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Nonlinear flap-lag-extensional vibrations of rotating, pretwisted, preconed beams including coriolis effects
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Subrahmanyam, K. B. Kaza, K. R. V. |
| Copyright Year | 1985 |
| Description | The effects of pretwist, precone, setting angle, Coriolis forces and second degree geometric nonlinearities on the natural frequencies, steady state deflections and mode shapes of rotating, torsionally rigid, cantilevered beams were studied. The governing coupled equations of flap lag extensional motion are derived including the effects of large precone and retaining geometric nonlinearities up to second degree. The Galerkin method, with nonrotating normal modes, is used for the solution of both steady state nonlinear equations and linear perturbation equations. Parametric indicating the individual and collective effects of pretwist, precone, Coriolis forces and second degree geometric nonlinearities on the steady state deflection, natural frequencies and mode shapes of rotating blades are presented. It is indicated that the second degree geometric nonlinear terms, which vanish for zero precone, can produce frequency changes of engineering significance. Further confirmation of the validity of including those generated by MSC NASTRAN. It is indicated that the linear and nonlinear Coriolis effects must be included in analyzing thick blades. The Coriolis effects are significant on the first flatwise and the first edgewise modes. |
| File Size | 1688714 |
| Page Count | 35 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850026114 |
| Archival Resource Key | ark:/13960/t7sn52q30 |
| Language | English |
| Publisher Date | 1985-01-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Nonlinear Equations Vibration Rotating Bodies Cantilever Beams Rotation Steady State Prestressing Bending Moments Rotating Environments Computer Techniques Differential Equations Coupled Modes Galerkin Method Nastran Coriolis Effect Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
