Sound insulation cotton for mining machine
L = 10lg (10 ^ (L / 10) + 10 ^ (L / 10)) = 10lg (2 * 10 ^ (L / 10)) = L + 10 * LG2 = 60 + 10 * 0.301 = 63
pro, give me a good comment
Glass fiber sound insulation cotton is divided into two types: cotton roll and cotton board. The volume weight of cotton roll is small, and the price of Bofu per flat is as low as a few yuan, and the high price is only 10 yuan; The bulk density of cotton board is 30km, and eggplant of 90km can be made to order. The most commonly used eggplant is 35km and 40km, the price is between 15 yuan and 20 yuan per flat 1, after the sound insulation of the door , e to the effective filling of the cavity in the door, the sound of closing the door becomes extremely ll and heavy, from "banging" to "puffing". It sounds very comfortable, and no longer has the sound like a broken Gong in the past 2, after the sound insulation of the front and rear covers, firewalls and bottom plates, the screeching sound of the engine's valves is filtered out, leaving only the sound of low idle speed and the vibration feeling at the foot. After the temperature of the water tank rises, the tachometer drops to 1000 rpm. When idling, you can hear the engine running when you feel it carefully in the car, which almost feels like flameout 3 , rece and effectively alleviate the metal fatigue of chassis , and extend the service life of car body. The reason of metal fatigue is that the uneven structure inside the metal causes the imbalance of stress transfer, and some places will become stress concentration areas
extended data:
sound insulation cotton is useless and harmful to human body, especially lung. Sound insulation cotton used to be used as insulation material, but now few people use it. Sound insulation cotton is glass fiber, easy to drill into the skin, do not inhale in the lung, sound insulation effect is general, not very good, good sound insulation cotton is bright yellow, generally 2 cm thick
Only when it is filled in the middle of the "cavity sound insulation structure formed by gypsum board and high density board", can it increase the sound insulation effectthe effect of sound insulation cotton curtain is not bad. In order to make the sound insulation curtain work normally, we should pay more attention to maintenance in daily life. Because the curtain box on the top of it has a winding shaft, we should check it regularly to see whether the winding shaft can rotate smoothly, whether it will be dry or stuck, and drip oil regularly
useful , glass fiber sound insulation cotton is divided into two types: cotton roll and cotton board. The volume weight of cotton roll is small, and the price of Bofu per flat is as low as a few yuan, and the high price is only 10 yuan; The bulk density of cotton board is 30km, and eggplant of 90km can be made to order. The most commonly used eggplant is 35km long, and 40km long. the price per flat is between 15 yuan and 20 yuan
polyacid fiber sound insulation paper is relatively more expensive, mainly e to the use of polyphenyl fiber material, new environmental protection, soft touch and other advantages, the specification is roughly the same as glass fiber sound insulation cotton, the main difference is that it is used in crowded places, and the price is higher
principle of sound insulation cotton: sound is generated by object vibration → sound is transmitted in the air → cotton has multi fiber structure → sound is reflected, overlapped and collided by countless fibers when passing through cotton, and sound energy is converted into heat energy → sound intensity is weakened → sound disappears
another function of the sound insulation cotton is heat insulation, which can rece the heat transferred from the engine to the surface of the hood when the engine is running, and the vehicles equipped with the sound insulation cotton will not proce white fog in rainy days
in rainy days and winter, e to the large temperature difference between the external air temperature and the engine, and the washing of the engine hood by rain, the oxidation of the paint surface will be accelerated
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extended information:
1. After the door is soundproofed, e to the effective filling of the inner cavity of the door, the sound of closing the door becomes extremely ll and heavy, from "bang" to "puff". It sounds very comfortable, and there is no longer the sound like a broken Gong in the past, After the temperature of the water tank rises, the tachometer drops to 1000 rpm. When idling, you can hear the engine running carefully in the car. It almost feels like flameout
at this time, turn on the stereo to enjoy the music, and you will find that the effect has been significantly improved. In the past, you have to turn the volume to a high level to suppress the noise of the engine
when the car is on the road, most of the tire noise and road noise are suppressed at low speed. When the car accelerates to 2500 rpm, the engine makes a ll low roar, and the speed soon goes up to 120 mph. I feel that there is still room to improve the speed. The smoothness of the car is greatly increased. When the car passes the uneven road, the feeling of four doors ringing and falling apart is gone, and the shock absorption and cushioning performance of the car is significantly improved
Sound insulation cotton is a common building sound insulation material with good sound absorption characteristics. Can be made into wallboard, ceiling, space absorber, can absorb a lot of room sound energy, so as to rece noise
1. Is sound insulation cotton useful
principle of sound insulation cotton: sound is generated by object vibration → sound is transmitted in the air → cotton has multi fiber structure → sound is reflected, overlapped and collided by countless fibers when passing through cotton, and sound energy is converted into heat energy → sound intensity is weakened → sound disappears
another function of the sound insulation cotton is heat insulation, which can rece the heat transferred from the engine to the surface of the hood when the engine is running, and the vehicles equipped with the sound insulation cotton will not proce white fog in rainy days. In rainy days and winter, e to the large temperature difference between the external air temperature and the engine, and the combined effect of rain on the hood, the oxidation of the paint surface will be accelerated
How much is the sound insulation cottonmany friends often ask the first question when consulting the sound insulation cotton, how much is it? The quality of sound insulation cotton is divided into 369 grades. The price of sound insulation cotton is different e to different factors such as material, bulk density, color, specification, environmental protection type, fire rating and so on
factors affecting the price of sound insulation cotton
through the law of commodity value, we know that the value of commodity is determined by social labor time, the value of proct depends on the proct price, and the relationship between supply and demand of proct affects the price of commodity; Price always fluctuates around value. Therefore, the proct price is related to the proction technology, work efficiency, material composition, bulk density, environmental protection function, fire rating, etc
The proct is fluffy material, with a large number of internal and external connected small holes, uniform texture distribution, strong vertical and horizontal ability, soft touch and smooth surface; It is suggested to purchase non combustible or flame retardant materials to meet the fire protection standard; It has certain environmental protection function to protect people's physical and mental healthprice of sound insulation cotton
here, I'd like to introce the price of common sound insulation cotton for your reference only
There are two kinds of glass fiber sound insulation cotton: cotton roll and cotton board. The volume weight of cotton roll is small, and the price of Bofu per flat is as low as a few yuan, and the high price is only 10 yuan; Cotton boardbulk density 30km, 90 km eggplant can be customized, the most commonly used are 35km resistant and 40km eggplant, the price per flat is between 15 yuan and 20 yuan
polyacid fiber sound insulation paper is relatively more expensive, mainly e to the use of polyphenyl fiber material, new environmental protection, soft touch and other advantages, the specification is roughly the same as glass fiber sound insulation cotton, the main difference is that it is used in crowded places, and the price is higher
How about the effect of sound insulation cotton? We also need to use the truth to explain that time is the standard to test the truth. We will use the results of the following experiment to advance your decisionExperiment 1: thick curtain
the selected flannel curtain costs 40 yuan per square meter, with a thickness of 2 mm. First, he covered the curtain with a single layer over his mobile phone, played songs, and held a noise meter to test at a distance of 20 cm for 3 minutes. The highest voice was 67.9 dB, and the lowest was 59.9 dB
Experiment 2: Carpet
the wool carpet used in the experiment is about 80 yuan / m2. According to the same method, the highest volume is 63.5 dB and the lowest is 56.2 dB
Experiment 3: sound insulation cotton
a piece of 300 g sound insulation cotton, which is the most common specification on the market, was selected. The price is about 50 yuan / m2, and the volume drops obviously. The measured noise value is 57.9 dB at the highest and 48.3 dB at the lowest
Experiment 4: the multi-layer glass
glass wall is a double-layer structure, holding the mobile phone to play songs in a strong way, and testing at about 20 cm outside the wall, the highest volume is 62.4 dB, and the lowest is 59.4 dB
experimental principle
"there are two factors that affect the sound size, one is the sound insulation material, the other is the sound source distance. At the same distance, different materials are used to block the same sound source, and the decibel value measured by the noise meter is the sound insulation effect of each material
in this experiment, the best noise rection effect is the sound insulation cotton, which blocks 15.9db noise, and the worst is the thick curtain, which only blocks 5.9db noise
"although the curtain is thick, it has few pores and its surface is not smooth enough, which can neither effectively absorb noise nor reflect sound waves back." Due to the soft fabric, the curtain can not completely cover the window in actual use, so the actual noise rection effect should be discounted. Although the interior of the carpet has more pores than the curtain, it is not enough to absorb a lot of noise. There is air in the interlayer of multi-layer glass and sound insulation cotton, which blocks and absorbs sound waves, so it has good noise rection effect
Sound absorption cotton and sound insulation cotton are very good decorative materials for sound insulation. What are the differences between sound absorption cotton and sound insulation cotton
difference between sound-absorbing cotton and sound insulation cotton. The sound insulation material does block the sound transmission, but it is easy to cause sound energy reflection
good sound-absorbing and sound insulation materials, for example, our main purpose is sound insulation, so to put it bluntly is to "eliminate" the noise. For example, "gradient sound-absorbing cotton" is a kind of porous material with laminated stepped density. The holes inside are connected. After the sound goes in, it rubs against the wall of the material hole, and the energy is transformed, so as to achieve the purpose of attenuation of sound energy
if the sound insulation cotton is pasted directly on the glass wall, the right material should have a certain effect. There are two cases of no effect: one is that the material itself has no effect, which is related to the material and structure. If you use gradient sound-absorbing cotton, you will find that it can proce effect
another case is that the normal installation method of sound insulation cotton should be filled in the keel, and then sealed with plate. That is to say, only in this way can the effect of installation be maximized. If good materials such as gradient sound-absorbing cotton are used, the sound insulation effect will be different from that of keel installation. Of course, you can also choose high barrier sound felt, this material, its sound insulation effect is quite remarkable
sound-absorbing cotton and foam which soundproof
1, certainly sound absorbing cotton has better sound insulation than foam. The mechanism of silencing shows that the sound can play the role of silencing only when it is transformed into heat energy through the friction between the sound and the wall of the hole. The emphasis here is on connectivity. Only in this way can the structure be continued and the effect be good. Although foams are porous materials, their pores are not connected but closed indivially, so there is no good silencing effect, and the natural sound insulation effect is limited.
2. The sound-absorbing cotton also has many differences according to the material. For example, the glass wool upstairs has the performance of sound-absorbing material in structure, but its fiber is glass fiber, which is a kind of brittle fiber. The energy absorption performance of brittle material can not be compared with that of flexible fiber, such as polyester fiber sound-absorbing cotton in the same density, At the same thickness, the sound attenuation performance is much better than that of glass wool. Glass wool is composed of brittle fiber, which is like a tiny needle. It will penetrate into the skin and cause skin allergy. Dust will naturally cause respiratory tract allergy, so it is not recommended to use it indoors
3. Flexible fiber sound-absorbing cotton is also distinguished, which is a structural distinction. One is the average density of polyester fiber sound-absorbing cotton, which is common in the market, and usually has better sound absorption for medium and high frequency. Second, the gradient sound-absorbing cotton, its layered density is differentiated, the general feeling on the hand is soft on one side and hard on the other. This kind of gradient sound-absorbing cotton has the function of wide sound-absorbing frequency and can absorb the sound of low frequency, medium frequency and high frequency at the same time. For example, the sound of electrical appliances in the room, the slippers upstairs, and the vibration of the wall and ground caused by the neighbor's stereo
What are the differences between sound-absorbing cotton and sound insulation cotton? Whether it is sound-absorbing cotton or sound insulation cotton, it can play a good sound insulation effect. As for which kind of material is better, it will be selected according to the actual situation of the indivial. When you decorate the house, you can refer to the surrounding environment, decoration difficulty, price and other factors to ensure that you can choose a good sound insulation material for yourself. In addition to sound-absorbing cotton, sound insulation cotton and other materials, there are other decorative materials that people can choose< br />
Everyone wants to live in a clean and noiseless environment, especially when they go to bed at night. They must have a quiet environment to go to sleep and improve the quality of sleep. But sometimes people's living environment is too noisy, there is no good environment in downtown area. At this time, we can only pay more attention to the use of sound insulation materials when decorating. Sound absorption cotton and sound insulation cotton are very good decorative materials for sound insulation. What are the differences between sound absorption cotton and sound insulation cotton
difference between sound-absorbing cotton and sound insulation cotton. The sound insulation material does block the sound transmission, but it is easy to cause sound energy reflection
good sound absorption and sound insulation materials, for example, our main purpose is sound insulation, so to put it bluntly, it is to "eliminate" the noise. For example, "gradient sound-absorbing cotton" is a kind of porous material with laminated stepped density. The holes inside are connected. After the sound goes in, it rubs against the wall of the material hole, and the energy is transformed, so as to achieve the purpose of attenuation of sound energy
if the sound insulation cotton is pasted directly on the glass wall, the right material should have a certain effect. There are two cases of no effect: one is that the material itself has no effect, which is related to the material and structure. If you use gradient sound-absorbing cotton, you will find that it can proce effect
in another case, the normal installation method of sound insulation cotton should be filled in the keel and then sealed with plate. That is to say, only in this way can the effect of installation be maximized. If good materials such as gradient sound-absorbing cotton are used, the sound insulation effect will be different from that of keel installation. Of course, you can also choose high barrier sound felt, this material, its sound insulation effect is quite remarkable
sound-absorbing cotton and foam which soundproof
1, certainly sound absorbent cotton better sound insulation than foam. The mechanism of silencing shows that the sound can play the role of silencing only when it is transformed into heat energy through the friction between the sound and the wall of the hole. The emphasis here is on connectivity. Only in this way can the structure be continued and the effect be good. Although foams are porous materials, their pores are not connected but closed indivially, so there is no good silencing effect, and the natural sound insulation effect is limited. p> There are many differences in sound-absorbing cotton according to the material. For example, the glass wool on the floor has the performance of sound-absorbing material in structure, but its fiber is glass fiber, which is a kind of brittle fiber. The energy absorption performance of brittle material can not be compared with that of flexible fiber. Compared with polyester fiber, the sound absorption performance of sound-absorbing cotton is far better than that of glass wool in the case of the same density and thickness. Glass wool is composed of brittle fiber, which is like a tiny needle. It will penetrate into the skin and cause skin allergy. Dust will naturally cause respiratory tract allergy, so it is not recommended to use it indoors
The first is the average density of polyester fiber sound-absorbing cotton, which is common in the market, and usually has better sound absorption for medium and high frequency. Second, the gradient sound-absorbing cotton, its layered density is differentiated, the general feeling on the hand is soft on one side and hard on the other. This kind of gradient sound-absorbing cotton has the function of wide sound-absorbing frequency and can absorb the sound of low frequency, medium frequency and high frequency at the same time. For example, the sound of electrical appliances in the room, the slippers upstairs, and the vibration of the wall and ground caused by the neighbor's stereo
What are the differences between sound-absorbing cotton and sound insulation cotton? Whether it is sound-absorbing cotton or sound insulation cotton, it can play a good sound insulation effect. As for which kind of material is better, it will be selected according to the actual situation of the indivial. When you decorate the house, you can refer to the surrounding environment, decoration difficulty, price and other factors to ensure that you can choose a good sound insulation material for yourself. In addition to sound-absorbing cotton, sound insulation cotton and other materials, there are other decorative materials that people can choose
good sound-absorbing and sound insulation materials, for example, we mainly aim at sound insulation, so to put it bluntly, we need to "eliminate" the noise. For example, "gradient sound-absorbing cotton", which is a kind of laminated porous material with stepped density, has connectivity. After the sound goes in, it rubs against the wall of the material hole, and the energy is transformed, so as to achieve the purpose of attenuation of sound energy
if you stick the sound insulation cotton directly on the glass wall, it should have a certain effect if you choose the right material. You have two situations: one is that the material used has no effect, which is related to the material and structure. If you use gradient sound-absorbing cotton, you will find that it can proce effect; Another case
, that is to say, the normal installation method of sound insulation cotton should be filled in the keel, and then sealed with plate. That is to say, only in this way can the installation effect be maximized. The direct pasting method can take effect if good materials such as gradient sound-absorbing cotton are used. Of course, the sound insulation effect is different from that of keel installation. Of course, you can also choose
high barrier felt, which also has a remarkable sound insulation effect.
and sound insulation cotton
respectively< First of all, we need to see its brand and quality, which greatly affect the price. The material of common sound-absorbing cotton is
rock wool
, and its price is relatively cheap, only about 10 yuan per square meter; And the imported sound-absorbing cotton is more expensive, the price per square meter will reach thousands of yuan. Most of the sound-absorbing cotton we use at home is about a few yuan
② in addition, the price of sound-absorbing cotton is also related to its thickness and fireproof performance: if the sound-absorbing cotton is not set on fire, it costs 9 yuan per square meter for 3cm thick material and 15 yuan per square meter for 5cm thick material; And fireproof sound-absorbing cotton, the price will be more expensive, 3cm thick material 17 yuan per square meter, 5cm thick material 25 yuan per square meter< 2. How much is the sound insulation cotton?
1. The quality of the sound insulation cotton determines its price difference. Glass fiber sound insulation cotton is commonly used. It exists in the form of
cotton roll and cotton board. The price of the sound insulation cotton made of cotton roll may be several yuan or dozens of yuan per square meter; The price of sound insulation cotton made of cotton board is about 15 ~ 20 yuan per square meter
② the price of polyacid fiber sound insulation cotton is relatively higher. Basically, it is used in places with dense population, and the price is 20-30 yuan per square meter< The difference between sound-absorbing cotton and sound-insulating cotton
1. Sound absorbing cotton
belongs to man-made
inorganic fiber
. The main materials are
quartz sand
,
dolomite
and other natural ores, which are added with
soda ash
and borax and other
chemical materials
to melt into glass, and then blow into flocculent fine fibers in the melting state, The fibers intersect and intertwine with each other, showing many small gaps
the sound-absorbing cotton is divided into glass fiber sound-absorbing cotton and
polyester fiber
sound-absorbing cotton. The attraction effect of these two procts is basically the same, but the environmental protection coefficient of glass fiber is small, the construction is not convenient, and the polyester fiber is not fireproof, easy to burn, and relatively unsafe< There are many tiny pores in the interior of
sound insulation material, which can transform
sound energy
into thermal energy by friction with the material, and the sound insulation coefficient increases graally with the increase of frequency, This means that low frequency absorption is not as good as high frequency absorption
3. Difference
the difference between sound-absorbing cotton and sound insulation cotton is that the reflected sound energy of sound-absorbing cotton is smaller than that of sound insulation cotton; The attenuation and absorption of the sound absorption cotton to the incident sound energy is only a few tenths of a decibel, and the sound absorption capacity
that is, the sound loss coefficient can be expressed as a decimal; The transmitted sound energy of the sound insulation cotton is attenuated to 3 / 10 ~ 4 / 10 of the incident sound energy or less decibels.