Hi all, I am working on a vibration analysis project and I am currectly facing some problems.
A trixial accelerometer is attached to the NI-PXI 4472 and LabVIEW is used to sample the data.
My goal is to obtain the raw data from the trixial accelerometer and display it in Acceleration, Velocity and Displacement with Time and Frequency domain.
A vibration exciter is set at 159.2Hz with an RMS amplitude of 5m/s^2 (Acceleration), 5mm/s (Velocity), 5micro m (Displacement) which the trixial accelerometer is attached and connected to the NI-PXI 4472. Therefore, in my labview program (picture attached), I have program it in such way. The result is as shown (pictures attached).
As far as I know, the value of the Velocity and Displacement graph in Time Domain should be close to the value of 5. (Please correct me if I am wrong). Secondly, there should not be any peaks as highlighted in the FFT Velocity and FFT Velocotiy graph as shown. But the graph displays random peaks at initial frequecy (0-20Hz) whenever the program is running. Thirdly, there should be a peak at 159.2Hz on the FFT Displacment graph but the graph shows no peak.
Please help me out as I have been scratching my head on how and where did it went wrong.
