Rota­tion­al Vibra­tions - Tor­sion­al Ana­lys­is

Rota­tion­al vi­bra­tions in ro­tat­ing com­pon­ents under al­tern­at­ing tor­sion­al loads, such as in gas tur­bines or in the drive shafts of com­bus­tion en­gines, place high de­mands on pro­tec­tion and dia­gnost­ic sys­tems. This is ex­actly where the IfTA ap­plic­a­tion for ro­ta­tion­al and an­gu­lar vi­bra­tions and tor­sion ana­lyses comes in. We offer a com­bin­a­tion of per­fectly matched hard­ware and soft­ware com­pon­ents for high-res­ol­u­tion and real-time ana­lyses in an ex­clus­ive bundle with our IfTA Dyn­aMaster and IfTA Ar­gusOMDS sys­tem solu­tions.

The core ele­ments of this ap­plic­a­tion are the High Speed Timer AT2 and the ana­lys­is soft­ware IfTA TrendView­er. To­geth­er they en­able the pre­cise iden­ti­fic­a­tion of dan­ger­ous ro­ta­tion­al vi­bra­tion con­di­tions in order to guar­an­tee safe ma­chine op­er­a­tion.  This in­creases the re­li­ab­il­ity and longev­ity of your sys­tem.

Rota­tion­al Vibra­tion
  • Meas­ure­ment
  • Ana­lys­is
  • Mon­it­or­ing
  • Pro­tec­tion

Ex­tens­ive and high-pre­ci­sion angle-re­lated eval­u­ation of ro­ta­tion­al and an­gu­lar vi­bra­tions:

  • Identi­fy tor­sion­al and an­gu­lar vi­bra­tions
  • Com­bined soft­ware and hard­ware mod­ule made up of award-win­ning high speed timer  AT2 & ana­lys­is soft­ware IfTA TrendView­er
  • Flex­ible design and com­pat­ib­il­ity with com­mon sensor prin­ciples

Avail­able as hard- & soft­ware bundle in com­bin­a­tion with our sys­tem solu­tions Dyn­aMaster and IfTA Ar­gusOMDS.

The Key Ad­vant­ages

High pre­ci­sion

The core mod­ule of this ap­plic­a­tion, the IfTA High Speed Timer AT2, provides a tem­por­al res­ol­u­tion of 10ns. This cor­res­ponds to a fre­quency of 100 MHz and al­lows us to identi­fy and ana­lyze dif­fi­cult to de­tect vi­bra­tions such as ro­ta­tion­al, an­gu­lar and tor­sion­al vi­bra­tions.

Reli­able pro­tec­tion

In com­bin­a­tion with the IfTA Dyn­aMaster or IfTA Ar­gusOMDS, e.g. long-term re­cord­ing, triggered data stor­age with pre- and post-trig­ger as well as pro­tec­tion shut­downs are pos­sible.

Flex­ib­il­ity & Com­pat­ib­il­ity

Fa­cil­it­ated and flex­ible design and com­pat­ib­il­ity with com­mon sensor prin­ciples. High input im­ped­ance (e.g. pho­to­di­odes can be con­nec­ted dir­ectly). Eas­ily and quickly ad­justable trig­ger threshold en­ables auto­mat­ic track­ing under changed meas­ure­ment con­di­tions.

Save costs

An­a­log sig­nals, e.g. from com­mon dis­tance sensors, can be fed in dir­ectly and can be re­solved in the pi­co­second range via threshold value-defined trig­gers, i.e. there is no need for ex­tern­al pro­cessing elec­tron­ics for ana­log in­com­ing sig­nals. This res­ults in cost sav­ings and high­er sig­nal qual­ity.

The Ap­plic­a­tion's core, the High Speed Timer AT2

The out­stand­ing pre­ci­sion and ver­sat­il­ity of the input card res­ul­ted in the award of the messtec + sensor mas­ters (2nd place) in 2017.

Ana­lys­is of Rota­tion­al Vibra­tions - Us­ab­il­ity Example

At first, the High Speed Timer AT2 meas­ures im­pulses with high tem­por­al res­ol­u­tion (top left in the fig­ure).

Depend­ing on the spe­cif­ic con­fig­ur­a­tion, this raw data can be used to cal­cu­late sig­nals for speed, vi­bra­tion angle, vi­bra­tion speed or vi­bra­tion ac­cel­er­a­tion, for ex­ample. Like any other input sig­nal, these can be used for fur­ther ana­lyses, e.g. FFT. For sub­sequent ana­lys­is pur­poses, these quant­it­ies are cor­rel­ated in char­ac­ter­ist­ic plots.

In the ex­ample we have chosen, the high-res­ol­u­tion raw data (top left) is used to cal­cu­late the vi­bra­tion angle (top right). From this, for ex­ample, har­mon­ics can be de­term­ined, in this case with a strong amp­litude of the 4th order (bot­tom left). A Camp­bell plot also il­lus­trates the res­ults of the fre­quency ana­lys­is (bot­tom right: spec­trum plot­ted over the ro­ta­tion­al speed).