Frequency response - sound and vibration

Hi,
I need to find the frequency response of the DUT. I am using the NI example from sound and vibration toolkit to do
so (LabVIEW 8.5\examples\Sound and Vibration\Getting Started\SVXMPL_Getting Started with Swept Sine (DAQmx).vi) now my problem is
to tabulate the phase difference between the stimulus and response when i do it i get constant values. Even though i dont give any response
signal to the channel i get the wave same as stimulus, is it suppose to be like that !!!!!!!!!! I will attach my vi so that it gives the idea where
i am measuring the phase difference pls check it and help me with this.....thank you in advance.
Attachments:
DAQ Freq resp (req)_trial.vi ‏121 KB

What is the DAQ card you are using for executing this Frequency Response?
This DAQ error is related to the output frequency of your signal higher than the possible output rate of the card. Basically, you are trying to update at a rate higher than the capability of the card.
For doing Frequency response, generally you need to have a NI DSA card (446x/447x/449x) with one Analog output and two analog inputs (minimum). Generate the swept sine signal from the Analog output channel, give this signal as input to your DUT and also to one of the Analog input channel. This input to your Analog input channel will act as your Reference signal. Then the response signal from your DUT, connect it to another Analog input channel. You would get a very good response results.
The reason why you need to have a DSA board is that, for doing Frequency response, we need to acquire both high frequency and low frequency components without much loss. This is possible only if your DAQ board has a higher dB value (in the range of >110dB) which is present only in DSA boards.
I have completed a Frequency Response Analysis just a week back with the same example programs. So there wont be any problem with that vi.
Regards,
Sundar Ganesh

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Need HELP! Sweep frequency using Sound and Vibration Assistant

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I'm new to LabView . I want to do frequency sweep test using Sound and Vibration Assistant. I added the sweep step and chose sin wave frequency as the parameters. I selected frequency from 1K hz to 10k hz with an increment of 500hz.
However, I do not know how to stay at one frequency for a while when sweeping the frequency. I hope there will be 200 cycles ( or 5 minutes) at one frequency in order to get steady result.
Could anyone tell me how to set this? Thank you!
Yue

Thank you for your reply!
I am using a shaker connected to the amplifier. Attached please find the plots.
Lena
Attachments:
2015-03-27 17.16.47.jpg ‏2650 KB
2015-03-27 17.13.52.jpg ‏2657 KB
2015-03-27 17.17.23.jpg ‏2326 KB

I am using sound and vibration assistant 7.0. I want to know if it is possible to convert the mag and phase plot to real and imaginary plots ??

I am using sound and vibration assistant 7.0 . I am using the impact test example given . I want to know if it is possible to convert the magnitude phase plot to real and imaginary plot in the sound and vibration assistant 7.0 ???

If you have LabVIEW, you can create a user step to perform the conversion in version 7.0. Sound and Vibration 2009 has a checkbox in the Frequency Response configuration page to export the real and imaginary components. Short of upgrading SVT, you can also install the evaluation version of NI LabVIEW SignalExpress 2009, and this will also upgrade the Frequency Response Step which is shared between the two products (but then you don't get all the other features that were also added in SV 2009).
Here are some links that may be useful to help decide whether you want to upgrade:
http://www.ni.com/soundandvibration/
http://www.ni.com/labview/signalexpress/
Doug
NI Sound and Vibration

Sound output with sound and vibration toolkit

Hi!
Wants to setup a system with two microphones that are connected to DAQ NI USB-9162 and perform a Frequency Response between them where one of them has the undisturbed signal (close in space) and the other the respons (further away). My problem is that I want to send out noise or multitone through labview to an amplifier with internal D/A connected to my USB (turns up as a soundcard in windows). I can not find this option to send out sound in the sound and vibration tool.
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Best regards
Fredrik

Fredrik76 wrote:
Ok so I have to use the Labview interface instead of the sound and vibration toolkits interface? I see the sound out option in Labview where my card apperas but not in the sound and vibration toolkits interface. Guess I have to add the options for the analysis manually then?
It should be easy to do some modifications if you have some code doing what you want, but not with a sound card. If you have some code just post it. So I can take a look. Note that sound cards do not support all sample rates. But all sound card do support 44100 Hz as sample rate. And newer sound card also higher rates. And how good your setup will be. Will depend somehow on your sound card. But by all means give it a try
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

Sound and Vibration Toolkit

We have LabView 7.1 and the latest Sound and Vibration Toolkit. I am interested in finding the natural frequency of metalic parts AND entire mechanical assemblies. To obtain the natural frequency, we have purchased an accelerometer and impulse hammer to perform bump testing. From the reading I've done, I believe I should use the FRF functions from the S&V toolkit. Can someone confirm this or direct me to the proper method?
thanks for your help

Hi WantToGolf,
Sounds like you're on your way!
Cable the output of the impulse hammer to analog input 0 and the output of the accelerometer connected to your device under test (DUT) to analog input 1. The frequency response functions (FRFs) included with the Sound and Vibration Toolkit are the methods you'll use to find the natural frequency of the DUT.
I would recommend using Baseband Frequency Response (DAQmx - No excitation).vi, located at:
C:\Program Files\National Instruments\LabVIEW 7.1\examples\Sound and Vibration\Frequency Analysis\Dual Channel Analysis\SVXMPL_Baseband FRF (DAQmx - no excitation).vi
This VI continuously acquires data from two channels in the same device. No source is provided from the DAQ board, as you will be providing one from the impulse hammer. Triggering from either channel is supported.
The data from each channel is scaled to engineering units, windowed, and the frequency response is computed. The results of the frequency response measurement can be displayed on a Bode plot or a Nyquist plot. The coherence is also graphed to evaluate the validity of the measured frequency response.
You could then use the frequency response to determine the natural frequency of the DUT. Let me know if you have further questions or if this does not resolve your issue!
Chad AE
Applications Engineer

Sound and vibration Toolkit 7.1 on Labview 8.0

Hello!
I kind of expect the answer is to cash out for a toolbox upgrade, but nevertheless I will ask the very logical question:
When I have an old Sound and Vibration Toolbox, how can I use it on a newer LabView Installation?
I could install, but when opening some of the example VI(SVXMPL_Averaged Frequency Response (DAQmx).vi), they do not work. The sub-VI's (e.g. svx_ClearAO_ClearAI (DAQmx).vi) have broken connections and even a mass compile didn't help. After the mass compile I have a long log of errors. So has anyone been successful in doing this without buying the newer version of the toolbox?

Hi
Let me double check the version of Sound and Vibration toolkit you installed
as the latest Sound and Vibration toolkit is version 6.0.
This information is in Measurement & Automation Explorer(MAX)
if you go to MySystem >> Software >> LabVIEW >> Sound and Vibration Analysis VIs.
As well as this, please let us know the version of your DAQmx driver.
It sounds many DAQmx VIs are broken and your DAQmx might not be a compatible version of the toolkit.
Regards,
Ayumi

Sound and Vibration Measurement Suite with PC Sound card?

Hi all,
I'm new to LabVIEW, so please bear with me.
I would like to take some basic network measurements of a single channel hardware audio device. I have a PCI sound card which I was able to play sound files and receive input with using the sound2 Simultaneous_Sound_IO.vi. I'm wondering if it's possible and how difficult it would be to integrate this VI with the VIs associated with the Sound and Vibration Measurement Suite? I've downloaded the trial version of the Measurement Suite and it appears to include all of the measurements I need (frequency response, THD, dynamic range), however they're all designed to work with NI DAQ hardware.
If it is possible, could someone point me in the right direction as far as integrating the two, or even post or direct me towards existing VIs if there are any?
Thanks so much

Which S&V vi's do you mean to be dedicated to NI hardware?
A quick peek into the addon show me waveforms as input and the sound vis have a waveform output.
OK I didn't look at the examples and by habbit ignore the express vis . But maybe you just want to use a program instead of programming your application?
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

Third octave operations with "sound and vibration toolkit"

Hi!
I’m working about third octave decomposition with a vibration signal.
I’m using the sound and vibration toolkit.
The sample frequency of my signal is 2400 Hz.
And I’m working with a 1 second vibration signal (so 2400 points).
Fs = 2400
N = 2400
I need to understand the different and successive operations that the “SVT Fractional-octave Analysis [IEC].vi”VI do.
In fact, I think that my frequency resolution (df = Fe/N=1Hz) is too low.
Do you have a solution?
Maybe I could turn into my 1 sec signal in 10 sec signal with 10 recopies and assemblage of my previous signal?
N’ = 10N so df = Fe/10N = 0.1Hz.
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Bastien of paris

Hello,
The first thing you have to do is to read the Chapter 7 of the user manual of the Sound and Vibration Toolset.
You can find it in : program -> National Instruments -> LabVIEW Sound and Vibration Toolset -> User Manual
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Octave Analysis VIs, settling time, and ANSI and IEC standards.
regards,
Marc L.
NIF

Velocity Displcement Calibration for Sound and Vibration Tool Kit

Hello Guys,
I have been working on sound and vibration tool kit recently.
I'm taking input from sound port of PC by signal generator and taking single and double Integration for velocity and displacement resp.
I want to check the correctness of the values for different amplitudes,and different frequencies of signal, velocity and displacement.
The RMS values for signal is calibrated as per signal generator, RMS value for the Velocity is correct for a limited frequency range
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I will appreciate replies,

Hey guys,
The following vi is working
for the signal generated with in Labview but if the signal is taken
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Attachments:
avd signal generator labview.vi ‏26 KB
avd mic port.vi ‏36 KB

Sound and Vibration toolkit for vibration analysis

Hi guys! I am new to Labview. I am trying to use Sound and Vibration toolkit to analyse the accelerometer signal mounted on a motor through myRio. The analysis are spectral map, order tracking, power spectrum, order spectrum etc. But nothing can be seen from the output graph. The only result I get is from vibration level.
Attached is a screen shot of my vi and actual vi file. Am I doing it correctly? I really need your help guys....
Thanks.
Attachments:
Vib.vi ‏384 KB

SK,
You have serious problems in your File.VI. Why are your writing to your file and then reading it right back? Worse, there is no guarantee that the File write will actually occur before the File Read. You have a race condition set up there between those two Spreadsheet File VI's.
If you want to maintain a history of whatever has already been written to the file, you should be building it into an array and storing in a shift register. Even if your File.vi would by chance work the way you want it to, storing data in the file system is much slower than maintaining your data in memory.
As for your while loop, it is going to run as fast as it can with respect to all the functions occurring inside of it. Is it possible you are getting 14 iterations of that while loop for each frequency step that is occurring?
Message Edited by Ravens Fan on 07-25-2009 01:35 AM

How to reset Sound and Vibration Spectral map

Hi,
I want to create a Campbell diagram for a rotating machine, in live (while the machine is rotating).
This diagram is basically a graph of the spectral content a a signal (Hz), versus the rotation speed (RPM).
I've found an express VI that seems to do what i want to do (Spectral Map, in the Sound and Vibration toolkit). The output of this VI is buffered so that it can run in live (The buffer vi is also a vi that comes from the Sound and Vibration toolkit).
The block diagram of my complete process is attached to this message, sorry it's a bit messy.
On the first run, this VI works as expected: as the machine is running up, the graph is filling up. Now if I want to make a second run-up, i need to first reset the VI. However once the vi has been reset, it won't ouput anydata!
I've tried different combination:
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None of them work, the colormap stays black.
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Thanks,
Regards,
peper
Attachments:
Reset waterfall.png ‏74 KB

Hi,
Attached to this post, you'll find a piece of code that replicates the problem I have in my main application.
If you run the vi with an initial small frequency (the frequency dial up simulates the rotation speed) and then increase that speed, you'll notice that the spectral map gets filled as expected.
The problem arises when I try to reset the spectral map (=do a new run-up):
- I set the frequency to a minimum
- I hit the reset button (the spectral map is emptied as expected)
- I slowly increase the frequency ===> the spectral map does NOT get filled up anymore. Or it gets filled up like 30 seconds after the run up or gets partially filled up.... in summary there is something wrong with the map each time I try to reset the septral map vi.
Let me know if you need more information.
Best regards,
peper2001
Attachments:
Campbell.zip ‏101 KB

Sound and Vibrate does not work at same time

Hi Support,
I have recently purchased BlackBerry Z3.
It does not support Sound & Vibrate at same time.
In Normal mode, I have enabled Sound and Vibrate but it does only give sound for incoming calls/messages.
(does not vibrate)
In Vibrate Mode, it does only vibrate.
This is the first time I am using Blackberry and I am annoyed with the basic feature not working.
Please respond.
Regards,
Sunil.
Solved!
Go to Solution.

I'm glad things are back to normal for you.
Cheers.
- If my response has helped you, please click "Options" beside my post and mark it as solved. Clicking the "thumbs up" icon near the bottom of my response would also be appreciated.

Average multiple signals together in sound and vibration assistant

Hello,
I would like to average octave analysis data from multiple microphone channels together to obtain a single set of octave analysis data to view within Sound and Vibration Assistant (a surface average from the microphones). I have created an octave averaging vi in LabVIEW to run in SVA, but I get the error that there are no signals in my SVA project to input into my vi. I have based the input of my vi on code generated from SVA which outputed multichannel octave analysis data, so I don't quite understand why the output from an octave analysis in SVA doesn't match up to the input of my vi.
I also would like to do this for multichannel power spectrum data, and I have tried creating my own vi for this as well with no success.
I am using LabVIEW 2011 32-bit along with Sound and Vibration Assistant 2011.
Any assistance with finding a solution to this problem would be greatly appreciated.
Thank You,
Eric Morgan
Attachments:
Octave Average.vi ‏13 KB
Power Spectra Average.vi ‏13 KB

Hello Jake,
Thank you for responding to my post. After recording the raw sound pressure data from my microphones, I placed an Octave Analysis step and a Power Spectrum analysis step in the playback section of SVA, and the outputs of these steps should have served as inputs to the VIs I created (I assume you only looked at the power spectrum averaging VI, as the octave averaging VI accepts a 1D array of clusters of center frequencies and band powers). I did find that my averaging VIs did not have the correct size of empty array going into the second For loop, so I have corrected this in the attached VI (for averaging the FFT).
Also, I was able to get my corrected VI for averaging the FFT to work after getting past a little quirk in SVA. After browsing to my VI in setting up the "Run LabVIEW VI" step, I had to click the "Refresh VI" button before it would let me select a power spectrum as its input.
I also think I figured out why the octave averaging VI doesn't work. I think it has something to do with the fact that the output of an Octave Analysis step in SVA can not be used as an input to any other steps within SVA, which makes sense most of the time since once you have performed an octave analysis, there is really no other processing of this data that would ever need done...except for my case of averaging the 10 channels together to obtain the surface average SPL (kind of important when testing according to ISO3744). If this is the case, I would consider this a bug in SVA, as any output from any step in SVA that can be displayed should be able to be used as an input to a "Run LabVIEW VI" step.
I agree with you that in the end, it would be easier to do everything in just LabVIEW if I were just collecting data for post-processing at a later date, but when investigating noise issues and collecting mounds of data in the process, SignalExpress makes it a little easier to sift through that data as it is collected/logged while still in our sound lab, which may give us some ideas of different ways to test at that moment and possibly find the cause of our noise issues.
Thanks again for responding to my post,
Eric Morgan
Attachments:
AverageFFT.vi ‏19 KB

Sound and Vibration - Order Cuts

Hi all,
I've started using the S&V Toolkit to perform order analysis on some data to perform correlation to a CAE model. I am using the Order Analysis VI's to plot spectral diagrams of my data which so far look good.
One of the items that I would like correlate with the CAE software is the frequency content for each order. The CAE software outputs 'Order Cuts' - I have attached an image showing the output of the CAE software that we use and what I would like to extract from the Labview results. What is the best or suggested method to be able to extract this from the spectral diagram?
Thanks in advance!
Attachments:
order-cut-example.JPG ‏139 KB

Unfortunately, there is no way for you to install Sound and Vibration 7 to LabVIEW2009 via the SV7 installer. For LabVIEW2009, Sound and Vibration 2009 is the right version. But if you do want to try SV7, you can try to do this:
1. Install SV7 and select 8.6 supports from the feature tree, you need to have LabVIEW 8.6 in your system for this.
2. When the installation completes, copy all folder and files under \National Instruments\LabVIEW 8.6 into \National Instruments\LabVIEW 2009.
3. Mass compile vi.lib\addons.
4. Launch your LabVIEW and have a try.

Sound and Vibration Spectral map not working in LabVIEW 2011

I recently installed the latest development suite with LabVIEW 2011 and sound and vibration toolkit.
Previously I have successfully used the express function "spectral map" without a speed profile for plot type "frequency-time". With the installation of LV2011 I get an error saying "OA Speed Profile attribute not found" when using the function.
The setup is pretty straight forward with express functions "Simulate Signals", "Spectral Map" and "Color Map" in series.
Is there a bug fix or workaround for this problem?
Attachments:
Spectral Map Error.png ‏30 KB
Spectral Map VI.png ‏36 KB

No, I haven't been able to make the Sound and Vibration Spectral Map express node work in LabVIEW 2011.
A workaround is to not use the express function for a spectral map. You can find the spectral map node under "Sound and Vibration"-"Order Analysis"-"Spectral Map".
I guess the speed profile should be the same for both the express and ordinary function. If so you need to input a cluster of 2 1D arrays, not a waveform. Array1 contains the time in seconds and Array2 the associated speed.

Frequency response - sound and vibration

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