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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