吸声尖劈

XJP 吸声尖劈 　　

XJP吸声尖劈主要适用于在室内建立自由声场的消声室内，因为这类专用实验室要求室内各界面均具有接近100％的声吸收。通常把吸声系数达α=0.99的最低频率称吸声尖劈的截止频率，因为这时室内在较大范围内能满足自由声场的条件。 　　

XJP吸声尖劈的构造是选用一定粗细的钢筋制成符合设计形状尺寸的框架，框架上缝护面，在框内均匀地填充多孔吸声材料。 　　

XJP吸声尖劈的吸声原理为当声波从尖端入射时，由于吸声层的逐渐过渡性质，材料的声阻抗与空气的声阻抗能较好地匹配，使声波传入吸声体，并被高效地吸收。 　　

吸声尖劈由尖部、基部和空腔三部分组成，它的吸声特性与尖劈的长度、尖部与基部长度之比，尖劈与刚性面间的空腔，以及材料密度等参数有关。尖劈愈长，低频吸声性能愈好。

产品性能 　　

XJP 吸声尖劈最低截止频率吸声系数大于 0.99 。本公司是建设部消声室工程技术规范参编企业。

XJP sound absorbing cut
XJP sound absorbing cut mainly used in dead room building free sound field within room, since such kind of special laboratory requires all surface have a 100% or near the number sound absorption. Usually sound absorption index at α =0.99—the lowest frequency is called cutoff frequency, when bigger range within room can meet the condition for free sound field.
XJP sound absorbing cut is made of certain diameter reinforcing steel bar which matches design shape frame, on such frame sews surface protection material, while in such frame fills with multi-whole sound absorbing material on average.
The sound absorbing principle of XJP is that when sound wave is ejected into sound absorbing cut from tip, since the gradual transition of sound absorbing layer which make acoustic impedance of material and of air match well to be transmitted into sound absorbent and be absorbed high efficiently.
Sound absorbing cut consists of three parts, named tip, base and cavity. Its sound absorbing characteristics is relevant to some parameters such as the length of the cut, the length proportion between cut and base, cavern between the cut and flexible surface and material density. Longer the cut is, better low frequency sound absorbing function is.
product performance
For XJP sound absorbing cut, its lowest frequency sound absorbing index is bigger than 0.99.