Principle of exhaust muffler

The basic principle of boiler steam muffler is to use electronic equipment to generate another sound wave with the same sound pressure and opposite phase in the original sound field, thus canceling the original sound field in a certain range. This muffler is a musical instrument device, which is mainly composed of microphone, amplifier, phase shifter, power amplifier and speaker. The air quality in the tube is equivalent to inductance and resistance, which is called acoustic quality and acoustic resistance. The volume of indoor air is equivalent to capacitance, which is called acoustic compliance. Similar to electronic filters, each battery with an electron tube has its own natural frequency. When sound waves with various frequency components enter the first short pipe, only sound waves with certain frequencies close to the natural frequency of the first mesh can reach the second short pipe through the mesh.