Helmholtz resonance maximum noise characteristics is that its frequency has nothing to do with the engine speed, but it must be noted that the resonance frequency of the cylinder with the volume of work and change, such as exhaust with the piston up the process, the resonant frequency gradually incr

Helms hodes resonance noise of the biggest feature is that its frequency with engine speed, but it must be noted that resonance frequency with cylinder working volume changes, such as exhaust in the course of the piston with uplink, resonant frequency is gradually increasing. Therefore, the noise sp

When the engine exhaust gate opens, the air cylinder and the exhaust passage, the exhaust pipe compose a Helmholtz wave resonant cavity, it has a resonance frequency.The waste gas flowing stimulates in the noise obtains the full enlargement with the resonance frequency consistent frequency ingredien

Helmholtz resonance noise of the biggest feature is that the frequency is independent of engine speed, but care must be taken, the resonance frequency change with working volume of the cylinder, and, for example exhaust process as the piston upward, rising resonance frequency. So corresponds to the

Helmholtz resonance noise of the biggest feature is that the frequency is independent of engine speed, but care must be taken, the resonance frequency change with working volume of the cylinder, and, for example exhaust process as the piston upward, rising resonance frequency. Therefore, noise frequ