CN203981639U

CN203981639U - Reverberation chamber random incidence absorption coefficient test fixture

Info

Publication number: CN203981639U
Application number: CN201420467357.6U
Authority: CN
Inventors: 何剑杰; 谢新星; 杨杉苗; 贺凯宁
Original assignee: Ningbo Tuopu Group Co Ltd
Current assignee: Ningbo Tuopu Group Co Ltd
Priority date: 2014-08-19
Filing date: 2014-08-19
Publication date: 2014-12-03
Anticipated expiration: 2024-08-19

Abstract

The utility model discloses a kind of reverberation chamber random incidence absorption coefficient test fixture, it comprises the frock body (2) that fiberglass is made, this frock body (2) is rectangular parallelepiped, its upper surface is the smooth surface (1) fitting with the lower surface that is detected part, and on a frock body (2), has the curved surface (1) that two or more place detected part.Adopt after above structure, make not have gap between detected part and frock, also just avoid interference the test of the acoustical absorption coefficient of detected part; Meanwhile, fiberglass itself does not possess sound absorption, therefore, can guarantee that the experimental data drawing is more true and reliable.

Description

Reverberation chamber random incidence absorption coefficient test fixture

Technical field

The utility model relates to checkout equipment technical field, is specifically a kind of reverberation chamber random incidence absorption coefficient test fixture.

Background technology

Reverberation chamber, refer to that an energy is uniformly distributed sound in finite space the inside, can not form local overstocking and completely non-directional sound is dispersed in to each local laboratory, therefore, for each parts with sound absorption on automobile, all can carry out the test of reverberation chamber random incidence absorption coefficient.In reverberation chamber, be provided with for placing the frock of each detected part, in industry, this frock is exactly the effect that is equivalent to play a positioning table, in industry, is commonly referred to as frock.The area of this frock will meet the area of defined in examination criteria, normally at 10m ²left and right, therefore, is normally emitted on a plurality of frocks that are placed with detected part together side by side.As shown in Figure 1, in prior art, this frock is made by cement 01, generally after cement mixing becomes grout, to be poured in wooden frame 03, with the surface of detected part, remove to suppress unfashioned grout again, after making the upper surface of grout there is the shape the same with detected piece surface, take detected part away, wait for the grout hardening by cooling moulding in wooden frame 03.But there is following shortcoming in this frock:

1) due to the characteristic of cement itself, it is very coarse making the upper surface of frock after making and the laminating of detected part, therefore, when detected part is placed in frock, detected part and frock can not be fitted effectively, make to have certain gap between detected part and frock, that is to say, the air loss existing in gap a part of acoustic energy, make the acoustical absorption coefficient test result of detected part higher; Meanwhile, cement 01 itself has all possessed higher sound absorption with wooden frame itself, and therefore, they have equally also disturbed the test of the acoustical absorption coefficient of detected part, thereby make the experimental data drawing have certain error;

2) in addition, the weight of the frock of cement production systD is very heavy, therefore, when these frocks of carrying, will require great effort very much; Meanwhile, the weight limits of cement area and the volume of wooden frame 03, in frock, can only place one or two detected part, do not reach 10m far away ²area requirements, therefore, a plurality of wooden frames 03 must be discharged side by side, and the out-of-flatness at wooden frame edge certainly will cause the laminating degree between wooden frame and wooden frame low, make to exist between wooden frame and wooden frame certain gap, equally, also affected the test of the acoustical absorption coefficient of detected part;

3) for convenient in carrying, conventionally can four wooden feets 02 be set at four of the bottom surfaces of wooden frame 03 edge, therefore, between wooden frame bottom surface and ground, also have a space, according to the propagation of air, the test of the acoustical absorption coefficient of detected part also can be disturbed in this space;

4) after detected part is placed in frock, for make detected part can be more docile be placed in frock, need to be with adhesive tape, edge and the frock of detected part is bonding, after finishing, test needs adhesive tape to tear from frock, feature due to cement products, when adhesive tape is torn, can take away one deck cement of frock upper surface, therefore, the cement frock of disappearance can affect the next detected frock of part and the experimental data of test.

In prior art: 01, cement; 02, feet; 03, wooden frame;

The utility model: 1, curved surface; 2, frock body; 3, bonding plane; 4, sidewall; 5, cavity.

Utility model content

Technical problem to be solved in the utility model is, provides a kind of lightweight and do not affect the reverberation chamber random incidence absorption coefficient test fixture of the sound absorption test of detected part.

For solving the problems of the technologies described above, the reverberation chamber random incidence absorption coefficient test fixture that the utility model provides, it comprises the frock body that fiberglass is made, this frock body is rectangular parallelepiped, its upper surface is the smooth surface fitting with the lower surface that is detected part, and on a frock body, has the curved surface that two or more place detected part.

Four sidewalls of described frock body are four planes that directly contact with ground, and the inside of frock body is cavity.

Each curved edges of the upper surface of described frock body all has by adhesive tape and will be detected the bonding bonding plane of part and frock body.

Adopt after this structure, the utility model compared with prior art, has advantages of following:

1) the frock body of making due to fiberglass, smooth surface, therefore, detected part and frock can fit together effectively, that is to say, when detected part is placed in frock, make not have gap between detected part and frock, also just avoid interference the test of the acoustical absorption coefficient of detected part; Meanwhile, fiberglass itself does not possess sound absorption, therefore, can guarantee that the experimental data drawing is more true and reliable;

2) frock of the present utility model is lightweight, and cost is low, greatly facilitates its carrying; , due to lightweight, in frock, can place after two or more detected parts meanwhile, also can easily carry; In addition, a plurality of frocks side by side after discharge, due to four smooth sidewalls, make the laminating degree between frock and frock better, have also eliminated the gap existing between wooden frame and wooden frame in prior art, therefore, have more guaranteed the test of the acoustical absorption coefficient of detected part;

3) and the back side of frock body is cavity, more alleviated weight, also convenient carrying, therefore, without in frock bottom, four feets being set, but four sidewalls directly contact with ground, eliminated the gap between feet and ground, therefore, completely cut off the propagation of air, more the experiment accuracy of the test of the acoustical absorption coefficient of the detected part of assurance;

4) again because the edge at each curved surface all has the bonding plane for adhesive tape bonding, therefore, when adhesive tape can be more docile by detected part and the bonding of frock; And after adhesive tape is torn, also can not take away the material on frock surface, therefore, guaranteed the usability of frock next time.

Accompanying drawing explanation

Fig. 1 is the structural representation of frock in prior art.

Fig. 2 is the unitized construction schematic diagram of the utility model reverberation chamber random incidence absorption coefficient test fixture.

Fig. 3 is the plan structure schematic diagram of single frock in the utility model.

Fig. 4 is that in the utility model, the master of single frock looks perspective view.

Fig. 5 is single frock back side perspective view in the utility model.

Wherein,

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.

Structural representation from the utility model reverberation chamber random incidence absorption coefficient test fixture shown in Fig. 2～Fig. 5, it comprises the frock body 2 that fiberglass is made, this frock body 2 is rectangular parallelepiped, its upper surface is the smooth surface 1 fitting with the lower surface that is detected part, and on a frock body 2, has the curved surface 1 that two or more place detected part.In the present embodiment, on a frock body 2, there are two curved surfaces 1 that can place detected part.

Four sidewalls 4 of described frock body 2 are four planes that directly contact with ground, and the inside of frock body 2 is cavity 5.

Each curved surface 1 edge of the described upper surface of determining frock body 2 all has by adhesive tape and will be detected the bonding bonding plane 3 of part and frock body 2.

The positioning table of reverberation chamber random incidence absorption coefficient test of the present utility model is used in use in groups, as shown in Figure 2, and after a plurality of frocks are stacked side by side, very close to each other between frock and frock, also very close to each other between frock and ground, therefore, reduced the impact of air on test experiments.And frock itself is lightweight, easily carrying.

The two carries out the experiment test of acoustical absorption coefficient the frock that the frock of cement production systD and fiberglass are made, and draws following test result:

Sound wave (HZ)	The acoustical absorption coefficient of cement frock	The acoustical absorption coefficient of fiberglass frock
			400	0.20	0.05
500	0.23	0.04
			630	0.20	0.04
800	0.22	0.03
			1000	0.16	0.04
1250	0.16	0.03

1600	0.15	0.02
			2000	0.13	0.03
2500	0.16	0.03
			3150	0.16	0.02
4000	0.16	0.01
			5000	0.16	0.02
6300	0.16	0.01
			8000	0.16	0.02
10000	0.15	0.01

Therefore, from above experimental results, can draw, frock of the present utility model is very small to the sound absorption of sound wave, contrary, in prior art, the frock of cement production systD is but the sound wave that has absorbed quite a few, is greatly unfavorable for the test of the acoustical absorption coefficient of part.

The utility model is not limited to above-described structure, and wherein, according to shape and the size of the detected part of reality, frock also can be placed the curved surface of three or four or more detected parts.Within these variations fall into protection domain of the present utility model.

Claims

1. a reverberation chamber random incidence absorption coefficient test fixture, it is characterized in that: it comprises the frock body (2) that fiberglass is made, this frock body (2) is rectangular parallelepiped, its upper surface is the smooth surface (1) fitting with the lower surface that is detected part, and on a frock body (2), has the curved surface (1) that two or more place detected part.

2. reverberation chamber random incidence absorption coefficient test fixture according to claim 1, it is characterized in that: four planes of four sidewalls (4) of described frock body (2) for directly contacting with ground, and the inside of frock body (2) is cavity (5).

3. reverberation chamber random incidence absorption coefficient test fixture according to claim 2, is characterized in that: each curved surface (1) edge of the upper surface of described frock body (2) all has by adhesive tape will be detected part and the bonding bonding plane (3) of frock body (2).