referring to thread384-444725 about diesel enine frequency spectrum

[ranii]

Hi,
I am trying to analyze hydraulic pressure frequency spectrum of a system driven by a diesel engine (V12, 4 stoke). I almost exactly see the frequency activity around 110-130 Hz as the picture in thread384-444725 that is also about diesel engine. I am wondering it is coming from engine or not? if so, I am sure it is not fundamental frequency. The rpm is almost 2000 and fundamental should be 200 Hz. However, I do not see that in frequency spectrum.
Thanks,

 

[GregLocock]

120 Hz ish isn't going to be directly due to a V12 4 stroke at 2000 rpm.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[Tmoose]

"hydraulic pressure frequency spectrum "

I'd expect the hydraulic pressure variations to be nominally related to the type of pump and engine rpm.

https://nyoobserver.files.wordpress.com/2014/02/the_woody_allen_test_1.jpg?w=461&quality=80&h=600

 

[ranii]

True. All pumps frequencies are detected. However, I see no evidence of engine frequency in the spectrum.