Need help with hardware DAQ in Labview

Hello

I'm new to LabView programming so I need some advice from you guys... My goal to use the labview is to calculate the dynamic mass or the apparent mass of the human subject in a rigid seat. The dynamic mass is calculated as the ratio between the cross of the spectrum between strength and signal acceleartion so that the autospectre of the Basic acceleration signal that LabVIEW can be done using FRF. I've attcahed the VI tht I created in order to calculate the FRF and spectrum of auto for the force and acceleration of Basic. Number of samples = 1024, rate = 100 Hz and the acquisition mode is continuous for the acquisition of data. Acquired signals were filtered using a lowpass with cut filter off = 25 Hz frequency as my frequency range is from 0.5 to 20 Hz. the number of averages = 6, with an average of mode = RMS average weight = linear mode. This basically the implementation that I use for my experiments. Now coming to my questions... I would like to record the time signal for both strength and Basic acceleration to do some post treatment how to do that in Labview? Here I have to say that getting two coulmns of data were only one column is for the moment and the next is for the data of force (or acceleration), with my setting I have 6000 samples for 6 medium.

For preliminary tests, I used a rigid seat to acquire the strength and the Basic acceleration signal in Labview DAQ. the stage in this case should be about zero, but the answer in step with the VI me different gives a value of 180 degrees. I would like also to say that for some of the iteration, the value tends to zero, but after only 6 average it shows me about 180 degrees phase. Iwould wish I had some comments from that aspect also.

Thank you and best regards,

Suresh


Tags: NI Software

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