The effect of different vermiculite contents on mecanical , damping and sound - absorption properties of rubber sound - absorption structures was introduced 摘要就不同蛭石粉含量对橡胶吸声件的力学性能、阻尼性能及吸声性能的影响进行了研究。
The result shows that average absorption coefficient and noise reduction coefficient separately equal to 0 . 58 and 0 . 60 , and fine property of sound absorption at middle - low frequency 结果表明材料的平均吸声系数和降噪系数分别达0 . 58和0 . 60 ，且材料的中低频吸声性能优良。
Effects of the content of fiber , vesicant , pore ratio and pore diameter were investigated , the results indicates the variables have great effects on the sound absorbing performance of the samples 实验发现，孔隙率、平均孔径大小、玻璃纤维含量、发气剂含量对材料吸声性能有显著影响。
The kernel in spheroid has a smaller sound absorption coefficient than in non - spheroid . the thickness of grain sample is an important factor effecting on the sound absorption coefficient 粮食厚度也是影响其吸声性能的一个重要因素，粮食厚度增加，吸收频带加宽，低频吸声系数增大，最大吸收峰个数增加，并向低频方向移动。
The sound absorption coefficiet of osb was tested by the stationary wave method . the results showed that the osb had good sound absorption property compared with brick and concrete 采用驻波管法测定定向结构刨花板的吸声系数，分析比较了定向结构刨花板与砖、混凝土吸声性能的差异。结果表明，定向结构刨花板具有良好的吸声性能。
The authors use the specific acoustic impedance of mpp which needs to be measured beforehand in the approach , and then , the transfer matrix method is employed to predict the sound - absorbing performance of single or multi - layered mpp 采用该方法获得的微孔板吸声性能曲线与实测结果相当接近，能较好地预测各种组合微孔板的吸声性能。
To provide a method that can be used to predict single or multi - layered microperforated panel ( mpp ) performance precisely , especially when the mpp has holes of different diameter and irregular shape 摘要提出用实验测得含不同孔径孔的微孔板声阻抗率来预测由其形成的单层或多层微孔板的吸声特性，并用传递矩阵法来预测该微孔板的各种组合结构的整体吸声性能。
It includes architecture acoustic design , which introduces the acoustic absorption performance , specialty and applying techniques of several kind of acoustic absorption material , and electroacoustic design , which introduce how to select , disposing , collocation electronic reinforcement systems 建声设计详细地分析了几种吸声结构的吸声原理和吸声性能，阐述了如何利用有限的材料和空间获得最理想的声场效果。
The material parameters are primaryly optimized . based on the analytical models of underwater anechoic coatings and the simulation research , the absorptive characteristics of some structures are analysed . some advice are provided on improving absorptive characteristic of anechoic coatings , and enhancing submarine ' s concealing ability 根据水下消声覆盖层解析模型理论和大量的仿真研究，本文分析了消声层一些结构声学参数的吸声特性，提出了一些改进消声层吸声性能，提高潜艇声隐身性能的建议。
This text elaborated to the function index sign , category and its function characteristics of the sound - absorbing material , and according to sound - absorbing mechanism , combined the actual engineer applying , analyzed influence factor of sound - absorbing function for the sound - absorbing material , thus to put forward the theories basis for develop new sound - absorbing material 摘要阐述了吸声材料的性能指标、种类及其性能特点，并根据吸声材料的吸声机理，结合工程实际，具体分析了影响吸声材料吸声性能的因素，从而为开发新型吸声材料提出理论依据。
