NVGate 2022: Release note

NVGate 2022

New settings by default

The settings by default in NVGate have been update to the one below. With this default seetings, you can do rotating analysis measurement directly.. Be aware than if you load an exiting project , this is NOT affected you previous settings are keep. You can also easily change this settings.

FFT Overlap: 66%

FFT lines: 3200

FFT Overall low freq : 2 Hz

SOA resolution: 1/8

SOA overlap: 5

SOA OVL lower order: 0.2

Event Delta RPM: Delta velocity 10 rpm

Waterfall Depth: 1000

Tachometer/RPM Profiles/ duration: 120 sec

NVGate reader

Use NVGate in reader mode : no need usb dongle or hardware.

Fractionnal tach : ration over 100

: Fractional: Opens the properties dialog for the tachometers that derives from another one. Fractional tach. computes RPM speed for a non accessible shaft by using gear ratio setting. Adapted for gear boxes and transmissions. Note: the fractional tach. cannot be settled from the Vision interface, use the ASB for it. Used to define up to 4 fractional tachs using data from the tach or the Ext Tach.

Virtual tachs computes RPM speed for a not accessible shaft by using gear ratio setting.

• Label: the name of the output tach.
• Source: the source of a virtual tach can be any tach or Ext. tach.
• Tach ratio: this is the ratio between the output angular speed and the input angular speed. This setting is defined by the product of 2 fractions: N1/D1 * N2/D2 where N1, D1, N2 and D2 are integer values. Tach.1 / Tach.2 ratio maximum value can be set up to 100.

• Rotation: This setting defines the way the phase variation is counted: clockwise or counterclockwise for each tachometer.

The rotation side is managed independently for each tachometer (Ext. sync, input, D, combined and fractional). Default setup is Counterclockwise;

See Ext Sync § for details

• Average size: defines the average number used to compute the average speed. Revolution number n average speed is: avrg_speed[n-1] + (inst_speed[n-1] - avrg_speed[n-1]) / avrg_size.
• Max speed: predefine a maximum angular speed to preset the scale and order tracking maxima. The limit of Max speed depends on the sampling frequency of the input signal and is equal to: 60 * Fe / (2 * 2.56) for the maximum. The Max speed setting is also used:
• to specify the limit of Y axis of the RPM profile result
• to compute the limit of the maximum order of the SOA plug-in analyzer.
• Min speed: defines the lowest measured angular speed. All revolutions with a speed lower than Min speed are forced to 0 RPM. By default Min speed is expressed in RPM. Min speed is automatically adjusted to Max speed/1000 but it is possible to go lower.

Up to 3 real time: plug in SOA

Oros , leader on rotating vibration analysis, is the only one in the world to let you do at the smae time: 3 real time synchronous order analysis (this is also available in post analysis.)

Add on : PV (pressure volume) diagram

How to use :

• Define one (or more) channel as a pressure.
• Add this channel into Sync. order (SOA) plug in.
• On SOA plug in , average, domain, select: "Angular"
• Open PV_Diagram.exe
• Click on refresh (right click) in available results if you do not see anything.
• Select the input.
• Compute once will display the PV diagram base once based the last triggerd block.
• "background computation, will continuously compute the diagram.