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Cool Channel Setup tricks for Triaxial Accelerometers

Siemens Genius Siemens Genius
Siemens Genius

(view in My Videos)

 

Looking to setup triaxial accelerometers quickly and correctly in LMS Test.Lab?  Triaxial AccelerometerTriaxial Accelerometer

 

If so, here are three tips for you!:

 

 

1.  Use Auto Fill

 

In the LMS Test.Lab "Channel setup" worksheet, highlight the PointId and Direction of a triaxial accelerometer.  Hover the mouse in the lower right hand corner of your selection.

 

Hover mouse in lower right corner of triaxial selection until double white arrow appearsHover mouse in lower right corner of triaxial selection until double white arrow appears

 

 Once a Double White arrow appears, drag the mouse down or up to fill in the other channels.  The "PointId" field will be automatically incremented, and the "Direction" fields will be filled with the same information as the original triax information.

 

 

Drag the arrow up/down with the mouse to auto fill triaxial information on the other channelsDrag the arrow up/down with the mouse to auto fill triaxial information on the other channels

 

2. One Wire Triaxial Accelerometers

 

If you use a Scadas V-24 card or ScadasXS, you can connect a 3 channel triaxial accelerometer with one cable.

 

Single Wire triaxial accelerometer and ScadasXSSingle Wire triaxial accelerometer and ScadasXS

For example, if you have a PCB Triaxial Accelerometer (either 4 pin or mini 4 pin), you can order PCB cables:

 

  • PCB Cable 010M136/M003 (LMS  lemo to 4 pin connector) where the "003" means 3 meters (5 and 10 can be substituted for the "3")  

 

OR

 

  • PCB Cable 034M59/M003 (LMS  lemo to 4-pin miniature connector) 

ScadasXS and Scadas V-24 lemo connection support single wire connections for triaxial accelerometersScadasXS and Scadas V-24 lemo connection support single wire connections for triaxial accelerometers

Compared to a traditional 3 BNC connection, this makes it impossible to cross wire the triaxial directions!

 

 

3.  Enforce Right Hand Rule Automatically

 

By default, directions on channels can be set independently.  Directions are not checked for compliance to the right hand rule.  This can lead to mistakes when doing a Modal Analysis or Operational Deflection Shape.

 

Default Channel Setup behavior allows directions to be set independently on each channelDefault Channel Setup behavior allows directions to be set independently on each channel

 

In Tools -> Channel Setup Visibility, add the channel setup field called "MultiChannel".  For any triaxial accelerometer channels, set the "MultiChannel" value to "Triax-RH".

 

 

Setting "MultiChannel" to "Triax-RH" limits direction selections to valid right hand rule combinationsSetting "MultiChannel" to "Triax-RH" limits direction selections to valid right hand rule combinations

 

Setting a group of three channels to "Triax-RH" limits the selection of directions to valid Right Hand Rule combinations.  No more "flyer points" on Modals and Operational Deflection Shapes!

 

Hope these tips help!

 

PS> If you are from Australia, there is a "Triax-LH"....

 

If you have questions, feel free to contact us!

 

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