目的是了解微穿孔板在随机入射场或混响场内的吸声特性与垂直入射的关系。
The purpose is to compare and to find the relation of normal and random incidence.
车身多层阻尼结构的振动特性及隔吸声特性是影响车室空腔声响应的重要因素。
Vibration characteristics and sound insulation capability of multilayer damping panels are very important factors which dominate acoustic response in the interior of automobile bodies.
离心玻璃棉的吸声特性不但与厚度和容重有关，也与罩面材料、结构构造等因素有关。
Centrifugal glass cotton absorption characteristics not only and thickness and density of related, also and cover face materials, structural factors.
介绍了泡沫铝的吸声特性，研究了泡沫铝的厚度、孔隙率、压缩率、空腔对其吸声性能的影响。
The sound absorption properties of foamed aluminum are introduced and the effects of thickness, porosity, compression ratio, air cavity depths on sound absorption property are studied.
本文的研究揭示了金属橡胶材料的吸声降噪性能，对金属橡胶材料吸声特性进行了深入的理论和试验研究。
This dissertation does deep research in sound absorption performance of MR from theory and experiment aspects and indicates the sound absorption and noise reduction property of MR.
合成纤维及其制品(无纺布，纺织品，地毯等)既是高档装饰材料，作为多孔性材料又具有优良的吸声特性。
The product made of synthetic fiber such as nonwoven web, fabric and carpet as a good porous material will be used in buildings as both ornament and sound absorption material.
吸声材料的吸声特性及其在室内的位置布置是室内声学研究的一个非常重要的部分，目前多是在实验室中进行测量研究。
The absorption properties of sound-absorbing material and its location in the room is a very important part of room acoustics study. The study methods are measured in the laboratory.
结果表明，不同背衬对吸声覆盖层吸声性能的影响具有明显不同的特性。
The results show that the influences of various backings on the acoustic characteristics of anechoic coating are obviously different.
吸声与隔声是材料的声学特性，吸声与隔声测量对噪声控制与声学设计具有重要意义。
Sound absorption and insulation is the acoustical characteristic of material. Measurement of sound absorption and insulation has an important significance in noise control and acoustical design.
对穿孔板吸声结构的声学特性进行了理论分析与计算。
Theoretical analysis and calculation on the acoustic properties of perforated panel absorber were described herein.
介绍了聚氨酯材料的水声特性，并重点评述了聚氨酯水声吸声材料、水声透声材料和水声反声材料的研究进展。
The underwater acoustic properties of polyurethanes were introduced. The recent research progress of underwater acoustic materials of polyurethanes was reviewed.
本文还研究了带空腔的吸声覆盖层在各种背衬和不同腔型下的声反射特性，分析了结构对其的影响。
The acoustic reflection characteristics of the underwater anechoic coating with cavity are researched in different backings and cavity types, and effects of structure are also analyzed.
结合近年来水下目标吸声材料和结构的应用及研究，从材料声学设计的角度，讨论了水下吸声材料的声学特性和研究进展。
In this paper, research of acoustic characteristics and developments of underwater sound-absorbing material are surveyed in view of material acoustics.
数值分析了水声吸声覆盖层的声反射特性。
The acoustic reflection characteristics of the underwater anechoic coating are numerical analyzed.
文中给出计算及测量结果，并说明了影响微穿孔板吸声结构特性的因素，以及在实际应用中的注意点。
The results of calculation and measurement are presented, and some factors which affect the characteristics of MPA are given in the paper.
文中给出计算及测量结果，并说明了影响微穿孔板吸声结构特性的因素，以及在实际应用中的注意点。
The results of calculation and measurement are presented, and some factors which affect the characteristics of MPA are given in the paper.
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