The basic principle of the boiler steam muffler is to use electronic equipment to generate a sound wave equal to the original sound pressure and opposite in phase in the original sound field, so that it is consistent with the original sound field within a certain range. offset. This kind of muffler is a set of instruments, mainly composed of microphones, amplifiers, phase shift devices, power amplifiers and speakers. The air mass in the tube is equivalent to the electrical inductance and resistance, which are called sound mass and sound resistance. The volume of air in the chamber is equivalent to the electrical capacitance, which is called acoustic compliance. Similar to electrical filters, each chamber with tubes has its own natural frequency. When sound waves containing various frequency components enter the first short tube, only sound waves with certain frequencies near the natural frequency of the first mesh can pass through the mesh and reach the second short tube opening.