Ana­lyz­ing and Mon­it­or­ing Shaft Vibra­tions

As an add-on to IfTA TrendView­er and to our sys­tem solu­tions IfTA Dyn­aMaster and IfTA Ar­gusOMDS, the IfTA rotor dy­nam­ics con­fig­ur­a­tion is the per­fect mon­it­or­ing and dia­gnost­ic tool for the pro­tec­tion and the vi­bra­tion dia­gnos­is of ro­tat­ing ma­chinery, shaft trains and drive trains. It of­fers a com­pre­hens­ive pack­age of in­di­vidu­al­iz­able and in­tu­it­ive soft­ware mod­ules with­in the awar­ded ana­lys­is soft­ware IfTA TrendView­er. This al­lows to identi­fy over­loads and ma­chine dam­age and to react at an early stage to en­sure a safe ma­chine op­er­a­tion.

Ad­vant­ages of the rotor dy­nam­ic con­fig­ur­a­tion com­pared to con­ven­tion­al solu­tions

Our ex­clus­ive rotor dy­nam­ic con­fig­ur­a­tion of­fers sig­ni­fic­ant ad­vant­ages over the solu­tions avail­able on the mar­ket to date. In ad­di­tion to a flex­ible solu­tion, the in­crease of ef­fi­ciency and the qual­ity of the meas­ure­ments, the fol­low­ing be­ne­fits are offered:

  • Using user-defined con­di­tions and thresholds in both time and fre­quency do­main, ap­plic­a­tion-spe­cif­ic vi­bra­tions can be iden­ti­fied and ana­lyzed. At the same time, the flex­ib­il­ity of the sys­tem is main­tained.
  • Con­fig­ur­able num­ber of tracked har­mon­ics.
  • Freely ad­justable lay­outs that make re­cur­rent eval­u­ations easi­er and sig­ni­fic­antly faster.
  • Off­line cal­cu­la­tion of ad­di­tion­al para­met­ers.
  • Even though there is a con­sid­er­able amount of data to be stored con­tinu­ously, we offer a high per­form­ance ana­lys­is.
  • We also offer in­teg­rated data stor­age of vi­bra­tion data and op­er­at­ing data, e.g. via OPC, Profib­us, Mod­bus, DataSock­et, etc.
  • Pro­cessing of very large data sets (> 10 GB)

User-defined con­di­tions and con­fig­ur­a­tion of data stor­age, such as the con­di­tion­al stor­age of star­tup- and shut­down pro­ced­ures.

Rotor Dy­nam­ics
  • Meas­ure­ment
  • Ana­lys­is
  • Mon­it­or­ing
  • Pro­tec­tion

Ex­tens­ive re­cord­ing and ana­lys­is tools for ro­tat­ing ma­chines:

  • Detect ro­ta­tion­al vi­bra­tions
  • Pro­tec­tion and vi­bra­tion dia­gnos­is
  • Ex­tens­ive eval­u­ations with the IfTA TrendView­er. eval­u­ation soft­ware

Avail­able as soft­ware li­cense for IfTA Dyn­aMaster for meas­ure­ment and ana­lys­is and for IfTA Ar­gusOMDS for pro­tec­tion and ana­lys­is.

Act­ive Mon­it­or­ing of Rotor Dy­nam­ics

Rotat­ing ma­chines are mon­itored in ac­cord­ance with vari­ous stand­ards / re­quire­ments (such as DIN ISO 10816, ISO 7919, etc.) The ob­ject­ive of this mon­it­or­ing is to en­sure the safe op­er­a­tion of equip­ment through the (early) de­tec­tion of dam­age to the ma­chine being mon­itored.

Based on and in ad­di­tion to these ma­chine pro­tec­tion pro­ced­ures, a great deal of ef­fort is ex­pen­ded on tech­nic­al meas­ure­ment for ma­chinery dia­gnostics. This be­gins with the place­ment of many sensors (shaft- and hous­ing vi­bra­tion sensors, ac­cel­er­a­tion sensors, sensors for the meas­ure­ment of stor­age tem­per­at­ures, ...) and ends with the use of spe­cial sys­tems for the vi­bra­tion-dia­gnost­ic ex­am­in­a­tion of tur­bine gen­er­at­ors and ro­tors.

Through these pro­ced­ures, de­vi­ations from nor­mal op­er­at­ing be­ha­vi­or and fail­ure of or dam­age to com­pon­ents can be de­tec­ted early, and pre­vent­ive main­ten­ance meas­ures and gen­er­al main­ten­ance are easi­er to plan.

The op­er­a­tion­al avail­ab­il­ity of the ma­chine is in­creased, and the fail­ure of cent­ral and im­port­ant op­er­at­ing com­pon­ents can thus be avoided. With the use of the right meas­ur­ing tech­no­logy, com­plete shut­downs and pro­duc­tion losses can be aver­ted - es­pe­cially in the en­ergy- and pro­cess in­dus­tries.

Rotor dy­nam­ics Phenom­ena

  • Ex­cit­a­tion caused by mech­an­ic­ally and thermally in­duced im­bal­ances on ro­tat­ing parts
  • Ex­cite­ment caused by ro­tat­ing parts rub­bing on sta­tion­ary parts
  • Para­met­ric ex­cit­a­tion caused by rotor sec­tions with dif­fer­ent flex­ur­al ri­gid­it­ies
  • Mag­net­ic force ex­cit­a­tion caused by de­fects and elec­tric­al dam­age to gen­er­at­ors, or in­flu­ences from elec­tric­al net­works
  • Ex­cit­a­tion through coup­ling- and align­ment er­rors
  • Bear­ing in­stabil­ity, an os­cil­la­tion caused by the prop­er­ties of the oil film on the bear­ing
  • Vibra­tion­al ex­cit­a­tion caused by shrink-fit fric­tion
  • Wave in­stabil­ity, a vi­bra­tion caused by aero­dy­nam­ic forces (ex­cit­a­tion gap); caused by un­bal­anced cur­rents in parts of the flow pas­sage

Rotor dy­nam­ics Ana­lys­is Soft­ware: IfTA TrendView­er

For Power­ful Visu­al­iz­a­tions

With the help of IfTA Ar­gusOMDS and IfTA Dy­n­aMas­ter sys­tems, it is pos­sible to ana­lyze the ma­chine-dy­nam­ic per­form­ance of gas tur­bines, steam tur­bines, gen­er­at­ors or drive trains. The data-ana­lys­is soft­ware IfTA TrendView­er offer spe­cial­ized plots that visu­al­ize com­plex facts in a simple man­ner to ana­lyze rotor-dy­nam­ic phe­nom­ena fast and ex­tens­ively.

By com­bin­ing off­line and on­line data ana­lys­is in a single pro­gram, vi­bra­tion para­met­ers from the mon­itored ma­chine that are cur­rently being meas­ured can be com­pared with avail­able and shared meas­ure­ment data. In ad­di­tion to the dy­nam­ic data of the rotor dy­nam­ics, slower pro­cess vari­ables can also be dis­played in the same plot.

The Bode plot is a pop­u­lar way to rep­res­ent trans­fer func­tions. The ex­ample on the left shows the fre­quency re­sponse of a simple Laval rotor. Read­ings of the amp­litude and phase (re­l­at­ive to a speed sig­nal) of the first har­mon­ic ei­gen­mode can be taken as a func­tion of the fre­quency (e.g. ro­ta­tion­al speed in [RPM]) of the rotor.

Be­cause the IfTA sys­tem syn­chron­ously samples and ana­lyzes all dy­nam­ic chan­nels in real time, a trans­fer func­tion between any sig­nals can be cal­cu­lated and visu­al­ized "live".

The Nyquist plot shows the ima­gin­ary part plot­ted against the real part of the first har­mon­ic mode of a shaft dis­place­ment sig­nal. The point color de­pends on the ma­chine state (here: black: slow roll, blue: run up, green: steady state, red: run down).

The shaft cen­ter­­li­ne plot dis­­­plays the sta­­tio­n­a­ry mo­ve­­ment of a com­­pres­sor shaft with re­spect to a sta­­tio­n­a­ry bea­ring. The mean va­lues of two or­­tho­go­n­al dis­­­pla­ce­­ment sen­sors are plot­ted against each other.


The orbit plot dis­plays the mo­ment­ary ex­cur­sion of a ro­torkit shaft. Two dis­place­ment sig­nals from or­tho­gon­al sensors are plot­ted against each other.

The Camp­­bell plot dis­­­plays the spec­trum of a shaft dis­­­place­­ment sensor de­pend­ent on a speed sig­n­al in a user se­lec­ted time range. The x-axis dis­­­plays the speed, the y-axis the fre­quency and the color bar the mag­n­itude of the spec­trum.

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