Pre- and Posttrig­ger for the Ana­lys­is of Sporad­ic Events

Triggered stor­age in per­man­ent op­er­a­tion

In con­tinu­ous op­er­a­tion or in long-term tests of ma­chines or com­pon­ents, very large amounts of data are usu­ally gen­er­ated. For only data with a high res­ol­u­tion offer the ne­ces­sary in­form­a­tion con­tent for a suf­fi­cient ana­lys­is. In this con­text, the in­terest lies in the de­tec­tion and un­der­stand­ing of sporad­ic­ally oc­cur­ring ef­fects.

Clas­sic­al ex­amples for these ana­lyses are vi­bra­tion meas­ure­ments dur­ing load re­lief or emer­gency shut­downs of ma­chines or also the exact re­mov­al of meas­ur­ing points in test benches for the closer char­ac­ter­iz­a­tion of spe­cial op­er­at­ing points. Tran­si­ent pro­cesses such as ac­cel­er­a­tion, de­cel­er­a­tion, over speed and large speed fluc­tu­ations of ro­tors also fall into the range where so-called triggered stor­age provides a sens­ible stor­age vari­ant. Triggered stor­age is the con­trolled stor­age of data based on a lo­gic­al con­di­tion, e.g. to store data only if an amp­litude threshold value is ex­ceeded, if there is a major speed change or if manu­al trig­ger­ing oc­curs. The pre- and post-trig­ger time is the time be­fore and after the event that is also to be re­cor­ded.

The Op­tim­al Condi­tion

Chal­lenges with triggered stor­age

The ac­tu­al chal­lenge of triggered stor­age is the exact defin­i­tion of a trig­ger con­di­tion, e.g. the threshold value at which the data is re­cor­ded. If this threshold value is un­known, this leads to a com­plex prob­lem. If, for ex­ample, the threshold value is too high for a crit­ic­al amp­litude, no data will be re­cor­ded. If, on the other hand, it is se­lec­ted too low, data is per­man­ently re­cor­ded and the ac­tu­al events are lost or drowned in the data volume. In both cases this com­plic­ates the ana­lys­is, es­pe­cially for long-term meas­ure­ments.

Meas­ure­ment and Ana­lys­is Tech­no­logy for Continu­ous St­or­age

Our solu­tion for pre and post trig­gers

All IfTA sys­tems provide the so-called con­tinu­ous stor­age. This in­cludes seam­less long-term stor­age in­clud­ing high-res­ol­u­tion raw data. Meas­ure­ments over longer peri­ods of time (weeks & months) are thus pos­sible without any prob­lems and even sporad­ic events can be eas­ily meas­ured. Com­pact over­view files allow fast search­ing for events and thus ef­fi­cient work­ing.

Fur­ther­more, the IfTA sys­tems offer the pos­sib­il­ity of triggered stor­age with ad­justable pre- and post-trig­ger times, com­plex lo­gic­al trig­ger con­di­tions and much more.

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