"Spectrum Peak Hold"
"Spectrum Peak Hold"
(OP)
Hello all,
I'm working with some accelerometer data and I'm wondering if anyone can give me a brief walkthrough of what's happening when I am looking at a "Spectrum Peak Hold"? I've tried googling the phrase and I get nothing useful. When I apply the SPH what comes out is just a frequency bandwidth with spikes at certain frequencies...I'm just not 100% sure what the amplitudes of these spikes actually represent. I know it's not an RMS value, and I assume it's, as the name suggests, it's just the "peak" acceleration at that particular frequency, but I can't find any information to back up this assumption. Any help would be great. Thanks.
-Tyler
I'm working with some accelerometer data and I'm wondering if anyone can give me a brief walkthrough of what's happening when I am looking at a "Spectrum Peak Hold"? I've tried googling the phrase and I get nothing useful. When I apply the SPH what comes out is just a frequency bandwidth with spikes at certain frequencies...I'm just not 100% sure what the amplitudes of these spikes actually represent. I know it's not an RMS value, and I assume it's, as the name suggests, it's just the "peak" acceleration at that particular frequency, but I can't find any information to back up this assumption. Any help would be great. Thanks.
-Tyler





RE: "Spectrum Peak Hold"
Walt
RE: "Spectrum Peak Hold"
Alittle more info about the process I'm using too, if it helps: I'm using an "Autopowers Linear" function, a hanning window, no weighting, and "peak" formatting...I tried switching it to "RMS" formatting and the numbers were all reduced by 1/sqrt(2) so I'm a little more confident that my original numbers are in fact "peak" accelerations.
Thanks again
-Tyler
RE: "Spectrum Peak Hold"
Walt
RE: "Spectrum Peak Hold"
Peak hold in general is the sort of thing that real engineers find useful sometimes while the theorists tear their hair out.
For instance, if you put an accelerometer on the hub of a wheel and drive down the road for a long time on different roads and different speeds, eventually you will get a nice peak at the wheelhop frequency.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: "Spectrum Peak Hold"
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: "Spectrum Peak Hold"
Walt