Sound absorption practices elevator divided into three categories: one, the elevator itself acoustic damping treatment, reach the purpose of reducing or eliminating noise, which is a method to deal with from the source. Such as elevator hoistway track transformation, use the mute king high vibration damping insulation blankets spread retrofit insulation pad; the other is a mounting rail vibration and noise reduction devices to reduce sound transmission structural wells. The latter approach high cost, especially when you have been in the elevator used to transform not only the need to remove the elevator-related components, the construction process more complicated and expensive. So, for the adoption of the usual procedure is to use the elevator noise deadening damping mute king - the sound barrier mat. Second, take environmental protection and efficient full-frequency sound absorption mute noise absorbing material between the king of the elevator shaft and additional sound insulation room wall way related gradient acoustic material absorbing cotton, polyester fiber acoustic panels. This approach included in the Atlas "building sound insulation and sound-absorbing structure" (08J931) in. This approach to the space elevator hoistway less affected, but also on the elevator without any impediment, security is good. Third, is the inner wall of the elevator shaft acoustic treatment, such as increased noise cotton in the hoistway. Current conventional practice in the inner wall of the hoistway paving soundproofing materials (such as environmental protection and efficient, fire retardant high-grade polyester fiber cotton insulation mute King), external protective measures do. For example: Practice 1: the inner wall of the elevator shaft wall grassroots + mute king cotton insulation (60cm intervals along the wall of wood keel nail 4cm╳4cm height direction) + nails on the wooden keel steel mesh + cement mortar surface. This approach has a certain sound absorption effect, but there are certain problems in the construction, especially for cotton insulation paving the practice, because in cotton insulation, the outer steel mesh concrete and mortar, cement mortar adhesion is poor, easy to crack, loss, poor durability. Practice 2: the inner wall of the elevator shaft nailing Wall base + 3cm cotton insulation + outer layer of steel wire nails + 2cm thick cement mortar surface. This approach is better with respect to the practice of one, because cement mortar in the wire bonding can better online. From the United States to introduce the mute king efficient full-frequency sound-absorbing material there is a good anti-vibration performance, fire (B1 grade), water resistance, thermal insulation, moisture resistance, resistance to freezing and thawing, low cost, pollution and other properties. Durability mute King absorbing layer is better, the adverse effects of the use of acoustic phenomena affect not found. After testing, 5cm thick sound-absorbing cotton gradient test results, a comprehensive noise reduction coefficient NRC≥0.9. Currently, the polyester fiber sound-absorbing materials are widely used in the subway, train stations, tunnels and other vibration and wind erosion of the roof, side walls and rails on both sides of the sound absorption, but also for acoustic insulation of the elevator shaft and the shaft of the device. 

keywords: Elevator shaft noise, elevator noise, acoustic methods elevator,