NASA Technical Reports Server (NTRS) : Improvement pdf

NASA Technical Reports Server (NTRS) : Improvement

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The method investigated in the current research work is based on the identification of the equations of motion during test flights, followed by the solution of these identified equations to numerically compute the flutter dynamic pressure. The current research work is aimed at overcoming two main difficulties which arise when: (1) A continuous system is truncated into a system with a finite number of degrees of freedom. (2) The desired range of frequencies is wide; in the latter case, numerical difficulties occur that can only partly be overcome by giving relatively more weight to the high frequency modes. Results pertaining to the above first point will be presented under section entitled ‘Truncation Effects’, and results pertaining to the above second point will be presented under section entitled ‘Frequency Range Effects’. The numerical example used herein consists of a continuous simply supported beam. It is further assumed that the object of the identification procedure is to identify the beam’s first seven modes

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 8/5/1993
• Year: 1993
• Book Topics/Themes: NASA Technical Reports Server (NTRS), DAMPING, DYNAMIC PRESSURE, EQUATIONS OF MOTION, FLIGHT TESTS, FLUTTER ANALYSIS, FREQUENCY RANGES, PARAMETER IDENTIFICATION, ERROR ANALYSIS, HIGH FREQUENCIES, LEAST SQUARES METHOD, MODES (STANDING WAVES), OPTIMIZATION, Nissim, E

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