吸声材料

• Finally , the future of noise active control is proposed , that is design theory and method of sound interdict strap , active sound absorption and research of new absorption material
  最后，提出噪声控制工程的未来发展方向，即：声学禁带设计理论与方法，主动吸声，新型吸声材料的研究。
• This article mainly concern the sound material in the engine compartment of a passenger car , and obtain that the old material which can not satisfy the need have to be replaced
  摘要通过测量分析发动机舱内噪声频谱特性，对某型客车发动机舱的原用吸声材料进行测量，并得出了原有材料选用不适当的结论。
• The system makes use of the connecton of gypsum board and ceiling suspension , and forms cavity ( or fills with sound - absorbing material ) . that can well solve the promble about insulation of heat and sound , etc
  石膏板隔墙系统利用石膏板和龙骨连接，形成空腔（或填充吸声材料） ，能很好地解决隔热、隔音等问题。
• Patt perforated panel is a kind of product which the small holes are on visible side and the big holes are on the rear , their core materials are medium density fiberboard ( mdf ) , they can be used for wall and ceiling finish
  "帕特"孔木吸声板是一种在中密度纤维板的正面、背面开圆孔的结构吸声材料，常用于墙面和天花装饰。
• Patt perforated panel is a kind of product which the small holes are on visible side and the big holes are on the rear , their core materials are medium density fiberboard （ mdf ） , they can be used for wall and ceiling finish
  "帕特"孔木吸声板是一种在中密度纤维板的正面、背面开圆孔的结构吸声材料，常用于墙面和天花装饰。
• These are not really loads but indicate surfaces that absorb sound . specify the degree of sound absorption as the material property mu ( boundary admittance or absorption coefficient )
  也就是说它的作用是使得边界吸声材料的吸声特性得以发挥。如果是0 ，就是不发生吸声现象。相反，是1 ，就是说明是吸声材料的吸声特性完全发挥。
• Patt crooved panel is a kind of product which the grooves are on visible side and the round holes are on the rear , their core materials are medium density fiberboard ( mdf ) , they can be used for wall and ceiling finish
  "帕特"槽木吸声板是一种在中密度纤维板的正面开槽、背面开圆孔的狭缝共振吸声材料，常用于墙面和天花装饰。
• Design options include selecting and confirming the type and volume , the best reverberation time and frequency response characteristic , layouting the acoustic materials and designing appropriate reflectors to organize the reflection rationally
  设计内容包括体型和容积的选择,最佳混响时间及其频率特性的选择和确定,吸声材料的组合布置和设计适当的反射面,以合理地组织反射声等。
• In the last , a experiment is carried out , the experiment result denotes that the absorption effect is smart in middle and low frequent and imperfect in high frequent for passive absorption is reigning
  最后进行了实验，实验结果表明了在中低频平面声波入射时，采用本方法的吸声效果改进比较明显，但在高频平面声波入射时，采用本方法的吸声效果就不是很明显，此时吸声主要是依靠吸声材料被动吸声。