Zurich Universities of Applied Sciences and Art www.zhaw.ch

16th Blade Mechanics Seminar

Wednesday, September 14, 2011 8:15 – 17:10 h, Winterthur (Switzerland)Zurich University of Applied Sciences

In co-operation with

Aim/Keynote

Goals and Motivation After another successful and well attended seminar last year, the ZHAW Zurich University of Applied Sci-ences is about to organize the 16th Blade Mechanics Seminar. It will be given on 14th September 2011 in a similar theoretical and practical framework and a variety of interesting topics as the previous conferences.

At this year Blade Mechanics Seminar Prof. Dr.-Ing. Rainer Nordmann - Manager of Critical Technology Ro-tordynamics Alstom Power, Baden, Switzerland - will give the keynote presentation on: „Impact of Rotor-dynamics on Blade Vibrations - Guideline and Practice“.

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 participant‘s 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.

Keynote Presentation

Dr.-Ing. Thomas Krueger - Group Head for Tools & Methods Alstom Power, Baden, Switzerland

„Impact of Rotordynamics on Blade Vibrations – Guidelines and Practice”.

In all cases of new developments for steam and gas turbines, a rotordynamic assessment is required during the product development process. Usually the complete shaft line has to be considered in such investigations, particularly the different rotors (gas and/or steam turbines and the generator), the bearings, the couplings and other important components influencing the rotordynamic behavior.

The numerical investigations are subdivided into the lateral and the torsional rotordynamics. They include for both cases the determination of the natural frequencies and the corresponding mode shapes. In addition the forced vibrations have to be considered, mainly the unbalance response for the lateral vibrations and in case of the torsional vibrations a response due to harmonic air gap torques within the generator and the vibrations following an electrical fault (short circuit and faulty synchronization).

Besides the components as described before the blades of the turbine and the compressor influence the ro-tordynamic behavior as well. If the blade dynamics does not interfere strongly to the rotordynamics frequency range, it is sufficient when the masses and the moments of inertia are added to inertia parts of the rotor. Howe-ver if the dynamic interaction between the blades and the corresponding rotor cannot be neglected, the blades have to be included in the rotordynamic assessment of both the lateral and the torsional vibrations.

This lecture will describe, how this interaction has to be considered, which blade stages should be considered, how the blades have to be modeled and attached to the rotor. The frequency dependence of the blade natural frequencies has also to be taken into consideration.Examples will be presented and the effect of the Blade-Rotor-Interaction will be demonstrated and discussed in detail.

Programme

07.45

08.15

08.20

09.20

09.50

10.20

10.50

11.20

11.50

12.20

13.40

14.10

14.40

15.10

15.40

16.10

16.40

17.10

Registration with welcome coffee & croissants

Address of welcome

Keynote presentation:Impact of Rotordynamics on Blade Vibrations - Guidelines and Practices

Session 1 - Integrated Blade-Rotor Solutions

Full Rotortrain Modelling Approach for Assessment of Dynamic Stresses on Rotor and Blades due to Torsional Disturbances

Response Surface Based Multi Criteria Optimization of Turbine Wheels Fir-Tree Attachments

Coffee break & Exhibition of Seminar Sponsors

Session 2: Vibration Analyses of Shrouded Blades

Effects of Shrouded Blade Rings Assembly Procedure on Blade Coupling Conditions

Natural Frequencies of Shrouded Blade Rows: Sensitivity to the Shroud Contact Conditions

Dynamic Tests of Shrouded Blade Rows: Test Rig Design, Simulation Results and First Test Results

Lunch & Lunch Sessions of Seminar Sponsors

Session 3: Vibrations of Mistuned Bladed Discs

Direct Parametric Analysis of the Forced Response of Bladed Disks with Friction Interfaces Using Analytical Contact Models

Vibration Response of Coupled Blades with Detuning

Alternate Mistuning of Gas Turbine Blades Coupled by Underplatform Dampers

Coffee break & Exhibition of Seminar Sponsors

Session 4: Experimental Blade Analysis

Determination of Natural Frequencies from Blade Tip Timing Measurement Based on LMS Me-thod

Session 5: Mechanisms of Blade Excitation

Aeroelasticity at Reversed Flow Conditions During Compressor Surge

Determination of Crack Initiation on L-1 LP Steam Turbine Blades

Seminar End

Jürg Meier, Jaroslaw Szwedowicz

Thomas Krueger, Alstom Power, Switzerland

Igor Tsypkaykine, Alstom Power, Switzerland

Alexis Berranger, Toulouse University & Turbomeca, France

Jan Hlous, Skoda Power, Czech Republic

Simone Bistolfi, Franco Tosi Meccanica, Italy

Giacomo Mondellini, Franco Tosi Meccanica, Italy

Malte Krack, Leibniz University Hannover & SIEMENS, Germany

Hans R. Graf, Sulzer Innotec, Switzerland

Sebastian Tatzko, Leibniz University Hannover, Germany

Zdenek Kubin, West Bohemia University & Skoda Power, Czech Republic

Harald Schoenenborn, MTU Aero Engines GmbH, Germany

Josef Kellner, Skoda Power, Czech Republic

General Information

Attention: New Conference Venue!!Technopark, Conference Hall, Jägerstr. 2, Entrance C, 8406 Winterthur The conference venue is situated at a walking distance of 500 metres from the station.The trains run as often as every 15 to 20 minutes from Zurich Airport and take about 15 minutes to arrive in Winterthur.

Costs and Closing Date The participation fee amounts to CHF 180 for registrations until August 26, 2011 or CHF 210 for registrations after this date. This payment includes also documents (proceedings on CD) and meals.

Registration Please register online at: www.imes.zhaw.ch/blade-mechanics-seminar

Hotel InformationFor special hotel rates for participants at the Blade Mechanics Seminar please see: www.imes.zhaw.ch/blade-mechanics-seminar

Organizer University of Applied Sciences (ZHAW) in Winterthur, in co-operation with the Swiss Section of ASME

Prof. Dr Jürg Meier Dr. Jaroslaw Szwedowicz Nicole Schuwey, Seminar Head of Institute of Member of the Board Office, Institute ofMechanical Systems Swiss Section of ASME Mechanical Systems

ZHAW Zurich University ALSTOM (Switzerland) ZHAW Zurich University of Applied Sciences of Applied Sciences

+41 (0) 58 934 72 27 +41 (0) 56 205 48 80 +41 (0) 58 934 67 95mrjg@zhaw.ch jaroslaw.szwedowicz@ seyo@zhaw.ch power.alstom.com

Further Information/Abstracts For abstracts of the presentations and further information please contact our webpage: www.imes.zhaw.ch/blade-mechanics-seminar

Sulzer Turbo Machinery Technology DayWe offer this event in coordination with Sulzer Innotec organizing the one-day Sulzer Turbo Machinery Techno-logy Day, which takes place in Winterthur on 15th September 2011. This event is open for all working in the field of Turbo Machinery. The purpose of the event is to give an overview of the Sulzer activities and services in Turbo Machi-nery and mainly to offer a platform to exchange information and experience among experts in Turbo Machinery within Sulzer and beyond. The two events are organized on successive days in order to enable the participants to attend both events without additional travelling.

For information about the Sulzer Turbo Machinery Technology Day please see: www.sulzerinnotec.com/technology-day