CAS-QW 隔声墙 - 一种阻抗复合式隔声墙 CAS-QW Sound Insulation Wall
硕屋科技的降噪材料已在工业降噪领域经受了考验（如CAS-AP铝镁质防火阻尼隔声毡在厂房车间隔音的应用），近来硕屋结合自家已有降噪材料的声学特性，设计了实用的隔声墙结构，并利用隔声室对其隔声性能进行了实验室测定，可以简化降噪工程中的隔声设计及施工。
The noise reduction materials of Shuowu Technology have been tested in the field of industrial noise reduction (for example, the application of CAS-AP aluminum magnesium fireproof damping sound insulation felt in the sound insulation of workshops). Recently, Shuowu has designed a practical sound insulation wall structure based on the acoustic characteristics of its existing noise reduction materials. Its sound insulation performance has been tested in the laboratory by using the sound insulation room, It can simplify the sound insulation design and construction in noise reduction engineering.
01 | 阻抗复合是说什么？What is impedance compound?
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阻抗复合其实是说吸声、消声处理中的多孔材料与穿孔空腔结构搭配，CAS-QW系列的隔声墙就是在阻抗复合方法的基础上，增添阻尼隔声毡材，进一步提升隔声性能，可在抑制混响噪声的同时又能有效隔声的工业噪声隔墙结构。
In fact, impedance compound means that the porous materials in sound absorption and silencing process are matched with the perforated cavity structure. CAS-QW series sound insulation wall is an industrial noise partition structure that adds damping sound insulation felt on the basis of impedance composite method to further improve sound insulation performance, which can suppress reverberation noise and effectively insulate sound at the same time.
02 | CAS-QW 结构优势 Structural advantages
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常见砖混墙体（120mm）、双层石膏板轻质隔墙计权隔声量一般可达40dB，为什么不将其作为工业降噪墙体？
The common brick concrete wall (120mm) and double-layer gypsum board light partition generally have a weighted sound insulation capacity of 40dB. Why not use it as an industrial noise reduction wall?
一是因为工业噪声本身具有持续产生、声压级高的特点；二是因为砖混墙体、轻质隔墙等以“增加质量”、“质量-弹簧-质量” 原理为基础的隔声结构组成狭小隔声房或隔声罩时，内部空间会因声波在壁面间的反射形成混响声场，甚至产生驻波，使噪声大幅增强。传统的设备降噪方法一般是独设设备房（有效隔声），房间内部再进行吸声处理（降低室内回声），但不免会存在这样的问题：砖混结构笨重且成本高，夹芯板结构又常常隔声性能不足。
Firstly, industrial noise itself has the characteristics of continuous generation and high sound pressure level; Second, when the sound insulation structures such as brick concrete wall and light partition wall based on the principle of "increasing mass" and "mass spring mass" constitute a narrow sound insulation room or enclosure, the internal space will form a reverberation sound field due to the reflection of sound waves between the walls, and even produce standing waves, which will greatly enhance the noise. The traditional equipment noise reduction method is to set up a separate equipment room (effective sound insulation), and then carry out sound absorption treatment inside the room (reduce the indoor echo), but there will inevitably be such problems: the brick concrete structure is bulky and high cost, and the sandwich panel structure often has insufficient sound insulation performance.
墙体内侧为透声的薄穿孔板，空气声几乎无反射地进入多孔吸声材料内，经多孔吸声材料吸收耗散、隔声毡材阻尼隔声，声能巨幅地衰减，不再次生混响、驻波噪声；外侧的金属板与龙骨之间也由较薄的吸声毡（图中的CAS-AX）隔振，降低了外侧面振动声辐射。该结构真正将吸声隔声有机结合，轻便实用。
The inner side of the wall is a thin perforated plate, the air sound enters into the porous sound-absorbing material almost with no reflection, through the porous sound-absorbing material absorption and dissipation, sound insulation felt damping sound insulation, sound energy greatly attenuated, no longer secondary reverberation, standing wave noise. A thin sound-absorbing felt (CAS-AX in the picture) is also used to isolate the vibration between the outer metal plate and the keel, which reduces the vibration and sound radiation of the outer side. The structure combines sound absorption and sound insulation, which is light and practical.
03 | CAS-QW 隔声性能 Sound insulation performance
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CAS-QW隔声墙的隔声量曲线 Sound insulation curve of sound insulation wall：
CAS-QW1隔声量曲线（结构中吸声层密度60kg/m3）
CAS-QW2隔声量曲线（结构中吸声层密度80kg/m3）
对于仅填充吸声材料的传统隔声构件，隔声量曲线近似为一条上扬的斜线，而CAS-QW隔声墙在 500Hz 频带附近的隔声量就高达40dB，使得曲线的高隔声量频带十分宽广，分析认为是CAS-AP隔声毡很好地补足了中低频带隔声量。更宽的高隔声量频带，也就表明可处理成分更复杂的噪声。
For the traditional sound insulation components only filled with sound-absorbing materials, the sound insulation curve is approximately an upward oblique line, while the sound insulation of CAS-QW sound insulation wall is as high as 40dB near 500Hz frequency band, which makes the high sound insulation frequency band of the curve very wide. The analysis shows that the CAS_AP sound insulation felt is a good complement to the sound insulation of medium and low frequency bands. The wider frequency band of high sound isolation means that it can deal with the noise with more complex components.
