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How to perform Order cut in LMS Test.Xpress?


Hi friends!


I have a question refers to LMS Test.Xpress.


I have just calculated the FFT of the time series recorded by my accelerometer installed in an electric motor (I previously integrated the signal to obtain the data velocity's units). I want to get the graph in "Order" to visualize faults in the components, with the motor RPM. The calculation command to do this process is ORD (Cx, Rx), where I know that Rx is the value registered in the RPM channel (I know that value). My question is: What is that channel?  I need to create it? I'm working offline and I did not use a tachometer.





Re: How to perform Order cut in LMS Test.Xpress?

Siemens Legend Siemens Legend
Siemens Legend

Hello Alvaro,

In order to use ORD(Cx, Rx) the RPM channel must be in the same dataset as the analog channel; which mean during data acquistion if you were measuring acceleration, you must acquiring a tacho/rpm channel as well.  Here I have a screen shot of the dataset which has a rpm channel:


Without a tacho you cannot use ORD(Cx, Rx) formula.