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.
好在这些声音是超声波频率，所以我们听不到这些声音。
The good news is that because this call has an ultrasonic frequency, we are unable to hear it.
研究表明：穿孔板的声阻与孔板厚度、孔径、穿孔数目、声波频率和气流速度等因素有关。
The experimental results show that acoustic resistance of perforated plate is related to plate thickness, aperture diameter, numbers of aperture, acoustic frequency and airflow velocity.
应用推荐