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August 24th, 2019, 02:40 AM  #1 
Newbie Joined: Aug 2019 From: Cyprus Posts: 1 Thanks: 0  Analysis of Time Domain signal
Hello guys, for the last 27 years I ran my own business collecting and analysing vibration data from production machinery. If you want to understand more, you could look at my website  just google efftek and steve ferry, that's me and my company. I am now (sort of) retired to Cyprus but when I'm not down by the pool, I am writing a program in VB.NET to remotely analyse vibration data. I have collated quite a number of DSP techniques into one (vb.net) library which if anyone wants, I'll send them. I wish to add to this library, shape factor and impulse factor. I have found equations but unfortunately, I'm not really a mathematician. Tell me in plain English to get RMS, you square each value in the sequence, add them together, divide by the length of the sequence then get the square root and I can do that, but write an equation with those Greek characters I see on the roadsigns here in Cyprus and I'm lost (I read Greek, I do know the alphabet, but my pronunciation is probably atrocious). Anyhow, the attached image shows the formulae I want to write code for, can somebody please tell me in English, in steps, how I calculate the Shape Factor and Impulse Factor and I can get on writing my code. I also need to write code for the bottom four values, Talaf  Inthar which are all log values and I assume these are log10 values, rather than natural log values but I wouldn't mind confirmation! Thank you for reading and fingers crossed you can speak my language! Regards, Steve. Last edited by skipjack; August 24th, 2019 at 03:21 AM. 
August 26th, 2019, 09:28 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,553 Thanks: 1403 
can you post a larger image? I can't read the formulae on the one you posted. 

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analysis, domain, signal, time 
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