NDLI: Nastran forced vibration analysis of rotating cyclic structures

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Nastran forced vibration analysis of rotating cyclic structures

Content Provider	NASA Technical Reports Server (NTRS)
Author	Elchuri, V. Smith, G. C. C. Gallo, A. M.
Copyright Year	1983
Description	Theoretical aspects of a new capability developed and implemented in NASTRAN level 17.7 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. The capability includes the effects of Coriolis and centripetal accelerations on the rotating structure which can be loaded with: (1) directly applied loads moving with the structure and (2) inertial loas due to the translational acceleration of the axis of rotation (''base' acceleration). Steady-state sinusoidal or general periodic loads are specified to represent: (1) the physical loads on various segments of the complete structure, or (2) the circumferential harmonic components of the loads in (1). The cyclic symmetry feature of the rotating structure is used in deriving and solving the equations of forced motion. Consequently, only one of the cyclic sectors is modelled and analyzed using finite elements, yielding substantial savings in the analysis cost. Results, however, are obtained for the entire structure. A tuned twelve bladed disc example is used to demonstrate the various features of the capability.
File Size	1692103
Page Count	31
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19840021183
Archival Resource Key	ark:/13960/t9n34pk32
Language	English
Publisher Date	1983-01-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Finite Element Method Forced Vibration Harmonic Excitation Structural Vibration Rotating Bodies Axes of Rotation Nastran Equations of Motion Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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