Environmentally sound barrier acoustic sound absorption and noise reduction

Between the sound source and receiver pierce a device, so there is a clear sonic convey additional attenuation, noise and weaken the recipient must place within the region, such a device is called the environmental sound-absorbing acoustic noise reduction barriers acoustic effects to convey the process, when you encounter the sound barrier, it will attack the reflection, transmission and diffraction in three appearances. Typically we thought to obstruct the direct sound barrier can convey, and that satisfies the transmission acoustic attenuation, while transmitting acoustic influence can be neglected. Thus, sound effects sound barrier usually indicate the amount of noise reduction can be used, which reflects the sound through the sound barrier to shield the two skills. Between the sound source and the receiving point pierce a sound barrier, set up a barrier of infinite length, only acoustic diffraction barrier in the past from the top, but in the subsequent constitute an acoustic shadow zone, as the light is obscured objects that constitute a shadow. In this acoustic shadow zone, we can feel the noise significantly weakened, it is the noise reduction effect that sound barrier. Outdoor sound barrier structure is usually used brick or concrete structures, interior sound barrier cited steel, wood,, PMMA / POLYCARBONATE SHEET pull plastic, gypsum board and foam aluminum structure. The primary sound barrier consists of two columns and steel structure suck insulation panel composed, column is the primary force component of the sound barrier, it is fixed through bolts or welding anti-wall or on the road side of the embedded steel rails; absorbing insulation board member is the primary acoustic absorption, it passes through high-strength spring clamp to secure it in the H-type column groove constitute the sound barrier. Sound barrier has been more adequately planning thinking carom elevated high-speed road safety, urban light rail, subway wind load, transport vehicles and all-weather outdoor corrosion problems. It is elegant appearance, beautifully produced, transported, convenient device, low cost, long life use, especially for the high-speed road and urban elevated light rail, subway use anti-noise, is the ideal modern city noise reduction equipment. Sound barrier height 5m 1m a room, conceal useful regional average noise up to 10 ~ 15dB (A) (125Hz ~ 40000Hz, 1/3-octave) and up to 20dB (A). Generally, the higher the sound barrier, or farther away from the sound barrier, noise better. 3 Series introduces sound barrier aluminum fiber cotton series of constant underlying sound barrier aluminum fiber cotton Specifications: 30mm thick noise reduction coefficient NRC = 0.85 absorbing sound barrier sound barrier Rockwool Rockwool Series Features an adiabatic function: Rockwool insulation function well is finished The fundamental characteristics, (25 ℃ or so) at room temperature, the thermal conductivity of rock wool condition is usually 0.03 ~ 0.047W / (moK) between. 2, burning function: rock wool, slag wool finished burning function depends on how much the meantime flammable adhesive. Rockwool mineral fiber itself belongs inorganic, non-combustible, in the course of processing into the finished product, sometimes attend organic binder or additive, these features of the finished product will certainly influence the burning occurs. 3, soundproofing: Rockwool finished with excellent sound insulation and sound absorption features, its sound absorption mechanism of this is finished with a porous structure, when the sound waves through the period, because of the effect of the flow resistance of conflict, so that part of the sound energy of fiber absorbed, overcast hinder the transfer of sound waves.