![]() Baier, in Textiles, Polymers and Composites for Buildings, 2010 Noise and sound control For some applications, levels are captured down to as low as 20 Hz, for example, when dealing with wood-framed constructions in Sweden.ī. In building acoustics, sound insulation is usually presented (measured or predicted) in one-third octave bands between Hz. An increase in level of 10 dB is perceived as being double as loud, a decrease in level of 10 dB is perceived as half as loud. A person perceives the change in sound pressure from 2E-4 to 2E-3 Pa as the same as the change from 1 to 10 Pa. The logarithm is used to capture the nature of human perception, namely, that relative changes are perceived the same, as discovered by Weber and Fechner in 1860. Sound reduction indices are presented as levels in decibels (dB). (2.3.4) for the exact calculation of the sound reduction index relative to the levels in the source and receiving rooms. In a simplified fashion this is almost equivalent to saying that the level is 50 dB lower in the receiving room than in the source room. If, however, only 1/10 of the sound power is transmitted, the sound reduction index R = 10 dB, and if only 1/10,000 is transmitted R = 50 dB. So if there is a hole in the wall and all the incident sound power is transmitted through the hole, the sound reduction index R = 0 dB. In other words, a larger number denotes a better sound insulation. It can be deduced from this equation that the more relative power is transmitted, the lower the sound reduction index becomes. Note that good sound absorbing material is light, loose and porous. Do not mistake sound absorbing material for sound insulation material. The elastic liner can be chosen from felt, cork, rubber, and elastic carpet. That means to fill in elastic liner between wall and spandrel girder, as well as between the frame of the building and the wallboard. The best way to insulate the solid-borne sound is to use the unconnected structure. Therefore, it is better to choose dense and heavy material (clay brick, reinforced concrete, steel plate, etc) as sound insulating material. The greater the mass is, the harder it is to vibrate this material, thus the better the insulating property will be. The sound insulation property of wall or plate depends on its mass area ratio. The sound permeation complies with the “mass law” in acoustics. The higher the numeral is, the better the sound insulating property is.Īccording to the way of transmittance, the sound that people would like to insulate can be divided into air-borne sound (due to the vibration of the air) and solid-borne sound (due to the impact on solids or solid vibration). It is demonstrated by the sound transmission loss which is expressed by the difference of decibels between the incident sound and permeated sound. Sound insulation is a kind of measure to prevent the sound waves from permeating. Rose, Brew and D.In Building Materials in Civil Engineering, 2011 12.2.4 Sound-insulating Materials Harlem Renaissance Grand Ballroom award aka Ride Along 3 (they ain’t pullin’ rabbits out the hat on this) Rap Panther Cointelpro award (J.Edgar hoover list) The best cheatin’ song that got flipped to a monogamy love songĭead Presidents Cutty smacking Anthony down a flight of stairs award “Spittin in da wip “ (No wackness in da wip sun !)īest restaurant that’s always booked award/best album The cause of a decrease in worker productivityīest D.U.I and D.W.I with no alcohol content and best underhanded insult "How many yrs now…still no parodies, what's the deal SUN !!! Send us your thoughts at: a year that brought a lot of crap more so than usual, staged pregnancies, rehab, faked marriages, planned divorces/ break ups due to the fake marriages, heavy plastic surgery, horrendous gimmicks, half naked chicks playing themselves, arrests, fake publicity, nonsense, lack of creativity, Twitter over reaction, Instagram shaming, ill timed confessions and industry suicides, We carry on a proud tradition. Of course, there will be controversy and disagreements, but we encourage For the most part, it is to recognize some people or artist who should be. The awards are constructed on talent, skill, originality, quality, humor, the truth, thought provocation, and from time to time drunkenness or lack of sleep. ![]() However some may win due to pixism or niggerism. The Thermal Awards are not based on record sales, soundscan, billboard, payola, popularity etc. We at Thermal Soundwaves are not interested in those who were offended. Some got offended again (sensitive thugs) and a lot of people laughed. It got loads of reactions and responses as usual. Last year we held the 10th annual THERMAL AWARDS live on Thermal Soundwaves radio. ![]()
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