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Presentation Outline. IntroductionMachine Foundation Design CriteriaVibration Properties EvaluationGTSTRUDL Harmonic Analysis Examples of applicationSummary and Conclusions. Combined Cycle Power Plant. . Steam Turbine-Generator Machine. Machine Foundation Design Criteria. Deflection criteria: maintain turbine-generator alignment during machine operating conditions Dynamic criteria: ensure that no resonance condition is encountered during machine operating conditions Strength criteria: re29897
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1. Determination of Local Structural Vibration Properties for the Design of Machine Foundations Luis M. Moreschi, Ph.D. and Farhad Farzam, P.E.
Central Structures Group
Bechtel Power Corporation
GTSTRUDL Users Group
2003 Annual Meeting
2. Presentation Outline Introduction
Machine Foundation Design Criteria
Vibration Properties Evaluation
GTSTRUDL Harmonic Analysis
Examples of application
Summary and Conclusions
3. Combined Cycle Power Plant
4. Steam Turbine-Generator Machine
5. Machine Foundation Design Criteria Deflection criteria: maintain turbine-generator alignment during machine operating conditions
Dynamic criteria: ensure that no resonance condition is encountered during machine operating conditions
Strength criteria: reinforced concrete design
6. Vibration Properties Evaluation Identification of the foundation natural frequencies for the dominant modes
Frequency exclusion zones for the natural frequencies of the foundation system and individual structural members (±20%)
Eigenvalue analysis: natural frequencies, mode shapes, and mass participation factors
7. STG Pedestal Structure
8. STG Pedestal FE Model
9. Low Frequency Modes
10. High Frequency Modes
11. Local Vibration Modes Identification of natural frequencies for individual structural members
Quantification of changes on vibration properties due to foundation modifications
12. Simplified Approaches Beam models
13. GTSTRUDL Harmonic Analysis UNITS KIPS IN CYCLES SEC
HARMONIC LOADING 1001 ‘LONG BEAM FREQ'
JOINT LOAD SINE FREQ FROM 0.0 TO 100.0 AT 2.0
'JOINT-B3' FORCE Y AMPL 1.0 PHASE 0.0
END OF HARMONIC LOAD
LOAD LIST 1001
PERFORM HARMONIC ANALYSIS
COMPUTE HARMONIC DISPLACEMENTS
14. Harmonic Analysis Output
15. Member Frequencies
16. Summary and Conclusions Machine foundation design: need to identify the vibration properties of individual structural members
GT STRUDL Harmonic Analysis command provides a simple and efficient technique to perform the required calculations
Improvements:
Graphical post-processing for Harmonic Analysis results
Video file capabilities for mode shapes display
17. Questions? Central Structures Group
Bechtel Power Corporation
Frederick, Maryland In summary, we are a highly specialized technical team, we provide services to power projects all around the world and our main product consist of a set of drawings and calculations for the detailed design of….In summary, we are a highly specialized technical team, we provide services to power projects all around the world and our main product consist of a set of drawings and calculations for the detailed design of….