1. The working principle of the silencer is: in the original sound field, electronic equipment is used to generate a sound wave with the same sound pressure and opposite phase, so that it can compensate for the sound field of origin within a certain range. . This silencer is a set of instruments, mainly composed of a microphone, an amplifier, a phase shifter, a power amplifier and a speaker.
2. A silencer ((silencer)) is a device that prevents the propagation of sound and allows air flow to pass through. This is an important measure to eliminate aerodynamic noise. Muffler is a noise reduction device installed in the air duct of aerodynamic equipment (such as fans, air compressors, boiler exhaust, generators, water pumps and other equipment producing loud exhaust noise) or in AD systemsmission and escape.
3. Porous sound-absorbing materials are mainly used to reduce noise. The sound-absorbing material is attached to the inner wall of the air flow channel or arranged in a certain way in the pipe to form a resistive silencer. When sound waves enter the resistive silencer, part of the sound energy is rubbed into the pores of the porous material and converted into thermal energy dissipation, which weakens the sound waves passing through the silencer. A resistive silencer electrically resembles a purely resistive circuit and the sound deadening material is similar to a resistor. Therefore, people call this type of silencer a resistive silencer.
Engine exhaust noise is very high, so noise reduction treatment is necessary before adding a muffler to the exhaust pipe.
Industrial silencers are 10 decibels, and there are othersres around 20 decibels, and those even higher exceed 35 decibels.
The purpose of using a secondary silencer is also to reduce noise and meet environmental protection requirements. The bottom line is that even if a silencer is used, it cannot exceed the allowable exhaust back pressure of the engine, otherwise it will affect the operation of the engine.