Blade Mechanics Seminar
23rd Blade Mechanics Seminar - 2018
Tuesday, September 11, 2018 - ZHAW Winterthur Eulachpassage, TN E0.58, Technikumstrasse 71, 8400 Winterthur
After another successful and well attended seminar, the ZHAW Zurich University of Applied Sciences is about to organize the 23rd Blade Mechanics Seminar. It will be held in a similar theoretical and practical framework with a variety of interesting topics.
The unchanged key target is to offer a platform for know-how and experience exchange among engineers from various turbomachinery companies. The Blade Mechanics Seminar aims to answer the participants needs coming from their daily work on axial and radial bladed discs of aero- and heavy-duty engines. All presentations will be given in common engineering terms by using comprehensible mathematics.
A printable version of the programme including further information of the 23rd Blade Mechanics Seminar will be published soon.
|08.00 h||Registration with Welcome Coffee & Croissants|
|08.30 h||Address of Welcome|
|09.30 h||Session 1: Lifing of Turbine Blades|
|10.00h||Session 2: Forced Response - Mistuning and Damping|
|10.30 h||Coffee Break|
|11.00 h||Session 2 continued: Forced Response - Mistuning and Damping|
|13.45 h||Session 3: Forced Response – Aerodynamic Excitation & Damping|
|15.15 h||Coffee Break|
|15.45 h||Session 4: Experimental Blade Vibration Analysis Methods|
|16.45 h||Closing Remark|
|Address of Welcome||Prof. Dr. Jürg Meier||Zurich University of Applied Sciences|
|Keynote presentation: Development of a Creep-Fatigue Lifing Strategy and Small Punch Creep Testing Technique for Gas Turbine Hot Gas Path Components||Dr. Erica Vacchieri||Ansaldo Energia, Italy|
Session 1: Lifing of Turbine Blades
|Modelling of Compressor Blade Behaviour under Tip Rubbing Conditions||Grzegorz Moneta||Ansaldo Energia, Switzerland|
Session 2: Forced Response - Mistuning and Damping
|Reduction of the Maximum Response Amplitude through Mode Localization||Sebastian Willeke||Leibniz University Hannover, Germany|
|An Overview of Reduced Order Modelling Techniques for Dynamic Analysis of Jointed Structures with Localized Nonlinearities due to the Contact Friction||Dr. Jie Yuan||Imperial College London, UK|
|Convenient Choice of Friction Test Parameters for Simulation of Turbine Blade Contacts||Thomas Hoffmann||Leibniz University Hannover, Germany|
|In Quest for the Best Performance Dampers||Dr. Chiara Gastaldi & Prof. Dr. Muzio M. Gola||Politecnico di Torino, Italy|
Session 3: Forced Response – Aerodynamic Excitation & Damping
|Numerical and Experimental Study on the Influence of Inlet Distortion on the Aeroelastic and Aerodynamic Performances of a Low Pressure Turbine||Loris Simonassi||Graz University of Technology, Austria|
|Numerical and Experimental FSI-Study to Determine Mechanical Stress Induced by Rotating Stall in Open Impellers of Centrifugal Compressors||Yves Bidaut||MAN Diesel & Turbo Schweiz AG, Switzerland|
|Influence of Intrarow Interaction on the Aerodynamic Damping of an Axial Turbine Stage||Tobias R. Mueller||University of Stuttgart, Germany|
Session 4: Experimental Blade Vibration Analysis Methods
|Development of a Finite Element Model Simulator for Blade Tip Timing Data Generation||Mohamed Mohamed||University of Manchester, UK|
|Determination of Blade Vibration by Blade Tip-Timing Sensor Waveform Analysis||Daniel Heller||Imperial College London & Rolls-Royce VUTC, UK|
The Blade Mechanics Seminar focusses on the structural mechanics of bladed discs and the interaction of turbomachinery blades with their working medium. This includes modelling and design methodologies based on analytical, numerical and experimental approaches that improve reliable operation of bladed discs. In this context, also monitoring and diagnostics are of interest in the seminar. Key aspects of fluid dynamics, acoustics and thermodynamics that contribute to the definition of realistic blade boundary conditions constitute a further focus in the seminar. In 2018, the main topics of the Blade Mechanics Seminar are related to:
Numerical and experimental vibration analyses
- Tuned and mistuned bladed discs
- Non-linear blade vibrations including friction and damping
Static and dynamic simulations
- Fluid-structure interaction (flutter and forced vibration)
- Stress analysis and optimization of static and transient thermo-mechanical problems
- Contact and material non-linearities
- Novel FE modelling techniques (sub-modelling, super-elements, boundary elements, etc.)
- Experimental mechanics and measuring methods (tip timing, strain-gauges, etc.)
- Imaging techniques (3D scanning, non-destructive testing, Computer Tomography, etc.)
- Creep, fatigue and creep-fatigue lifetime prediction
- Thermo-mechanical fatigue (TMF) mechanisms and testing
- Remaining Useful Life (RUL) assessment
Dr. Erica Vacchieri, Materials Specialist, Ansaldo Energia s.p.a., Italy, will give the keynote presentation on:
Development of a creep-fatigue lifing strategy and small punch creep testing technique for gas turbine hot gas path components
The requirements of the energy market are driven by an increased flexibility due to the actual economic climate and the tendency for discontinuous use of conventional resources in favour of renewable energies. Their flexibility makes Gas Turbines (GT) the main source of electrical power in this highly intermittent energy market. This makes, however, great demands on the fatigue resistance of hot gas path blades and vanes (HGPB&Vs) and in particular on their ability to withstand the interaction of fatigue, creep and environmental damage. While these effects reduce the expected life, maintenance intervals and reparability of these components, continuous cost reduction initiatives for more competitive maintenance plans oblige GT OEMs to extend the life of these critically loaded components. An understanding of the behaviour of the critical parts in this environment is therefore key for GT OEMs to quantify residual component life after service and to rejuvenate HGPBs.
A new creep-fatigue design methodology has been developed for GT blades and vanes of two Ni based superalloys. This includes the definition of an advanced constitutive model able to characterise the critical locations and conditions in HGPB&Vs by FE simulation. Creep-fatigue experiments have then been designed that reproduce the service conditions in critical locations to understand and better describe the respective damage mechanisms. The effectiveness of the methodology has been verified using service-like Thermo-Mechanical Fatigue (TMF) benchmark tests that simulate the situation at critical locations of HGPB&Vs. Two case studies will be presented for which the new procedure has been applied. These results will be underpinned by available field feedback to validate the lifing method.
The assessment of operated components has been conducted not only through microstructural evaluation but also through a miniaturised testing technique that allows the sampling of material from real critical locations. Small punch creep testing has been evaluated for Ni based superalloys and applied for the determination of the residual creep life of critical HGPB&Vs after operation.
Finally, this testing technique has been exploited for the quantification of material recovery in SX blades as obtained through a newly developed rejuvenation heat-treatment process. Thereby, various components after service have been considered with different operating regimes.
Registration / Abstract Submission
CHF 200 (approx. 170 Euro) for early birds until August 19, 2018
CHF 230 (approx. 195 Euro) after August 19, 2018
The registration fee includes all sessions, costs for meals (lunch and coffee breaks) and proceedings.
Two employees of the seminar sponsors participate in the Blade Mechanics Seminar free of charge.
For sponsoring opportunities, please get in touch with the Seminar Office.
No more abstracts can be accepted.
After acceptance of the proposed topic by the seminar organizers, the presenter also needs to send in a 20-minute PowerPoint presentation, which must be cleared for publication. Every presentation will be distributed with the seminar proceedings.
Seminar Information at a glance
- Seminar Date (Morning & Afternoon sessions):
Tue, September 11, 2018
- Deadline for reduced participation fee:
Sun, August 19, 2018
- Deadline for abstract submission (up to 100 words):
Abstracts are still welcome!
- Notification of Acceptance of Presentation:
End of June 2018
- Publication of Seminar Agenda:
- Deadline for presentation submission:
Sun, August 19, 2018
Length of presentation: Up to 20 minutes
ZHAW Zurich University of Applied Sciences, Eulachpassage, TN E0.58Technikumstrasse 71, 8400 Winterthur, Switzerland
The conference venue is situated at a walking distance of 450 metres from the station.
Travel to ZHAW, Winterthur
The trains run as often as every 15 to 20 minutes from Zurich Airport and Zurich City and take about 15 minutes to arrive in Winterthur.
From the main railway-station, the seminar location can be reached within a walking distance of less than 5 minutes.
Parking is available at the Lagerhausstrasse next to the building TS which is connected to the building TN, where the seminar takes place.
ZHAW Zurich University of Applied Sciences
IMES Institute of Mechanical Systems
The IMES Institute of Mechanical Systems at the ZHAW School of Engineering deals intensively with questions of structural mechanics in the fields applied mechanics, biomechanical engineering and lightweight structures.
The section applied mechanics focusses on the analytical and experimental simulation of non-linear mechanical behaviour for the mechanical design of highly loaded components such as turbomachinery blades. Our expertise includes aspects like non-linear material behaviour, damage, thermo-mechanical loading, contacts as well as vibration and damping. Together with our partners from industry, we make a significant contribution to new design processes and products within applied research and development.