transfer function from step response -- CFD Online Discussion Forums

May 24, 2016, 13:57

transfer function from step response

BigJoe

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Join Date: Feb 2016

Posts: 20

Rep Power: 10

As in the plot, I initiate a increase at inlet total pressure and check how long the pressure measurement takes to feel the step.The plot has negative value after I normalized parameters. I use bode and the bodeplot does not make sense for me, then switch to fft and it's a mess which has vortex shedding frequency that I cannot tell which is the correct transfer function.

Any suggestions?

Attached Images

	static_step response.jpg (55.3 KB, 12 views)
	total_step response.jpg (43.5 KB, 8 views)

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