noise attenuation device for the reduction of mouth noises in the case of installations having a pulsating gas streams

摘要

the geru00e4uschdu00e4mpfungsvorrichtung to reduce mu00fcndungsgeru00e4uschen installations with pulsating gasstru00f6mungen has a frequency measuring device (36) on the pulsationsfrequenz gas flow in a gasstru00f6mungskanal (14) measures. the gasstru00f6mungskanal (14) with a helmholtz resonator (42) connected, the parameters of mass and / or feather - at least one changed.the frequency measuring device (36), a control unit (38), a control (40) to change the helmholtzresonators (42) direction.the control of the helmholtzresonators (42) is such that the length and / or the cross-section of the neck (otherwise 46) and / or the volume of the helmholtzresonators (42) is inversely proportional to the gas flow pulsationsfrequenz continuously be updated, on the ges 80% of the plant.