Analysis of the order when there is a significant shift of DC signal
Thanks for reading this. I use the Toolkit NI LabVIEW Order Analysis for direct analysis of signals of pledge of deformation of an attachment to a car engine. My goal is to acquire data of a part of the calibrated strain connected to an engine during the rampup and identify the controls in the signal of the strain. I am not able to understand a problem I see with my results in the power of order spectrum.
I measure the signals of pledge of strain during the preparations for engine using the module 9235 cDAQ (1000 to 6000 RPM in 15 seconds). I also acquire the tachometer using the module NOR-9402 (counter). Then I converted the signals of the strain at the same angle signals and made the order power spectrum.
Please order power spectrum resulting Fig1 shows. What I find that is the DC offset in the signal of strain presents itself as a high amplitude (red or green) peaks in the power spectrum of order (see Fig 1) around the order of 0. Because of these enormous peaks around order 0, the peaks of the order of a real interest around 2 or 3 command (blue or purple) are difficult to discern in the graph.
The DC offset clearly shows the chart of strain vs RPM (RPM is a linear function of time), if necessary, it is identical to the strain vs time. The white line in figure 2 corresponds to the DC offset. In this example, the CC offset is constant during the rampup rpm, but more often, the party calibrated strain of experiences both change static and forced lengthening cyclic as in Fig. 3. Here the sudden part increases the deformation in traction, with cyclic constraint superimposed on top of that.
My questions are:
Am I missing a key here in preprocessing step?
-I need a high pass filter to remove DC offset?
Subtract the average value of the signal from the time signal based before sending to the treatment?
How does a handle signals that have a variable static elongation a cyclical signal above the static signal? This appears to me a common scenario in the measures of constraint because ESA undergoes two different static and dynamic constraints in a motor boat.
Thanks for your comments and advice!
You have several choices, depending on what you want to do.
If what you want is a nice parcel of land, and the DC signal not enough to affect your 1st order, then simply set the component continues to 0 once you analyze varies.
Presto - instant removal of DC. It is perfectly legitimate, as long as the domain controller is not wandering too. Mathematically, it is exactly the same as the withdrawal DC before analyzing. (an inverse THAT FFT of this result and you will get the signal without DC, if you don't believe me).
OR
You can do as Bob has suggested and take the average. If your length of block is short compared with the rate of change of the real continuous component, it is fine.
OR
You can remove the trend by interpolation. For example, for a block of 1024-pt, find the way to 100 points around (on each side of) the beginning of your block. Find the way to 100 points around (on each side of) the end of your block. Find an equation (Y = mX + B) to describe the trendline it and use this equation to subtract a different DC value for each point.
OR
You can remove the trend extrapolation and interpolation. For example, for a residence of 1024 pt. find the average of the first 100 points and the last 100 points and assign these values X = 50 and X = 973 (1023-50). Find an equation (Y = mX + B) to describe the trendline it and use this equation to subtract a different DC value for each point. You need to face the fact that X = 0 starts BEFORE your trend line at X = 50, but that is basic algebra.
Remove trendline technique is more accurate and necessary if the domain controller changes siugnificantly during your block.
Tags: NI Software
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