The Train Wheel PtByPt VI must filter low- and high-frequency components of the train wheel waveform. Two Butterworth Filter PtByPt VIs perform the following tasks:

  • Extract the low-frequency components of the waveform.
  • Extract the high-frequency components of the waveform.

In the Train Wheel PtByPt VI, the Butterworth Filter PtByPt VIs use the following parameters:

  • order specifies the amount of the waveform data that the VI filters at a given time and is the filter resolution. 2 is acceptable for the Train Wheel PtByPt VI.
  • fl specifies the low cut-off frequency, which is the minimum signal strength that identifies the departure of a train wheel from the strain gauge. 0.01 is acceptable for the Train Wheel PtByPt VI.
  • fh specifies the high cut-off frequency, which is the minimum signal strength that identifies the end of high-frequency waveform information. 0.25 is acceptable for the Train Wheel PtByPt VI.
Related information Butterworth Filter PtByPt VI