length of the cantilever is L, the cross-sectional area is A, the cross-sectional secondary moment is I, the elastic modulus of the cantilever is E, and the mass is M, the optimum frequency of the tuned mass damper is obtained by Equation 1 below.

Equation 1 ω _TMD, ω, in the μ denotes a weight ratio of the effective angular frequency, tuned mass damper and structure of the tuned mass damper natural angular frequency, structure, respectively, f _TMD and f is the effective of natural frequencies and the structure of each tuned mass damper Frequency is indicated.

The natural frequency is related to the angular frequency and Equation 2 below.

The optimum stiffness k _TMD of the tuned mass damper is obtained from the optimum frequency obtained from Equation 1 as shown in Equation 3 below.

In Equation 3, m _TMD is the mass of the tuned mass damper.

On the other hand, k _TMD , the bending rigidity of the cantilever, is obtained as shown in Equation 4 below as a physical formula.

The angular frequency of the tuned mass damper is obtained as shown in Equation 5 below.

If equations 3 and 4 above are the same relations, the natural frequencies of the cantilever-type tuned mass reducers can be obtained from Equations 2 to 5 as shown in Equation 6 below.

The optimal damping ratio ξ _TMD of the tuned mass damper is obtained by the following equation.

Since the frequency of the attenuator is matched to the frequency of the main structure as shown in Equation 1 above, that is, the tuning is called a tuning mass damper.

When only one tuning mass damper obtained by the above equation is installed, the mass of the mass is so large that it is difficult to install in the ceiling, or when the mass of the bottom plate changes due to furniture arrangement, etc. In many cases, the attenuator's performance depends on the calculation error of the stiffness.

Accordingly, the present invention solves this problem by determining a range of the optimum stiffness and the optimum attenuation values obtained by the above Equations 3 and 7 and installing a plurality of tuned mass dampers, i.e., multiple tuned mass dampers shown in FIGS. I tried to solve.

2 is a schematic diagram showing a state in which the multi-tuned mass attenuator of the present invention is installed using I-shaped steel, and FIG. 3 is a schematic diagram showing a state in which the multi-tuned mass attenuator of the present invention is installed using a c-beam.

As shown in the figure, the multi-tuned mass attenuator of the present invention is formed by the cantilever-type tuned mass attenuator 20 being provided symmetrically.

This will be described in detail as follows.

That is, as shown in Figure 2, to the lower end of the bottom plate 3, which is a structure installed below the bottom finishing material 1 of the two-layer structure by attaching the I-shaped steel (5) by the anchor bolt (5a) as a coupling member, The lower end of the I-shaped steel (5) is coupled to the cantilever-type tuning mass damper (20) symmetrically by a fixing bolt and a nut (5b) as a fixing member to form a multiple tuning mass damper.

FIG. 3 shows two C-beams 9 instead of I-beams 5 and attaches them to the bottom of the bottom plate 3, and attaches a cantilever-type tuned mass damper 20 to the bottom of the C-beams 9. It consists of multiple symmetric mass dampers by combining them symmetrically.

In the drawings, reference numeral 7 denotes a ceiling surface of the one-layer structure.

In the above configuration, the multi-tuned mass attenuator is configured by connecting a weight having 1 to 2% of the mass of the bottom plate 3 to the bottom plate 3 so as to have rigidity and attenuation. Absorbs and reduces floor shock.

Hereinafter, the design of the tuned mass damper will be described with reference to Examples.

Example 1

When the effective mass of the bottom plate 3 is 3000 kg and the natural frequency is 50 Hz, a cantilever-type tuned mass damper suitable for this is designed as follows.

If the mass of the tuned mass damper is set to 1% of the bottom plate effective mass, the mass of the tuned mass damper is 30 kg, and the mass ratio μ is 0.01.

Since one mass of the tuned mass damper is too large, it is divided into 10 and manufactured at 3 kg per piece. In other words, m _TMD is 3kg (size 7cm × 7cm × 7.8cm, iron density 7850kg / m ³ )

The frequency of the tuned mass damper is obtained from Equation 1 above as follows.

a) Cross section: 5cm wide and 1cm thick → I = (5 × 1 ³ ) / 12 = 0.417cm ⁴

b) Modulus of elasticity: 2.1 × 10 ⁷ N / cm ²

c) mass: 3 kg

When the cantilever is equal to a and b c above, the length L of the cantilever is calculated as follows from Equation 6 above.

The optimum damping ratio ξ _TMD is obtained from Equation 7 as follows.

The multi-tuned mass attenuator of the present invention can be installed in a ceiling space of about 20 cm according to the mandatory installation of the sprinkler because the required height is 10 cm or less when installed on the ceiling of the lower floor.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

As described above, the floor-mounted floor-to-floor noise reduction device using the cantilever-type multiple tuned mass damper of the present invention can effectively reduce the occurrence of floor impact sound by absorbing the vibration of the bottom plate, and instead of a single tuned mass damper, Since it is composed of a multi-mass attenuator made in the construction can reduce the error in the calculation, and also because the height required for installation is less than 10cm there is an advantage that can be sufficiently installed in the structure ceiling space of about 20cm.

Claims (4)

I-shaped steel is attached to the bottom of the bottom plate, which is a structure installed under the bottom finishing material of the structure by a coupling member, and a ceiling using a cantilever-type multi-tuned mass damper coupled to the bottom of the I-shaped steel by a locking member. In the floor-mounted floor noise reduction device, The multi-tuned mass attenuator is a floor-mounted floor noise reduction device using a cantilever-type multi-tuned mass attenuator, characterized in that the weight body having 1 to 2% of the bottom plate mass is connected to the bottom plate to have rigidity and attenuation. . Two c-beams are attached to the bottom of the bottom plate, which is a structure installed below the bottom finish of the structure, by a coupling member, and a cantilever-type multi-tuned mass attenuator coupled to the bottom of the c-beams by a tuning member. In the floor-mounted floor noise reduction device used, The multi-tuned mass attenuator is a floor-mounted floor noise reduction device using a cantilever-type multi-tuned mass attenuator, characterized in that the weight body having 1 to 2% of the bottom plate mass is connected to the bottom plate to have rigidity and attenuation. . delete The method according to claim 1 or 2, The multi-tuned mass attenuator is a cantilever-type tuned mass attenuator is formed symmetrically left and right floor-mounted floor interlayer noise reduction device using a cantilever-type multi-tuned mass attenuator.

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