Recent content by otto

need to find out where resonating chamber(s) are. or try to close all the holes in car body structure. I don't know where the resonance occurs

in my case the resonance may disappear at any speed. The point is that the resonance may appear and disappear at any speed. this means that it is excited by outside noise - aerodynamic vortices or suspension vibrations

the noise also appears while accelerating or constant speed. regenerative system doesn't work in such cases

It's a headache noise and doesn't depend on speed

may you use spectrum analysis(like spectroid)) app to show the frequencies distribution? in my case the resonance is on 40 Hz and the cause is acoustic properties of connection(hole, pipe) inside space to outside(Helmholtz resonance)