Nonlinear Aspects of Aerospace Structures at High Excitation Levels Flat Aluminum Beams and Plates Studied.

摘要

Nonlinear multimodal response of flat aluminium clamped beams and plates was studied theoretically and experimentally together with associated signal processing effects. Theoretical models were evaluated to determine the various methods investigated and which methods might yield new information if further development with specific applications were pursued. The test methods and transducer suitability were carefully scrutinized. Beam tests were performed with sinusoidal and random excitation using a coil-magnet exciter. Clamped flat plate tests were performed using high intensity acoustic excitation from low levels to high levels. Data processing and analysis were investigated to determine their suitability. The hard spring nonlinearity or jump phenomena was apparent from the beam test results. The beam and plate were instrumented to separate the bending and axial components from the total strain. Displacement shapes of the beam were completed. The beam tests and the acoustic tests with the plate have been completed.