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transfer function from step response

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Old   May 24, 2016, 13:57
Default transfer function from step response
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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?
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File Type: jpg total_step response.jpg (43.5 KB, 4 views)
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