In-House R&D and
Re­search Co­op­er­a­tion

The IfTA product port­fo­lio is based on more than two dec­ades of ex­per­i­ence and con­tinu­ous de­vel­op­ment through mod­ern re­search ef­fort.

IfTA op­er­ates its own R&D de­part­ment. One of the main ob­ject­ives of the re­search is to gain new know­ledge about the causes of vi­bra­tions and how to avoid them. In­nov­at­ive solu­tions are val­id­ated by our de­vel­op­ments. Our re­search is the driv­ing force for products that ful­fill high eco­nom­ic ef­fi­ciency and qual­ity.

IfTA GmbH was foun­ded as part of a re­search pro­ject and re­search co­oper­a­tion con­tin­ue to play a major role in the com­pany also today. Co­op­er­a­tion with renowned uni­ver­sit­ies as part of na­tion­al and EU re­search co­oper­a­tion is an in­dis­pens­able com­pon­ent of our in­nov­at­ive strength.

 

We co­oper­ate to­geth­er with:

Our Public­a­tions

Karl­stet­ter, R.; Rouwen­horst, D.; Wid­hopf-Fenk, R.; Her­mann J.; Raoofy, A.; Trin­it­is, C.; Schulz, M.:
Turn­ing Dy­nam­ic Sensor Meas­ur­meent from Gas Tur­bine Info Insights: A Big Data Ap­proachPro­ceed­ings of ASME 2019 Turbo Expo: Tur­boma­chinery Tech­nic­al Con­fer­ence & Ex­pos­i­tion (GT2019-912591), ASME, 2019.

 


Rouwen­horst, D.; Wid­hopf-Fenk, R.; Her­mann J.; Haringer, M; Beck­er J.; Ger­hard, J.; Nie­der­mei­er, J.:
Part-Load Limit Re­duc­tion of a Frame 9E Using a Pre­curs­or for Com­bus­tion Dy­nam­ics. ASME. Turbo Expo: Power for Land, Sea, and Air, Volume 4A: Com­bus­tion, Fuels, and Emis­sions ():V04AT04A028, 2018.



Rouwen­horst, D.; Her­mann, J.; Po­li­fke, W.:

In situ iden­ti­fic­a­tion strategy of ther­moacous­tic sta­bil­ity in an­nu­lar com­bus­tors. In­ter­na­tion­al Journ­al of Spray and Com­bus­tion Dy­nam­ics, pp. 351–361, 2018.



Rouwen­horst, D.; Her­mann, J.; Po­li­fke, W.:

On­line Mon­it­or­ing of Ther­moacous­tic Ei­gen­modes in An­nu­lar Com­bus­tion Sys­tems Based on a State-Space Model. Journ­al of Engin­eer­ing for Gas Tur­bines and Power 139 (2), 2017.



Rouwen­horst, D.; Her­mann, J.; Po­li­fke, W.:

Bi­furc­a­tion study of azi­muth­al bulk flow in an­nu­lar com­bus­tion sys­tems with cyl­indric­al sym­metry break­ing. In­ter­na­tion­al Journ­al of Spray and Com­bus­tion Dy­nam­ics 9 (4), pp., 438-451, 2017.



Müller, R.A.J.; Her­mann, J.; Po­li­fke, W.:

Dir­ect Drive Valve Model for Use as an Acous­tic Source in a Net­work Model. In­ter­na­tion­al Journ­al of Acous­tics and Vibra­tion 21 (4), pp.  406-417, 2016.



Müller, R. A., Her­mann, J., & Po­li­fke, W.:

Con­trol au­thor­ity over a com­bus­tion in­stabil­ity in­vest­ig­ated in CFD. In­ter­na­tion­al Journ­al of Spray and Com­bus­tion Dy­nam­ics. pp.39–52, 2016.



Rouwen­horst, D.; Her­mann, J.; Po­li­fke, W.:

On­line mon­it­or­ing of ther­moacous­tic ei­gen­modes in an­nu­lar com­bus­tion sys­tems based on a state space model. Pro­ceed­ings of ASME 2016 Turbo Expo: Tur­boma­chinery Tech­nic­al Con­fer­ence & Ex­pos­i­tion (GT2016-56671), ASME, 2016.



Müller, R.A.J.:

Con­trol Author­ity for Act­ive Damp­ing of Com­bus­tion In­stabil­it­ies. München, Tech­nis­che Universit­ät München, Diss, 2015.



Rouwen­horst, D.; Her­mann, J.; Müller, R.; Po­li­fke, W.:

On the Per­form­ance of St­ab­il­ity Mar­gin Meas­ures for Ther­moacous­tic In­stabil­it­ies in Tur­bu­lent Com­bus­tion Sys­tems. 21st In­ter­na­tion­al Con­gress on Sound and Vibra­tion (ICSV21), 2014.



Koszt­in, B.; Heckl, M.; Müller, R.; Her­mann, J.:

Thermo-Acous­tic Prop­er­ties of a Burn­er with Axial Tem­per­at­ure Gradi­ent: The­ory and Ex­per­i­ment. In­ter­na­tion­al Journ­al of Spray and Com­bus­tion Dy­nam­ics, pp. 67–84, 2013.



Müller, R. A. J.; Temmler, C.; Wid­hopf-Fenk, R.; Her­mann, J.; Po­li­fke, W.; Stop­ford, P.:

CFD-Based Feas­ib­il­ity Study of Act­ive Con­trol on a Com­bus­tion In­stabil­ity. 20th In­ter­na­tion­al Con­gress on Sound and Vibra­tion (ICSV20), 2013.



Hiller, S.; Her­mann, J.; Wid­hopf-Fenk R.:

High Pres­sure Com­pressor St­ab­il­iz­a­tion by Con­trolled Pulsed In­jec­tion. ASME. Turbo Expo: Power for Land, Sea, and Air, Volume 8: Tur­boma­chinery, Parts A, B, and C ():pp. 117-124, 2012.



Müller, R. A. J.; Her­mann, J.; Po­li­fke, W.:

Dir­ect drive valve model for use as an acous­tic source in a net­work model. Int'l J. Acous­tics & Vibra­tion 3, pp.  2450-2457, 2012.



Müller, R. A. J.; Her­mann, J.; Po­li­fke, W.:

St­ab­il­ity lim­its and non-lin­ear char­ac­ter­ist­ics of a self-ex­cited com­bus­tion in­stabil­ity. 19th In­ter­na­tion­al Con­gress on Sound and Vibra­tion (ICSV19), 2012.

 



Müller, R. A. J.; Her­mann, J.; Po­li­fke, W.:
Com­par­is­on of ac­tu­at­ing op­tions for act­ive damp­ing of com­bus­tion in­stabil­it­ies. ISMA2012 Noise and Vibra­tion Engin­eer­ing Con­fer­ence, Janu­ary 2012.



Koszt­in, B.; Heckl, M.; Müller, R. A. J.; Her­mann, J.:

In­stabil­it­ies in a model gas tur­bine com­bus­tor with dif­fer­ent mean-tem­per­at­ure pro­files. 18th In­ter­na­tion­al Con­gress on Sound and Vibra­tion, Rio de Janeiro, Brazil, July 2011.



Koszt­in, B.; Heckl, M.; Müller, R. A. J.; Her­mann, J.:
In­stabil­it­ies in a model gas tur­bine com­bus­tor: The­ory and ex­per­i­ment. ICSV17, 17th In­ter­na­tion­al Con­gress on Sound and Vibra­tion, Cairo, Egypt, 18 - 22 July 2010.


Her­mann, J.; Hoff­mann, S.:
Im­ple­ment­a­tion of Act­ive Con­trol in a Full-Scale Gas-Tur­bine Com­bus­tor. Chapter in the book "Com­bus­tion In­stabil­it­ies in Gas Tur­bine Engines: Oper­a­tion­al Ex­per­i­ence, Fun­da­ment­al Mech­an­isms, and Model­ing" of Tim Lieuwen and Vigor Yang, Vol. 210, Pro­gress in Astro­naut­ics and Aero­naut­ics Ser­ies, 210,Pub­lished by AIAA, 2006.



Scheidler, S.; Mundt, C.; Metten­leit­er, M.; Her­mann, J.; Hiller, S.-J.:

Act­ive sta­bil­ity con­trol of the com­pres­sion sys­tem in a twin-spool tur­bofan en­gine by air in­jec­tion. Presen­ted at the 10th in­ter­na­tion­al Sym­posi­um on trans­port phe­nom­ena and dy­nam­ics of ro­tat­ing ma­chinery, ISROMAC, Honolulu, Hawaii, March 07-11, 2004 (Paper ID num­ber 073).

Lein­hos, D.C.; Scheidler, S.; Fottner, L.;Grauer, F.; Her­mann, J.; Metten­leit­er, M.; Orth­mann, A.:
Ex­per­i­ments in act­ive stall con­trol of a twin-spool tur­bofan en­gine. Presen­ted at the ASME TURBO Expo, Am­s­ter­dam, 3-6 June, 2002, GT 2002-2003.



Her­mann, J.; Orth­mann, A.:

Com­bus­tion Dy­nam­ics: Ap­plic­a­tion of Act­ive In­stabil­ity Con­trol to Heavy Duty Gas Tur­bines. Paper presen­ted at the RTO AVT Course on “Act­ive Con­trol of Engine Dy­nam­ics” pub­lished in RTO-EN-020 and held in Brus­sels, Bel­gi­um, May 14-18, 2001.



Her­mann, J.; Orth­mann, A.; Hoff­mann, S.; Ber­en­brink, P.:

Act­ive and Passive Con­trol of Com­bus­tion Os­cil­la­tions in a 260 MW Heavy-Duty Gas Tur­bine.
Paper presen­ted at the EUROTHERM Sem­in­ar No 67, ECOS 2000 Pro­ceed­ings, held in En­schede, Neth­er­lands, July 2000.



Her­mann, J.; Orth­mann, A.; Hoff­mann, S.; Ber­en­brink, P.:

Com­bin­a­tion of Act­ive In­stabil­ity Con­trol and Passive Meas­ures to Pre­vent Com­bus­tion In­stabil­it­ies in a 260MW Heavy Duty Gas Tur­bine. Paper presen­ted at the RTO AVT Sym­posi­um on "Act­ive Con­trol Tech­no­logy for En­hanced Per­form­ance Oper­a­tion­al Cap­ab­il­it­ies of Mil­it­ary Air­craft, Land Ve­hicles and Sea Ve­hicles", held in Braun­sch­weig, Ger­many, May 8-11, 2000.



Her­mann, J.; Orth­mann, A. and Hoff­mann, S.:

Ap­plic­a­tion of Act­ive Com­bus­tion Con­trol to a Heavy Duty Gas Tur­bines. 14th Int. Symp. on Air­breath­ing Engines, 5-10 Sep 1999, Florence, Italy.



Her­mann, J.; Orth­mann, A. and Hoff­mann, S.:

Act­ive Ista­bilty Con­trol of Com­bus­tion in Heavy Duty Gas Tur­bines. Sixth Int. Con­gress on Sound and Vibra­tion, 5-8 July 1999, Copen­ha­gen, Den­mark.


Hoff­mann, S.; Weber, G.; Judith, H.; Her­mann, J.; Orth­mann, A.:
Ap­plic­a­tion of Act­ive Flame In­stabil­ity Con­trol for Heavy Duty Gas Tur­bines. Pro­ceed­ings of the Power­Gen Europe Con­fer­ence, Frank­furt, 1999.



Hoff­mann, S.; Weber, G.; Judith, H.; Her­mann, J.; Orth­mann, A.:
Ap­plic­a­tion of Act­ive Com­bus­tion Con­trol to Siemens Heavy Duty Gas Tur­bines. Presen­ted at the Sym­posi­um of the AVT Panel on Gas Tur­bine Engine Com­bus­tion, Emis­sions and Al­tern­at­ive Fuels, Lis­bon, 12-16 Octo­ber, 1998.



Seume, J. R.; Vort­mey­er, N.; Krause, W.; Her­mann, J.; Hantschk, C.-C.; Zangl, P.; Gleis, S.; Vort­mey­er, D.; Orth­mann, A.:

Ap­plic­a­tion of Act­ive Com­bus­tion In­stabil­ity Con­trol to a Heavy Gas Tur­bine. ASME Asia 97 Con­gress and Ex­hib­i­tion, Singapur, 30. Septem­ber – 2. Ok­to­ber 1997. ASME-Paper 97-AA-119; auch ver­öf­fent­licht im ASME Journ­al for Gas Tur­bines and Power, Vol. 120, No. 4, Octo­ber 1998, pp. 721-726



Casentini, F.; Her­mann, J.; Vort­mey­er, D.; Gleis, S.:
NO- and CO-Re­duc­tion by Pulsat­ing the Air Flow on a Swirl Spray Burn­er. Acts of the Fourth In­ter­na­tion­al Con­fer­ence on Tech­no­lo­gies and Com­bus­tion for a Clean En­vir­on­ment, Lis­bon 7-10 July 1997, Vol. II, Ses­sion 23.3, pp. 17-25.



Her­mann, J.; Hantschk, C.; Zangl, P.; Gleis, S.; Vort­mey­er, D.; Seume, J.; Vort­mey­er, N.; Krause, W.; Orth­mann, A.:
Akt­ive In­stabil­ität­skon­trolle an einer 170 MW Gas­tur­bine. 18. Deutsche-Nieder­ländis­cher Flam­mentag, Delft/NL, 28.-29. August 97, VDI-Bericht No. 1313, S. 337-344.



De­lab­roy, O.; Lacas, F.; Poin­sot, T.; Can­del, D.; Hoff­mann, T.; Her­mann, J.; Gleis, S.; Vort­mey­er, D.:
A Study of NOx Re­duc­tion by Acous­tic Ex­icit­a­tion in a Liquid Fueled Burn­er. Com­bust. Sci. and Tech., Vol. 119, pp. 397-408, 1996.



Hantschk, C.; Her­mann, J.; Vort­mey­er, D.:
Act­ive In­stabil­ity Con­trol with Dir­ect Drive Servo Valves in Liquid-Fuelled Com­bus­tion Sys­tems. 26th Int. Sym­posi­um on Com­bus­tion, Naples, pp. 2835-2841, 1996.



Her­mann, J.:
An­re­gungs­mech­an­is­men und akt­ive Däm­p­fung (AIC) selb­s­ter­regter Ver­bren­nungsschwin­gun­gen in Flüssigkraft­stoff­syste­men. 1996



Her­mann, J.; Gleis, S.; Vort­mey­er, D.:
Act­ive In­stabil­ity Con­trol (AIC) of Spray Com­bus­tors by Mod­u­la­tion of the Liquid Fuel Flow Rate.
Com­bust. Sci. and Tech., Vol. 118, pp. 1-25, 1996.



Zangl, P.; Her­mann, J.; Orth­mann, A.; Vort­mey­er, D.:

Meas­ure­ment of the Peri­od­ic Flow In­stabil­ity Dur­ing a Self Ex­cited Com­bus­tion Os­cil­la­tion by LDV. Eight In­ter­na­tion­al Sym­posi­um on Ap­plic­a­tions of Laser Tech­niques to Fluid Mech­an­ics, July 8-11, Lis­bon, pp. 39.2.1-39.2.8, 1996.



Her­mann, J.; Zangl, P.; Gleis, S.; Vort­mey­er, D.:

Un­ter­suchung der An­re­gungs­mech­an­is­men selb­s­ter­regter Ver­bren­nungsschwin­gun­gen an einem Ver­bren­nungssys­tem für Flüssigkraft­stoff. 17. Deutscher Flam­mentag, Ham­burg-Har­burg, VDI-Bericht Nr. 1193, S. 251-260, 1995.



Her­mann, J.; Gleis, S.; Vort­mey­er, D.:
Akt­ive Däm­p­fung selb­s­ter­regter Brennkam­mer­schwin­gun­gen (AIC) bei Druck­zer­stäuber­bren­nern durch Mod­u­la­tion der flüssigen Brennstoffzu­fuhr. 16. Deutscher Flam­mentag, Clausth­al-Zeller­feld, VDI-Bericht Nr. 1090, S. 615-624, 1993.