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.
For XJP sound absorbing cut, its lowest frequency sound absorbing index is bigger than 0.99.