XJP 吸聲尖劈 　　

XJP吸聲尖劈主要適用于在室內建立自由聲場的消聲室內，因為這類專用實驗室要求室內各界面均具有接近100％的聲吸收。通常把吸聲系數達α=0.99的最低頻率稱吸聲尖劈的截止頻率，因為這時室內在較大范圍內能滿足自由聲場的條件。 　　

XJP吸聲尖劈的構造是選用一定粗細的鋼筋制成符合設計形狀尺寸的框架，框架上縫護面，在框內均勻地填充多孔吸聲材料。 　　

XJP吸聲尖劈的吸聲原理為當聲波從尖端入射時，由于吸聲層的逐漸過渡性質，材料的聲阻抗與空氣的聲阻抗能較好地匹配，使聲波傳入吸聲體，并被高效地吸收。 　　

吸聲尖劈由尖部、基部和空腔三部分組成，它的吸聲特性與尖劈的長度、尖部與基部長度之比，尖劈與剛性面間的空腔，以及材料密度等參數有關。尖劈愈長，低頻吸聲性能愈好。

產品性能 　　

XJP 吸聲尖劈最低截止頻率吸聲系數大于 0.99 。本公司是建設部消聲室工程技術規范參編企業。

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.