Extract Order Data

[RussellSenior]

I have engine data where I am measure pulsations in the fuel rails.  The data is collected with an engine RPM sweep from 700RPM to about 4500RPM. I am most interested in viewing the time domain amplitude within a certain order range.  For example, I would like to see only half to third order data.  I am currently using Digital filters, and only looking at a section of my data at a time, so I was wondering if there is any way to digitally filter data based on order, rather frequency.  

Thoughts?

[Brad_Turpin]

Hi Russell,

DIAdem has several order analysis functions you can use for this-- though the ANALYSIS dialogs are only available with the DIAdem Professional version.  Have you tried the below posted application, which will work in any of the 3 DIAdem flavors?

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000x14vCAA&l=en-US

Brad Turpin

DIAdem Product Support Engineer

National Instruments

[RussellSenior]

Unfortunately, I do not have the professional version, and I use the linked program often (and learned how to do effecient rising edge detection with it, too).  I will try to convince my managment to purchase the upgraded version. 

Thanks.