Am 07.05.2013 um 10:26 schrieb EBo <[email protected]>: >> >> I think it would be a very useful study topic (and a paper worth >> publishing) to start with this work, and go a step further >> >> a sketch for the work based on the above I would find interesting in >> general and very relevant to the discussions here: >> >> - the question I would care about is 'what is the incidence to loose >> steps, given a certain load, and a certain noise distribution in the >> stepping signal' >> - start by measuring actual noise (latency profiles) of currently >> used RT OSes, including a vanilla kernel >> - create a signal generator can load and regenerate noise profiles >> (better not based on linuxcnc but hardware, say a microcontroller) >> - create a setup of stepper motor(s), a hires encoder, and a DC motor >> with a controllable load (eg switchable shunt resistors or somesuch) >> - come up with a way to detect lost steps based on input signal and >> encoder signal >> - automatically run various speed, noise and load profiles and >> qualify them by 'lost steps' incidence >> >> I think the result of such a study could provide fact-based answers >> to what latency in a soft-stepper context actually means, and that be >> very valuable >> >> Note this does _not_ address the (IMO more interesting) question how >> latency impacts 'path tracking quality' of a real and complete >> motion/pid etc servo setup; that would be worth a separate attempt, >> probably more based on control theory than measurements plus some >> verification >> >> no junior researchers out here itching to publish? >> >> - Michael >> >> ps: on the question of shunt resistors - Amit's company might have >> some scalable answers here, but Amit better explain their business >> himself ;) > > publishing? What is the target journal or outlet. Maybe one of the > academics can convince a student to take it on. It would take a lot to > really make this publishable in a peer reviewed journal/conference.
whatever, whoever - provided somebody actually does at last some meaningful work instead of contributing yet another round of conjectures as for publishable - that's the sales part of the job which might require senior attention given the amount of crap published as 'academic articles' and which even carries some lowlifers to tenure, the content shouldnt be the issue ;) -m > > EBo -- > > > ------------------------------------------------------------------------------ > Learn Graph Databases - Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and > their applications. This 200-page book is written by three acclaimed > leaders in the field. The early access version is available now. > Download your free book today! http://p.sf.net/sfu/neotech_d2d_may > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. This 200-page book is written by three acclaimed leaders in the field. The early access version is available now. Download your free book today! http://p.sf.net/sfu/neotech_d2d_may _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
