平方余数序列扩散体于声屏障的应用

传统屏顶吸声体采用的棉状吸声物料存在着比重高,防水性能差,降噪能力不理想等缺点。平方余数序列扩散体基于共振原理消声,不但大大改善了以上传统屏顶吸声体的缺点,更可以通过设计,为指定的音频范围降噪。本文将介绍二款(T型及六角型)专门为减低交通噪声而研发的屏顶平方余数序列扩散体,它们的有效降噪范围从400Hz到2500Hz。T型及六角型扩散体的初步测试结果显示在低中频的插入损失有6至7.5分贝。

Square Remainder Series'Application in Sound Barrier

Traditional screen-like sound-absorbing material is adopted in the top of absorbers,it has the disadvantages of high proportion , poor water resistance, not ideal noise reduction capability. Quadratic residue sequence based on the theory of resonance, not only greatly improves defects of traditional screen top absorber, but also reduces the specified range of audio noise by design . This article will introduce two models（T-type and hexagon-type） specifically developed to reduce traffic noise and screen the top quadratic residue sequence diffusers, their effective noise reduction ranges from 400Hz to 2500Hz. The preliminary test on the Proliferation of T-and hexagonal body shows that the insertion loss is 6 to 7.5 dbin the low-IF.