CN212353971U

CN212353971U - Light wide-temperature-range layered constraint damping noise reduction profile

Info

Publication number: CN212353971U
Application number: CN202022269210.4U
Authority: CN
Inventors: 张捷; 姚丹; 沈梦露; 李姜; 郭少云
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2021-01-15
Anticipated expiration: 2030-10-13

Abstract

The utility model belongs to the technical field of section bars, and provides a light wide-temperature-range layered constraint damping noise reduction section bar, which comprises an aluminum plate or an aluminum section bar, wherein IIR/EP layered constraint damping structures are respectively adhered on the upper surface and the lower surface of the aluminum plate or the aluminum section bar; the layered constraint damping structure comprises N layers which are composed of IIR layers and EP layers, wherein N is an even number which is more than or equal to 4. The utility model discloses a IIR/EP stratiform restraint damping structure compounds it with the section bar structure, makes this wide temperature domain stratiform restraint of light fall the effective temperature domain scope that the section bar is suitable for of making an uproar wide, effectively improves the section bar sound insulation, reduces section bar sound radiation, reduces the quality of section bar simultaneously, is favorable to realizing the lightweight design of making an uproar of falling of structure.

Description

Light wide-temperature-range layered constraint damping noise reduction profile

Technical Field

The utility model relates to a section bar technical field especially relates to a wide temperature domain stratiform restraint damping of light section bar of making an uproar falls.

Background

The rail transit is a major artery of national economic construction, a national key infrastructure and a significant civil engineering, is one of the backbone and main transportation modes of a comprehensive transportation system, and has a very important position and effect in the national economic and social development. With the continuous improvement of train running speed and the increasing complexity of operation environment, vibration noise is taken as a core scientific problem and becomes a key factor for restricting the 'green environmental protection' and 'sustainable development' of rail transit.

The section bar is a main body structure of a rail transit vehicle body and plays an important role in controlling vibration noise. How to improve the sound insulation of the sectional material and reduce the vibration sound radiation of the sectional material has important significance for controlling the vehicle noise. Damping treatment is one of the most widely used and effective measures for reducing vibration and noise of the section bars. On one hand, the common water-based damping coating has higher density, and can obviously increase the mass of the section bar, which is contradictory to the light-weight design goal of vehicles; on the other hand, the region of China is wide, the temperature difference between the south and the north is extremely large, and the general damping material is difficult to keep high damping performance in a wider temperature range (such as minus 40 ℃ to 50 ℃), so that the environmental application adaptability is poor.

In the prior art, the patent name is a composite layer structure of a high and cold motor train unit body (patent publication number: CN203739894U), and at least the following defects exist:

(1) the device is only suitable for low-temperature environment, and the effective temperature range is too narrow;

(2) the traditional 'one-layer damping layer and one-layer constraint layer' constraint damping structure is adopted, and the damping is low;

(3) the whole quality of the actual structure is increased, and the design of light structure is not facilitated.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a section bar of making an uproar falls in wide temperature range stratiform restraint damping of light for rail vehicle.

The utility model provides a light wide temperature range layered restraint damping noise reduction section bar, which comprises an aluminum plate or an aluminum section bar;

an IIR/EP layered constraint damping structure is respectively adhered to the upper surface and the lower surface of the aluminum plate or the aluminum profile;

the layered constraint damping structure comprises N layers, wherein the N layers are composed of IIR (butyl rubber) layers and EP (epoxy resin) layers, and N is an even number which is more than or equal to 4.

Preferably, N is 8.

Preferably, a first IIR layer is adhered to the upper surface of the aluminum plate or the aluminum profile, and a first EP layer is compounded on the first IIR layer;

compositing a second IIR layer over said first EP layer, compositing a second EP layer over said second IIR layer;

compositing a third IIR layer over said second EP layer, compositing a third EP layer over said third IIR layer;

and compounding a fourth IIR layer on the third EP layer, and compounding a fourth EP layer on the fourth IIR layer.

Preferably, a fifth IIR layer is adhered to the lower surface of the aluminum plate or the aluminum profile, and a fifth EP layer is compounded below the fifth IIR layer;

compounding a sixth IIR layer below the fifth EP layer, and compounding a sixth EP layer below the sixth IIR layer;

compounding a seventh IIR layer below the sixth EP layer, and compounding a seventh EP layer below the seventh IIR layer;

and compounding an eighth IIR layer below the seventh EP layer, and compounding an eighth EP layer below the eighth IIR layer.

Preferably, the layer thickness ratio of the IIR layer to the EP layer is 1-3: 1 to 3.

Preferably, the total thickness of the IIR/EP layered constraint damping structure is 2-5 mm.

Has the advantages that:

the utility model provides a pair of wide temperature domain stratiform restraint damping of light falls section bar of making an uproar has designed an IIR/EP stratiform restraint damping structure, compounds it with the section bar structure, makes this wide temperature domain stratiform restraint of light fall the effective temperature domain wide range that the section bar is suitable for of making an uproar falls in the restraint, effectively improves the section bar sound insulation, reduces section bar sound radiation, reduces the quality of section bar simultaneously, is favorable to realizing the lightweight design of structure.

Drawings

1. Fig. 1 is a schematic structural view of a light wide-temperature range layered constrained damping noise reduction profile provided by an embodiment of the present invention.

Detailed Description

In order to make the light wide-temperature range layered constraint damping noise reduction profile provided by the present invention more clearly understood by those skilled in the art, the following detailed description will be made with reference to the accompanying drawings.

As shown in fig. 1, the utility model provides a light wide temperature range layered restraint damping noise reduction section bar, which specifically comprises an aluminum plate or an aluminum section bar 9;

an IIR/EP layered constraint damping structure 100 is respectively adhered to the upper surface and the lower surface of the aluminum plate or the aluminum profile 9;

the layered constrained damping structure 100 includes N layers, which are formed of an IIR layer and an EP layer, where N is an even number equal to or greater than 4.

N ═ 8, that is, the light wide temperature range layered restraint damping noise reduction section bar is adhered with the IIR/EP layered restraint damping structure 100 containing 8 IIR/EP layers on the upper surface and the lower surface of the aluminum plate or aluminum section bar 9, specifically:

adhering a first IIR layer 1 to the upper surface of the aluminum plate or the aluminum profile 9, and compounding a first EP layer 2 on the first IIR layer 1;

compositing a second IIR layer 3 over said first EP layer 2 and a second EP layer 4 over said second IIR layer 3;

compositing a third IIR layer 5 over said second EP layer 4, compositing a third EP layer 6 over said third IIR layer 5;

a fourth IIR layer 7 is laminated on the third EP layer 6, and a fourth EP layer 8 is laminated on the fourth IIR layer 7.

Preferably, a fifth IIR layer 10 is adhered to the lower surface of the aluminum plate or the aluminum profile 9, and a fifth EP layer 11 is compounded below the fifth IIR layer 10;

compounding a sixth IIR layer 12 below the fifth EP layer 11, and compounding a sixth EP layer 13 below the sixth IIR layer 12;

compounding a seventh IIR layer 14 under the sixth EP layer 13, and compounding a seventh EP layer 15 under the seventh IIR layer 14;

an eighth IIR layer 16 is combined below the seventh EP layer 15, and an eighth EP layer 17 is combined below the eighth IIR layer 16.

For example, when N is 8, that is, the layered constraint damping structure 100 provided in the embodiment of the present invention has 8 layers, each including 4 IIR layers and 4 EP layers, where the thickness of each IIR layer is 0.25mm, the thickness of each EP layer is 0.25mm, and the layer thickness ratio of the two layers is 1:1, the total thickness of the layered restraining and damping structure 100 is 2 mm. Of course, the above description is not intended to limit the embodiments of the present invention.

The specific preparation process comprises the following steps:

(1) preheating a mixing mill at 130 ℃ for 10min, cutting 100phr (paratpersides rubber) IIR raw rubber with a rubber content into sheets, putting the sheets into the mixing mill, and crushing for 10 min;

(2) 100phr of PIB (Polyisobutylene), HDCPD (hydrogenated bicyclic catalyst) was addedPentadiene resin) and 200phr of CaCO₃(calcium carbonate) was added to the mixer and mixed at 130 ℃ for 120 min;

(3) weighing a certain amount of mixed IIR, placing the mixed IIR on a hot-press forming machine, hot-pressing for 5min at 90 ℃ and 10MPa, and then cold-pressing to room temperature under the same pressure for forming, so that the light wide-temperature-range layered constraint damping noise reduction profile has a wide applicable effective temperature range;

(4) setting the total thickness of IIR/EP to be 2mm, the total layer number to be 8 layers and the layer thickness ratio to be 1:1, cutting the IIR and the EP with the single-layer thickness of 0.25mm, and preparing a multi-layer IIR/EP constrained damping structure by utilizing the self-adhesion type of the IIR;

(5) prefabricating a section bar needing noise reduction treatment, wherein the thickness of an upper panel and a lower panel of the section bar is reduced by 2mm compared with the original structure;

(6) and (3) sticking the prepared layered IIR/EP constrained damping structure to the profile processed in the step (5) by using the self-adhesion of the IIR to obtain the light wide-temperature-range layered constrained damping noise reduction profile.

The result of the simulation calculation analysis shows that, using normal temperature 20 ℃ as an example, when the original thickness of the upper and lower panel of the section bar is 3mm, keeping the whole thickness of the section bar unchanged, thinning the upper and lower panel thereof by 2mm, then adopting the utility model discloses a light wide temperature range lamellar restraint damping structure (2mm) is pasted on the upper and lower surfaces thereof, under the condition that the gross thickness is unchanged, can improve the sound insulation 3.0dB of the section bar, reduce the sound radiation 2.7dB of the section bar to reduce the quality of the section bar by 14.4%.

The embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention have been explained herein by using specific embodiments, and the above description of the embodiments is only used to help understand the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. The utility model provides a wide temperature domain stratiform restraint damping of light section bar of making an uproar falls, includes aluminum plate or aluminium alloy, its characterized in that:

the layered constraint damping structure comprises N layers which are composed of IIR layers and EP layers, wherein N is an even number which is more than or equal to 4.

2. The lightweight wide temperature range layered constrained damping noise reduction profile of claim 1, wherein N-8.

3. The light wide-temperature-range layered constrained damping noise reduction profile according to claim 2, wherein:

adhering a first IIR layer to the upper surface of the aluminum plate or the aluminum profile, and compounding a first EP layer on the first IIR layer;

4. The light wide temperature range layered constrained damping noise reduction profile according to claim 2 or 3, characterized in that:

adhering a fifth IIR layer to the lower surface of the aluminum plate or the aluminum profile, and compounding a fifth EP layer below the fifth IIR layer;

5. The light wide-temperature-range layered constraint damping noise reduction profile as claimed in claim 1, wherein the layer thickness ratio of the IIR layer to the EP layer is 1-3: 1 to 3.

6. The light wide-temperature-range layered constraint damping noise reduction profile as claimed in claim 1, wherein the total thickness of the IIR/EP layered constraint damping structure is 2-5 mm.