Last edited by Goltigal
Friday, July 24, 2020 | History

3 edition of Turbomachinery Forced Response Prediction System (FREPS) found in the catalog.

Turbomachinery Forced Response Prediction System (FREPS)

Turbomachinery Forced Response Prediction System (FREPS)

user"s manual

  • 223 Want to read
  • 10 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Structural design.

  • Edition Notes

    StatementM.R. Morel and D.V. Murthy.
    SeriesNASA contractor report -- 194465., NASA contractor report -- NASA CR-194465.
    ContributionsMurthy, Durbha V., 1960-, United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17681860M

    Prediction of Flutter and Inlet Distortion Driven Response of a Transonic Fan Rotor Using Phase-Lagged Boundary Conditions Forced Response of Turbine Engine Bladed Disks and Sensitivity to Harmonic Mistuning. J. A Reduced Order Modeling Techniques for Dynamic Analysis of Mistuned Multi-Stage Turbomachinery Rotors. Ronnie Bladh, Matthew. The paper considers the finite element analysis of the free, undamped and the forced damped vibrations of rotationally periodic structures. Associated with every natural frequency (except for those for which the deflection is the same at corresponding points on every substructure) there are a pair of orthogonal mode shapes, with eigenvectors {u} and {ü}.

    Mechanical Engineering and Materials Science People. The Inner Workings of Axial Casing Grooves in a One and a Half Stage Axial Compressor With a Large Rotor Tip Gap: Changes in Stall Margin and Efficiency.

    NUMECA's NLH unique technology is now fully coupled with the modal approach, a very efficient fluid structure interaction prediction method covering cold-to-hot, forced response and flutter analysis, available with FINE™/Turbo and FINE™/Open with OpenLabs™. Save one to two orders of magnitude compared to standard FSI methods. It is known that small differences between nominally identical turbomachine blades, known as mistuning, can lead to significant variation in their vibration response levels. A commonly used term in mistuning studies called the “amplification factor” is clearly defined in this paper, and the high sensitivity of high-cycle-fatigue-related Cited by:


Share this book
You might also like
Circulation system selection manual for college and university libraries.

Circulation system selection manual for college and university libraries.

Dresden Gallery: modern masters

Dresden Gallery: modern masters

River of light

River of light

Todays medicine, tomorows science

Todays medicine, tomorows science

Work-related further education

Work-related further education

Hammer

Hammer

The Quiet Eye

The Quiet Eye

Employee benefit plans

Employee benefit plans

life of Admiral Collingwood.

life of Admiral Collingwood.

Looking where you intend to go

Looking where you intend to go

Hydroxyurea for the treatment of sickle cell disease

Hydroxyurea for the treatment of sickle cell disease

Netanyahu

Netanyahu

A demographic and social hygienic study on the inhabitants in Cheju Island, Korea

A demographic and social hygienic study on the inhabitants in Cheju Island, Korea

Turbomachinery Forced Response Prediction System (FREPS) Download PDF EPUB FB2

Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study.

The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied. A blade forced response prediction system has been developed using an implicit two-dimensional CFD solver to model the rotor blade forced response due to the static pressure distortion (potential disturbance) from the downstream stator vanes and vintage-memorabilia.com by: 7.

Turbomachinery shrouded rotor blade design has been widely used in fans, compressors, and turbines. By using either tip or mid-span shroud, the blade structural damping and natural frequencies can be increased to reduce flutter or forced response vintage-memorabilia.com by: 1.

An Integrated Nonlinear Approach for Turbomachinery Forced Response Prediction. Part II: Case Studies Article in Journal of Fluids and Structures 14(1) · January with 81 Reads.

This "Cited by" count includes citations to the following articles in Scholar. An integrated nonlinear approach for turbomachinery forced response prediction. Part I: Formulation. AI Sayma, M Vahdati, M Imregun. The system can't perform the operation now.

Try again later. Sensitivity Analysis for Forced Response in Turbomachinery using an adjoint Harmonic Balance Method Conference Paper · June with 31 Reads How we measure 'reads'. Crossings occurring at low speed get a lower force than at high speed. The system damping used is a constant critical damping ratio.

Using a modal force and damping along with the FE model forced response amplitude can be directly computed at resonance crossings inside operating vintage-memorabilia.com by: 2.

The computed unsteady aerodynamics are verified by comparison with rig measurements. A forced response analysis based on the principle of superposition is conducted, similar to the current practice in turbomachinery design. For reference, a fully coupled simulation of Cited by: 6.

We are adept at performing the entire range of structural integrity simulations that the turbomachinery industry demands - Steady state and Transient thermal analysis, Thermo-mechanical stress analysis, Elasto-plastic simulations, Sealing analysis, Natural frequency assessments and forced response simulations, High Cycle Fatigue (HCF) and Low.

The following work aims at the prediction of real mistuned blisk vibrations under consideration of fluid-structure-interaction (FSI). Aiming at the prediction of the forced response of a future rig test, three different computational models are applied for that purpose. Firstly, a finite element model is.

A numerical method has been developed to study the effects of structural mistuning on the aeroelastic behavior of turbomachinery cascades. The approach used is the combination of a modal reduction Cited by: 5.

Application of the Wilshire Stress-Rupture and Minimum-Creep-Strain-Rate Prediction Models for Alloy P91 in Tube, Plate and Pipe Form Non-Parametric Squeeze Film Damper Bearing Inverse Model Based on Artificial Neural Networks Applied to a Rotor-Casing System Running on Unsupported SFDs.

Sergio G Forced Response Analysis of a Radial. Forced Response of a Centrifugal Compressor Stage due to the Impeller-Diffuser Interaction. Unsteady Flows in Turbomachinery. Zonal Detached-Eddy Simulation Approach vs.

URANS for the Prediction of the Flow Field Through a Low Pressure Vane Located Downstream of. Stanford Libraries' official online search tool for books, media, journals, databases, government documents and more.

Day One. Rigorous demands of turbo-machines Introduction, Differentiating turbo-machinery types, Weight restrictions of turbine engine for aviation application, Steam and gas turbines for electric power, Planetary gears for helicopter engine, Aero-derivative engine for offshore petroleum platform, Environment and fish-friendly hydraulic turbine, Enhancing power capacity of wind turbine.

Response Prediction of Frictionally Constraint Blade Systems Based on a Variable Normal Load Microslip Model. (With Turbomachinery Committee) A New Reduced Order Modeling for Stability and Forced Response Analysis of Aero-Coupled Blades Considering Various Mode Families. An Acoustic Travelling Wave System for the Analysis of Blisk Mistuning.

Joshua J. Grant, Mitchell R. Cosmo, A Mistuned Forced Response Analysis of an Embedded Compressor Blisk Using a Reduced Order Model.

Application of the Modal Approach for Prediction of Forced Response Amplitudes for Fan Blades. Franziska Eichner, Joachim Belz. Forced Response Prediction to Turbomachinery Blade Rows in a Multistage Environment.

RSAF External Funding. June ASME-IGTI Conference, Paper no: GT ("Turbomachinery CFD and Design System"),Book Chapter 10 on Microfluidics and BioMEMS Applications.

Ensuring that the total system damping is positive over the entire turbine operating envelope for all modes is of utmost importance in any design since flutter in a turbine often causes blade failures. Calculation of the Unsteady Flow in Turbomachinery Using the Linearized Euler Equations Linearized Euler Prediction of Unsteady Cited by: 4.

Turbomachinery–alternator–compressor typical of Sandia and Integrated System Test loops (Wright et al., ). “The high operating speed prohibits the use of dry gas seals or other seal technologies which would provide the ability to fully seal the rotating shaft, therefore, all components on the shaft are within the pressure boundary.

This is the first comprehensive volume on nearly periodic structures and mistuned blade vibration. Alok Sinha presents fundamental concepts and state-of-the-art techniques in the analysis of free and forced response of a nearly periodic structure, weaving together his own work (covering thirty-five years of research in this field) with works by other vintage-memorabilia.com by: 4.The authors provide an illuminating discussion of the Wachel model and its current variations with comparisons to their CFD approach.

They mentioned Gupta’s MS thesis [6], but apparently overlooked the more accessible work by Gupta and Childs who use a bulk-flow model to predict the forces for the front and back compressor shroud faces and compared their predictions to Wachel’s vintage-memorabilia.com: Dara Childs.This approach albeit fast does not help to gauge the importance of individual effects on system response.

Presently, an orbit analysis method estimates force coefficients from numerical simulations of specified journal motions and predicted fluid film reaction forces.

Nonlinear Prediction of Rotordynamic Coefficients for a Hydrodynamic Cited by: 7.