Data Filter

[R13]

Hi,

I need to filter out the disturbances from the collected data above a certain value (ie I have engine rotations on the y axis and the maximum value could be 3500 rpm) but due to the disturbances i get some values well above 5000rpm. Is there any possibility to filter them out and say that i could retain the data only in a particular band  (eg from 500 rpm to 3500 rpm).

The option ChnFiltCalc filters only the time frequency, but i am in look out for filtering in the y-axis.

Thanks in advance....

[Brad_Turpin]

Hi R13,

I recommend that you programmatically use the Channel Calculator to flag and delete all the rows where the engine speed is out of range-- on both the engine speed channel and on all the other related channels in your data set.

If you're willing and able to send me a sample data set where your speed threshold is exceeded, I would be happy to write a quick VBScript to do this for you.

Brad Turpin
DIAdem Product Support Engineer
National Instruments

[R13]

Hi Turpin,

Since the data are a bit confidential, i cant send you the file for ur programming. But can you please send me the code for any exampled exercise, with which I could develope the program of my own.

A small hint wat i cld give you abt the data is that the output rpm varies from 500 to 3500 (more of a sine wave, but not precise) and suddenly there ae shoot ups (errors) tht are to be eliminated.

Thanks a lot

[Ralf_Mueller]

Hi R13,

Please have a look at the step-by-step procedure "Eliminating Outliers Using NoValues" which you will find in the DIAdem help system. This procedure explains pretty much the task you are looking for. Values which you have marked as NoValues (i.e. outliers) are ignored by the subsequent analysis steps.

Hope this helps,
Ralf

[Brad_Turpin]

Hi R13,

Take a look at these two examples, they show a range of approaches and techniques which you should be able to adapt to your needs.

Brad Turpin
DIAdem Product Support Engineer
National Instruments