Calculating response from FRF
Calculating response from FRF
(OP)
I have different FRFs for a 3DOF system. I want to calculate the response at 3rd DOF due to a sinusoidal input at the 2nd DOF. How do go about doing the calculation?
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Calculating response from FRF
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Calculating response from FRFCalculating response from FRF(OP)
I have different FRFs for a 3DOF system. I want to calculate the response at 3rd DOF due to a sinusoidal input at the 2nd DOF. How do go about doing the calculation?
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RE: Calculating response from FRF
You know
Haa
Hba
Hca
You want to know Hcb. I think it is Hcb= (Hca*Hba)/Haa
where all those operations are vector operations on the complex FRFs.
Cheers
Greg Locock
RE: Calculating response from FRF
RE: Calculating response from FRF
RE: Calculating response from FRF
Cheers
Greg Locock
RE: Calculating response from FRF
RE: Calculating response from FRF
250*cos(pi/2+18*t)
Cheers
Greg Locock
RE: Calculating response from FRF
The reason I suspect this result is because I get a gradually increasing response using numerical integration.
RE: Calculating response from FRF
RE: Calculating response from FRF
Cheers
Greg Locock
RE: Calculating response from FRF
RE: Calculating response from FRF
Cheers
Greg Locock
RE: Calculating response from FRF
RE: Calculating response from FRF
In the real world that is not what will happen, but the fourier analysis of your excitation would not be a single frequency, and neither would the response.
Cheers
Greg Locock
RE: Calculating response from FRF
RE: Calculating response from FRF
RE: Calculating response from FRF
such initial conditions generally result in transients, how long are you waiting for "steady state"
RE: Calculating response from FRF
RE: Calculating response from FRF
M
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Dr Michael F Platten