On 05/04/2012 07:26 PM, Jon Elson wrote: > EBo wrote: >> Yes, those projects are uber cool, and I am familiar with some, but not >> all, of the tools you mention. My real point was "it would be REALLY >> cool if EMC/LinuxCNC has these analytical tools in its arsenal." I >> would LOVE to be wrong, but I do not remember hearing anything about >> these in the forums, documentation, etc. >> >> > I have a dynamic signal analyzer, but have not had stellar results using it. > But, it seems that one could build such a thing in HAL. You'd need a swept > sine wave generator to stimulate the system, and record the response of > the system, both amplitude and phase to the stimulus. Just add the sine > wave excitation to a constant position and feed this to the PID, and > record position. Then, feed that to a Fourier analysis.
Drawing on another one of my hobbies... Here is a description of some techniques for this sort of thing, including a link to a writeup from HP (from the 1960s) on using their wave analyzer. http://bnordgren.org/seismo/lpmeas3.pdf This has to do with seismometer design, but I think the principles are very similar. I have a few geophones (mentioned earlier in this thread) which might be usable for collecting vibration data. I don't have a good high-sample-rate ADC, but perhaps some scope traces would suffice. If someone has any specific tests they would like done with this on a 3-axis knee mill, I could give it a go. Karl ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
