CN203145222U - Compound resonance plane acoustical board - Google Patents

Abstract

The utility model provides a compound resonance plane acoustical board. The compound resonance plane acoustical board is formed by porous damping layers and a resonator, wherein the resonator is a vibration board and is fixed on a fixed object; the porous damping layers are respectively arranged on the two faces of the vibration board; and viscous connection layers are arranged among the porous damping layers and the vibration board. The compound resonance plane acoustical board disclosed by the utility model has the effects that the occupied size is small the performance is comprehensive; a fiberless sound absorption member is arranged so that the air quality is good; the compound resonance plane acoustical board is convenient to clean and maintain, is practical and has a long service life; the compound resonance plane acoustical board is convenient to mount, is constructed in an assembly form and is good in compatibility; and a protection face is solid and firm and resists mechanical collision.

Description

A kind of multiple resonance plane acoustical board

Technical field

The utility model relates to a kind of acoustical board, relates more specifically to a kind of multiple resonance plane acoustical board for acoustic laboratory.

Background technology

Present known plane acoustical board is divided into perforated acoustic board and resonance acoustic board.

Perforated acoustic board is to adopt punched steel plate, gypsum plank or plank etc. as mask, porous absorption materials such as filling sponge or glass fiber.It has a large amount of inside and outside minim gap and continuous air bubbles that are communicated with.When sound wave incides the acoustical board surface, enter material internal along micropore, cause interstitial air vibration, because the conduction of heat between air and the fiber between friction, air viscosity resistance and space, make quite a few acoustic energy be converted into heat energy and be absorbed.When micropore is sealed by dust dirt or plaster, paint etc., can produce adverse influence to the sound absorbing capabilities of material.Sound absorbing capabilities is mainly high frequency (more than the 200Hz).

Resonance acoustic board is to utilize the air layer of thin plate or film and its back or filler to form resonator system, when incident sound wave frequency during near the natural frequency of resonator system, produces judder.In vibration processes, owing to overcome frictional resistance and sound energy consumption.Therefore the sound absorbing capabilities instability only to low frequency (100Hz is following) effectively, needs could realize the broadband sound absorption in conjunction with sound absorbing member usually.

The utility model content

The purpose of this utility model is to provide a kind of multiple resonance plane acoustical board, to improve the defective that exists in the known technology.

For achieving the above object, the multiple resonance plane acoustical board that the utility model provides is made up of porous damping layer and resonator; Wherein:

Resonator is a vibrating plate, is fixed on the fixed object;

The two sides of this vibrating plate respectively is provided with the porous damping layer, is provided with the viscous articulamentum between porous damping layer and the vibrating plate.

Described multiple resonance plane acoustical board, wherein, acoustical board outside, multiple resonance plane is coated with the punched-plate shell.

Described multiple resonance plane acoustical board, wherein, the punched-plate shell is zinc-plated punched-plate.

Described multiple resonance plane acoustical board, wherein, the porous damping layer is BASF cotton and glass wool.

Described multiple resonance plane acoustical board, wherein, the cotton layer of BASF is in the one side of vibrating plate towards sonic transmissions, and cotton is arranged between sounding board and the fixed object in the glass sound absorption.

Described multiple resonance plane acoustical board, wherein, the thickness of glass sound absorption cotton is greater than the thickness of the cotton layer of BASF in the porous damping layer.

Described multiple resonance plane acoustical board, wherein, vibrating plate is galvanized steel plain sheet.

Described multiple resonance plane acoustical board wherein, is provided with the viscous articulamentum between porous damping layer and the fixed object.

Characteristics of the present utility model are:

1) volume that occupies is little, and performance is comprehensive, saves cost;

2) fiberless sound absorbing member, air quality is good;

3) keep a public place clean with easy to maintenance, physical life is long;

4) installation is convenient, and the assembly type structure is compatible good;

5) anti-mask is the punching galvanized steel plain sheet, is provided with the viscous articulamentum with the porous damping layer, and is firm solid, anti-mechanical collision;

6) plane can be done sound absorption ground, normal walking;

7) light reflects, comfortable working environment etc.

Description of drawings

Fig. 1 is the structural representation of multiple resonance of the present utility model plane acoustical board.

Fig. 2 is after adopting multiple resonance of the present utility model plane acoustical board, BMW Engine Block Test chamber free sound field testing result.

The specific embodiment

Multiple resonance of the present utility model plane acoustical board is made up of porous absorption material and resonator, wherein: resonator is a vibrating plate 1, the two sides of this vibrating plate 1 is respectively arranged with the porous damping layer 2 that porous absorption material is formed, this porous absorption material 2 ' can adopt BASF cotton and glass sound absorption cotton, wherein the cotton layer of BASF is mainly used in the absorbing high-frequency sound wave, preferably be arranged on vibrating plate 1 towards the one side of sonic transmissions, the cotton main low-frequency sound wave that absorbs of glass sound absorption, preferably be arranged between sounding board 1 and the fixed object A, and thickness is connected with viscous articulamentum 3 greater than the thickness of BASF cotton between porous damping layer 2 and the vibrating plate 1.When reality is used, also be provided with viscous articulamentum 3 between multiple resonance of the present utility model plane acoustical board and the fixed object A (such as the indoor wall of needs noise elimination).The utility model adopts zinc-plated punched-plate 5 as the shell of multiple resonance plane acoustical board integral body, and with crashproof protecting against shock, the punching on the zinc-plated punched-plate 5 is in order to guarantee acoustically effective.

Composite resonance sound absorption plate of the present utility model (CPA) is the hybrid system of a kind of porous absorption material and resonator, can think that its sound absorbing capabilities is formed by porous absorption material and sounding board acting in conjunction.Its operating principle is:

Quality-spring system

$f_R=\frac{{\mathrm{<figure-callout\; id="2"\; label="c\; d"\; filenames="DEST\_PATH\_HDA00003378032500011.png"\; state="\{\{state\}\}">c</figure-callout>}}_d}{2\mathrm{\&pi;}}\&CenterDot;\sqrt{\frac{{\mathrm{\&rho;}}_d}{{\mathrm{\&rho;}}_t\&CenterDot;t\&CenterDot;d}}\left[\mathrm{Hz}\right]$ The optimum corresponding vibration frequency of overall sound absorbing capabilities

The plate resonance principle

$f_{x,y}=\frac{\mathrm{\&pi;}}{2}\&CenterDot;\sqrt{\frac{B^{\&prime;}}{m^{\&prime;\&prime;}}}\&CenterDot;[{\left(\frac{x}{L_x}\right)}^2+{\left(\frac{y}{L_y}\right)}^2[\mathrm{Hz}]$ The resonance frequency of plate

Damping layer

$B^{\&prime;}=\frac{E\&CenterDot;{\mathrm{<figure-callout\; id="3"\; label="t"\; filenames="DEST\_PATH\_HDA00003378032500011.png"\; state="\{\{state\}\}">t</figure-callout>}}^3}{12\&CenterDot;(1-{\mathrm{\&mu;}}^2)},x,y=\mathrm{1,2,3},...$ Damped coefficient

Fig. 2 is that to adopt the testing result behind the acoustical board of multiple resonance of the present utility model plane with BMW Engine Block Test chamber be example, illustrates that multiple resonance of the present utility model plane acoustical board has superior acoustically effective.

Claims (8)

1. a multiple resonance plane acoustical board is characterized in that, is made up of porous damping layer and resonator; Wherein:

Resonator is a vibrating plate, is fixed on the fixed object;

The two sides of this vibrating plate respectively is provided with the porous damping layer, is provided with the viscous articulamentum between porous damping layer and the vibrating plate.

2. multiple resonance according to claim 1 plane acoustical board is characterized in that acoustical board outside, multiple resonance plane is coated with the punched-plate shell.

3. multiple resonance according to claim 2 plane acoustical board is characterized in that the punched-plate shell is zinc-plated punched-plate.

4. multiple resonance according to claim 1 plane acoustical board is characterized in that the porous damping layer is BASF cotton and glass wool.

5. multiple resonance according to claim 4 plane acoustical board is characterized in that, the cotton layer of BASF is in the one side of vibrating plate towards sonic transmissions, and cotton is arranged between sounding board and the fixed object in the glass sound absorption.

6. multiple resonance plane acoustical board according to claim 1 or 5 is characterized in that, the cotton thickness of glass sound absorption is greater than the thickness of the cotton layer of BASF in the porous damping layer.

7. multiple resonance according to claim 1 plane acoustical board is characterized in that vibrating plate is galvanized steel plain sheet.

8. multiple resonance according to claim 1 plane acoustical board is characterized in that, is provided with the viscous articulamentum between porous damping layer and the fixed object.

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