nvh
nvh
(OP)
Can anybody give me an idea on how to calculate point mobility using Nastran/FEA for automotive applications.
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RE: nvh
Ah, perhaps I see. You need to apply a unit force spectrum to one direction of a node, as a dynamic analysis.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: nvh
If constrained then where to constrain.
Or it does not matter where to constrain.
RE: nvh
On a vehicle body I'd use free-free.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: nvh
RE: nvh
I'm not sure if you meant NTF/VTF as a transfer function. That would be a very complex relationship, for a realistic structure, but very simple for a vibrating plate, where it boils down to P/V, which is a well known relationship.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: nvh
For NTF I assume you hit the structure with an impact hammer and collect the pressure at the drivers ear.
RE: nvh
Well PM is just one VTF, so the same answer applies
"For NTF I assume you hit the structure with an impact hammer and collect the pressure at the drivers ear."
yup, or anywhere else. We've done acoustic modals of vehicles, collecting P/F for a grid throughout the cabin. We've also done P/V, using a loudspeaker as excitation.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: nvh
RE: nvh
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: nvh
RE: nvh
But, can you substitute one for the other? only if you understand the system very well.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.