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The structure of microporous plate muffler is similar to that of resistive muffler. According to the shape of the airflow passage of the micro perforated plate muffler, different structure forms of the automobile exhaust muffler, such as chip type, plate type, diamond type and sine wave type, can be made. Sound elimination principle: the micro perforated plate muffler is based on the sound absorption structure of the micro perforated plate. A large number of micropores less than 1 mm are put on the thin metal plate, bakelite plate and plastic plate below 1 mm, and the center distance of the selected holes is 5 ~ 8 times of the aperture. The plate is fixed in front of the steel plate, and a 10-24mm cavity is left behind the plate as the sound-absorbing structure of the microplate. For the sound elimination principle of the microporous plate muffler, the first is that the small void diameter can improve the sound absorption system, the second is that the low void ratio can increase the width of the sound absorption band, and the third is that the depth behind the plate can improve the position of the resonance absorption peak.

The reason why small aperture can improve the sound absorption system is that the energy loss of sound wave depends on the friction loss of air in the micropore. The friction loss depends on the sound resistance of the sound absorption structure. The greater the sound resistance is, the greater the friction loss is. The sound resistance is inversely proportional to the square of the aperture. As the pore diameter of the microplate is reduced to less than 1 mm, the acoustic resistance of the microplate is greatly increased compared with that of the ordinary orifice plate (from several millimeters to more than ten millimeters), and the sound absorption system is improved.