Transactions of Nanjing University of Aeronautics & Astronautics
Mechanical Behavior of Bistable Bump Surface for Morphing Inlet
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Abstract:
There exists inletengine match conflict between high and low speeds for a nonadjustable bump inlet. A scheme of using a bistable bump surface at the throat region of the inlet is proposed to adjust the throat area. The FEM model of the bistable surface is established with hinged constraint, and the bistability condition and structural transition process are investigated in detail. Moreover, the effects of loading method, loading position and structural parameters on critical driving force, input energy and structural strain are studied. Finally, the influences of an elastic boundary condition on the structural bistability are discussed. The results show that the bistability of the adjustable bump surface requires a certain boundary constraint and geometric parameter combination,and that there are local and overall snapthrough phenomena during transition which are related to the loading position and structural parameters. Therefore, suitable loading position and structural material could reduce input energy and meet the demand of structural strain.
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