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Tuesday, August 4, 2020 | History

3 edition of NASTRAN forced vibration analysis of rotating cyclic structures found in the catalog.

NASTRAN forced vibration analysis of rotating cyclic structures

NASTRAN forced vibration analysis of rotating cyclic structures

  • 118 Want to read
  • 14 Currently reading

Published by National Aeronautics and Space Administration in [Washington, D.C.? .
Written in English

    Subjects:
  • NASTRAN,
  • Vibration (Aeronautics)

  • Edition Notes

    Statementby V. Elchuri, G.C.C. Smith, A. Michael Gallo
    SeriesNASA-CR -- 173821, NASA contractor report -- 173821
    ContributionsSmith, G. C. C, Gallo, A. Michael, United States. National Aeronautics and Space Administration, Niagara Frontier Operations (Bell Aerospace Textron)
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14928846M

      The matrix A is a unit skew-symmetric matrix in the plane of rotation; for example if rotation is positive about the Z axis then for a single node [0 A= 1 0 -1 01 x 0 0 y (10) 0 0 z The softening and Coriolis terms may be incorporated into a NASTRAN analysis by using the DMIG input (direct matrix input), which requires a (FORTRAN) pre. As a typical case of the engineering project, the wind vibration problem of Nanjing TV tower has been solved by using the AMD control system for the first time in China [78–79] [78] [79].Nanjing TV tower, height m, is located in the western suburbs of Nanjing city, the main structure is made up of three prestressed concrete hollow legs with rectangular section as shown in Fig.

      Omprakash and Ramamurti applied the principle of cyclic symmetry to the blisks together with the Ritz method and predicted its natural frequencies. Tomioka et al. investigated the free vibration of a disk–blade coupled system by the Ritz method. Boundary conditions and continuity conditions of the disk and blades were satisfied by introducing. Level to conduct forced vibration analysis cyclic structures rotating about their axis of sy~netry. The effects of Coriolis and centripetal accelerations together with those due to linear acceleration of the axis of rotation have been included.

    Vibration of Nearly Periodic Structures and Mistuned Bladed Rotors - by Alok Sinha June and Lombard, J.-P., , “ Dynamical Analysis of Multi-Stage Cyclic Structures,” Mechanics Research , “ The Maximum Factor by Which Forced Vibration of Blades Can Increase Due to Mistuning,” ASME Journal of Engineering for Gas. A capability for the nonlinear vibration analysis of beam and frame structures suitable for use with NASTRAN level is described. The nonlinearity considered is due to the presence of axial loads induced by longitudinal end restraints and lateral displacements that are large compared to .


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NASTRAN forced vibration analysis of rotating cyclic structures Download PDF EPUB FB2

Theoretical aspects of a new capability developed and implemented in NASTRAN Level to analyze forced vibration of a cyclic structure rotating about its axis of symmetry are presented. Fans, propellers, and bladed shrouded disks of turbomachines are some examples of such by: 5.

Get this from a library. NASTRAN forced vibration analysis of rotating cyclic structures. [V Elchuri; G C C Smith; A Michael Gallo; United States. National Aeronautics and Space Administration.; Niagara Frontier Operations (Bell Aerospace Textron)].

NASTRAN forced vibration analysis of rotating cyclic structures Theoretical aspects of a new capability developed and implemented in NASTRAN level to analyze forced vibration of a cyclic structure rotating about its axis of symmetry are presented.

Fans, propellers, and bladed shrouded discs of turbomachines are some examples of such structures. Get this from a library. Forced vibration analyses of rotating cyclic structures in NASTRAN. [V Elchuri; A Michael Gallo; S C Skalski; Lewis Research Center.; Bell Aerospace Textron.].

Abstract. Theoretical aspects of a new capability, developed and added to the general purpose finite element program NASTRAN Levelto conduct forced vibration analysis of turned cyclic structures rotating about their axis of symmetry, are : G.

Smith, A. Gallo and V. Elchuri. NASTRAN forced vibration analysis of rotating cyclic structures. By A. Gallo, V. Elchuri and G. Smith. Abstract. Theoretical aspects of a new capability developed and implemented in NASTRAN level to analyze forced vibration of a cyclic structure rotating about its axis of symmetry are presented.

Fans, propellers, and bladed. Get this from a library. Finite element forced vibration analysis of rotating cyclic structures. [V Elchuri; G C C Smith; Lewis Research Center.; Bell Aerospace Textron.]. package. Figure 5 presents a schematic flowchart of this forced vibration analysis capability for rotating cyclic structures.

Illustrative Example This example illustrates the out-of-plane displacement response of grid points 8 and 18 of the bladed disc of Figure 4, when the disc, rotating at. NASTRAN Forced Vibration Analysis of Rotating Cyclic Structures,” Joseph, J.

A.,“Cyclic Symmetry in MSC/NASTRAN,” MSC/NASTRAN Application Manual, Chap. The MacNeal-Schwendler Corporation, Mode Localization and Eigenvalue Loci Veering Phenomena in Disordered Structures,”.

Leissa, A. W., Lee, J. K., and Wang, A. "Rotating Blade Vibration Analysis Using Shells." Proceedings of the ASME International Gas Turbine Conference and. Stanford Libraries' official online search tool for books, media, journals, databases, government documents and more.

Forced vibration analyses of rotating cyclic structures in NASTRAN [microform] in SearchWorks catalog. NASTRAN Forced Vibration Analysis of Rotating Cyclic Structures J.

Vib., Acoust., Stress, and Reliab (April, ) A Nonclassical Vibration Analysis of a Multiple Rotating. A new capability was added to the general purpose finite element program NASTRAN Level to conduct forced vibration analysis of tuned cyclic structures rotating about their axis of symmetry.

The effects of Coriolis and centripetal accelerations together with those due to linear acceleration of the axis of rotation were included. Forced Vibration Analysis of Rotatin 9 Cyclic Structures (References 4,5) Cyclic structures rotating about their axis of symmetry, and subjected to sinusoidal or generally periodic loads moving with the structure.

A capability was added to the general purpose finite element program NASTRAN Level to conduct forced vibration analysis of tuned cyclic structures rotating about their axes of symmetry. The effects of Coriolis and centripetal accelerations together with those due to linear acceleration of the axis of rotation were included.

[5] Transient dynamic elastoplastic analysis by the dual reciprocity BEM D.P.N. Kontoni & D.E. Besko [6] Journal USA naval research hand book MILF f [7] V.

Elchuri, NASTRAN Forced Vibration Analysis of Rotating Cyclic Structures. Nearly, all published literature on the forced vibrations of mistuned blades disks considers harmonic, i.e., steady-state, vibrations, whereas the self-excited flutter vibrations are analyzed by the evaluation of the margin against instabilities by means of a modal, or rather than eigenvalue, analysis.

The transient forced response of mistuned. Dynamics of rotationally periodic structures. ELCHURI and G. SMITH Report No. NASA CIR Finite element forced vibration analysis of rotating cyclic structures. BALASUBRAMANIAN and V. RAMAMURTI Journal of Sound and VibrationFrequency analysis of centrifugal fan impellers.

A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Forced vibration of damped, single degree of freedom, linear spring mass systems.

Finally, we solve the most important vibration problems of all. In engineering practice, we are almost invariably interested in predicting the response of a structure or mechanical system to external forcing. Vibration Fatigue Analysis in N 4 GL, ML Vibration Fatigue Analysis It has been estimated from time to time that 75% of all machine and structural failures have been caused by some form of fatigue.

It was once thought that metal becomes brittle under the action of cyclic .In forced vibration the usual driving frequency in rotating machinery is the shaft speed or multiples of this speed. This speed becomes critical when the frequency of excitation is equal to one of the natural frequencies of the system.

H-S SHEN, X-L HUANG, in Analysis and Design of Plated Structures: Dynamics, Forced vibration.Part of the History of Mechanism and Machine Science book series (HMMS, volume 20) Gallo, A.M.: NASTRAN Forced Vibration Analysis of Rotating Cyclic Structures. J. Vib. Acoust. Stress Rel. Des., ASME() Google Scholar.

Ewins, D.J.: The Effects of Detuning upon Forced Vibrations of Bladed-Disks. Cyclic Micro-Slip under.