I have a PSD on vehicle vibration simulation. However, I have obtained some negative acceleration PSD value outputs. As detailed, I have applied cross-correlation function for my stochastic road inputs. Did these cause the negative value of the PSD?
The Power Spectral Density function computed for one signal cannot be negative. The only one case for such kind of output is the cross PSD for which the values for particular frequency are complex number. If you make a mistake in the interpretation of that output then you can assume, that you got negative values. Can you tell me something more about the input singla and the algorithm (computer program) which you are using for computing the PSD?
I am sorry that I don't understand what is the singla you mean. I am using Optistruct from Altair to simulate the LTI vehicle model.
Of course the 'singla' word is a typing mistake - should be 'signal'.
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