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Published: APRIL 25, 2016
Last updated: April 8, 2017
Hi!!
SOUNDPROOF, is shown in this other page as a rain sound-proof of car roof , is actually a shock absorbing material that consists of a combination of special resin and non woven. By mounting to a steel plate attic, a vehicle undercover, roof silencer, you are able to achieve many effects ,which are reduction of the sound, prevention of dew condensation and the thermal barrier. Now, it well developed, they also produce new transparency “AD-sorb” 200 micron mm film type, that can be seen here and some Japanese major manufacturers have launched new Precision mechanical equipment with this products.
Vibration Mechanism
It forms a felt as a collection of restraint type damper , high vibration damping property is developed.
POINT
This is completely different from others dumping material such as a cushion.
Damped vibration Mechanism by antiphase
②When an external force due to vibration is applied , by contact with the organic filler , vibration-damping properties filler become the fulcrum of an inorganic filler, and then finally phase changes . At that time ,because vibration-damping properties filler each other contact, frictional heat is generated.
③Its heat is released in the air , and then it results that vibration energy disappears . After that , each filler is returned to the original stable state.
Vibration-damping properties filler is contacted each other and finally offset each power.
Soundproofing performance in the artificial rain test
This is an equipment used in the test
The amount converted value: 150mm / h
Rain drop height: 5.5m
Test matrial :0.6t aluminum‐zinc alloy‐coated steel sheet
Test specimen dimensions 940 square mm
Attach the steel sheet on the back.
Result of soundproofing of 12db is shown very effective.
Performance of the non-woven fabric damping material
①Performance of the non-woven fabric
Damping, absorbing, insulation non-woven fabric is excellent in terms of its low degradation owing to very high durability against hydrolysis & ultraviolet rays.
②Loss Factor
③Normal incident sound absorption coefficient
You get superiority than other sound-absorbing materials in the frequency band of 800 ~ 2500Hz.
POINTAs the base material to meet the damping performance, a good vibration-damping properties, cost, and its work-ability, non-woven fabric is best.
(Reference) about Sound pressure
|
Sound sources (noise) |
Sound pressure |
|
Jet aircraft, 50 m away |
140 |
|
Threshold of pain |
130 |
|
Threshold of discomfort |
120 |
|
Chainsaw, 1 m distance |
110 |
|
Disco, 1 m from speaker |
100 |
|
Diesel truck, 10 m away |
90 |
|
Kerbside of busy road, 5 m |
80 |
|
Vacuum cleaner, distance 1 m |
70 |
|
Conversational speech, 1 m |
60 |
|
Average home |
50 |
|
Quiet library |
40 |
|
Quiet bedroom at night |
30 |
|
Background in TV studio |
20 |
|
Rustling leaves in the distance |
10 |
|
Hearing threshold |
0 |
(refer from) http://www.sengpielaudio.com/TableOfSoundPressureLevels.htm
(reference)Soundproofing VS Sound absorption VS Damping material
Sound blocking are soundproofing , sound absorption and Damping material.
Soundproofing is a protection, means that if you’re looking to keep what happens in your conference rooms confidential, or if you want to block the sound of your next-door neighbor’s Metallica records.
Sound absorption products, on the other hand, absorb the extra sound waves that bounce around a space and cause poor acoustics, background noise, and bad echo. They don’t stop sound from travelling into adjoining rooms, but they do drastically improve speech intelligibility and the sound quality of rooms, cars,and other enclosed spaces. They improve the quality of the sound within a room.
Damping is the energy dissipation properties of a material or system under cyclical stress. It is the conversion of mechanical energy into thermal energy. The amount of energy dissipated is a measure of the material’s damping level.
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Published: APRIL 25, 2016
Last updated: April 8, 2017