The objective of this work was to minimize the mass of a mechanism for locking aircraft landing gear doors whilst ensuring stresses did not exceed the material allowable stress. A typical metallic locking mechanism comprises a frame attached to the aircraft structure and supporting a number of linkages through pivot pins. These linkages transfer translational motion of a hydraulic actuator into rotation of a hook, which engages with the door. The structure was modelled with Abaqus/Standard as a non-linear static analysis involving contact, but with no material or geometric non-linearity. Existing commercial optimisation codes are available to perform Topology and Shape optimisation with Abaqus, however these require a non-linear Abaqus simulation to be performed for each design iteration. To achieve an optimized design in a shorter duration, the non-linear Abaqus model was coupled with an equivalent linear VR&D GENESIS analysis model, representing only the frame, using an interface developed by GRM Consulting Ltd. Shape optimisation studies were performed using this coupled approach to derive the optimum geometry for the frame. Whilst optimizing within GENESIS the Abaqus interface periodically executed a non-linear Abaqus simulation with updated geometry to maintain correlation between the two solvers. In conclusion, this coupled optimisation allowed a detailed design to be achieved in a significantly reduced timescale due the efficient application of optimisation technology, using only the minimum number of time-consuming, non-linear iterations.
Efficient shape optimisation of an aircraft landing gear door locking mechanism by coupling Abaqus to GENESIS
Effiziente Formoptimierung eines Verschlussmechanismus für ein Flugzeugfahrwerköffnungsklappe durch Kopplung von Abaqus mit GENESIS
2009
10 Seiten, 7 Bilder, 3 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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