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Determination of Local Structural Vibration Properties for the Design of Machine Foundations

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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Determination of Local Structural Vibration Properties for the Design of Machine Foundations

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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….

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