Hi guys, I am stuck for this part on the signal analysis. I have gotten the z-axis data for the accelerometer and it is shown on the screenshot that I attached. How do I transform the data acquired properly by using Fast Fourier Transform to analyze the signal? The given VI now I used a FFT pt by pt analysis but is not working properly whenever I inject vibrations for the accelerometer, the amplitude remains constant at 100 the signature does not change. Could advise accordingly for this? Thank you.

Remember -- I am unfamiliar with the Modbus Protocol, so I have no idea how the accelerometer data are being sampled and how you are acquiring the data. I find it amazing that as part of a capstone project, you can't provide definite answers (or provide sufficient details, such as manual pages, setup parameters, etc. for me to figure it out myself) to questions such as what sampling rate you are using. So here are some questions that you should answer: What are you measuring? I know you are using a tri-axial accelerometer, but I don't know if you are measuring orientation (tape it to a helmet, have subject wear helmet while walking around), vibration (and of what, for example, electric motor rotating at 400 rpm), or impulse activity (impact hammer). What question(s) are you asking about your device? How does the concept of "time" and "repetition" enter into your question? For example, are you interested in how a building sways during the course of a day, or comparing how the vibration of a motor depends on the RPM at which it spins? Don't be afraid to attach the "Introduction" material for your Capstone report. If you still don't know how to answer the question of what Sampling Rate you are using, someone is either doing a very poor job in teaching Engineering or a very poor job in learning it. Make a concerted effort to determine this critical parameter -- talk to your fellow students, or talk to your instructors. Bob Schor

LabVIEW

Analysis of Waveform Data using Digital Signal Processing

Solved!

Solution

Accepted by topic author

Author

For this is a software sampled timing, hence the operating software and LabVIEW determines the sampling rate, wait(ms), also kudos to bob for guiding me on the right path back

Message 11 of 11

(596 Views)

LabVIEW

Analysis of Waveform Data using Digital Signal Processing

Re: Analysis of Waveform Data using Digital Signal Processing