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小孔消声器是利用气流以相同的流量向相同的环境条件排放 ,其排放的喷口直径愈小 ,喷注的噪声频率愈高这一声学特性 ,将人耳听觉最敏感的 1 0 0 0～ 2 0 0 0Hz附近的一个噪音“鸵峰” ,移至可听声之外 ,达到降噪的目的。其孔径越小 ,喷注速度越高 ,噪声的频率越高 ;安装在排气管道上的小孔消声器 ,要反复承受热应力、内应力和瞬态力的作用。因此 ,小孔消声器应有足够的强度 ,否则会发生破裂事故。
Small hole muffler is the use of air flow at the same flow to the same environmental conditions, the discharge orifice diameter is smaller, the higher the noise frequency of the injection of this acoustic characteristics of human hearing most sensitive to 100 ~ 2 A noise “Ostrich” near 0 0 Hz moves to an audible noise for the purpose of noise reduction. The smaller the aperture, the higher the injection speed, the higher the frequency of noise. The small hole muffler mounted on the exhaust pipe should repeatedly withstand the effects of thermal stress, internal stress and transient force. Therefore, the orifice muffler should have sufficient strength, otherwise it will happen rupture.