High noise reduction device applied below high-speed motor train unit train flat top area

Abstract

The utility model relates to a high noise reduction device applied to the lower portion of a flat roof area of a high-speed motor train unit train, and belongs to a top noise reduction device in the high-speed motor train unit train. The flat-top wrapping cloth assembly is bonded in the welding framework and comprises an upper light sound insulation pad, a sound absorption unit, a lower light sound insulation pad and glass fiber cloth. The metamaterial resonance unit has the advantages that the structure is novel, the frequency is customized by applying the metamaterial resonance unit, a good noise reduction effect can be achieved in the noise frequency band with the frequency of 300 Hz or above, and on the basis, the metamaterial resonance unit is combined with noise reduction materials such as a lightweight sound insulation material lightweight sound insulation pad, a lightweight sound insulation pad, lightweight sound absorption cotton and a sound absorption film for use, so that the noise reduction effect is good. Compared with a traditional sound insulation pad, the weight of the flat-top wrapping cloth assembly is reduced by 25%, a welding framework made of aluminum profiles is added, the flat-top wrapping cloth assembly can be tightly attached to a roof profile after the flat-top wrapping cloth assembly is installed on a vehicle body, the noise reduction effect is improved, and the overall structural safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the high -speed motor train unit train in -vehicle top noise reduction device, especially to a kind of high noise reduction device applied to the high -speed motor train unit train flat roof area below. BACKGROUND

[0002] With the rapid development of domestic motor train unit market, motor train unit speed-up demand is more and more urgent, and the research and development of high-speed motor train unit is imminent.Compared with the travel speed of traditional motor train unit, high-speed motor train unit is faster, and the running speed is as high as 400km / h, the noise generated by pantograph in the flat roof area outside the vehicle increases, and through the whole vehicle test, the noise mainly concentrates above 300Hz frequency under the pantograph, the noise generated by pantograph is transmitted to the passenger compartment through the roof profile, which affects the comfort of passengers in the passenger compartment.Therefore, in order to meet the noise reduction target of the external noise in the flat roof area of high-speed motor train unit at a speed of 400km, a device with high noise reduction performance is needed to effectively reduce the external noise generated by the pantograph in the flat roof area of the vehicle and improve the comfort of passengers in the passenger compartment.The safety of installing the flat roof in the train also needs to be considered, that is, the installation structure is fastened after installation, the flat roof cloth can be tightly attached to the roof profile of the flat roof area after installation, and there is no interference with other car body structures below, to ensure the stability and safety of the whole flat roof cloth structure. SUMMARY

[0003] The utility model provides a kind of high noise reduction device applied to the high -speed motor train unit train flat roof area below, to effectively reduce the external noise generated by the pantograph in the flat roof area of the vehicle, to reach the purpose of the noise reduction and structural safety in the high-speed motor train unit.

[0004] The technical scheme adopted by the utility model is: including flat roof cloth assembly and welded framework, wherein the flat roof cloth assembly is bonded in the welded framework.

[0005] The flat roof cloth assembly includes upper lightweight sound insulation pad, sound absorption unit, lower lightweight sound insulation pad and glass fiber cloth, wherein the upper lightweight sound insulation pad, sound absorption unit and lower lightweight sound insulation pad are bonded into an integral piece by adhesive, and glass fiber cloth is wrapped outside.

[0006] The upper lightweight sound insulation pad and lower lightweight sound insulation pad are made of rubber-plastic material, with a density of 1700-1800kg / m³ and a sound insulation of 34-36dB.

[0007] The sound absorption unit comprises a sound absorption film, light sound absorption cotton, sound absorption material, a super material resonance unit and a carbon fiber plate, wherein the super material resonance unit is adhered to the upper surface of the carbon fiber plate by an adhesive, the light sound absorption cotton and the sound absorption material are adhered together by an adhesive, the holes of the two are sleeved outside the super material resonance unit and are adhered to the super material resonance unit, and the lower surfaces of the two are adhered to the upper surface of the carbon fiber plate, and the lower surface of the sound absorption film is adhered to the upper surface of the light sound absorption cotton.

[0008] The sound absorption film is a fiber sound absorption film material with fireproof performance, and has a unit area mass of 200-230 g / m2 and a thickness of 0.15-0.18 mm.

[0009] The light sound absorption cotton is made of EVA, has a density of 50-60 kg / m3 and a noise reduction coefficient NRC of 0.55.

[0010] The sound absorption material is made of open-cell rubber foam, has a density of 200-300 kg / m3 and a noise reduction coefficient NRC of 0.3.

[0011] The super material resonance unit comprises an upper cover plate, an elastomer, a mass block, a shell and a lower cover plate, wherein the elastomer is adhered to the upper and lower surfaces of the mass block and is arranged in the shell, and the upper cover plate and the lower cover plate are adhered to the surface of the elastomer and the edge of the shell, respectively.

[0012] The upper cover plate, the shell and the lower cover plate are made of carbon fiber material, the carbon fiber has a density of 1600 kg / m3-1800 kg / m3 and a tensile strength of 700 MPa-800 MPa, the elastomer is made of polyurethane foam material, has a density of 200-300 kg / m3 and a compression rate of 2%-4%, and the mass block is made of a steel plate.

[0013] The glass fiber cloth is made of glass fiber material, has a thickness of 0.14-0.16 mm, a breaking strength of 1700-1800 N / 50 mm and an elongation at break of 3-5%.

[0014] The utility model discloses a novel structure, through the application super material resonance unit custom frequency, can play good noise reduction effect in the noise frequency section above 300Hz, on this basis, through the combination use of the light sound insulation pad of light sound insulation material, light sound insulation pad, light sound absorption cotton and sound absorption film etc. noise reduction material, make flat top cloth assembly play more remarkable noise reduction effect, improve the comfort of passenger in passenger compartment. Because using light sound insulation pad and light sound insulation pad of light sound insulation material, reduce 25% compared with traditional sound insulation pad, to guarantee the installation structure strength, increased the welding framework of aluminium alloy profile, after installing with the car body, can be close in roof profile, improve the noise reduction effect and guarantee the overall structural safety. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of the utility model;

[0016] Figure 2 is an assembly drawing of the utility model;

[0017] Figure 3 is Figure 1 A-A partial sectional view of the utility model;

[0018] Figure 4 is a structural schematic view of the utility model flat top cloth, the glass fiber cloth is omitted in the drawing;

[0019] Figure 5 is a structural schematic view of the utility model sound absorption unit;

[0020] Figure 6 is a structural schematic view of the utility model super material resonance unit;

[0021] Figure 7 is the frequency sound insulation curve diagram of the utility model. DETAILED DESCRIPTION

[0022] Referring to Figure 1 , 2 , including flat top cloth assembly 1 and welding framework 2, wherein flat top cloth assembly 1 is bonded in welding framework 2, and the welding framework is made of aluminum profile.

[0023] Referring to Figure 3 , 4 , the flat top cloth assembly 1 includes upper lightweight sound insulation pad 1.1, sound absorption unit 1.2, lower lightweight sound insulation pad 1.3 and glass fiber cloth 1.4, wherein upper lightweight sound insulation pad 1.1, sound absorption unit 1.2 and lower lightweight sound insulation pad 1.3 are bonded into an integral piece by adhesive, and are wrapped with glass fiber cloth 1.4 outside.

[0024] The upper lightweight sound insulation pad 1.1 and the lower lightweight sound insulation pad 1.3 are made of rubber plastic material, and the density is 1700 kg / m³, 1750 kg / m³ or 1800 kg / m³, which is 25% lighter than the weight of traditional sound insulation pad, and the sound insulation amount is 34 dB, 35 dB or 36 dB, which can ensure good noise reduction effect while lightening, and achieve the lightweight noise reduction target requirement of sound insulation cover.

[0025] Referring to Figure 5, the sound absorption unit 1.2 includes sound absorption film 1.2.1, light sound absorption cotton 1.2.2, sound absorption material 1.2.3, super material resonance unit 1.2.4 and carbon fiber plate 1.2.5, wherein the super material resonance unit 1.2.4 is adhered to the upper surface of the carbon fiber plate 1.2.5 by an adhesive, the light sound absorption cotton 1.2.2 and the sound absorption material 1.2.3 with open holes are adhered together by an adhesive, the holes of the two are sleeved on and adhered to the super material resonance unit 1.2.4, and the lower surfaces of the two are further adhered to the upper surface of the carbon fiber plate 1.2.5, and the lower surface of the sound absorption film 1.2.1 is adhered to the upper surface of the light sound absorption cotton 1.2.2.

[0026] The sound absorption film 1.2.1 is a fiber sound absorption film material with fireproof performance, the unit area mass is 200 g / m2, 215 g / m2 or 230 g / m2, the thickness is 0.15 mm, 0.16 mm or 0.18 mm, it is more light, thin and breathable than traditional sound absorption materials, it is a new type of sound absorption material combined with other sound insulation materials to achieve excellent noise reduction performance, the noise reduction coefficient NRC can reach 0.55, and it has good sound absorption effect.

[0027] The light sound absorption cotton 1.2.2 is made of EVA, the density is 50 kg / m3, 55 kg / m3 or 60 kg / m3, the noise reduction coefficient NRC is 0.55, and the weight can be reduced by 77% compared with traditional sound absorption materials, so that the flat top cloth assembly can better meet the lightweight design requirements.

[0028] The sound absorption material 1.2.3 is made of open rubber foam, the density is 200 kg / m3, 250 kg / m3 or 300 kg / m3, the noise reduction coefficient NRC is 0.3, and the combination with the light sound absorption cotton can improve the overall noise reduction effect and realize the property of material superposition to enhance the noise reduction function.

[0029] Referring to Figure 6 The super material resonance unit 1.2.4 includes upper cover plate 1.2.4.1, elastic body 1.2.4.2, mass block 1.2.4.3, shell 1.2.4.4 and lower cover plate 1.2.4.5, wherein the elastic body 1.2.4.2 is adhered to the upper and lower surfaces of the mass block 1.2.4.3 respectively and placed in the shell 1.2.4.4, and the upper cover plate 1.2.4.1 and the lower cover plate 1.2.4.5 are adhered to the surface of the elastic body 1.2.4.2 and the edge of the shell 1.2.4.4 respectively. Through the above damping structure, the frequency of the noise reduction can be adjusted, the frequency can be designed and customized according to customer requirements, according to the data analysis of the 400km / h high-speed motor train set, the noise frequency above 300Hz needs to be designed for noise reduction, so the noise reduction frequency of this super material resonance unit covers 300Hz-600HZ frequency band, and through the frequency design, the flat top cloth assembly has good noise reduction effect.

[0030] The upper cover plate 1.2.4.1, the shell 1.2.4.4 and the lower cover plate 1.2.4.5 are respectively carbon fiber material, the carbon fiber density is 1600kg / m³, 1700kg / m³ or 1800kg / m³, the carbon fiber tensile strength is 700MPa, 750MPa or 800MPa, the elastomer 1.2.4.2 is polyurethane material foam, the density is 200kg / m³, 250kg / m³ or 300kg / m³, the compression rate is 2%, 3% or 4%, and the mass block 1.2.4.3 is steel plate.

[0031] The glass fiber cloth 1.4 is glass fiber material, the thickness is 0.14mm, 0.15mm or 0.16mm, the breaking strength is 1700N / 50mm, 1750N / 50mm or 1800N / 50mm, and the breaking elongation is 3%, 4% or 5%, so that the wrapping material with high flexibility can guarantee the flatness of the flat top wrapping cloth after wrapping.

[0032] The effect of the utility model is further illustrated by the test data of the test experiment.

[0033] On the high-speed motor train unit train with a speed of 400km / h, the utility model has good noise reduction effect in the frequency band above 300Hz, meanwhile, the sound insulation amount of the flat top wrapping cloth assembly can reach 44.7dB, the sound insulation level is obviously improved, and the comfort of passengers in the passenger compartment is improved after the train is speeded up. Figure 7 The utility model realizes the control requirement of low noise target under the running state of the high-speed train motor train unit, and improves the comfort of passengers in the passenger compartment after the train is speeded up.

[0034] The structural design of the utility model guarantees the support, fixation and sufficient strength of the product, improves the installation safety of the whole product, and guarantees the functionality and safety of the high-speed train at this position.

Claims

1. A high noise reduction device applied to the area below the flat roof of a high-speed EMU train, characterized by: The flat top cloth assembly is bonded in the welding framework; The flat top cloth assembly comprises an upper light sound insulation pad, a sound absorption unit, a lower light sound insulation pad and a glass cloth, wherein the upper light sound insulation pad, the sound absorption unit and the lower light sound insulation pad are bonded into an integral piece by an adhesive, and the glass cloth is wrapped outside the integral piece. The sound absorption unit comprises a sound absorption film, light sound absorption cotton, sound absorption material, a metamaterial resonance unit and a carbon fiber plate, wherein the metamaterial resonance unit is bonded on the upper surface of the carbon fiber plate by an adhesive, the light sound absorption cotton with holes and the sound absorption material with holes are bonded together by an adhesive, the holes of the light sound absorption cotton and the sound absorption material are sleeved outside the metamaterial resonance unit and are bonded thereto, and the lower surface of the sound absorption material is also bonded to the upper surface of the carbon fiber plate, and the lower surface of the sound absorption film is bonded to the upper surface of the light sound absorption cotton.

2. The high noise reduction device applied to the area below the flat roof of a high-speed train according to claim 1, characterized in that: The upper light sound insulation pad and the lower light sound insulation pad are made of rubber and plastic materials, have a density of 1700-1800 kg / m³ and a sound insulation of 34-36 dB.

3. The high noise reduction device applied to the area below the flat roof of a high-speed train according to claim 1, characterized in that: The sound absorption film is a fiber sound absorption film material with fireproof performance, has a unit area mass of 200-230 g / m² and a thickness of 0.15-0.18 mm.

4. The high noise reduction device applied to the area below the flat roof of a high-speed train according to claim 1, characterized in that: The light sound absorption cotton is made of EVA, has a density of 50-60 kg / m³ and a noise reduction coefficient NRC of 0.

55.

5. The high noise reduction device applied to the area below the flat roof of a high-speed train according to claim 1, characterized in that: The sound absorption material is made of open-cell rubber foam, has a density of 200-300 kg / m³ and a noise reduction coefficient NRC of 0.

3.

6. The high noise reduction device applied to the area below the flat roof of a high-speed train according to claim 1, characterized in that: The metamaterial resonance unit comprises an upper cover plate, an elastomer, a mass block, a shell and a lower cover plate, wherein the elastomer is bonded to the upper and lower surfaces of the mass block and is arranged in the shell, and the upper and lower cover plates are bonded to the surface of the elastomer and the edge of the shell, respectively.

7. The high noise reduction device applied to the underbody of the flat roof area of a high-speed train according to claim 6, characterized in that: The upper cover plate, the shell and the lower cover plate are made of carbon fiber material, the carbon fiber has a density of 1600 kg / m³-1800 kg / m³ and a tensile strength of 700 MPa-800 MPa, the elastomer is made of polyurethane foam, has a density of 200-300 kg / m³ and a compression rate of 2%-4%, and the mass block is made of steel plate.

8. The high noise reduction device applied to the area below the flat roof of a high-speed train according to claim 1, characterized in that: The glass cloth is made of glass fiber material, has a thickness of 0.14-0.16 mm, a breaking strength of 1700-1800 N / 50 mm and an elongation at break of 3-5%.

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