采用驻波管法测试材料的吸声系数。
The sound absorption coefficient of the material was tested by standing wave tube method.
而制品的吸声系数仅为0 . 115。
采用驻波管法测量了多种粮食的吸声系数。
Methods Use a standing wave tube to measure the sound absorption coefficient of many kinds of grain.
更以吸声系数的频率曲线以进行详细比较。
Absorption curves were drawn for different load resistances, of absorption coefficients versus frequency.
当声波频率增加时，多孔铝合金的吸声系数增大。
When sound frequency increases, the sound absorbent coefficient of porous aluminum alloy increases.
当声波频率增加时，多孔铝合金的吸声系数增大。
It was found that the porous aluminum alloy has peat sound absorbent coefficient.
结果表明材料的平均吸声系数和降噪系数分别达0。
The result shows that average absorption coefficient and noise reduction coefficient separately equal to 0.
此种尖劈的突出特点是在高压下仍保持高的吸声系数。
The characteristics of the wedge is that the high sound-absorption coefficient remains under the high water pressure.
试验结果表明，石墨改变了涂层的密度，提高了涂层的吸声系数。
It found that the graphite changed the density of the coating, and improved the sound-absorption coefficient of the coating.
结果表明，随着温度的升高，吸声系数不再随频率的升高而增大。
The results indicated that with the increase of the frequency, absorption coefficient did not increase.
孔隙率，面密度，厚度，流阻，结构因数因素综合影响其吸声系数。
Porosity, surface density, thickness, flow resistance, structure factor and other factors affect the sound absorption coefficient.
另外降低多孔铝合金的孔隙尺寸和增加其孔隙率，均会使多孔铝合金的吸声系数增大。
In addition the porosity of porous aluminum increasing or pore size decreasing, the sound absorbing coefficient also increases.
对尖劈型吸声材料用类比变截面管道的声场理论，给出了计算其吸声系数的一种方法；
The theoretical method for calculating the absorption coefficient of the absorber is provided by analogying the acoustic field in a tube with varying cross section.
铝硅闭孔泡沫铝的孔隙率和厚度对其吸声性能影响显著：吸声系数随孔隙率增加而增加；
The porosity and thickness affect markedly on the sound absorption property of Al-Si closed-cell aluminum foam: the sound absorption coefficient increases along with increasing porosity;
文中给出了一种计算该吸声器的吸声系数的方法，并对吸声系数与频率的关系进行计算机仿真。
The theoretical method for calculating the absorption coefficient of the absorber is provided and the relationship between the absorption coefficient and frequencies is given by computer simulation.
利用蒸馏水标校测量系统等效的吸声系数，采用已知浓度的硫酸镁溶液来标校测量系统的测量精度。
The equivalent sound absorption coefficient of the system can be calibrated by the distilled water. The accuracy of the system can be gotten by the magnesium sulfate solutions of known concentration.
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。
The result shows that average absorption coefficient and noise reduction coefficient separately equal to0.58and0.60 and fine property of sound absorption at middle-low frequency.
随着孔隙率、孔径的减小，多孔铝的共振吸声系数有所下降，吸声频谱曲线向低频方向移动，且频带宽度展宽。
When the porosity and pore diameter reduced, the sound absorption curve moved to the low frequency zone and the frequency bandwidth increased at the same time.
混响室是声学专业的实验室用房，它在测量声波无规入射时材料的吸声系数和测量噪声源的声功率级中得到了广泛应用。
In the measurement of sound absorption coefficient in random incidence and determination of sound power levels of noise sources, the reverberation room is used very extensively.
利用PVC、NBR、无机物等制成了一种吸声材料，该吸声材料具有低频吸声系数高、成型加工简单、成本低等优点。
The new sound-absorbing material made from PVC, NBR and other inorganic compounds was studied. This material has good sound-absorbing properties in the low frequency.
隧道型公共设施的声环境，可以使用大量具有高吸声系数的吸声构造，铺设于隧道拱壁及轨道铺面，以降低混响时间及噪声。
The reverberation time and noise level of tunnel-typed public works can be reduced by adding large amount of acoustical structure with high absorptive coefficient.
仿真结果表明：带有空腔的尖劈吸声器相对普通尖劈吸声器，除保持高频段较好吸收性能外，在低频段吸声系数有显著提高；
The results showed that the absorption performance of this kind of absorber is better than normal wedge absorbers in low frequency and it keeps good absorbing performance in high frequency.
而通过几个参数的适当搭配，槽孔板与木丝板复合结构的平均吸声系数分别由0.409，0.306最高可提高到0.868，0.862。
The average absorption coefficient of the composite structures made by partt board and wooden fiberboard can increase up to 0.868, 0.862 from 0.409, 0.306.
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 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.
具有质轻、导热系数小、吸声性能好、不燃、化学稳定性好等特点。
With light, small coefficient of thermal conductivity, sound absorption performance is good, not burning, the chemical stability is good wait for a characteristic.
因此，吸声材料声反射系数的测量受到越来越多的关注。
Then, the reflection coefficients measurement is also being paid more attention to.
研究表明，随着气流马赫数的增加，吸声结构的消声系数明显下降，微穿孔板的非线性声阻和声质量修正值都略有减少。更需注意，在高速流条件下吸声结构的共振峰将会发生偏移。
It is shown that the attenuation coefficient will decrease obviously with the increase of Mach number, and the nonlinear acoustic resistance and acoustic mass will reduce slightly.
具有质轻、导热系数小、吸声能好、不燃、化学稳定好等特点。
With light, small coefficient of thermal conductivity, sound-absorbing performance is good, non-flammable, chemical stability is good wait for a characteristic.
具有质轻、导热系数小、吸声能好、不燃、化学稳定好等特点。
With light, small coefficient of thermal conductivity, sound-absorbing performance is good, non-flammable, chemical stability is good wait for a characteristic.
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