Hohlraumresonator

摘要

In a cavity resonator 402 having a variable resonance frequency, a constantly high sound-absorbing effect is achieved over the entire resonance adjustment range by also simultaneously adjusting, with the length, the cross-sectional area of the resonator neck 408 in accordance with an appropriately selected resonance/flow impedance relationship and, additionally, compensating the selfdamping of the resonator, for example with the aid of a heating device 432 arranged in the resonator neck 408.