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Difference between revisions of "NVGate Waterfall"
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[[category:NVGate]] | [[category:NVGate]] | ||
[[category:WikiOros]] | |||
The Waterfall module is used to stack data from NVGate plug-ins, such as Spectra, 1/n Octave, RPM, DC, or any scalar data values into one graph. Data is displayed as slices that are synchronized and can be sorted by references (time, RPMs or DC channel). We can display 3D data or profile (2D). | The Waterfall module is used to stack data from NVGate plug-ins, such as Spectra, 1/n Octave, RPM, DC, or any scalar data values into one graph. Data is displayed as slices that are synchronized and can be sorted by references (time, RPMs or DC channel). We can display 3D data or profile (2D). | ||
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====From the Show Result window==== | ====From the Show Result window==== | ||
The [[NVGate_Software_overview#Step_2_Show_results|Show Results]] window is the most common way of adding a result in the waterfall. Here I will show you how to simply display a waterfall of the [[NVGate FFT | The [[NVGate_Software_overview#Step_2_Show_results|Show Results]] window is the most common way of adding a result in the waterfall. Here I will show you how to simply display a waterfall of the [[NVGate FFT|average spectrum]] for an acceleration input. | ||
First, open the Show Result window, go in the ''FFT 1'' tab, and reach the ''Waterfall'' section : | First, open the Show Result window, go in the ''FFT 1'' tab, and reach the ''Waterfall'' section : | ||
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====From the graph window==== | ====From the graph window==== | ||
This method will allow you to add the result from a currently displayed [[NVGate_Display#Graph|graph]] into the waterfall. This will work with any result of NVGate [[NVGate Waterfall|compatible with the waterfall]]. As previously, we will add the [[NVGate FFT | This method will allow you to add the result from a currently displayed [[NVGate_Display#Graph|graph]] into the waterfall. This will work with any result of NVGate [[NVGate Waterfall|compatible with the waterfall]]. As previously, we will add the [[NVGate FFT|Average spectrum]] ''' of all the channels''' into the waterfall.<br> | ||
First of all, right-click on the grey border of the graph and go in the ''Add to Waterfall'' section : | First of all, right-click on the grey border of the graph and go in the ''Add to Waterfall'' section : | ||
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* '''Active Trace''' will only add the [[NVGate Active Trace|active trace]] of the graph into the waterfall. | * '''Active Trace''' will only add the [[NVGate Active Trace|active trace]] of the graph into the waterfall. | ||
<br> | <br> | ||
Here, we will select '''All Trace''', as we want to add all the channels of the [[NVGate FFT | Here, we will select '''All Trace''', as we want to add all the channels of the [[NVGate FFT|FFT plug-in]]. | ||
[[Image:WTF_RgtClick_AllTrace.png|700px|none]]<br> | [[Image:WTF_RgtClick_AllTrace.png|700px|none]]<br> | ||
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A profile can be used to plot trend over the time for DC inputs, Overall RMS level and Bode plots of Orders over the RPM value of the shaft.<br> | A profile can be used to plot trend over the time for DC inputs, Overall RMS level and Bode plots of Orders over the RPM value of the shaft.<br> | ||
In this section, I will show you how to display a profile of the [[ | In this section, I will show you how to display a profile of the [[NVGate_FFT#Display_available_results|Overall RMS level]] on a channel connected the the [[NVGate FFT|FFT 1 plug-in]]. I will present the three same methods presented in the previous section. | ||
====From the Show Result window==== | ====From the Show Result window==== | ||
The [[NVGate_Software_overview#Step_2_Show_results|Show Results]] window is the most common way of adding a result in the waterfall. Here I will show you how to simply display a Profile of the [[NVGate FFT | The [[NVGate_Software_overview#Step_2_Show_results|Show Results]] window is the most common way of adding a result in the waterfall. Here I will show you how to simply display a Profile of the [[NVGate FFT|overall level]] for an acceleration input.<br> | ||
First, open the Show Result window, go in the ''FFT 1'' tab, and reach the ''Profile'' section : | First, open the Show Result window, go in the ''FFT 1'' tab, and reach the ''Profile'' section : | ||
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[[Image:Profile_ConfigShowResult.png|400px|none]]<br> | [[Image:Profile_ConfigShowResult.png|400px|none]]<br> | ||
The profile window is now displayed in the current [[NVGate_Project_manager#Layout|layout]], and you can run the acquisition. However, you may need to adapt the [[NVGate_Waterfall#Glossary|depth of the waterfall]] to contain all the data. To do so, double-click on the dark grey border of the graph, in the [[ | The profile window is now displayed in the current [[NVGate_Project_manager#Layout|layout]], and you can run the acquisition. However, you may need to adapt the [[NVGate_Waterfall#Glossary|depth of the waterfall]] to contain all the data. To do so, double-click on the dark grey border of the graph, in the [[NVGate_FFT#Settings|FFT menu]], select ''Waterfall''. In the [[NVGate_Waterfall#Mode|''Mode'' tab]] of the waterfall, modify the ''Number'' parameter : | ||
[[Image:Addapt_Depth.png|700px|none]]<br> | [[Image:Addapt_Depth.png|700px|none]]<br> | ||
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[[NVGate_Waterfall#From_the_graph_window|As we did for the standard waterfall]], we will now see how to add a scalar value in the waterfall to create a profile directly from the result window. <br> | [[NVGate_Waterfall#From_the_graph_window|As we did for the standard waterfall]], we will now see how to add a scalar value in the waterfall to create a profile directly from the result window. <br> | ||
Here, we have [[ | Here, we have [[NVGate_FFT#Display_available_results|displayed the ''Overall level'']] an acceleration input from the [[NVGate FFT|FFT plug-in]] : | ||
[[Image:FFT_Overall_scalar.png|200px|none]]<br> | [[Image:FFT_Overall_scalar.png|200px|none]]<br> | ||
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Note that: %Block lost <nowiki>+</nowiki> %Block transferred = 100%. | Note that: %Block lost <nowiki>+</nowiki> %Block transferred = 100%. | ||
==FAQ== | |||
===FFT1 Tach vs EXT synch tach=== | |||
'''What’s the different between Ord1 Tach. and Tach.Ext Ang speed?''' | |||
The waterfall and profile provide new capabilities that improve readability and accuracy: Tachometer centered on FFT/SOA blocks. | |||
This allows centering tachometer speed at the center of the FFT/SOA trigger block(s). It is useful with long trigger blocks (High resolution analyses) to perfectly match the actual data with the order cursor or section. | |||
With classical tach (ext tach angular speed): | |||
The RPM is collected at the end of the analysis block. | |||
[[File:ord_tach.PNG|500px]] | |||
This situation leads to an offset in the waterfall calculation of the orders (cursors, sections). For a run up, as the angular speed is over evaluated, the order calculation is lower than the actual ones. | |||
With centered tach (FFT Tach or ORD Tach): | |||
The RPM is calculated as the average speed during the block duration to be synchronized with the analyzed data. | |||
[[File:center.PNG|500px]] | |||
With the centered tachometer, the orders calculations match more accurately the actual orders in waterfall. | |||
The computation of the angular speed takes in account the averaging, triggering and overlap used in the plug-in. | |||
The centered speed is calculated as: | |||
CT = (RPM (end of block) + RPM (begin of block)) / 2 | |||
The RPM centering and averaging is done in the analysis plug-in prior to be connected to the waterfall. To use the centered tach simply add the said tachometer to the corresponding plug-in (FFTn or SOAn). These additional tachometers are available in the waterfall as soon as one of the result of the plug-in is added to the waterfall. | |||
1. Add Tach to the Plug-in, | |||
2. Add plug-in results (Spectra, orders, etc..) to the waterfall, | |||
3. Display the waterfall, | |||
4. Select the Plug-in Tach, as a tachometer and reference | |||
[[File:fft_tach.PNG|400px]] | |||