KR20130021054A

KR20130021054A - Dynamic vibration absorber for low frequency sound insulation

Info

Publication number: KR20130021054A
Application number: KR1020110083342A
Authority: KR
Inventors: 주원호; 김성훈
Original assignee: 현대중공업 주식회사
Priority date: 2011-08-22
Filing date: 2011-08-22
Publication date: 2013-03-05

Abstract

The present application relates to a low frequency sound insulating copper reducer, and includes a steel plate, a plurality of vibration dampers, a mass part, and a coupling part. The steel plate protrudes at least a part of the plane and is spaced apart from the ship bulkhead. A plurality of vibration damping agents are attached to each of the upper and lower portions of the plane. The mass part may move by first absorbing the noise of the low frequency band. A coupling part combines the steel plate, the plurality of vibration dampers and the mass parts, and is spaced apart from the vessel partition wall. Therefore, the disclosed technology can attenuate the low frequency band noise generated from the noise source inside the ship, thereby improving the occupancy of the ship and reducing the effect of the low frequency band noise generated from the noise source inside the ship on the crew during navigation. .

Description

DYNAMIC VIBRATION ABSORBER FOR LOW FREQUENCY SOUND INSULATION}

The present application relates to a low frequency sound absorber for low frequency sound insulation, and more particularly, to a low frequency sound absorber for attenuating a low frequency band generated in a noise source of a ship.

Vibration and noise generated during the voyage of the ship cause inconvenience to the crew, and also affect the various structures in the ship, causing difficulty in safe navigation. Therefore, there is a need for a solution to this vibration and noise.

The related art in this regard is disclosed in Korean Patent Laid-Open Publication No. 10-2011-0059958.

The present application provides a low frequency sound absorbing copper reducer capable of attenuating low frequency noise generated from a noise source inside a ship.

Among the embodiments, the low frequency sound absorber is a low frequency sound absorber for attenuating noise in the frequency band (hereinafter, low frequency band) of less than 300Hz generated from the noise source inside the ship, and is installed in the ship partition wall partitioning the ship At least a portion of the plane protrudes, the steel plate is spaced apart from the ship bulkhead, a plurality of vibration dampers attached to each of the upper and lower portions of the plane, the primary can absorb and move the noise of the low frequency band A mass portion and the steel plate, the plurality of vibration dampers and the mass portion are combined, and a coupling portion disposed to be spaced apart from the vessel partition wall.

In one embodiment, the mass part may be weighed in consideration of a change in frequency of noise generated from the noise source. In one embodiment, the steel plate may be determined in length and width in consideration of the change in the frequency of the noise generated from the noise source.

The disclosed technology of the present application can attenuate low frequency band noise generated from a noise source inside a ship.

The disclosed technology of the present application can attenuate low frequency band noise using a copper reducer capable of absorbing low frequency noise. In addition, the attenuated noise can reduce the impact on the crew during navigation.

1 is a perspective view showing a low frequency sound absorbing copper reducer according to an embodiment of the disclosed technology.
FIG. 2 is a cross-sectional view illustrating A-A 'of the low frequency sound absorber of FIG. 1.
3 is a perspective view illustrating the steel plate in FIG. 1.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text. That is, the embodiments may be variously modified and may have various forms, and thus the scope of the disclosed technology should be understood to include equivalents capable of realizing the technical idea. In addition, the objects or effects presented in the disclosed technology does not mean that a specific embodiment should include all or only such effects, and thus the scope of the disclosed technology should not be understood as being limited thereto.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present application.

FIG. 1 is a perspective view illustrating a low frequency sound absorbing copper reducer according to an embodiment of the disclosed technology, and FIG. 2 is a cross-sectional view illustrating A-A 'of the low frequency sound absorbing copper reducer shown in FIG. 1.

1 and 2, the low frequency sound absorbing copper reducer 100 includes a steel plate 110, a plurality of vibration dampers 120, a mass part 130, and a coupling part 140.

The steel plate 110 may be spaced apart from the ship partition wall 200 by protruding at least a portion of the plane 112, and some planes 111 that do not protrude may be coupled to the ship partition wall 200. In one embodiment, the steel plate 110 may be manufactured by processing flat steel. For example, the processing method may be a bending or pressing method.

The plurality of vibration damping agents 120 are coupled to the upper and lower portions of the part of the plane 112 which protrudes. In one embodiment, the plurality of vibration dampers 120 may be stacked and coupled in consideration of a change in low frequency of noise (or vibration) (hereinafter referred to as noise) generated from a noise source. Here, the low frequency may mean a band of about 300 Hz or less. The plurality of vibration dampers 120 may mitigate vibration transmitted to the steel plate 110 and increase durability of the steel plate 110. In one embodiment, the plurality of vibration dampers 120 may be implemented with a material (eg, rubber) effective to mitigate vibration.

The mass unit 130 is disposed to be coupled to the steel plate 110 and is spaced apart from each other, and primarily absorbs low-frequency band noise. In one embodiment, the mass portion 130 may be weighed in consideration of the noise change of the frequency. Here, the mass part 130 may be formed by combining a plurality of mass parts according to the weight reference. In one embodiment, the mass portion 130 may be implemented with a material (eg, rubber or steel) effective to absorb noise in the low frequency band.

The coupling part 140 combines the steel plate 110, the plurality of vibration damping agents 120, and the mass part 130, and is spaced apart from the ship partition wall 200. In one embodiment, the coupling portion 140 may be formed of a bolt, a nut, the bolt may be inserted into the upper portion from the bottom of the steel plate 110 to be coupled. This is to facilitate the change in the weight of the mass portion 130 in consideration of the change in noise of the low frequency.

3 is a perspective view illustrating the steel plate in FIG. 1.

In FIG. 3, the steel plate 110 is determined in length and width in consideration of a change in frequency of noise generated from a noise source. For example, the steel plate 110 may be determined as shown in Table 1 below.

Case frequency Length width thickness Mass part
weight Full untitled Case a 150 Hz 200 mm 200 mm 3.2mm 2 kg 3kg Case b 250 Hz 100mm 100mm 3.2mm 2 kg 2.2 kg

Low frequency band noise generated from a noise source inside the ship may vibrate the mass unit 130. In Table 1, in case A, each of the length and width of the steel plate 110 may be 200 mm for the frequency measured at 150 Hz. In case B, when the frequency is increased to 250 Hz, each of the length and width of the steel plate 110 may be manufactured to 100 mm. This is because, as the frequency increases, the vibration generated in the mass part 130 may also increase, so that the length and width of the steel plate 110 need to be determined in consideration of the vibration in order to control the vibration.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the following claims It can be understood that

100: low frequency sound absorber 110: steel plate
120: damper 130: parts by mass
140: coupling part 200: ship bulkhead

Claims

In a low frequency sound absorber for a low frequency sound insulation provided in a ship partition wall which attenuates the noise of a frequency band of 300 Hz or less (hereinafter, referred to as a low frequency band) generated by a noise source inside a ship,
A steel plate protruding at least a portion of the plane from the vessel partition wall;
A plurality of vibration dampers attached to each of the upper and lower portions of the plane;
A mass part capable of primarily absorbing the low frequency band noise and moving; And
And a coupling portion coupling the steel plate, the plurality of vibration dampers, and the mass portions, the coupling portion being spaced apart from the vessel partition wall.

The method of claim 1, wherein the mass portion
Low frequency sound absorbing copper reducer, characterized in that the weight is determined in consideration of the change in the frequency of the noise generated from the noise source.

The method of claim 1, wherein the steel plate
Low frequency sound absorbing copper reducer, characterized in that the length and width are determined in consideration of the change in the frequency of the noise generated from the noise source.