Wind Noise through Windshield
Wind Noise through Windshield
(OP)
Hi Guys,
Im trying to model a part of the windshield in an impedance tube to check the noise reduction across it. When I model it in ANSYS, the noise reduction seems to change with the area of cross section. But in reality, no matter what the area of cross section is, the noise reduction should be the same at one particular frequency right?
Can anyone tell me what I am doing fundamentally wrong?
Any help would be appreciated
Thanks!
Im trying to model a part of the windshield in an impedance tube to check the noise reduction across it. When I model it in ANSYS, the noise reduction seems to change with the area of cross section. But in reality, no matter what the area of cross section is, the noise reduction should be the same at one particular frequency right?
Can anyone tell me what I am doing fundamentally wrong?
Any help would be appreciated
Thanks!





RE: Wind Noise through Windshield
TTFN
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RE: Wind Noise through Windshield
So is there anything fundamentally wrong when I am doing an acoustic analysis of the sample?
RE: Wind Noise through Windshield
TTFN
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RE: Wind Noise through Windshield
Would you know how to test it acoustically?
RE: Wind Noise through Windshield
I must confess I struggle with the idea of measuring the acoustic properties of a thing like a windscreen using a small disc in an impedance tube, since in practice its transmissibility will be controlled by its mounting, and bending modes etc, rather than very much that is innate in the material.
Cheers
Greg Locock
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RE: Wind Noise through Windshield
RE: Wind Noise through Windshield
What meshing are you using relative to the windscreen thickness.
RE: Wind Noise through Windshield
Would you be able to guide me as to how to model the longitudinal waves passing through? because i am facing problems when I try to go to higher frequencies by reducing the sample size. And the reason I am guessing is the flex modes in the transverse plane like u mentioned. Any ideas would really help.... Thanks hacksaw
RE: Wind Noise through Windshield
What is the critical frequency for your sample?
M
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Dr Michael F Platten
RE: Wind Noise through Windshield
Any ideas?
RE: Wind Noise through Windshield
RE: Wind Noise through Windshield
RE: Wind Noise through Windshield
propagation requires more that one element in the thickness direction, otherwise how do you handle the boundary conditions at the surfaces.