Full spectrum Plot / Spectrum of Orbit
Dear Friends,
I would like to plot the Full Spectrum of Generator Shaft. I found some information about the same which I am reproducing below :
Full spectrum
The full spectrum is an additional diagnostic tool and is also called the spectrum of an
orbit. It shows the same information as an orbit but in a different format. It helps to
determine the degree of ellipticity (or flattening) associated with the various machinery
conditions along with the precessional direction for all the frequency components present.
To obtain the full spectrum, the orthogonal X and Y transducer signals are fed into the
direct and quadrature parts of the FFT input. The positive and negative vibration
components for each frequency are obtained. Positive is defined to be the forward
precession and the negative component as the reverse precession. These components
yield the following ellipticity and precessional information for a given orbit of any
particular frequency (1× or 2× or …):
• The sum of two components, forward and reverse, is the length of the orbit
major axis.
• The difference between the two components is the length of the orbit minor
axis.
• The larger of the two components, positive or negative, determines the
direction of precession that is forward or reverse.
One of the possible applications of full spectrum is analysis of the rotor runout caused by mechanical, electrical or magnetic irregularities. Depending on the periodicity of such irregularities observed by the X–Y proximity probes, different combinations of forward and reverse components are observed. The method forms the basis for many useful machinery diagnostics.
The full spectrum (just like the normal FFT) can be obtained in a steady-state analysis (a single FFT or waterfall) and even in transient analysis, which would then be called the full spectrum cascade (Figure attached).
I would like to know if anyone has the idea as to how to get this plot?
I am familiar with Labview and normal analysis tools available like FFT etc., but I need help in performing this Advanced Analysis in Labview.
Regards
Shourya
Solved!
Go to Solution.
Attachments:
A steady-state single full spectrum.JPG 9 KB
Dear Preston Johnson,
Thanks for your prompt reply.
Now I am able to open the VIs, however i am getting some errors in executing them, which I am attaching with this post. I hope you get some clues from the error lists and help me in sorting them out.I am sorry for bothering you so much :-)
With regards
Shourya
Message Edited by ssingh1 on 09-06-2009 11:32 AM
Attachments:
Error List in test Full Spectrum VI.JPG 50 KB
Error List in oa_Process Order Full Spectrum VI.JPG 38 KB
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// Site: www.pixelhivedesign.com
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Hi,
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Gyazo - 1752e1c73cefeb4442d4fa13bcdf2af0.png
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Mixing CleanAir LMAP and legacy non CleanAir APs in the same installation
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Message Edited by Ravens Fan on 07-25-2009 01:35 AM -
Hi,
My customer Cisco 5760 WLCs running as a HA pair. Clean Air has been configured on these boxes but when I do a sh ap dot11 5ghz cleanair summary all the APs show Spectrum Oper State as Down:-
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AP Name MAC Address Slot ID Spectrum Capable Spectrum Intelligence Spectrum Oper State
AP1 xxxx.xxxx.xxxx 1 Enabled Enabled Down
AP2 xxxx.xxxx.xxxx 1 Enabled Enabled Down
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Anyone got any ideas as to how I overcome this little obstacle?
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and Clean Air has been configured:-
ap dot11 24ghz cleanair
ap dot11 5ghz cleanair
Also the link you sent was for release 7 on the old series controllers whereas this is a HA pair of the 5760s running release 3.03.
I have been through the configuring Clean Air chapter for this release and it doesn't suggest anything I haven't already tried.
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How to set the number of averages for doing octave analysis
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I am using a 4472 DAQ for continuously acquiring time domain signal and doing octave band analysis using Sound and vibration tool kit. How can we set the number of averages while doing the Octave analysis. All the other FFT vi like FRF, Auto Spectrum, Cross Spectrum have an option for setting the number of averages and then the vi runs for those many averages and it stops. How this same logic can be applied while doing octave analysis.
Regards,
AnkitHi Ankit,
You may want to consider using the VI in a for loop. By wiring the "number of averages you wish to complete" to the count terminal ("N'), you can control how many times the VI runs.
Hope this helps,
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Best way of displaying a waform through a webservice
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I know my way around text based programming languages fairly well, but am very new to Labview.
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I have a DAQmx board of which I would like to show waveforms of the analog inputs on a website. The webservice documentation says webservices acutally support waveforms, but if I wire it to a terminal I can't start the webservice.
What I did now is split the x and y values, add them to an array and show them on a webpage using google Charts. This works, but only gives me the image of 1 reading of course. I know you can make a streaming web VI as well, which I could refresh every n seconds, but that still wouldn't give me a continuous stream to the webpage, it would just refresh the image...
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Vincent
Solved!
Go to Solution.You might want to take a look at the new NI Community here: https://decibel.ni.com/content/groups/web-services
They've posted up some examples of how you can use AJAX/javascript to retrieve data from a web service. You are probably right in breaking apart the waveform - javascript/google charts probably won't know how to handle the LabVIEW waveform data type so better to just send an array of numbers to plot on the chart.
How you update the chart will be up to you, your web service could either send the full XY plot each time you request it or you could just periodically poll for new values and add them to a local buffer on the client/browser side.
If you need faster update rates, you might want to check out my WebSockets library (linked in my signature).
Certified LabVIEW Architect, Certified TestStand Developer
NI Days (and A&DF): 2010, 2011, 2013, 2014
NI Week: 2012, 2014
Knowledgeable in all things Giant Tetris and WebSockets -
Hello,
I have written a program for a course. It recieves a wave file [via a browser windows searching through the file system] and preforms some manipulations on it.
Now that I have finished, my lectrurer told me to turn it into a java internet applet - where instead of browser window, one could enter a url [or still choose browsing].
So these are my questions:
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2) How may I change the program to support an url of a wave file? the code I have that deals with wave files is:
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protected static double duration, rate, LENGTH;
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AudioInputStream audioInputStream = null;
audioInputStream = AudioSystem.getAudioInputStream(soundFile);
// Get Audio Format information
AudioFormat audioFormat = audioInputStream.getFormat();
// Handle opening the line
SourceDataLine line = null;
DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
line = (SourceDataLine) AudioSystem.getLine(info);
line.open(audioFormat);
// Write the sound to an array of bytes
int nBytesRead = 0;
byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
while (nBytesRead != -1) {
nBytesRead = audioInputStream.read(abData, 0, abData.length);
if (nBytesRead >= 0) {
line.write(abData, 0, nBytesRead);
}Thank you so much.zellazode wrote:
...He is not a lecturer of Java. He is a lecturer of Complexity, ..This matter is too complex for him to be commenting on.
..Information theory etc.. Are you certain that was not Disinformation theory?
..We made a program that preforms Fourier transfrom, but then he said he would like this program to run on from the interent.An HTML form with a <input type='file'> could upload the info to the server. The server might deliver an image (with a view of one 'slice' of the spectrum - the spectrum at any one moment) of an animated GIF showing the spectrum during the course of the sound. If you wanted to tie the sound into that playback, look to delivering back a (e.g.) MOV to the client.
For the static or animated image, a browser (with no applet) will do just fine. For the MOV, it will take some kind of player. A Java applet with JMF could display a MOV.
BTW - I suspect this part of the project is way out of the league of either you or your 'vague waving hands' professor. -
How to plot 3D spectrogram using usrp2920 spectrum sensing output
hi,
i'm woring on Real-time spectrum sensing using usrp with labview. i would like to know how to plot the usrp baseband spectral info as a 3D spectrogram over the time interval of sensing.You can use the 3D graph from the 3D graph palette in LabVIEW.
You can use shift registers in a loop to catenate each new spectrum measurement (array) to Z matrix (which is the values matrix). This will create a kind of flow effect.
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