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Friday, August 7, 2020 | History

3 edition of Summary of AH-1G flight vibration data for validation of coupled rotor-fuselage analyses found in the catalog.

Summary of AH-1G flight vibration data for validation of coupled rotor-fuselage analyses

Summary of AH-1G flight vibration data for validation of coupled rotor-fuselage analyses

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Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • AH-1G helicopter.,
  • Evaluation.,
  • Flight tests.,
  • Rotor body interactions.,
  • Vibration tests.

  • Edition Notes

    StatementR.V. Dompka and J.D. Cronkhite.
    SeriesNASA contractor report -- 178160., NASA contractor report -- NASA CR-178160.
    ContributionsCronkhite, J. D., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL18082826M

    contained within the analysis data. At this point “I don’t know” is the best answer. A wrong diagnosis can cost greatly and can rapidly diminish the credibility of the machinery maintenance worker. Analysis of the problem by a vibration specialist is required. This guide is divided into two sections. Rotor System Health Monitoring Using Coupled Rotor-Fuselage Vibration Analysis Mao Yang, University of Maryland; Inderjit Chopra, University of Maryland; David J. Haas, Naval Surface Warfare Center May 2, Your Path: Home > Rotor System Health Monitoring Using Coupled Rotor-Fuselage Vibration Analysis.

    The ASCC requested a summary of vibration exposure levels at crew stations of currently fielded US Army helicopters. We excerpted these data from existing technical documents, condensed them into graphical form, and present them in eight figures. In addition to the summary data.   This video is unavailable. Watch Queue Queue. Watch Queue Queue.

    Flight Test t Vibratory Loads at High Speed: Prediction vs. Flight Data in • None of predictions agreed - 0 M AA SR SU SIN 4 COS 4 ΩΩΩΩt Ω Predicted cockpit vibration – knots with flight test data • No two predictions agreed with each other • LYNX Blades were not pressure instrumented, hence systematic. termine the potential for encountering such instabilities in flight. The measures used to ensure the prevention of these instabilities include predictive stability analyses 1 ground vibration tests (GVT), 2 open-and closed- loop flight control system tests, 3 and flight flutter tests. 4 A GVT measures the modal characteristics of a structure.


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Summary of AH-1G flight vibration data for validation of coupled rotor-fuselage analyses Download PDF EPUB FB2

Get this from a library. Summary of AH-1G flight vibration data for validation of coupled rotor-fuselage analyses. [R V Dompka; J D Cronkhite; Langley Research Center.].

m SUMMARY OF AH-1G FLIGHT VIBRATION DATA FOR VALIDATION OF COUPLED ROTOR-FUSELAG E ANALYSES -- (EASA-CB) SUMIBABY CF AH-1G FLIGHT N VIEBATION DAIA E08 VALICATICN CF COUPLED KCTOR-FUSELAGE ANALYSES Final Report ('Iextron Bell Helicopter) p CSCL 46E unclas G3/39 R.V.

Dompka and J.D. Cronkhite Bell Helkopterwm. Abstract. Under a NASA research program designated DAMVIBS (Design Analysis Methods for VIBrationS), four U.

helicopter industry participants (Bell Helicopter, Boeing Vertol, McDonnell Douglas Helicopter, and Sikorsky Aircraft) are to apply existing analytical methods for calculating coupled rotor-fuselage vibrations of the AH-1G helicopter for correlation with flight test data from an AH Author: R.

Dompka and J. Cronkhite. The AH-1G OLS flight test data was found to be well documented and provide a sound basis for evaluating currently existing analysis methods used for calculation of coupled rotor-fuselage. CORRELATION OF AH-1G AIRFRAME FLIGHT VIBRATION DATA WITH A COUPLED ROTOR-FUSELAGE ANALYSIS K.

Sangha and J. Shamie Analysis and Correlation Plan AH-1G Blade Structural Modeling AH-[G Aerodynamics Model Page 89 93 97 99 rotor.' airframe flight vibration levels for a helicopter in steady state forward flight. H. Yeo, A comprehensive vibration analysis of a coupled rotor/fuselage system, Ph.D.

Dissertation, University of Maryland at College Park (). R.V. Dompka and J.D. Cronkhite, Summary of AH-lG flight vibration data for validation of coupled rotor-fuselage analysis, NASA CR (October ). Interface & simulation framework for coupled rotor fuselage analysis and structural optimization.

Multibody representation of the UHA main rotor system. Only one of. Summary of AH-1G flight vibration data for validation of coupled rotor-fuselage analyses The AH-1G OLS flight test data was found to be well documented and provide a. Coupled Rotor-Fuselage Analysis with Finite Motions Using Component Mode Synthesis Journal of the American Helicopter Society, Vol.

49, No. 2 Vibration Prediction for Rotor System with Faults Using Coupled Rotor-Fuselage Model. A coupled rotor-fuselage vibration analysis is formulated to analyze the effect of rotor system faults on fuselage vibrations and rotor-blade displacements in both hover and forward-flight conditions.

“ The Vibration Characteristics of a Coupled Helicopter Rotor-Fuselage by a Finite Element Analysis,” NASA Technical PaperGoogle Scholar [32] Hohenmeser K.

H., “ The Role of Rotor Impedance in the Vibration Analysis of Rotorcraft,” NACA CR, Google Scholar. Vibration Prediction for Rotor System with Faults Using Coupled Rotor-Fuselage Model. Coupled rotor-fuselage dynamics and aeroelasticity in turning flight.

ANNE SPENCE and. Flight validation requirements for instrument flight procedures have grown substantially in recent years. Radiola’s experienced flight validation crews have completed validation missions in many parts of the world with more than procedures validated to date.

Flight validation is a highly specialised activity that ensures: instrument flight procedures meet the intended operational. Haas, Vibration prediction for rotor system with faults using coupled rotor-fuselage model, J. of Aircraft, 41 (2),[15] H. Yeo and W. J ohnson, Assessment of comprehensive analysis calculation of airloads on helicopter rotors, J.

of Aircraft, 42 (5), The DYMORE/KFLOW coupled analysis uses two different models: an isolated rotor model and a rotor–fuselage model. The coupled analysis results are correlated with both the measured data.

Flight Validation. Flight validation of instrument flight procedures has become an essential segment of flight inspection, as civil aviation is increasingly replacing the use of terrestrial NAVAIDS in favour of GNSS for en-route navigation (RNP) and, to a lesser degree for landing, where ILS will continue to be predominantly used.

A Shock and Vibration Environment Recorder, (SAVER™), model 9x30 with SaverXware programming software was used in this study. This data recorder was selected due to the necessity of being able to record vibration and altitude in order to separate in-flight data from ground data. So, the amplitudes of body vibration computed by complex CFD/FMBD method can be validated by free flight data.

Last but not least, since FWMAVs' take-off mass normally varies according to different requirements of missions [6], [7], the study on the relationship between vibration and take-off mass may provide a new way to suppress the.

Flight crews need to understand the causes and effects of airplane vibration so that they can take appropriate action to maintain flight safety and prevent excessive wear or airframe damage. In addition, flight crews can contribute to accurate reports of in-service events that will facilitate troubleshooting and maintenance activities.

Sikorsky Aircraft) are to apply existing company methods for coupled rotor-fuselage analysis to calculate vibrations of the AH-1G helicopter and to correlate with data available from an Operational Load Survey (OLS) flight test program (Refs.

1 'and 2). In support of this common activity, BHTI, the. the in-flight vibration environment benefits design and integration of experiments on the test bed. The power spectral density (PSD) of accelerometer flight data is analyzed to quantify the in-flight vibration environment from a frequency of 15 Hz to Hz.

These accelerometer data are analyzed for typical flight conditions and maneuvers.combined rotor-fuselage problem. RWF couples a time-stepping vortex lattice method for the rotor blade and wake system with a source panel fuselage model.

The other US code is a recent version of the Continuum Dynamics, Inc. Computation of Rotor Airloads in Forward flighT/Aeroacoustic Analysis (RotorCRAFT) code.

This code.An AH-1G test vehicle was utilized in this project to provide ground vibration data of realistic quality. Flight test data the AH-1G was obtained from another Army program on an as-available basis. The analytical testing examples in this report use AH-1G data to illustrate possible generic applications of the methodology.

The authors do not.