What is a Gun Silencer?

The so-called "silencer pistol" is also not completely silent, it just converts sound into other sounds. There are many ways to silence a pistol. The sound of the pistol mainly comes from the sub-pumping chamber. When the air rushes out of the muzzle, the shock caused by the huge pressure on the outside air. Muffler is a noise reduction device installed on the air flow channel of aerodynamic equipment (such as blowers, air compressors) or in the intake and exhaust systems. The muffler can block the propagation of sound waves and allow airflow to pass through. It is an effective tool for controlling noise.

Silenced pistol

The so-called "silencer pistol" is also not completely silent, it just converts sound into other sounds. There are many ways to silence a pistol. The sound of the pistol mainly comes from the sub-pumping chamber. When the air rushes out of the muzzle, the shock caused by the huge pressure on the outside air.

There are many types of mufflers, but they can be divided into six main types based on their muffler mechanisms, namely resistive mufflers, resistant mufflers, impedance composite mufflers, micro-plate mufflers, small-hole mufflers and active mufflers. .

The resistive muffler mainly uses porous sound absorbing materials to reduce noise. The sound-absorbing material is fixed on the inner wall of the airflow channel or arranged in a pipe in a certain manner to form a resistive muffler. When the sound wave enters the resistive muffler, a part of the sound energy rubs in the pores of the porous material and is converted into heat energy to be dissipated, which weakens the sound wave passing through the muffler. A resistive muffler is like a purely resistive circuit in electricity. The sound-absorbing material is similar to a resistor. Therefore, people call this muffler a resistive muffler. The resistive muffler has a good effect on the middle and high frequencies and has a poor effect on the low frequencies.

The resistant muffler is a combination of tubes and chambers with abrupt interfaces, which seems to be an acoustic filter, similar to electrical filters. Each small chamber with a tube is a mesh of the filter. The air quality in the tube is equivalent to electricity. The inductance and resistance are called sound quality and sound resistance. The volume of air in the cell is equivalent to the electrical capacitance and is called sound compliance. Similar to electrical filters, each cell with a tube has its own natural frequency. When sound waves containing various frequency components enter the first short tube, only certain frequency sound waves near the natural frequency of the first mesh can pass through the mesh to reach the second short tube mouth, while other frequencies Sound waves cannot pass through the mesh. It can only reflect back and forth in the small room, so we call this structure that has a filtering function for sound waves an acoustic filter. Selecting appropriate tubes and chambers to combine can filter out noise of certain frequency components, thereby achieving the purpose of noise reduction. Resistive muffler is suitable for eliminating middle and low frequency noise. The resistive structure and the resistive structure are combined in a certain way to form an impedance composite muffler.

Micro-perforated plate muffler is generally made of a pure metal sheet with a thickness of less than 1mm. The sheet is perforated with a drill with a hole diameter of less than 1mm. By selecting different perforation rates and different cavity depths for plate thickness, the spectral performance of the muffler can be controlled, so that it can obtain a good muffler effect in the required frequency range.

The structure of the small hole muffler is a straight pipe with a closed end, and many small holes are drilled in the pipe wall. The principle of the small hole muffler is based on the frequency spectrum of the jet noise. If the total area of the nozzle is kept unchanged and many small nozzles are used instead, the frequency spectrum of the jet noise will move to high frequency or High frequency makes the audible sound component in the frequency spectrum significantly reduced, thereby reducing interference and harm to people.

The basic principle of an active muffler is that in the original sound field, electronic equipment is used to generate a sound wave of the same magnitude and opposite phase as the original sound pressure, so that it cancels out the original sound field within a certain range. This muffler is a set of instruments and devices, mainly composed of a microphone, an amplifier, a phase shift device, a power amplifier and a speaker.