Difference between revisions of "NVGate Display"

<FONT SIZE = "6">'''DISPLAY, GRAPHS & TRACES'''</FONT>

===Introduction===

All the window areas described below are right clickable so the user can choose the active trace, apply an operator or change the scales.

=====Infotrace=====

Using keyboard arrows, you can select the active trace in the infotrace.

=====Traces names=====

In order to simplify the trace identifications in applications that manage many measurement points (structural dynamics, Roving impact hammer) the content of the front-end identification settings are inserted in the trace labels.

The trace labels display the ''Component'', ''Node'' and ''Direction'' when the corresponding setting is different from its default value:

Displayed when scale mode is selected and when the cursor is on a scale area. See cursor toolbar for details.

=====Zoom=====

Displayed when the magnifying tool is selected:  Used to select a rectangle in a graphic area, or to zoom in with a by left clicking and dragging.

=====Cursor=====

Displayed when cursor mode is selected: Used to move the cursor by left clicking and dragging.

=====Move=====

Displayed when <nowiki>’</nowiki>move mode<nowiki>’</nowiki> is selected. Used to change x and y scale boundaries by left clicking and dragging.

=====Rotation=====

Displayed when the rotation tool is selected: Used to rotate a 3D graph.

=====Marker=====

Used to modify the marker position and properties.

Apply any action to the displayed traces and/or graphs by using the contextual menus on the selected area.

====Infotrace menu====

From the Infotrace, right click and select Customize.

This dialog box is used to select the information to be displayed in the infotrace (cursor coordinates, marker values…).

1. 3D isometric

2. 3D perspective:

3. Freq/Time Colormap:

4. Time/Freq Colormap:

Gives the list of all the markers in the window, except record markers. In this dialog box, any window marker can be removed or modified.

* '''Select All:''' Checks all the items of the list

This dialog is only available for the Monitoring and Compressed windows. It contains the list of all record markers of the record signal opened. In the monitoring window, each record marker comment can be modified. In the compressed window, comments cannot be modified.

=====Reset Min & Max=====

Restores min and max values for the selected scale

====Window menu====

* '''Multi-trace: '''This mode displays all window traces of the same type in one graph. In several window types, two multi-trace graphs are displayed in the same window: for example, one for the Real part and one for the imaginary part. In this mode, a''' magnitude gathering mode''' can be activated in the set preferences window: this mode displays signals by creating one area for each Y magnitude included in the window. If two or more signals have the same Y magnitude, they will be displayed in the same area.

* '''Multi-graph: '''This mode displays one graph per trace in the window.

* '''Multi-trace 3D: '''This mode displays all traces in the same 3D graph.

* '''Real part: '''This mode displays the real part of the signal. It can be displayed in multi-trace, multi graph, or multi-trace 3D, depending on the graph type.

* '''Imaginary part: '''This mode displays the imaginary part of the signal. It can be displayed in multi-trace, multi graph, or multi-trace 3D, depending on the graph type.

* '''Magnitude: '''This mode displays the magnitude of the signal. It can be displayed in multi-trace, multi graph, or multi-trace 3D, depending on the graph type.

* '''Phase: '''This mode displays the phase of the signal. It can be displayed in multi-trace, multi graph, or multi-trace 3D, depending on the graph type.

* '''Merged magnitude/phase: '''This mode displays the magnitude and the phase of the signal in the same area. This is a multi-trace mode. The module scale is on the left of the graph and the phase scale is on the right.

=====Properties=====

<font color="#FF0000">

</font>'''Note''': you can memorize an active trace by using the insert button of the keyboard.

=====AutoMemorize=====

<nowiki>’</nowiki>AutoMemorize<nowiki>’</nowiki> traces consists in memorizing traces on the stop event. Select the graph to be memorized.

'''Warning''': if you are in manual trigger, or if there is an absence in the time, you won<nowiki>’</nowiki>t be able to notice it with the cascade view. In the following example, a pause has been made during the measurement; on the waterfall 3Dview (with time for reference) it is possible to see this pause. In the cascade view the pause won<nowiki>’</nowiki>t be noticed (number of block for reference).

=====Integrate/Differentiate=====

* '''dt: '''The result is integrated, so that acceleration becomes velocity. The formula used is:

* '''dt²: '''The result is integrated twice, so that acceleration becomes displacement. The formula used is:

* '''dx/dt: '''The result is derived, so that velocity becomes acceleration. The formula used is:

val_dx/dt = val  

(j()

* '''dx/dt²: '''The result is derived twice, so that displacement becomes acceleration. The formula used is:

val_dx/dt2 = val  

(j()²

* '''PSD (EU²/Hz): '''Calculates the Power Spectral Density of the result. The formula used is:

Where ENBW is the Equivalent Noise Band Width that takes into account the weighting windows (1 for Rectangular, 1.5 for Hanning, 1.36 for Hamming, 3.77 for Flat top) and ''val'' the RMS value.

* '''ESD (EU²/Hz²): '''Calculates the Energy Spectral Density of the result. The formula used is:

Where ENBW is the Equivalent Noise Band Width that takes into account the weighting windows (1 for Rectangular, 1.5 for Hanning, 1.36 for Hamming, 3.77 for Flat top) and ''val'' the RMS value.

* '''RMS PSD (EU/Hz'''^'''1/2''''''): '''Calculates the RMS Power Spectral Density of the result. The formula used is:

Where ENBW is the Equivalent Noise Band Width that takes into account the weighting windows (1 for Rectangular, 1.5 for Hanning, 1.36 for Hamming, 3.77 for Flat top) and ''val'' the RMS value.

* '''Arithmetic average: '''This dialog box is designed to create a new result which is the arithmetic average of several results. This average can be calculated only for results that are in the same window. They must also have the same x-Axis definition.

The formula of the calculated result is:<br>

'''Average_Result = Q  

(C1

Result_1 <nowiki>+</nowiki> C2

Result_2 <nowiki>+</nowiki> ... <nowiki>+</nowiki> Cn

Result_n)'''

To set the C_i coefficient, fill in the "Coef" value and then add one or several results with the button  

.

* '''Quadratic average: '''This dialog box is designed to create a new result, which is the quadratic average of several results. This average can be calculated only for results that are in the same window. They must also have the same x-Axis definition.  

'''Average_Result = Q  

<nowiki>[</nowiki>(C1

Result_1² <nowiki>+</nowiki> C2

Result_2² <nowiki>+</nowiki> ... <nowiki>+</nowiki> Cn

Result_n²)<nowiki>]</nowiki>½'''

To set the C_i coefficient, fill in the "Coef" value and then add one or several results with the button  

.

* '''Linear comparison: '''This dialog box is designed to create a new result, which is the comparison of 2 results. This operation can be calculated only for results that are in the same window. They must also have the same x-Axis definition.

The formula of the calculated result is:

'''Comp_Result = Q  

(Result_1-Result_2)'''

* '''dB comparison: '''This dialog box is designed to create a new result, which is the comparison of two results. The comparison is made so that the result shows the difference between the two results in dB. It corresponds to the calculation of the ratio between the two results. This operation can be performed only on results that are in the same window. They must also have the same x-Axis definition.

The formula of the calculated result is:

'''Comp_Result = Q  

(Result_1/Result_2)'''

Values displayed are values from the Active trace:

* Complex values:

For complex values the <nowiki>’</nowiki>Copy data<nowiki>’</nowiki> will displayed phase and module values.

=====Copy to Mask=====

To make this option available, a result template must be added to the window (using drag & drop for example).

Go to the "Chapter 5: Tools" to see more details about the Result template.

To create an alarm, select a result from the top list, a template from the bottom list and click the Add button. The list on the right displays a list of the existing alarms.

=====Waterfall window menu=====

* '''Add section: '''Creates a new section at the current position of the cursor. The extraction section is created only if a tach has been selected in the Waterfall.

To remove a section, select the desired type and the desired section, then click "Remove".

* Section properties: The XPos, ZPos, Freq or Order defines the position of the section in the Waterfall.

This Operator is available on XY extraction view and 3 operators are available: Min, Max and Arithmetic Average.

* ''Order Extraction'':

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This Operator take data spectrum by spectrum, for each spectrum there is a determination of the max value and of the corresponding order.

Check the section that must be added to the result selection. These sections will be saved as individual results (spectra, trigger blocks...)

The orientation of the 3D view of the waterfall can be modified by using the rotation button

.

<font color="#FF0000">

</font>A threshold is available on a waterfall by pressing the <nowiki>’</nowiki>y<nowiki>’</nowiki> button (or <nowiki>’</nowiki>ctrl y<nowiki>’</nowiki> for more precision).

<font color="#FF0000">

</font>

* SOA x: Triggered block, weighted block.

=====Properties=====

* X-Axis

* Sync. order x: Ord. inst. spectrum, Ord. avg. spectrum, Ord. spectrum.

----

=====Properties=====

* X Axis

* -180° -<nowiki>></nowiki> 180°: sets the phase graph Y-axis between –180° to <nowiki>+</nowiki>180°.

* 0 -<nowiki>></nowiki> 360°: sets the phase graph Y-axis between 0 to <nowiki>+</nowiki>360°.

*  

Rotations: sets the number of rotations to be displayed on the Y-axis.

Example for 5 rotations

* FFT x: Lissajous.

<font color="#FF0000">

</font>The perimeter of the Lissajous corresponds of the FFT length<nowiki>’</nowiki>s block.

=====Properties=====

* X Axis

* Nth-Octave: 1/n octave, Avg 1/n octave.

=====Properties=====

* Y Axis

* Tachometer: Angular speed

----

This page defines the way in which the scalar results are displayed.

* Display mode: There are two types of display:

* Bar graph

* Digital display

* Recorder: monitoring signal

=====Properties=====

* Trace color

* Zoomed signal

This kind of zoom can be done by <nowiki>’</nowiki>drag & drop<nowiki>’</nowiki> the selected zone you want to analyze.

After displaying the zoomed signal, on the recorded signal you can modify your zoom at any time. All change would be displayed automatically in the zoomed signal as soon as you modified your zoomed zone.

=====Properties=====

* Trace color

=====Source Signals=====

The time view is an oscilloscope-like viw of the Time Domain series which scrolls the signal on a user define duration

* Cursors 1-2 used for selection. The scalar values displayed in the info trace are computed according to this selection.

Scalar table may be setup to add / remove scalar that may be displayed:

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|

|&nbsp;

=====Properties=====

* Trace color

* Monitor: DC, Max, Min, Kurtosis

*  

Front-end: DC

=====Properties=====

* X Axis

* SOA X: Order profile

----

=====Properties=====

* X Axis

* -180° -<nowiki>></nowiki> 180°: sets the phase graph Y-axis between –180° to <nowiki>+</nowiki>180°.

* 0 -<nowiki>></nowiki> 360°: sets the phase graph Y-axis between 0 to <nowiki>+</nowiki>360°.

*  

Rotations: sets the number of rotations to be displayed on the Y-axis.

Example for 5 rotations

* FFT X: Coherence

=====Properties=====

* X Axis

Note that in order to provide a stable trace, the corresponding plug-in must be triggered by a keyphasor. This keyphasor (any edge event) being the phase reference of each revolution. In the case of synchronous order analysis, the plug-in is automatically triggered on the tach. pulses.

The shaft view shows the first entire revolution contained in the trigger block. If less than one revolution is contained in the trigger block, nothing is displayed. A tachometer must be connect to the FFT or SOA plug-in in order to show traces in the shaft view/

* SOA x: Triggered Shaft View

The following results may be displayed as Average Shaft View graphs on condition that a tachometer is associated to the plug-in and that time average is chosen:

=====Properties=====

* X Axis

Waterfall display features different type of view of the stacked results. All views are related to the same 3D space:

The Z-axis is the selected reference (RPM, time or number of slices in order of the acquisition) its range is the waterfall depth. You can change the reference for z-axis at any time. This is available for 2D and 3D view.

The RPM is collected at the end of the analysis block

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.

</font>The RPM is calculated as the average speed during the block duration to be synchronized with the analyzed data.

<br>

The centered speed is calculated as:

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.

=====D display modes=====

5. 3D isometric

6. 3D perspective:

7. Freq/Time Colormap:

8. Time/Freq Colormap:

----

Waterfall display provides extraction of section from the 3D space

These sections are linked with cursors of the 3D view:

During the acquisition, an autoscale is available on the z-axis (reference) if <nowiki>’</nowiki>z Adjust<nowiki>’</nowiki> is active.

The <nowiki>’</nowiki>Select Tacho<nowiki>’</nowiki> mode allows tracking an order in function of the selected tachometer. The extraction order could be done in function of the selected tacho.

* Order extraction (only available if a tachometer is active).

The sections are displayed in these 2D views. The sections can be managed in the section manager window (see waterfall window in chapter2 <nowiki>’</nowiki>Display<nowiki>’</nowiki>).

----

After being saved, the sections became independent results, reducing the amount of saved data when you are focusing only on extracted data.

* SOA x: Raw Orbit, Synthetized Orbit

The Raw Orbit graph displays an entire number of complete rotations contained in one block. At least one rotation is required.

=====Properties=====

* X Axis

The Gap is available in the Waterfall for the Monitor and Time domain analyzer plug-ins and only for the DC values.

=====Properties=====

* X Axis

This dialog box is used to set the axis values and behavior.

=====Min=====

Displays a single line.

=====Vertical dashed line=====

Displays a single dashed line.

----

A rectangle is displayed around the selected point.

=====Cross hair=====

No line is displayed but there is a target around the selected point.

=====Vertical <nowiki>+</nowiki> horizontal=====

Displays 2 lines, an horizontal and a vertical that cross the selected point.

====Dual====

Select 2 cursors from the window properties. That allows to compute delta values on X-axis and Y-axis.

----

Link the cursors of different graphs that share the same unit on the X-Axis. Once linked, all the cursors move at the same time and the same position.

====Link all cursors in one click====

Cursors can be linked one by one to follow the same X-coordinate. It is now possible to link/un link from the cursor contextual menu.

====Waterfall link====

=====Link=====

The markers allow quantifying measurement behaviors such as the band power between 2 frequencies, track signal harmonics or tracking the max amplitude of a signal…

There is also a copy function using the right click from the Infotrace that allows to paste the whole marker table to Word^® or Excel^®.

====Free====

=====Free marker properties=====

* Label: The label associated with the marker. The user can enter directly a name or pick <nowiki>’</nowiki>display current position<nowiki>’</nowiki> to display automatically the coordinates of the selected point.

* X & Y: x and y interpolations are active.

When the interpolation function is active, the interpolated value is preceded by a "i".

Computes and displays harmonic values for the selected trace(s).

=====Harmonic marker properties=====

* Harmonic visibility: Harmonics checklist. Only checked harmonics will be displayed.

* X&Y: x and y interpolations are active.

When the interpolation function is active, the interpolated value is preceded by a "i".

* The 2 following adjacent spectrum line levels (N-2, N<nowiki>+</nowiki>2) are lower than the central spectrum level minus the peak threshold

=====Peak marker properties=====

* Threshold: In the example below, the "Threshold" is 10 dB.

* Ignore under: Does not display the detected peak if the peak is under this value. In the example below, the "ignore under" value is –15 dB.

* Number of peak: Number of peaks to be displayed. That will first display the greatest peaks.

* X & Y: x and y interpolations are active.

When the interpolation function is active, the interpolated value is preceded by an "i".

:

The calculation of the damping factor is activated through the marker properties or preferences.

When it is activated an additional column is added in the corresponding marker table. The marker table can be saved in an MS Office document or simply copied and pasted.

Warning, using nonhomogeneous weighting windows (i.e.: equivalent noise bandwidths are not the same) on FRF channels leads to incorrect peak interpolation and damping results.

A maximum is defined as a local maximum such that the variation in size of spectral density of ray, in relation to other local maximum surrounding it, is greater than a set threshold

=====Max marker properties=====

* Hystersis

* Ignore under: Does not display the detected peak if the peak is under this value. In the example below, the "ignore under" value is –15 dB.

* Number of max: Number of max to be displayed. That will first display the greatest max.

* X & Y: x and y interpolations are active.

When the interpolation function is active, the interpolated value is preceded by a "i".

* Damping ratio damping ratio is calculated for each detected Maximum. The calculation is based on the Half-power-band-width method, where DR is the damping ratio:

The calculation of the damping factor is activated through the marker properties or preferences.

When it is activated an additional column is added in the corresponding marker table. The marker table can be saved in an MS Office document or simply copied and pasted.

Warning, using nonhomogeneous weighting windows (i.e.: equivalent noise bandwidths are not the same) on FRF channels leads to incorrect peak interpolation and damping results.

The management of side band markers selects the assumed porter and the first side band of modulation. The position of the cursor during the selection of the porter or the first side band is previously interpolated on the frequency axis, taking into account the frequency response of the weighting window used if the Interpolation setting allows this

=====Side band marker properties=====

* Start: Central value.

* X & Y: x and y interpolations are active.

When the interpolation function is active, the interpolated value is preceded by a "i".

Computes and displays power in signal range defined by start position and delta.

=====Power band marker properties=====

* Start: Start value for the power band computation.

Displays all band values

=====Octave marker properties=====

* Apply to

To add a kinematic marker to a window, select Kinematic from the ''Display/graph/Markers'' left button.

Then it is become possible to select one marker from the list. Click ''Select Kinematic Marker ''button to open the selection dialog. Select one line from the table of the current tab and close the dialog box. The corresponding marker will be applied double clinking on a spectral graph.

This type of marker may be manipulated from any of the sub-marker lines.

In the kinematic marker properties (Right click on it or through marker manager) the fundamental frequency may be adjusted in Frequency unit or RPM.

=====Kinematic marker Description=====

The Kinematic descriptions for these markers are taken from ''.csv'' (or Excel™) files.

The files may be modified to adjust the kinematics ratio. The files content are read every time the select kinematic marker is opened. No need to exit the NVGate software for update.

Computes and displays periodic values for the selected trace(s).The periodic allows identifying the periodicity and frequency of repeated phenomena identified into time series graphs

=====Periodic marker properties=====

* Period visibility: checklist. Only checked periods will be displayed.

For Excel^®:

====Marker table in reports====

The marker table can be droped in the report template. See Vol. 3 report Tools and ribbons for details.