PEOPLE

Rotordynamics Group NTUA is currently looking for MSc and PhD Students (update 03/2020)

 

Group Head

Assist. Prof. Athanasios Chasalevris, PhD

chasalevris@mail.ntua.gr | E.317 | +30 210 772 3681

You may download the CV of Athanasios, here.

 

PhD Candidates

Lysandros Anastasopoulos, MSc

anastasopoulos@mail.ntua.gr | M.001 | +30 210 772 3678

You may download the CV of Lysandros, here.

 

MSc Students

Ioannis Raptopoulos, BSc

jgraptopoulos@hotmail.com

 

Internship Students

Jean Charles Louis, BSc

May 2019 - July 2019

 

COURSES

Assist. Prof. Athanasios Chasalevris is responsible for the syllabus and delivery of the following courses

RESEARCH

Research Objectives and Interests

Τurbomachinery Rotordynamics

Linear and Nonlinear Rotordynamics of Turbines, Turbosystems, and Turbopumps

 

Controllable Bearings

Controllable/smart fluid film bearings of variable geometry for the vibration suppression and optimized operation in turbomachinery

 

Tribology

Hydrodynamic and Aerodynamic Performance of Oil and Gas Bearings

 

 

Fracture Mechanics

Cracked rotors

 

 

Diagnostics and Monitoring

Detection of Faults in Rotating Machinery (Bearing Wear, Rotor Cracks)

 

Nonlinear Rotordynamics

Analytical solutions on the nonlinear design evaluation of Turbosystems and in Design of Journal Bearings

PROJECTS

Ongoing and past research carried out in Industry and Academia

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Academic

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Academic

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Industrial

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Industrial

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Industrial

SUPERVISION

Athanasios Chasalevris is responsible for supervising PhD and Master thesis

 

 

SUPERVISION OF MASTER THESIS OR DOCTORAL THESIS

For the supervision of Master Thesis or Doctoral Thesis, the interested student may contact me (by email or phone) after checking the relative Research Field.

 

QUALIFICATIONS

The following qualifications are appreciated in Master and Doctoral Thesis:

- Knowledge of Dynamics (of Machines, Mechanisms, and Structures)

- Knowledge of Vibration Theory

- Knowledge of Machine Element Analysis

- Programming skills (preferred Matlab, C++, Python)

- Fluent in English (German language is also appreciated)

 

RESEARCH FIELD

- Dynamic analysis and Design of Rotating Systems, with interest in Turbomachinery for power generation, propulsion, and turbocharging of Diesel/Otto Engines (turbomachinery rotordynamics – steam/gas turbines, jet engines, automotive & marine diesel turbochargers, turbopumps in oil & gas industry or space propulsion)

- Nonlinear Dynamics of Rotating Systems – bifurcations, chaos, averaging methods on the design of nonlinear rotor systems

- Fluid mechanics and Tribology – sliding bearing performance, gas foil bearings

- Rotordynamics and Control – development of smart oil/gas/magnetic bearings)

 

A. Chasalevris

(last update June 2019)

 

For a greek version, click here.

 

PUBLICATIONS

  • Books
  • Journals
  • Conferences
  • Patents
  • Technical Reports
  • Book Chapters
[B2] A. Chasalevris, Analytical Solutions in Journal Bearing Simulation with Rotordynamic Applications. Springer Brief Series, Springer, NYC (US) (Under Preparation, to be submitted by July 2020)

 

[B1] A. Chasalevris, Nonlinear Simulation of Defected Rotor-Bearing Systems - Methods for Detection of Rotor Crack and Bearing Wear. LAP Lambert Academic Publishing, Saarbrücken, Germany (2011) ISBN-10: 3844385975
[J22] A. Chasalevris Stability and Hopf Bifurcations in Rotor-Bearing-Foundation Systems of Turbines and Generators. Tribology International (IF 2019: 3.517), 145, 2020, 106154

 

[J21] A. Chasalevris and J.C. Louis, Evaluation of Transient Response of Turbochargers and Turbines Using Database Method for the Nonlinear Forces of Journal Bearings. Lubricants (IF 2018: 1.87), 7, 78, 2019

 

[J20] A. Chasalevris and G. Guignier, Alignment and Rotordynamic Optimization of Turbine Shaft Trains Using Adjustable Bearings in Real Time Operation. Proc. IMechE Part C: Journal of Mechanical Engineering Science (IF 2017: 0.996), 0(0), pp. 1-21

 

[J19] A. Chasalevris and F. Dohnal, Improving Stability and Operation of Turbine Rotors Using Adjustable Journal Bearings. Tribology International (IF 2016: 2.903), 104, 2016, Pages 369-382, doi: 10.1016/j.triboint.2016.06.022

 

[J18] A. Chasalevris, An investigation on the Dynamics and Stability of High Speed Systems Using Analytical Floating Ring Bearing Models. International Journal of Rotating Machinery (IF 2016: 0.811), Vol. 2016, 2016, Article ID 7817134

 

[J17] A. Chasalevris, Finite Length Floating Ring Bearings: Operational Characteristics Using Analytical Methods. Tribology International (IF 2016: 2.903), (94) 2016, pp. 571-590

 

[J16] A. Chasalevris, Analytical Evaluation of the Static and Dynamic Characteristics of the Three-Lobe Bearing with Finite Length. ASME Journal of Tribology (IF 2015: 1.616), 137, 2015 art. No. 041701-1.

 

[J15] A. Chasalevris and F. Dohnal, A Journal Bearing with Variable Geometry for the Suppression of Vibrations in Rotating Shafts: Simulation, Design, Construction and Experiment. Mechanical Systems and Signal Processing (IF 2015: 4.116), 52-53 2015, pp. 506

 

[J14] A. Chasalevris and F. Dohnal, Vibration Quenching in a Large-Scale Rotor-Bearing System Using Journal Bearings with Variable Geometry. Journal of Sound and Vibration (IF 2014: 1.813), 333 (7) 2014, pp. 2087-2099

 

[J13] A. Chasalevris and F. Dohnal, A Journal Bearing with Variable Geometry for the Reduction of the Maximum Response Amplitude During Passage Through Resonance. ASME Journal of Vibration & Acoustics (IF 2012: 1.268), 134 (6) 2012 No. 61005.

 

[J12] A. Chasalevris and D. Sfyris, Evaluation of the Finite Journal Bearing Characteristics Using the Exact Analytical Solution of the Reynolds Equation. Tribology International (IF 2013: 2.907). (57) 2013, pp. 216-234

 

[J11] A. Chasalevris and D. Sfyris, Analytical Evaluation of the Finite Journal Bearing Impedance Forces Using the Exact Analytical Solution of the Reynolds Equation. Journal of Vibration Engineering and Technologies (IF 2014: 0.730) (former: Advances in Mechanical Engineering). 2 (5) 2014

 

[J10] A. Chasalevris and C. A. Papadopoulos, Experimental Detection of an Early Developed Crack in Rotor-Bearing Systems Using an AMB. International Journal of Structural Integrity (IF 2014: 0.617), 333 (7) 2014, pp. 2087-2099

 

[J9] A. Chasalevris and C. A. Papadopoulos, A novel semi-analytical method for the dynamics of nonlinear rotor-bearing systems, Mechanism and Machine Theory (IF 2014: 1.660), (72) 2014, pp. 39-59

 

[J8] A. Chasalevris and C. A. Papadopoulos, Coupled horizontal and vertical bending vibrations of a stationary shaft with two cracks. Journal of Sound and Vibration (IF 2008: 1.364), 309 (3-5) 2008, pp. 507-528

 

[J7] A. Chasalevris and C. A. Papadopoulos, Identification of multiple cracks in beams under bending. Mechanical Systems and Signal Processing (IF 2006: 2.368), 20 (7) 2006, pp. 1631-1673

 

[J6] A. Chasalevris and C. A. Papadopoulos, A continuous model approach for cross-coupled bending vibrations of a rotor-bearing system with a transverse breathing crack. Mechanism and Machine Theory (IF 2009: 1.407), 44 (6) 2009, pp. 1176-1191.

 

[J5] D. Sfyris and A. Chasalevris, An exact analytical solution of the Reynolds equation for the finite journal bearing. Tribology International (IF 2012: 2.046), (55) 2012, pp. 46-58.

 

[J4] A. Chasalevris, F. Dohnal and I. Chatzisavvas, Identification of the wear pattern in journal bearings using external excitation by a magnetic bearing. Tribology International (IF 2014: 2.539), (71) 2014, pp. 158-167

 

[J3] A. Chasalevris, P. Nikolakopoulos and C. A. Papadopoulos, Dynamic effect of bearing wear on rotor rotor-bearing system response. ASME Journal of Vibration and Acoustics (IF 2013: 1.147), 135 (1) 2013, art. No. 011008.

 

[J2] K. Saridakis, A. Chasalevris, A. Dentsoras and C. A. Papadopoulos, Applying neural networks, genetic algorithms and fuzzy logic for the identification of cracks in shafts by using coupled response measurements. Computers & Structures (IF 2008: 1.223), 86 (11-12) 2008, pp. 1318-1338

 

[J1] K. Gertzos, P. Nikolakopoulos, A. Chasalevris and C. A. Papadopoulos, Wear identification in rotor-bearing systems by measurements of dynamic bearing characteristics. Computers & Structures (IF 2010: 1.719), (89) 2010, pp. 55-66
*speaker

 

[C33] L. Anastasopoulos and A. Chasalevris*, Stability and Bifurcation Analysis of Complete Turbine-Generator Rotor-Systems Applying Numerical Continuation and Component Mode Synthesis. IMechE Vibrations in Rotating Machinery – VIRM 2020, Liverpool (UK), (September 2020)

 

[C32] F. Dohnal*, A. Chasalevris and H. D. Klement, Estimation of fluid-film forces after blade loss in a flexible rotor. 11th International Conference on Structural Dynamics – EURODYN 2020, Athens (GR), (June 2020)

 

[C31] A. Chasalevris*, Stability Margins of Large Turbine Power Systems under Nonlinear Approach. 12th International Congress on Mechanics – HSTAM 2019, Thessaloniki (GR), (September 2019)

 

[C30] A. Chasalevris*, Nonlinear Stability of Turbine and Generator Rotors Applying Hopf Bifurcation Theory. 14th International Conference on Vibration Problems – ICOVP 2019, Crete (GR), (September 2019)

 

[C29] F. Dohnal*, A. Chasalevris and H. D. Klement, Rotor-Structure Interaction: Complex Foundation Models in MADYN. 14th International Conference on Vibration Problems – ICOVP 2019, Crete (GR), (September 2019)

 

[C28] A. Chasalevris, An Extension of the Bearing Database Method to Enable Nonlinear Transient Analysis in the Standard Rotordynamic Design Evaluation of Turbomachinery. 13th Int. Conf. Dynamics of Rotating Machinery – SIRM 2019. Copenhagen (DK), (February 2019)

 

[C27] A. Chasalevris* and G. Guignier, Real-Time Alignment and Operation Optimization of Turbine Shaft Trains Using Adjustable Bearings. 16th EDF/Pprime Workshop, Futurescope (F), (October 2017)

 

[C26] A. Chasalevris* and F. Dohnal, Enhancing Stability of Industrial Turbines Using Adjustable Partial Arc Bearings. 13th Int. Conf. on Motion & Vib. Control - MOVIC & RASD 2016, Southampton UK, (July 2016)

 

[C25] A. Chasalevris* and F. Dohnal, Modal Interaction and Vibration Suppression in Industrial Turbines Using Adjustable Journal Bearings. 13th Int. Conf. on Motion & Vib. Control - MOVIC & RASD 2016, Southampton UK, (July 2016)

 

[C24] F. Dohnal* and A. Chasalevris, Exploiting Modal Interaction During Run-Up of a Magnetically Supported Jeffcott Rotor. 13th Int. Conf. on Motion & Vib. Control - MOVIC & RASD 2016, Southampton UK, (July 2016)

 

[C23] A. Chasalevris*, Evaluation of the Dynamic Characteristics of the Three-Lobe Journal Bearing with Finite Length Using Analytical Methods. IFTOMM Int. Conf. on Engineering Vibration ICoEV2015, Ljubljana, Slovenia (Sept. 2015)

 

[C22] A. Chasalevris*, An Investigation on the Dynamics of High-Speed Systems Using an Analytical Model for the Floating Ring Bearings and the Rotating Shaft. IFTOMM International Conference on Engineering Vibration ICoEV2015, Ljubljana, Slovenia (Sept. 2015)

 

[C21] A. Chasalevris*, Evaluation of the Floating Ring Bearing Characteristics Using Analytical Methods. IFTOMM International Conference on Engineering Vibration ICoEV2015, Ljubljana, Slovenia (Sept. 2015)

 

[C20] F. Dohnal* and A. Chasalevris, Inducing modal interaction during run-up of a magnetically supported rotor. 13th International Conference in Dynamical Systems Theory and Applications DSTA 2015, Lodz, Poland (2015)

 

[C19] F. Dohnal*, B. Pfau and A. Chasalevris, Analytical predictions of a flexible rotor in journal bearings with adjustable geometry to suppress bearing induced instabilities. 13th International Conference in Dynamical Systems Theory and Applications DSTA 2015, Lodz, Poland (2015)

 

[C18] A. Chasalevris* and F. Dohnal, Construction and Experimental Application of a Variable geometry Journal Bearing (VGJB) for the Vibration Suppression of Rotors. 9th IFToMM Rotor Dynamics 2014, Milan, Italy (Sep. 2014)

 

[C17] A. Chasalevris and C. Papadopoulos*, Experimental detection of an early developed crack in rotor-bearing systems using an AMB. ICEAF III, Kos, Aegean Archipelago, Hellas (Jun. 2013)

 

[C16] A. Chasalevris* and F. Dohnal, Experimental identification of wear in journal bearing using an active magnetic bearing. 10th International Conference on Vibration in Rotating Machines SIRM 2013, Berlin, Germany (Feb. 2013)

 

[C15] A. Chasalevris* and D. Sfyris, Analytical evaluation of the finite journal bearing impedance forces using the exact analytical solution of the Reynolds equation. International Conference On Vibration Engineering And Technology of Machinery VETOMAC VIII, Gdansk, Poland (Sep. 2012)

 

[C14] A. Chasalevris* and D. Sfyris, On the analytical evaluation of the lubricant pressure in the finite journal bearing. ASME 2012 International Design Engineering Technical Conf. IDETC/CIE 2012, Chicago, Illinois, USA (Aug. 2012)

 

[C13] A. Chasalevris*, F. Dohnal and R. Markert, Symptoms of Misaligned Worn Journal Bearings in Rotor Response under External Excitation by a magnetic bearing. ASME 2011 International Design Engineering Technical Conferences IDETC/CIE 2011, Washington, DC, USA (2011)

 

[C12] A. Chasalevris*, F. Dohnal and R. Markert, A Journal Bearing with Variable Geometry for Reduction of Rotor Resonance Vibration. 10th biennial International Conf. on Vib. Problems ICOVP 2011, Prague, Czech Republic (2011)

 

[C11] A. Chasalevris and C. Papadopoulos*, Structural Integrity Assessment of Rotating Systems. 2 International Conference of Engineering Against Fracture. ICEAF 2011, Mykonos, Hellas (2011)

 

[C10] A. Chasalevris*, P. Nikolakopoulos and C. Papadopoulos, Aligned and Misaligned Wear Pattern in Fluid Film Bearings and Influence on the Rotor Response. 9th International Conference on Vibration in Rotating Machines SIRM 2011, Darmstadt, Germany (2011)

 

[C9] A. Chasalevris and C. Papadopoulos*, Nonlinear simulation of continuous rotor bearing systems with multi-step geometry and breathing cracks. 8th IFToMM – Conference on Rotor Dynamics, Seoul, Korea (2010)

 

[C8] A. Chasalevris* and C. Papadopoulos, Early Detection of Rotor Cracks by Measuring the Coupled Response under External Excitation. 8th IFToMM – Conference on Rotor Dynamics, Seoul, Korea (2010)

 

[C7] A. Chasalevris* and C. Papadopoulos, Crack identification of a continuously modeled rotor with internal damping mounted on nonlinear fluid film bearings. 9th International Conference on Computational Structures Technology CST 2008, Athens, Hellas, (2008)

 

[C6] A. Chasalevris*, P. Nikolakopoulos and C. Papadopoulos, A nonlinear, dynamic, continuous, damped model for rotor-bearing systems. 9th Int. Conference on Motion and Vibration Control MOVIC 2008, Munich, Germany (2008)

 

[C5] C. Papadopoulos*, A. Chasalevris and P. Nikolakopoulos, Cracked continuous rotors vibrating on nonlinear bearings – some aspects on future trends. IUTAM 2009 Symposium on Emerging Trends in Rotor Dynamics, Delhi, India, (2009)

 

[C4] P. Nikolakopoulos*, A. Chasalevris and C. Papadopoulos, Wear Identification in Rotor-Bearing Systems by Volumetric and Bearing Performance Characteristics Measurements. 9th International Conference on Computational Structures Technology CST 2008, Athens, Hellas, (2008)

 

[C3] K. Gertzos, P. Nikolakopoulos*, A. Chasalevris and C. Papadopoulos, Wear identification in continuously modeled rotor on worn nonlinear fluid film bearings. 9th International Conference on Computational Structures Technology CST 2008, Athens, Hellas, (2008)

 

[C2] K. Saridakis, A. Chasalevris, A. Dentsoras and C. Papadopoulos, Fusing Neural Networks, Genetic Algorithms and Fuzzy Logic for Diagnosis of Cracks in Shafts. Intelligent Production Machines and Systems-2nd I*PROMS Virtual International Conference 3-14 July 2006, (2006) pp. 332-337

 

[C1] A. Chasalevris* and C. Papadopoulos, Cross coupled bending vibrations of rotating shaft due to a transverse breathing crack. 7th IFToMM – Conference on Rotor Dynamics, Vienna, Austria (2006)
[P3] A. Chasalevris and F. Dohnal, Suppressing Vibrations of a Shaft on Sliding Bearings. US Patent App. 15/635.313

 

[P2] A. Chasalevris and F. Dohnal, Gleitlager mit dynamischer Spaltverstellung zur Reduktion der Schwingungen bei Resonanzdurchfahrt. (A journal bearing with variable geometry for the reduction of the vibration amplitude of the rotor during passage through resonance). European Patent Office 07.08.2013, Patent Number: EP 2 623 800 A1

 

[P1] A. Chasalevris and F. Dohnal, A journal bearing with variable geometry for the reduction of the vibration amplitude of the rotor during passage through resonance. International Patent Office 08.08.2013, International Patent Number: WO 2013/113590 A1
> Selected Internal Reports in GE Oil&Gas and ALSTOM Power:

 

[R19] A. Chasalevris, Damhead Creek Rotordynamics – Rotordynamic Assessment of 490MW Shaft Train. (2016)

 

[R18] P. Jenkins and A. Chasalevris, ThermaVisayas – Rotordynamic Assessment of 169MW Steam Turbine. (2015)

 

[R17] A. Chasalevris, Geothermal Steam Turbine GST55N – Rotordynamic Assessment (2015)

 

[R16] A. Chasalevris, Analytical Evaluation of the Dynamic Characteristics of the ALSTOM Bearings R1T and R2T (2015)

 

[R15] A. Chasalevris, Geared Reaction Turbine GRT25ME18FL – Rotordynamic Case Study for Longer Rotors (2015)

 

[R14] A. Chasalevris, Geared Reaction Turbine GRT35E22 (2016)

 

[R13] A. Chasalevris, Developed Methodology for Linear and Nonlinear Rotordynamics of Turbine-Generators (2016)

 

 

> Selected Internal Reports in BorgWarner Turbo Systems:

 

[R12] A. Chasalevris, B01-BV40 Rotordynamic Case Study – Variation of Parameters for Bearing Geometry. (2013)

 

[R11] A. Chasalevris, B02 Initial Case Study with Asymmetric Bearings and Max. Permissible Bearing Clearances. (2013)

 

[R10] A. Chasalevris, B01 VS45 TS37 Gen. 3 Rotordynamic Case Study for Bearing Clearances Variation. (2013)

 

[R9] A. Chasalevris, Investigation of the Use of Transfer Functions in Balancing of Turbosystems. (2014)

 

[R8] A. Chasalevris, K0-Rotordynamic Case Study. (2014)

 

[R7] A. Chasalevris, B03 (TW53 CW64) Case Study for Maximum and Minimum Permissible Bearing Clearances. (2014)

 

[R6] A. Chasalevris, K9K BV35 Euro6 – Rotordynamic Case Study for Bearing Clearances and Lubr. Viscosity. (2014)

 

[R5] A. Chasalevris, K9K/B01 BV30 Gen 3.2-Rotordynamic Case Study. (2014)

 

[R4] A. Chasalevris, Development of an Analytical Model for the nonlinear simulation of high speed systems. (2014)

 

[R3] A. Chasalevris, Nonlinear Dynamics and Stability of Turbosystems Using Analytical Methods. (2014)

 

[R2] A. Chasalevris, Analytical Models for the Simulation of Full Floating Ring Bearings with Finite Length. (2014)

 

[R1] A. Chasalevris, B03/BV35 Rotordynamic Simul. for Max. and Min. Permissible Bearing Clearances. (2014)

 

 

> Reports in Academy

 

[ΑR2] A. Chasalevris, Gleitlager mit dynamischer Spaltvertellung zur reduction der Schwingungen bei Resonanzdurchfahrt in rotierenden Maschinen. Report for BMWi-SIGNO Project. Darmstadt, Germany (2013)

 

[ΑR1] D. Sfyris and A. Chasalevris, An analytical solution of the Reynolds equation for the lubrication of the finite journal bearing and evaluation of the lubricant pressure. TU Darmstadt Prints (2012), Darmstadt, Germany. Available online at the German National Library http://nbn-resolving.de/urn/resolver.pl?urn=urn:nbn:de:tuda-tuprints-28795
[BC3] A. Chasalevris and F. Dohnal, “Construction and Experimental Application of a Varibale Geometry Journal Bearing (VGJB) for the Vibration Suppression of Rotors ”, Proceedings of the 9th IFToMM Internation Conference on Rotor Dynamics, Mechanisms and Machine Science © Springer International Publishing, 2014,pp. 943 - 954.

 

[BC2] C. Papadopoulos, A. Chasalevris, and P. Nikolakopoulos, “Cracked Continuous Rotors vibrating on Nonlinear Bearings ”, K. Gupta (ed.), IUTAM Symposium on Emerging Trends in Rotor Dynamics. IUTAM Book series 25, DOI 10.1007/978 – 94 – 007 – 0020 - 839, © Springer Science+Business Media B.V. 2011, pp.469 - 478.

 

[BC1] K. Saridakis, A. Chasalevris, A. Dentsoras and C. Papadopoulos, Fusing Neural Networks, Genetic Algorithms and Fuzzy Logic for Diagnosis of Cracks in Shafts. Intelligent Production Machines and Systems-2nd I*PROMS Virtual International Conference 3-14 July 2006, (2006) pp. 332-337

NEWS

  • Co-organizer of the Minisymposium Recent Advances in Rotor Dynamics

    Presentation of the paper 'Predictions on the Stability of Slender Rotors in Seismic Excitation Applying Hopf Bifurcation Theory'

    ICOVP 2019, 14th International Conference on Vibration Problems

    1-4 September 2019, Crete, Greece
  • Keynote Lecture on 'Chellenges in the Rotordynamic Design of Turbosystems and Turbines'

    Comadem 2019, 2nd International Congress and Exhibition on Condition Monitoring and Diagnostic Engineering Management

    3-5 September 2019, Huddersfield, United Kingdom
  • Presentation of the paper 'Applying Hopf Bifurcation Theory on the Stability Design of the Rotor-Bearing-Foundation Systems'

    12th HSTAM 2019, International Congress of Mechanics
    22-25 September 2019, Thessaloniki, Greece

CONTACT

Located in the Zografos Campus at the National Technical University of Athens