low Harmonic frequencies in the signal strength

Hi all

I try to know what are the causes of noise in my signal, whether it's a faulty hardware or my lack of knowledge.

The system that I'm actually consist of two engines not to not (parker HV232) that provide the uprising due to frost harmonic + pitch motion with phase shift of 90 degrees (a kind of movement of fish tail beat). I have a load cell 3 - axes attached to the shaft of the motor, pitch, and it measures up, drag and torque on a plateau which oscillates in the tunnel water (oscillation is provided by these two Steps). Tunnel to provide the incoming stream.

Signals of strength are captured through SG-23 + PXI-6221 daq card, I put the gain on the last of them to +/-200 mV for better resolution.

When the engines are turned off, the noise level on the static signal is the threshold of resolution, and nothing strange is not shown in the signal, and its ghosts.

The problems begin when I initialize the motion on the steppers, FFT of the watch signal of the low frequency spikes that are exact multiplies the frequency of oscillation, I have attached a PDF for example.

Disengage amplifier/filter which was suggested by manufacturing, and suspect I have observed could be due to this I'm not sure at 100%. The VI I use filter band-pass data in the 0.2 to 6 Hz, but somehow I can still see noise beyond 6 Hz.

I was wandering perhaps someone has experience with similar issues and can suggest a solution on how to get rid of these harmonics.

Thanks in advance

I'm not an expert in the dynamics of the tunnel, but from what you say, it looks like they can't be noise but components generated due to the rotation of a mechanical Assembly. Normally people refer to these harmonics in the form of 'order', which means that they are a multiple of the frequency of rotation.

So maybe it's the attacker

1. check by an expert (the one that includes the mechanical system that you are using) that to the point where you measure the force will not get the components of the order.

2. understand what exactly is the measurand. What exactly do you want to do with the measured signal (RMS, FFT etc..) Then you will be able to figureout if components of the order may affect your measurement.

Oleks wrote:

Disengage amplifier/filter which was suggested by manufacturing, and suspect I have observed could be due to this I'm not sure at 100%. The VI I use filter band-pass data in the 0.2 to 6 Hz, but somehow I can still see noise beyond 6 Hz.

During filtration, the attenuation in the band determines how fast the signals will be thinning of the hard shoulder.

Tags: NI Hardware

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