消声室：它有非常专业的填充物在墙壁和天花板上，还有地毯。
The Dead Room: This has major padding on the walls and ceiling, with a carpet floor.
台架实验和整车道路实验均表明，两种结构对降低后桥异响均有显著效果，车内异响噪声亦得以基本消除，且亥姆霍兹穿孔板吸声结构的效果略优于薄膜阻尼消声结构。
The results of bench test and road test show that the abnormal noise reduced greatly after the improvement and the Helmholtz resonance structure is better than the film-damping structure.
最终将微穿孔板消声器安装到新舟60飞机APU的排气管道上在飞机场进行现场测试，得到了满意的降噪结果。
At last, the test for the MA60 APU noise with the micro perforated absorber is present in this paper.
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.
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.
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