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Lectures

8. Modeling of gear body stiffness

2023 - KISSsoft AG - Online (~200 participants)

Influence of the gear body geometry on basic gear calculations (Contact analysis, Load distribution factor). Video: English, Deutsch

7. Unbalance excitation calculations

2022 - KISSsoft - Onsite (~30 participants)

Basic concepts of unbalance excitations in rotordynamics. Academic and industrial examples and discussion of their analysis results.

6. Rotordynamics of shafts, bearings & annular pressure seals

2022 - KISSsoft - Onsite (~30 participants)

Explanation, analysis process and physics of rotordynamic phenomena of journal bearings (plain, prestressed, tilting pad) and annular seals. Explanation of cross coupling effects and influences.

5. Introduction to linear lateral rotordynamics with FEM

2022 - KISSsoft - Onsite (~30 participants)

Explanation of the fundamentals of lateral rotordynamics: FW/BW orbiting modes, gyroscopic effects, damped eigenfrequencies and modal damping. Discussion of basic FE concepts.

4. Non-linear lateral rotordynamics with FEM

2022 - ETH Zurich - Onsite (~20 participants)

Fundamentals of lateral rotordynamics: FW/BW orbiting modes, gyroscopic effects, damped eigenfrequencies, modal damping, annular pressure seals. Analysis of a multi-stage rotor (ANSYS).

3. Lateral & Torsional rotordynamics of pumps

2021 - SULZER - Online (~50 participants)
Weekly-4h seminar during the course of a month. 3x4h lateral rotordynamics, 1x4h torsional rotordynamics.

Lateral rotrdynamics: FW/BW orbiting modes, gyroscopic effects, stress-stiffening, annular pressure seals, radial bearings, impeller-casing interaction, mechanical and hydraulic unbalance, complex modal and harmonic response analysis, interpretation of API610, case studies.

Torsional rotordynamics: Modeling of rotor, coupling(s), gear(s), torsional excitation sources, modal and harmonic response analysis, fatigue assessment, simulation of transient torsional events.

2. Non-linear lateral rotordynamics with FEM

2021 - ETH Zurich - Onsite (~25 participants)
Discussion on lateral rotordynamics using a multistage pump rotor as an example. Analysis software: ANSYS.

Topics: FW/BW modes, gyroscopic effects, influence of hydrodynamic bearings and seals (non-linear rotordynamic effects), damped (complex) modal analysis (Campbell & Damping diagrams), harmonic response analysis, classification of stresses and stress evaluations.

1. Static structural simulation of pressure containers

2019 - ETH Zurich - Onsite (~25 participants)
Discussion on fundamental simulation concepts using a pressure vessel as an example. Analysis software: ANSYS.

Topics: symmetries (radial, cyclic), meshing techniques and options (boundary layer, etc.), non-linear contact methods (pure penalty, langrangian, etc.), material laws, model checking approaches, failure modes and evaluation criteria, submodeling techniques.

Articles

Assessment of fatigue load alleviation potential through blade trailing edge morphing
2016 - TORQUE conference - Munich
Article (PDF)
Benchmarking aerodynamic prediction of unsteady rotor aerodynamics of active flaps on wind turbine blades using ranging fidelity tools
2016 - TORQUE conference - Munich
Article (PDF)
Evaluation of the performance of a Navier-Stokes and a viscous-interaction solver in trailing edge flap simulations
2015 - EWEA conference - Paris
Article (PDF)

Contact

ttsiantas@delta-js.ch
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