Aluminum Foam for Tunnel
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LUMINUMFOAM NOISE REDUCTION SOLUTIONS AND APPLICATIONS FOR TUNNEL
Characteristics of noise inside tunnel
The noise generated and will bereflected from inner walls of tunnel into the vehicle interior walls when carsor trains pass through the tunnel, the situation of which gets passengers intoextremely harsh noise environment. Not only that, the air at entrance of tunnelwill be formed as pressure and transported to the tunnel exit as soon asvehicles enter the tunnel, the noise formed by compressed air in the exhaustoutlet at breakneck speed will have a great impact power, which might be agreat damage to nearby residents.
According to the characteristics ofnoise existing inside the tunnel, a special voice control system designed andproduced in the material of aluminum foam made by our company. The system iscurrently the most advanced voice solutions for tunnel. (Note: we’ve appliedfor an international patent already)
Generation of noise inside tunnel
1. Characteristics of noise inside tunnel
▲ Air-Borne Sound: vehicles movinginside tunnel
▲ Structure-Borne Sound: vehicles movinginside tunnel
2. Characteristics of noise at the exitof tunnel
▲ Reflection of noise inside tunnel
Thedensity of noise power is very high; Floors and walls inside tunnel are formedentirely reflective, the noise shall be getting into the vehicles strongly ortransformed to the exit of tunnel
▲ Impact noise generated due to pressurechanges
⊙Pressure wave formed at the entrance of tunnel when entering the tunnel
⊙Rapid release of the compressed air pressure wave when it’s reaching to theexit of tunnel
⊙ Agreat impact noise formed
⊙Impact noise changes together with different shapes of tunnel entrance
Noiseof train
Transmissionnoise: noise formed by friction of wheel and rail
Airnoise: noise formed in the moving process of train
Othernoise: noise made by inner equipments of train
Noiseof normal vehicle (cars and trucks)
Frictionnoise: noise formed by friction of wheel and ground
Airnoise: noise formed in the moving process of vehicles
Othernoise: noise made by engines and other inner equipments
Tunnelinternal noise standards with the materials selected
1. Shall be incombustible material
In order to prevent secondary disasteras soon as vehicles crush happens
2. Shall be non-toxic material
Chemical materials shall not be usedas sound-absorbing material, which is in order to avoid toxic gases go out assoon as fire disaster happens
3. Shall not cause dust and secondarypollution
The sound-absorb effect of glass wooland other kinds of rock wool products continues to reduce, carcinogen dust andfine particles from which will give a great damage to human health
4. Shall use environment protectionproduct
Convenient for transporting andconstructing, possibly to do recycle
5. Shall be cleaned by water
Piling of dust and soil inside tunnelshall be cleaned up by using high pressure water regularly, which is to makesure the effect of sound-absorbing; the characteristic of anti-water requiredto be satisfied with sound-absorbing material
6. Shall be used for a long period
Glass wool and other rock wool can notbe used for long time because its self-weight, the sound –absorbing effectcontinues to reduce too, but for the using period of aluminum foam could reachto more than 30 years
7. Shall bear high wind pressure
Making installation rugged durabilityby accurately calculating
Adjustablein accordance with the design specifications and size of tunnel
Installation method ofsound barriers in tunnel.
1. Markthe keel beam installation position inside tunnel
2. Installand fix the keel beam in the tunnel
3.The distance between two keel beams is 500-600m
4.Install Aluminum foam sound-absorbing panel
5. Inset Aluminum alloy frame in orderto fix the Aluminum foam panel
6. Fix it to the beam with bolts
7. In order to prevent the boltsfrom loosening, install sturdy nuts.
*Precautions
1. Materials used inside the tunnel mustbe stainless steel or aluminum.
2. The specification of Aluminum foamsound-absorbing panel is adjustable as the design of the tunnel
3.Color of Aluminum foam sound-absorbing panel can be customized as required.What is AluminumFoam?
Aluminum foam is a new concept metalmaterial which is foamed in sponge shape after melting aluminum ingot with various chemical ingredients and has many bubble layers inner structure.
Porous material is much lighterthan original one, which is the characteristic of porous. And, it improves the ability of energy absorption and reduces the abilityof thermal and electrical conductivities than original metal materials. Inaddition, porous material has wide applications as well as excellent ability ofsound absorption and permeability of liquid, air, etc.
Aluminumfoam, a metal itself, can be applied to aerospace aviation required the thermostability over 200℃. It is a 100% recyclabl ecofriendly material and absolutely will not produceharmful substances no matter in the process of producing, using or abandoning.
Main properties of aluminum foam
Density is 0.2~0.4g/cm3 (Aluminium1/10,Iron1/30, and Wood 1/4)
Soundabsorption
Porous structure has a good soundabsorption.
Aluminum foam sound-absorbing materialcan be used in the inner decoration of buildings (walls, ceiling and floor),railway, highway, factories, mechanical equipment and any other fields.
Suitable for noisy place.
100%non-flammability and no toxic gas released when burning.
Non-combustibility TEST verified to be qualified. <KIMM; IMO A.799 (19)>
I grade Non-flammability TEST ofaluminum foam surface verified to be qualified. <KICT; KS F2271>
Energyabsorption
Porous structure can effectively absorbenergy.
Have a great effect on energyabsorption after a high impact.
Firstly acquired the national SB5class (Guard rail shock-absorber)
Electromagnetic wave shielding ability
Aluminum foam has a function ofabsorbing electromagnetic wave
Widely used in military (stealth materials),TV station, hospital and any other electromagnetic shielding places.
100% recyclable Aluminum foam is nonpoisonous, odorless andharmless, no toxic gas released when burning.
Aluminum foam can be produced by recycled aluminum andits scraps.
ProductFeatures
Item | Aluminum foam composed panel | Aluminum honeycomb plate |
Material | Aluminum | Aluminum |
Structure | Aluminum plate(GRP plate) aluminum foam aluminum plate(GRP plate) | Aluminum plate(GRP plate) aluminum honeycomb aluminum plate(GRP plate) |
（long time immersion and corrosion in water） | Excellent(oxidized pure metal) | Excellent but easy to rust |
Excellent (Non-flammability of pure metal) | General (Glue layer in the middle is not resistant to high temperature) |
ComparisonAluminum Foam with Other Sound-absorbing Materials
Type | Aluminum Foam | Polyester | Glass Fiber | Urethane Form |
Shape |
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Material | Aluminum | Polyester | SiO2, mineral | high molecular Material |
Acoustic absorption(NRC Standar d) | over 0.70 | over 0.70 | over 0.75 | over 0.65 |
Long-term sound absorption | Permanent | Property is decreased | Property is decreased | Property is decreased |
Eco-friendly | 100% recyclable Eco-friendly | No recyclable, flammable, produce little dust | No recyclable, no flammable, arsenic acid cause gas pollution | No recyclable and flammable |
Materials handling & Constructability | Easy handling, using and working under no protective equipment | No damage when handling and using, easy to work under no protective equipment | Low stability. Easy to cause respiratory disease and skin ailments when touching | No damage when handling and using, easy to work under no protective equipment |
Human harmfulness | Harmlessness | Harmlessness | Harmfulness | Poisonous gas (CO, Cyan gas) release when burning |
Waterproofness & Sound absorption | Waterproofness is excellent , stable form, permanent sound absorption | Waterproofness and adhesion is good, stable form | Absorb moisture and poor drainage cause lower acoustic absorption | Absorb moisture and poor drainage cause lower acoustic absorption |
Non-flammability | Ⅰgrade Non-flammability | Heat-resistant | Easy flammable |
- Q:What are the sound-absorbing materials on the wall?
- Fabric sound-absorbing board is placed in the plastic or wood borders of non-combustible micro-porous treatment of the special sound-absorbing surface, made of fire-proof sound-absorbing cloth made from the fire, no dust pollution, decorative strong, simple construction and so on. It is high sound absorption spectrum, high, medium and low noise have a better sound absorption effect.
- Q:Sound-absorbing panels are generally used where
- Theater, studio, studio, auditorium, auditorium, television, radio, business office, multi-function hall, conference room, studio, concert hall, auditorium,
- Q:What is mineral wool sound-absorbing panels, glass fiberboard
- After the milling of the formation of the three-dimensional mineral wool board, the surface made into the size of the box, different width and stripes and other forms.There is a relief type mineral wool board, after compression molding, exquisite surface patterns, a central flower, cross flower, walnut pattern Modeling, is a very good decorative ceiling with profiles.
- Q:What is the sound absorption board?
- Sound-absorbing board refers to the plate with a sound-absorbing noise reduction of the material, wood sound-absorbing panels are refined according to the principle of acoustics, finishes, core materials and sound-absorbing mats.
- Q:What kind of sound-absorbing panels are there in the cinema wall?
- The cinema wall is generally used as a soft cloth for soft cloth
- Q:How is the sound-absorbing board on the wall?
- The order of the wooden sound-absorbing panels is followed, from left to right, from bottom to top. Sound absorber horizontal installation, the recess up; vertical installation, the recess on the right. Part of the solid wood sound-absorbing panels have the requirements of the pattern, each facade should be in accordance with the sound-absorbing board on the preparation of a good number in order from small to large to install.
- Q:Is the noise board the same as the sound-absorbing panel, what's the difference?
- Sound insulation board is used to limit the sound space, must be tight.
- Q:Is the polyester fiber sound absorbing board environmentally friendly?
- Polyester fiber sound-absorbing board safety performance in two aspects, on the one hand the excellent mechanical properties of materials, light weight, impact damage will not like some brittle materials such as perforated gypsum board and cement fiber pressure plate, etc. The block is in danger of falling. On the other hand is the release of harmful substances, the relevant state departments to detect, the formaldehyde emission standards require ≤ 1.5 ㎎ / 1, the test results for 0.05 ㎎ / 1. To meet the national standard GB18580-2001E1 level requirements, in line with the direct requirements for interior decoration.
- Q:What is the principle of sound-absorbing panels?
- All the things that have a long, subtle channel can be used as a sound-absorbing application, such as cotton, all kinds of fiber to help, cotton, sponge, carpet; but like ordinary foam, egg box, wood and the like things basically no sound
- Q:Classification of sound absorbing panels
- Fabric sound-absorbing panels - the core material is centrifugal glass wool. Centrifugal glass wool, as an acoustic material widely used in the world for a long time, has proven to have excellent sound absorption performance.
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Aluminum Foam for Tunnel
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- -
- Supply Capability:
- 50000 m²/month
OKorder Service Pledge
OKorder Financial Service
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