NVH orders
NVH orders
(OP)
Does anyone know what the 5.45th order is?
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RE: NVH orders
Does it track operating speed perfectly?
Is it measurable at more than one location?
What resolution do you have?
What slew rate are you using?
Can you post a Campbell's diagram (contour plot)?
What is the typical operating speed of the machine (in rpm)?
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: NVH orders
An example: a six cilinder 4-stroke engine (one combustion cylce per two revolutions) generates a 3rd order (and harmonics).
RE: NVH orders
RE: NVH orders
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: NVH orders
In fact, 5.45th order could well be a bearing. I think SKF has a calculator for bearing frequencies on their site.
RE: NVH orders
For example, suppose you had a 5-blade fan driven at 1.09 x crank speed. It could produce a 5.45-order noise.